Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon.

Ceylon cinnamon, which was regarded as a luxury spice during ancient times, has been consumed for its medicinal properties and health benefits for thousands of years. For centuries, Arabian traders controlled the European cinnamon trade through limited supplies from a country which they did not reveal. Content marketing analysis and chemical profiling of value-added products of Ceylon cinnamon in the global marketplace are proposed to investigate the clean status of the product labels. In the present study, a mixed-method approach was employed to investigate the labels of 6 types of value-added forms of cinnamon; i.e. quills, powder, tea, breakfast cereals, confectionery and bakery and nutraceuticals which are used in USA, UK, Mexico, Japan and products of Sri Lankan cinnamon exporters. Two hundred and seventy-six labels were analyzed to find out the aspects of clean status, transparency and authenticity. Key label claims of the cinnamon products lie within the bounds of cleaner, healthy, nutritional and sustainable attributes. Consumer perception lies within ingredients, nutritional value, country of origin and claim on safety and quality standards and certification. The value chain transparency, ethical rules (species mislabeling), and chemical profile of the pharmaceutical, confectionery and fragrance industry inputs were ignored. The best claim and competitive advantage of the Ceylon cinnamon; an ultra-low level (<0.01 mg/g Dry Weight) of Coumarin, were rarely indicated in labels. Lack of clean labels and traceability lagged Ceylon cinnamon in the 40 international markets while Cassia cinnamon (Coumarin content 2.23 mg/g DW), a major competitor of Ceylon cinnamon appears in the market with dirty labels. Millennials and upper-middle-class female consumers in their active ages, place a high demand on Ceylon cinnamon. Today's tech-savvy global consumers of Ceylon cinnamon use market intelligence frequently for identifying product authenticity. Well equipped clean labels were found to be demanded by the modern cinnamon consumers.

Introduction

Cinnamon has been one of the oldest, most popular and expensive baking spices in many cultures for centuries. Cinnamon trade of Sri Lanka dates back to the 14th century AD and a formal trade agreement between the Dutch Government and the King of Ceylon in 1766. Growing demand for healthy food products has led to an upsurge in the demand for cinnamon in the North American and European markets. Attributed mainly to its various anti-fungal, anti-viral, anti-carcinogenic and anti-bacterial properties, cinnamon is commonly used in the manufacture of food (confectionery and bakery), beverage, medicine (pharmaceutical and nutraceutical) and cosmetics which are witnessing significant positive demand. Moreover, global demand for natural food and beverages without jeopardizing shelf life, nutritional quality and taste are increasing positively [1]. Global food and beverage manufacturers have identified cinnamon; traditional additive and preservative, as the best replacement against artificial ingredients. Cinnamon has been recognized as a commercially available natural sweetener, flavouring agent, additive and preservative. Antioxidant, antifungal and antibacterial properties of cinnamon inhibit the deterioration of food and act as a natural food preservative. The mechanism of decreasing the DNA binding activity of the quorum sensing response regulator of LuxR grounds to the above properties claimed by the cinnamon [2]. Eugenol, which is the major component of cinnamon leaf oil, is a registered food additive that enhances flavour, especially on herbal products [3]. Linalool and β-Caryophyllene are registered as direct food additives even in synthetic forms [4], yet cinnamon provides them in a natural safe route to the consumer. Camphor from bark and roots of cinnamon is considered as a flavour enhancing compound in the food industry. The polyphenol content of cinnamon inhibits the lipid rancidity and reduces the deterioration rate. Incorporation of 3% cinnamon extract to butter resulted in low levels of peroxide value, free fatty acids value and low microbial count compared to the butter without a preservative and potassium sorbate added butter [5]. Antioxidant activity of cinnamon extends the shelf life of butter. Vidanagamage et al., suggested that cinnamon extract can be used to formulate an antioxidant-rich butter as a natural preservative for butter [5].

The essential oil of cinnamon has the potential to apply as a natural preservative in perishable food items such as fruits, fish and meat. Essential oil applications of true cinnamon have demonstrated its potential in inhibiting the mycelial growth of fungus in fruits and claimed as a preservative for perishable fruits [6]. Moreover, the food preservative properties of cinnamon have been investigated in fish at room temperature, fried fish, and deep-fried fish; as the activity index of the cinnamon is more than 0.5 [2]. In the same study, it has been proposed to coat the cinnamon paste in the inner package as a preservative. Ojagh et al., explained that the antioxidant mechanism of chitosan-based coating with cinnamon on fish enabled the good quality characteristics to be retained longer, extending the shelf life of fish [7] which encapsulated cinnamon essential oil into chitosan nanoparticles of three sizes [8]. These nanoparticles improved the antioxidant and antimicrobial properties of pork and acted as a natural preservative for meat. The nanoparticles with bigger size prolonged the shelf-life of the chilled pork by maintaining the quality of meat and meat products. The chitosan-based cinnamon coating on the defense-related enzymes, free radical scavenging activity, and the permeability and integrity of fruit cell membrane in fruits [9] are evidenced the suitability of applications of cinnamon as a natural preservative [10]. developed an anti-insect food packaging film containing cinnamon oil encapsulates that ensures the insect repelling properties of cinnamon without affecting the sensory qualities of the food.

The essential oil of true cinnamon has been examined for its preservative properties in bakery items as well. The effects of the cinnamon oil in cream-filled cakes as a natural preservative in bakery industry especially for cream-filled cakes and pastries, have been identified [11]. Cinnamon improved the sensory quality of the cinnamon-based products while acting as a preservative. Kordsardouei et al., discussed the preservation effects of essential oil of true cinnamon for applications in cakes and suggested cinnamon as a powerful natural food preservative that can replace the synthetic preservatives and additives in foods [12]. Ceylon cinnamon has a higher potential to replace synthetic preservatives that are carcinogenic or toxic.

Due to the above advantages of true cinnamon, it is ethical and essential to differentiate the same from cassia in the industrial applications [13, 14]. Moreover, economic, social and environmental aspects of the cinnamon industry achieved sustainability for a long time. This is one of the major plantation industries which shares the harvest with its workforce. Harvest sharing varies from 33–50% between the grower/planter and the peeler [15].

East Asian cinnamon growing nations, such as Indonesia, China, and Vietnam control the lion’s share of the global cinnamon market. Four Asian cinnamon producers supply different cinnamon varieties to the global market; Indonesian cinnamon (Cinnamomum burmannii) by Indonesia, Cassia cinnamon (C. cassia) by China, Saigon cinnamon (C. loureiroi) by Vietnam, and True cinnamon or Ceylon cinnamon (C. zeylanicum) by Sri Lanka. Indonesia leads the cinnamon exports by volume followed by China and the USA leads the global cinnamon imports followed by Germany (Fig 1A). Key items of Ceylon cinnamon export basket composed of bails and cut quills, and the global market share of which is less than 10%. Mexico followed by the USA is the leading Ceylon cinnamon importer (Fig 1B).

Fig 1

Cinnamon market share & types.

(A): Market share (%) of the leading global cinnamon exporters & importers. Indonesia, holds the highest export market share, leads the global cinnamon exports followed by China. Sri Lanka, 4th largest supplier to the world cinnamon market while act as the leading supplier of true cinnamon (82%). USA dominated the cinnamon imports by placing the EU, historical leader into second place. (B): Composition of Ceylon cinnamon export basket & export destinations. Ceylon or true cinnamon exports cater both residential and commercial market segments globally. Mexico has emerged as one of the leading consumers of Ceylon cinnamon together with Latin America placing USA and EU into second place.

Ceylon cinnamon tree is a moderately sized, bushy, evergreen tree up to 16 m tall and 60 cm diameter. Buttresses up to 60 cm high, out 70 cm, thin. Cassia is a conical shaped small tree which maintains 3–4 m height under cultivation. Ceylon cinnamon branchlets are slender, compressed, glabrous, end bud partly finely silky, bright or light red. Leaves opposite or sub opposite, glabrous, oval or elliptic to lanceolate-oval or narrowly elliptic or broadly acuminate. Upper surface of the leaves is dark green, shining, smooth while the lower surface is paler. Leaves have 3 main prominent veins on both surfaces. Cassia leaves are opposite, glabrous above, minutely hairy below, hairs microscopic, three-ribbed from about 5 mm above the base, side veins ascending to the apex. Axillary panicle of Ceylon cinnamon is 20 cm long main peduncle and a few, stiff short branches while inflorescence is axillary panicle of Cassia, exceeding the leaves, many flowered, long peduncle, flowers with long pedicel and minutely hairy [16]. Pale yellowish green flowers and the dark purple fruit of both species have almost similar features (Fig 2). Colour and art of processing cinnamon quills help to distinguish the Ceylon cinnamon from Cassia. Cassia bark peels are dark brown-red coloured, double-sided rolls with a hollow structure, and thicker sticks of lumpier and tougher texture. Compared to the Ceylon cinnamon, Cassia has very strong pungency in flavour. Tan-brown coloured and smooth textured Ceylon cinnamon quill composed of tight thinner layers. After powdering the quills, it is very difficult to identify the differences between these two species without microscopic identification. Presence of a number of rounded sclereids as single or small groups in the microscopic observation is the prominent characteristic to identify Ceylon cinnamon following plentiful fibers with small uneven lumen and a lot of starch grains. Very rarely a traceable amount of needle-shaped crystals of calcium oxalate can be identified; however, cork fragments are absent or very rare. Microscopic identification of Cassia powder consists of a large amount of starch granules and greater fiber diameter with an average diameter 69.60 ± 8.85 μm. The average diameter 52.00 ± 5.25 μm of Ceylon cinnamon fiber provides an obvious physiochemical characteristic to differentiate it from Cassia powder [17].

Fig 2

The images of Cassia vs Ceylon cinnamon to compare the morphological characteristics.

Morphological characteristics of leaves, flowers, fruit, unprocessed bark and processed bark of C. zeylanicum Vs C. cassia is graphically compared.

Sri Lanka is renowned for centuries for producing and supplying true cinnamon to the world and, it currently holds 80% of the true cinnamon market. Ceylon cinnamon comes from the dried bark of a perennial tree, C. zeylanicum, native to Sri Lanka. Historical evidence proved that Ceylon cinnamon was used as a natural preservative for meat in the 14th and 15th centuries. Quills were the first cinnamon products to be sold. The art of quill making is unique to Sri Lanka and the quill (quills are made by rolling of pieces of peeled barked joining together to get a pipe-like structure in 42’ or 21’ length) is currently not registered as a protected product. In contrast, the processing technique of Cassia cinnamon is different from true cinnamon and this helps consumers to separate Ceylon cinnamon from Cassia. Uses of cinnamon vary from region to region; USA and Canada use it as an ingredient of cooking, Latin America use in spice mixes, UK and EU use it for baking and Japan use it in chocolate and confectionery products.

However, Ceylon cinnamon’s characteristic chemical properties have attracted a significant number of consumers of modern knowledge base society. More than 80 compounds were identified from different parts of the cinnamon tree. The leaf oil has a major compound called eugenol which is present in higher levels in Ceylon cinnamon than in other Cinnamomum species [18, 19]

Ribeiro et al., analyzed the major compounds of leaf in C. zeylanicum and reported the presence of major compounds as Benzyl benzoate 74.2%, alpha-phellandrene 6.9%, alpha-pinene 3% and linalool 2.7% [19].

Cinnamaldehyde and camphor have been reported to be the major components of volatile oils from stem bark and root bark, respectively [20]. The chemical component of bark of C. cassia is reported as E-Cinnamaldehyde 92–98%, Z-cinnamaldehyde 0.8–2.7%, β-caryophyllene 0.4–3.6%, Coumarin 0.1–1.6% and α-ylangene 0.1–2.7%. Cinnamaldehyde level in Ceylon cinnamon is approximately 50–63% is the basis of its mild flavour compared to Cassia [21]. Proanthocyanidins-rich true cinnamon extract from the bark resulted in higher functional activities before the spray drying, freeze-drying, and concentrated processing. Total content of proanthocyanidins (mg eq procyanidin B2/g of extract dry basis) analysis showed the following; Folin-Ciocalteu reduction power (mg eq. Galic acid/g of extract dry basis), antioxidant capacity by DPPH and FRAP (mmol eq. Trolox/g of extract dry basis) and inhibitory activities (IC50) of α-amylase and α-glucosidase (mg/ mL of reaction medium) for the Ceylon cinnamon extracts were 419 ± 4, 740 ± 8, 2304 ± 62,1277 ± 87, 4.1 ± 0.2, 6.3 ± 0.1, respectively [22].

Trans-cinnamyl acetate was found to be the major compound in cinnamon fruits, flowers, and fruit stalks. These volatile oils were found to exhibit antioxidant, antimicrobial, and antidiabetic activities. Ceylon cinnamon bark and fruits contained proanthocyanins with doubly linked bis-flavan-3-ol units in the molecule [20]. The major important difference between true cinnamon and the Cassia cinnamon has been their Coumarin content [23] Coumarins are naturally occurring plant compounds with strong anticoagulant properties which are toxic to the liver. The Coumarin content in Ceylon cinnamon appears to be none or in trace amounts [24].

Key research questions of this study were; how do consumers recognize the type of cinnamon they consume based on label attributes of the retail packs of the cinnamon value-added products? Will existing labels provide sufficient information to the global consumers and catering to their demands?

Food label, served as a communication tool between manufacturer and consumers. Consumer’s ability to understand the label content and responsible labels with clear information, secure and protect the consumers. Food labels facilitate consumers to make correct food selection as well as prevent from foodborne illnesses and allergic reactions. Incorrect and misleading food labelling is a major source of frustration for buyers. Cinnamon, a plant which grows in one part of the world and consumes in another essentially needs to have responsible labelling procedures. In finding answers to the above questions, the present study aimed at assessing the clean claims of the labels of cinnamon value-added retail packs and an eyeing to identify the current level of marketing information available to the consumer. Claims were investigated through the label attributes with the main focus on the identification of the proportion of cinnamon products carrying the claims; cleaner, healthier, nutritional content, sustainability, country of origin, etc. and finding out the consumer trends of the key markets.

Materials and methods

The present study adopted a mixed-method approach to investigate the clean label claims of cinnamon products, employing two main strategies (Fig 3). First, a survey strategy became instrumental in collecting the photographs of the value-added cinnamon retail packs available in retail chains of the USA, UK, Mexico, Japan and products of Ceylon cinnamon exporters. The sample profile was composed of retail pack labels of cinnamon quills (48), cinnamon powder (46), cinnamon tea (54), breakfast cereals (41), bakery and confectionery (56) and nutraceuticals (31). Photographs of each product were taken; front of the pack and back of the pack, and a digital database was developed. Value-added cinnamon retail packs were categorized into 6 groups (quills, powder, tea, breakfast cereals, confectionery and bakery and nutraceuticals) for analytical purposes.

Fig 3

Process of the research.

Second, processed cinnamon quills were collected from main cinnamon growing areas of Sri Lanka, and samples were dispatched for testing and experiments were conducted in Toyo University, Japan. Commercial samples were also analyzed for the comparison (Gaban, Malasiya; Hachi, Vietnam). Coumarin was analyzed according to a modified method described by the [25]. Each sample was prepared by grinding sea sand with 500 mg of cinnamon pre-treated extracts and prepared the methanol extract (with 100 ppm 4-methylumbelliferone as an internal standard). The aliquots of the solution were sonicated for 15 min and placed in a dark place for 12 h at 50°C. The aliquots were centrifuged at 20,000 g for 5 min. Liquid chromatography-tandem mass spectrometry was followed using the column of Waters Acquity HSS T3 C18 (2.1 mm×100 mm).

A content market analysis was performed to investigate the claims of the cinnamon value-added products. Mandatory and volunteer labelling requirements of Codex Alimentarius [26] were used as a guide for the label analysis. General standards for spices have not yet been prepared and they are still in discussion stage in different forums of Codex Alimentarius commission. Therefore, labelling procedure for the cinnamon products should be adapted regulations following general standards; the revised document in 2018 of the General standards for the labelling of prepackaged foods CXS 1–1985 Codex Alimentarius commission and amended in EU Regulation No. 1169/2011 of the European Parliament and of the council on the provision of food information to consumers [25, 27]. Key dimensions considered were; product name, brand, common name and botanical name of cinnamon species, nutrient profile, ingredients, product origin, label claims (clean, healthy and other), mandatory and voluntary standards and certification and consumer warnings.

Claims of clean, nutrition and other aspects which were found on cinnamon value-added retail packs were extracted, classified and added to the database [28]. Further, claims were technically validated against Codex Alimentarius (revised in 2018) and food labelling regulations of each market [20]. Label claims were investigated through label attributes. Key considerations were on identifying the proportion of cinnamon products carrying any of the claims, and the types and prevalence of claims of clean, nutrient profile, health, sustainability, nature, and country of origin, etc. Following definitions were considered as the baseline for label claims;

Clean claims: short, simple ingredient list, replace artificial colours, flavours, clear packing and implementing suitable practices to ensure sustainability status [29].

Nutrient claims: nutrient content, amount, presence or absence of total fat, trans fat, saturated fat, cholesterol, vitamin and nutrients, sugars, sodium, poly and unsaturated fatty acids, fibre, protein and energy [30].

Specific health claims of cinnamon; mainly the statements on health effects of cinnamon such as disease risk reduction claims (lowering blood sugar, cholesterol, anti-inflammable, anti-cancer, etc.), functional claims (similar effects as with Insulin hormone, in managing blood sugar levels) and consumer warnings (Coumarin content, excessive consumption, side effects, allergies, etc.). Health claims on cinnamon labels which were statements about the health effects or functional properties, which may significantly contribute to managing health status [29]. General health claims formed another set of information available for consumer and, front of the pack claims were identified and recorded by the research team based on Codex-Alimentarius and market regulations.

Moreover, the study aimed to measure the information embedded in photos of cinnamon value-added products where size and entropy related measures were considered. Photos of the same size and quality were analyzed to identify the main objects in labels of 6 groups of cinnamon value-added products. Relative size (height and width ratio of the product image), of the cinnamon quill or cinnamon name, were measured to identify the positioning of cinnamon as a promotional strategy in value-added products. Each label was weighted based on the relative image size of the cinnamon quill or name and weights ranged from 3 for equal size, 2 for half the size and 1 for a quarter of the size and 0 for non-availability of an image. Positioning strategy brings a message to the consumer, where the relative size of the term, “cinnamon”, ultimately indicates the importance of the main ingredient as well as which product labels away from the strategy. According to the size of the term, “cinnamon”, as positioning strategy in the label, the scores allocated were 3 for same or equal size to the other letters of product, 2 for half of the size, 1 for a quarter the size, and 0 for none availability of the term. Moreover, researchers obtained photographs of the labels of the retail packs of cinnamon value-added products exported by the Sri Lankan exporters. Export-oriented value-added products of 48 regular cinnamon exporters were considered for the analysis. Label architecture of 6 cinnamon value-added products available in 5 markets were compared with food label regulations of each market and general food label regulations of FAO. The association between existing label content and expected label attributes by regulation was tested by performing Chi-square tests. The null hypothesis; no significant association between the existing label vs the expected label attributes by regulation and alternate hypothesis for positive significant association of it were tested to find out the label status. Odds ratio calculations help to identify the mean difference of the label attributes from the regulations.

Measuring consumer perception on labels of cinnamon value-added products on purchase intentions were measured through representative focus group discussions conducted in each market destination. The study was carried out in accordance with the recommendations of the Ethical Review Committee of Sabaragamuwa University of Sri Lanka, national regulations and institutional guidelines did not require approval from an ethics committee for this research. Study based on product labels and limited number of consumers as focus group participants. All the focus group participants gave oral informed consent for anonymous use of the data for research purposes. Participants for focus groups were selected through a questionnaire and recruitment criteria were regular consumers of cinnamon value-added products, purchase from retail chains and use label information before purchase. Five focus group discussions were completed with 50 participants (Table 1). Focus groups were conducted within the university premises and the discussion formats were prepared and managed by the researchers. Retail packs of cinnamon value-added products available in each market were used for measurements. Each retail pack was evaluated individually. At the end of focus group discussions, consumers ranked the packages based on the clean status of the label.

Table 1

Consumer profile of the focus group discussions.

Focus group	Female consumers	Male consumers	Age group	Occupation	Responsibility on food purchase (%)
USA	6	4	31–40 = 18	Junior executive = 10	70
Mexico	8	2	41–50 = 10	Senior executive = 12	80
UK & EU	7	3	51–60 = 10	Junior academic = 18	100
Japan	6	4	>60 = 12	Senior academic = 10	80

Results and discussion

Ceylon cinnamon and its value-added products were considered as an important natural additives and preservatives and the claim dates back to the time of Pharaoh. Trade competitiveness, the emergence of substitutes (Cassia, Kerinchi and Saigon) and value addition in a third country, have given rise to questions on cleanliness of value-added retail packs of cinnamon. Health and other claims as well as consumer warnings on excessive consumption of Coumarin, has attracted the attention of global consumers eyes on the clean status of the label and product authenticity. The experimental results show none or trace amounts of Coumarin available in Ceylon cinnamon irrespective of the agro-ecological zones they come from (Table 2). Blueprint of the clean status of cinnamon value-added retail packs available in USA, EU, UK, Japan and Mexico, reveals the present status of the label attributes (Fig 4). Cinnamon is graded by the relevant national standard of the country of production; ISO standard 6538–1997 for Cassia and 6539–2014 Ceylon cinnamon. The general food law highlighted that to guarantee food safety and to allow appropriate action in cases of unsafe food, food products must be traceable throughout the supply chain or value chain and risks of contamination must be limited. Unfortunately, value-added cinnamon products enter into the market with unknown country of origin and limited traceability.

Table 2

Coumarin content of cinnamon.

Type of the Sample	Origin	Coumarin content (mg/g DW)
Ceylon cinnamon sticks	Sri Lanka (Uragaha)	0.003 ± 0.001a *
Ceylon cinnamon sticks	Sri Lanka (Meetiyagoda)	0.023 ± 0.004a
Ceylon cinnamon sticks	Sri Lanka (Ahugalla)	0.004 ± 0.001a
Ceylon cinnamon sticks	Sri Lanka, Products of Gaban Co. Malaysia	0.006 ± 0.001a
Ceylon cinnamon powder	Sri Lanka, Products of Gaban Co. Malaysia	0.968 ± 0.632bc
Cinnamon powder	Hachi Co., Vietnam	2.231 ± 0.459b

Lower limit of detection = 0.003 mg/g DW; Lower limit of quantification 0.008 mg/g DW.

*Average mean values (SD) and means within a column with different superscripts are significantly different by Duncan’s multiple range test (p < 0.05).

Fig 4

Blueprint of the clean labels.

An overview of the types of claims displayed on the labels of cinnamon value added retail packs. Organic, natural, clear information, list of ingredients and traceability are sub claims of clean label claims. Nutrition claims mainly appeared as nutrient content, specific and general health claims. Country of origin, manufacturer, brand, allergens, irradiation free, non GMO, method of processing, vegetarian were other common claims. Symbols of standards and certifications appear as evidence for the consumers.

Front of pack, back and side labels of the retail packs of cinnamon quills available in four main markets and products of Sri Lankan exporters were used only the common name, “cinnamon” and its ingredient profile. Country of origin, available standards, certifications and consumer warnings appeared as secondary level label claims (Fig 5). Similar patterns were observed in the labels of cinnamon powder products and where special claims, consumer warnings and claims on Ceylon cinnamon were considered as an important feature. Ceylon cinnamon quills carry its own identity and unique hand-crafted quill making tradition of Sri Lankans, giving an identical shape and colour which separate it from other cinnamon types. Ceylon cinnamon is considered superior to other Cassia cinnamon types due to its ultra-low levels of Coumarin (toxic, fragrant, organic chemical compound), (<0.01 mg/g DW) and existing regulations highlight the safe levels of average daily consumption of coumarin; the European Food Safety Authority (EFSA) has recommended a Coumarin daily intake limit of 0–0.1 mg/kg body weight per day [31]. According to our experimental results, one teaspoon (out of 5g) of powdered Cassia bark contains 4.85 mg of Coumarin from the samples sourced from Malaysia and 11.15 mg from the samples of Vietnam, respectively (Table 2). German Federal Institute for Risk Assessment evidenced, 1 kg of Cassia powder contains approximately 2.1–4.4 g of Coumarin [32]. This is beyond the Tolerable Daily Intake for Coumarin of 0.1mg/kg body weight/day recommended by the EFSA. However, both types appear in the marketplace as a common term, cinnamon. Coumarin, a flavouring which can cause hepatotoxicity and the tolerable daily intake may be exceeded in consumers with high intake of cinnamon containing high levels of Coumarin [33, 34]. Ceylon (C. zeylanicum) and Cassia cinnamon (C. aromaticum) are two main types of cinnamon traded globally. Cassia cinnamon, which currently is most frequently used in food products trading globally, contains more Coumarin than lesser used Ceylon cinnamon [33].

Fig 5

Cinnamon label claims in deferent markets.

(a) Label claims of the cinnamon quills available in the main markets. Null hypothesis was rejected (Decision rule p≤ 0.05); there was a significant association between markets and label claims of cinnamon quills. Common name, pure Ceylon cinnamon logo, health claims, nutrient profile, cassia cinnamon, botanical name, and ingredients showed significant relationship. Label attributes; Country of origin (p = 0.465), Common Name (p = 0.025), Pure Ceylon cinnamon logo (p = 0.039), Health claim (p = 0.042), Nutrient profile (p = 0.042), Ceylon cinnamon (p = 0.176), Cassia cinnamon (p = 0.034), Botanical name (p = 0.042), Ingredients (p = 0.025), Standards & Certifications (p = 1.000), Consumer warnings (p = 0.080), and Special claims (p = 0.068) were considered for the hypothesis testing. (b) Label claims of the cinnamon powder available in the main markets. Null hypothesis was rejected (Decision rule p≤ 0.05); there was a significant association between markets and label claims of cinnamon powder. Common name, pure Ceylon cinnamon logo, health claims, cassia cinnamon, and botanical name showed significant relationship. Label attributes; Country of origin (p = 0.492), Common Name (p = 0.025), Pure Ceylon cinnamon logo (p = 0.039), Health claim (p = 0.039), Nutrient profile (p = 0.102), Ceylon cinnamon (p = 0.498), Cassia cinnamon (p = 0.039), Botanical name (p = 0.031), Ingredients (p = 0.066), Standards & Certifications (p = 0.498), Consumer warnings (p = 0.068), and Special claims (p = 0.786) were considered for the hypothesis testing. (c) Label claims of the cinnamon tea available in the main markets. Null hypothesis was rejected (Decision rule p≤ 0.05); there was a significant association between markets on label claims of cinnamon tea. Common name, pure, cassia cinnamon, botanical name, ingredients and consumer warnings showed significant relationship. Label attributes; Country of origin (p = 0.258), Common Name (p = 0.025), Pure Ceylon cinnamon logo (p = 0.066), Health claim (p = 0.715), Nutrient profile (p = 0.345), Ceylon cinnamon (p = 0.684), Cassia cinnamon (p = 0.025), Botanical name (p = 0.034), Ingredients (p = 0.025), Standards & Certifications (p = 0.465), Consumer warnings (p = 0.034), and Special claims (p = 0.893) were considered for the hypothesis testing. (d) Label claims of the cinnamon based breakfast cereals available in the main markets. Null hypothesis was rejected (Decision rule p ≤ 0.05); there was a significant association between markets on label claims of cinnamon based breakfast cereals. Country of origin, common name, pure Ceylon cinnamon logo, Ceylon cinnamon, cassia cinnamon, botanical name, and ingredients showed significant relationship. Label attributes; Country of origin (p = 0.046), Common Name (p = 0.046), Pure Ceylon cinnamon logo (p = 0.046), Health claim (p = 0.581), Nutrient profile (p = 0.059), Ceylon cinnamon (p = 0.046), Cassia cinnamon (p = 0.046), Botanical name (p = 0.046), Ingredients (p = 0.046), Standards & Certifications (p = 0.854), Consumer warnings (p = 0.059), and Special claims (p = 0.450) were considered for the hypothesis testing. (e) Label claims of cinnamon based bakery & confectionery products available in the main markets. Null hypothesis was rejected (Decision rule p≤ 0.05); there was a significant association between markets on label claims of cinnamon based bakery and confectionery products. Country of origin, common name, pure Ceylon cinnamon logo, cassia cinnamon, and botanical name showed significant relationship. Label attributes; Country of origin (p = 0.046), Common Name (p = 0.046), Pure Ceylon cinnamon logo (p = 0.046), Health claim (p = 0.276), Nutrient profile (p = 0.465), Ceylon cinnamon (P = 0.059), Cassia cinnamon (p = 0.046), Botanical name (p = 0.046), Ingredients (p = 0.059), Standards & Certifications (p = 0.465), Consumer warnings (p = 0.715), and Special claims (p = 0.465) were considered for the hypothesis testing. (f) Label claims of the nutraceuticals available in the main markets. Null hypothesis was rejected (Decision rule p≤ 0.05); there was a significant association between markets on label claims of cinnamon nutraceutical. Common name, pure Ceylon cinnamon logo, health claims, nutrient profile, cassia cinnamon, ingredients, consumer warnings, and special claims showed significant relationship. Label attributes; Country of origin (p = 0.258), Common Name (p = 0.025), Pure Ceylon cinnamon logo (p = 0.025), Health claim (p = 0.034), Nutrient profile (p = 0.025), Ceylon cinnamon (p = 0.336), Cassia cinnamon (p = 0.039), Botanical name (p = 0.492), Ingredients (p = 0.025), Standards & Certifications (p = 0.500), Consumer warnings (p = 0.025), and Special claims (p = 0.043) were considered for the hypothesis testing.

Cinnamon quill and powder labels have ignored the most important messages on their labels and existing labels were devoid of clean claims. Label contents of cinnamon value-added products that were considered for analysis behave differently and brought a variety of information to the notice of consumer. Consumer warnings, standards and certifications, health and special claims, and mentioning of product as Ceylon cinnamon were prominent in label claims of cinnamon tea, breakfast cereals, confectionery and bakery and nutraceuticals (Fig 6). Labels of nutraceuticals were more informative and comprehensive compared to other value-added forms and manufacturers had designed the products to meet the specific regulatory requirements of the markets. Nutraceuticals and labels of cinnamon value-added products available in EU and USA markets were closer to the clean claims whereas cinnamon quills, powder and products available in Mexican market were found to be far away from the clean concepts with very limited information.

Fig 6

Mean difference of the present label attributes with labelling requirements of FAO (Codex Alimentarius).

The no. of observations in each category was cinnamon quills (48), cinnamon powder (46), breakfast cereals (41), Confectionery and bakery (56), Nutraceuticals (31), and cinnamon tea (54). Mean label attribute sizes shown with 95% confidence interval.

Hypothesis testing showed the association between present label attributes and expected label attributes of 6 different cinnamon value-added products available in 5 different markets (Table 3). Cinnamon quills available in all marketplaces show no association between the attributes of present labels and expected labels by the food law. In contrast, labels of cinnamon powder in the USA market as well as the Sri Lankan exporters showed a positive association between the attributes of present labels and expected labels. Furthermore, cinnamon tea labels followed a similar pattern and both cinnamon tea labels found in the USA market as well as the cinnamon tea exports from Sri Lanka were in line with the expected labeling requirements. Moreover, cinnamon breakfast cereals, confectionery and bakery products, and nutraceuticals of the USA market have positive association between current label attributes vs expected labels. Label attributes of cinnamon value-added products for all other markets considered were in need to improve their status to meet the regulatory expectations. Odds ratio analysis derived the holistic view on present label attributes of 6 different cinnamon products were considered for 5 marketplaces.

Table 3

Association between present label attributes vs expected label attributes of 6 different cinnamon value-added products.

Countries		Quills	Powder	Tea	Cereals	Confectionaries & Bakery	Nutraceuticals
USA	P value	0.133	0.288	0.873	0.470	0.781	0.067
	Confidence interval	-60.0 (-85.0,14.0)	-31.0 (-70.0, 17.0)	0.00 (-54.0, 57.0)	-3.0 (-100, 48.0)	0.00 (-76.0, 67.0)	88.0 (0.00, 94.0)
Europe & UK	P value	0.586	0.604	0.843	0.248	0.202	0.680
	Confidence interval	-16.0 (-66.0, 33.0)	17.0 (-66.0, 67.0)	0.00 (-60.0, 40.0)	0.00 (-100, 0.00)	-29.0 (-100, 14.0)	0.00 (-40.0, 60.0)
Japan	P value	0.205	0.176	0.874	0.731	0.092	0.123
	Confidence interval	-28.0 (-57.0, 29.0)	-50.0 (-83.0, 17.0)	0.00 (-50.0, 50.0)	0.00 (-33.0, 100)	-60.00 (-100, 0.00)	60.0 (0.00, 100)
Mexico	P value	0.058	0.183	0.370	0.796	0.044	0.166
	Confidence interval	-50.0 (-100, 0.00)	-34.0 (-67.0, 33.0)	-33.0 (-100.0, 33.0)	0.00 (-100, 67.0)	-67.00 (-100, 0.00)	67.0 (0.00, 100)
Sri Lanka	P value	0.812	0.726	0.152	-	-	0.248
	Confidence interval	0.00 (-56.0, 34.0)	7.0 (-53.0, 72.0)	57.0 (-7.0, 93.0)	-	-	0.00 (0.00, 100)

Size and entropy related measures of label analysis aimed to identify the product positioning strategy based on cinnamon as the main ingredient. Relative size of the image (cinnamon quill), type of cinnamon (true/Ceylon cinnamon or Cassia cinnamon) and the term, “cinnamon”, were analyzed in all product categories across the main markets. In general, in respect of the types of cinnamon, images were available of Cassia cinnamon but none from true cinnamon. Low level of consumer awareness in the international market on the difference between true cinnamon and Cassia cinnamon allows manufacturers to provide misleading label information. Present labelling behaviour was found to be far away from clean concepts and claims but more closer to dirty labels. On the other hand, labels of the Sri Lankan exporters who were considered, displayed the true cinnamon quill for its authenticity, but their limited market operations tend to hinder the information available for consumers.

Analysis of label objects, images and words, facilitate to understand the clean claims of the labels via its product positioning strategy; cinnamon as a key ingredient. Cinnamon based value-added forms; breakfast cereals, cinnamon tea, confectionery and bakery and nutraceuticals, utilized various positioning strategies, objects and words to position products in the marketplace. Fig 7 explains the present status of the label objects in the main markets. Equal size letters have been used for the name of the product and the term “cinnamon” in 4 main markets while letters in half the size height use for all markets. Positioning approach caters to the information necessitated by the consumers. On the other hand, half the size image of cinnamon was found in the packages of breakfast cereals of 3 main markets but all pictures were of Cassia cinnamon. None of the labels used pictures of true cinnamon and which may indirectly indicate the type of ingredient or cinnamon available in breakfast cereals. In contrast, label object analysis of cinnamon tea showed positive clean claims, where equal and half the size of height of term, “cinnamon” and an image of cinnamon appeared in all labels. Labels in cinnamon tea were cleaner compared to breakfast cereals (Fig 7). Unfortunately, none of the labels displayed any image of true cinnamon, except in cinnamon tea exported from Sri Lanka.

Fig 7

Assessment of positioning strategy through label objects.

Assessment of positioning strategy through label objects: an image of cinnamon and word, cinnamon in cinnamon-based breakfast cereals (a); cinnamon tea (b); cinnamon based bakery and confectionery (c); and nutraceuticals (d).

Cinnamon is widely used globally in bakery and confectionery industry, as a key ingredient. Labels of bakery and confectionery products used for analysis showed a less clean status compared to that of breakfast cereals and tea (Fig 8). A limited number of products have displayed the term “cinnamon” in equal and half the size in front of the pack while showing an image of cinnamon. In contrast, label objects of nutraceuticals displayed both the term and an image of “cinnamon” in equal size (Fig 8). None of the labels have shown the image of true cinnamon in labels and declaration of this information is mandatory for all markets considered. Label contents were measured and scores were allocated to rank the clean status of labels in each main market. Best clean claims were recorded for bakery and confectionery category in the USA market, breakfast cereals in the Japanese market, cinnamon tea and nutraceuticals from the Sri Lankan exporters.

Fig 8

Clean label status of the cinnamon value-added retail products in the main markets.

Bakery and confectionery of USA market, cinnamon tea of UK/EU market, bakery and confectionery of Mexican market, Nutraceuticals of Japanese and Sri Lankan exporters were recognized as the market with key clean labeled products.

Focus group discussions were used to sketch the characteristics of the global cinnamon consumer. Consumer base was composed of the young and mid-aged (68%) and the very elderly (24%). Occupational profile represented 56% of junior executives and academics with postgraduate qualifications. The majority (65%) of them were responsible for the purchase of food for their households. All selected consumers were regular consumers of cinnamon as breakfast cereal, bakery products, confectionery, etc. In general, an average consumer had no clear idea on the difference between the true cinnamon and Cassia cinnamon. The purpose of their consumption of cinnamon lay in the taste and aroma (85%) of cinnamon, and its health claims (15%). A limited number of consumers (12%) were able to recognize the difference between true cinnamon and Cassia and the health impacts of true cinnamon. On the other hand, clean labels; brief ingredient list, chemical composition especially the Coumarin and phytochemical properties, simple and clear packaging, geographical indication and traceability were found to be demanded by the cinnamon consumers. True or Ceylon cinnamon’s share of the world market is about 8% and the lion’s share is held by the Cassia cinnamon. High level of Coumarin in cassia and its impact on human health was recognized and published as a scientific truth [34]. confirmed that high levels of Coumarin in Cassia on quantification of flavoring constituents in cinnamon based on German retail market. Risk assessment of Coumarin intake of Norwegian nationals [31] also confirmed the possible adverse health risks of Coumarin consumption by exceeding tolerable daily intake 3-fold for 1–2 times a week. Further, a case of famous Danish cinnamon roll, Danish Food Safety Authority has shown that the product significantly exceeds the limit for daily intake [35]. Clean status of the labels, especially, which type of cinnamon was used in value addition; true cinnamon or Cassia forms an essential piece of information that should be shared with consumers.

Conclusions

For centuries, Ceylon cinnamon is a natural flavouring additive and a preservative that has been providing numerous health benefits to the consumer through the food they consume. C. zeylanicum has a health favourable chemical profile and does not contain Coumarin, a carcinogenic compound, which is present in the other most consumable cinnamon types in the global market. It is an obvious fact that the consumer has the right to know what they consume and in which quantities. The only possible way of signaling or providing such information is the package and its label. Key label claims of cinnamon products consist of traits such as clean, health, nutrient and sustainability. Cinnamon quill and powder, which are basic value-added forms, have ignored the regulatory and mandatory labeling requirements of the main markets. In contrast, labels of breakfast cereals, bakery and confectionery moderately cater to the demands of clean status. Cinnamon tea and nutraceutical labels were closer to clean status by providing mandatory information requirements of consumers. Unfortunately, about 90% of labels that were considered by this research, displayed only the images of Cassia cinnamon, apart from the labels of Ceylon cinnamon exporters. Clean labels carrying mandatory labelling information formed an asset to consumers of USA, UK, Japan and buyers of Sri Lankan cinnamon exporters. As the main cinnamon buyer and largest traditional consumer, Mexico was far behind the mandatory labelling requirements and clean status. Cinnamon tea and nutraceuticals available in the USA market were able to claim the clean label status. Cinnamon consumers were concerned about clean labels; brief ingredient list, chemical composition, especially the Coumarin and phytochemical status, simple and clear packaging, geographical indication and traceability.

As there are different cinnamon varieties with different chemical contents, which differ each other by their chemical properties, available in the market, the authors of this paper suggest to include the botanical name (Linnaeus nomenclature) of the cinnamon species, from which derived the product to the label in order not to mislead or confuse the consumer.

Coumarin content of cinnamon, coumarin content of six deferent samples were analyzed in order to compare the constituent.

(XLSX)

Click here for additional data file.

Cinnamon label claims in deferent markets, label claims as country of origin, common name, pure Ceylon cinnamon logo, health claim, nutrient profile Ceylon cinnamon, Cassia cinnamon, botanical name, ingredients, standards and certifications, consumer warnings and Special claims were considered for six different products.

(XLSX)

Click here for additional data file.

Positioning strategy through label objects, sizes of the cinnamon image and wording appeared in the packaging considered for the assessment of cinnamon based breakfast cereals; cinnamon tea; cinnamon based bakery and confectionery; and nutraceutical.

(XLSX)

Click here for additional data file.

Clean label status of the cinnamon value-added retail products in the main markets, bakery and confectionery of USA market, cinnamon tea of UK/EU market, bakery and confectionery of Mexican market, Nutraceuticals of Japanese and Sri Lankan exporters were recognized as the market with key clean labeled products.

(XLSX)

Click here for additional data file.

Disclose of brands, products in different regions were identified with categories and brand names to evaluated the label content.

(XLSX)

Click here for additional data file.

19 Apr 2021

PONE-D-21-06322

Clean vs dirty labels: transparency and authenticity of the labels of Ceylon cinnamon

PLOS ONE

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Reviewer #2: Partly

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Reviewer #1: 1. This manuscript dealt with the impact of labels on the marketing of Ceylon cinnamon. The resulting data are practicable for the related field.

2. The resolution of all figures is low and thus it's very difficult to analyze the data.

3. Some grammar errors are listed as follows and they should be improved.

4. Abstract: market place - marketplace; neutriceuticals - nutriceuticals?; seventy six - seventy-six; liewithin - lie within

5. line 3: to 14th - to the 14th

7. line 11: nutritional quality and taste is - nutritional quality and taste are

8. line 9: a significant - significant

9. line 462: signalling - signaling

10. line 466: labelling - labeling

11. line 475: in USA market - in the USA market

12. line 475: were concern on - were concern about

13. The keyword "Clean label Content marketing" seems not appropriate. How about "Ingredient transparency"?

Reviewer #2: Comment and suggestion to authors:

Manuscript ID: PONE-D-21-06322

Manuscript title: Clean vs dirty labels: transparency and authenticity of the labels of Ceylon cinnamon

1) Line63-66: “…Kerinci cinnamon (Cinnamomum burmannii) by Indonesia, Cassia cinnamon (Cinnamomum cassia) by China, Saigon cinnamon (Cinnamomum loureiroi) by Vietnam, and True cinnamon or Ceylon cinnamon (Cinnamomum zelanicum) by Sri Lanka.” The authors must pay more attention to check and use the accepted name (legitimate name) of plant species.

2) “Cinnamomum zelanicum” is the misspelling one, please carefully check the whole manuscript and correct it.

3) The authors emphasized on “True cinnamon or Ceylon cinnamon”, so its clear photo as well as the morphological characters should be provided comparing with the other commercial cinnamon.

4) The Figure 1: a) and b) should be revised and presented using high resolution.

5) The Figure 4: a) to f) should be revised and presented in the way that helps the readers easy to follow, and can see the main points easily.

6) The previous published works that related to this study should be added to discuss with these results.

7) There are many spelling mistakes and grammatical error found in this manuscript, the author should pay more attention on this point and check the whole manuscript before re-submission.

**********

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Reviewer #1: No

Reviewer #2: No

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15 Jun 2021

Reviewers' comments:

Reviewer #1:

1. This manuscript dealt with the impact of labels on the marketing of Ceylon cinnamon. The resulting data are practicable for the related field.

Response: Thank you for your positive interest in this paper and for your review.

2. The resolution of all figures is low and thus it's very difficult to analyze the data.

Response: Thank you for your comments on figures and we have improved all figures

3. Some grammar errors are listed as follows and they should be improved.

Response: Thank you for pointing them. We revised as your suggestion.

4. Abstract: market place - marketplace; neutriceuticals - nutriceuticals?; seventy six - seventy-six; liewithin - lie within

Response: Revised

5. line 3: to 14th - to the 14th

Response: Revised

7. line 11: nutritional quality and taste is - nutritional quality and taste are

Response: Revised

8. line 9: a significant - significant

Response: Revised

9. line 462: signalling - signaling

Response: Revised

10. line 466: labelling - labeling

Response: Revised

11. line 475: in USA market - in the USA market

Response: Revised

12. line 475: were concern on - were concern about

Response: Revised

13. The keyword "Clean label Content marketing" seems not appropriate. How about "Ingredient transparency"?

Response: Revised as your suggestion

Reviewer #2:

1) Line63-66: “...Kerinci cinnamon (Cinnamomum burmannii) by Indonesia, Cassia cinnamon (Cinnamomum cassia)

by China, Saigon cinnamon (Cinnamomum loureiroi) by Vietnam, and True cinnamon or Ceylon cinnamon

(Cinnamomum zelanicum) by Sri Lanka.” The authors must pay more attention to check and use the accepted name

(legitimate name) of plant species.

Response: Thank you for your comment. “Kerinci” has been changed as the Indonesian cinnamon. Kerinci is one specific region of Indonesia that Cinnamomum burmannii comes from and it is a common term when comes to Indonesian cinnamon. The other names that we mentioned here can be considered as accepted names in the industry that are using commonly.

2) “Cinnamomum zelanicum” is the misspelling one, please carefully check the whole manuscript and correct it.

Response: Revised

3) The authors emphasized on “True cinnamon or Ceylon cinnamon”, so its clear photo as well as the morphological characters should be provided comparing with the other commercial cinnamon.

Response: We have included details of both Ceylon cinnamon and Cassia

4) The Figure 1: a) and b) should be revised and presented using high resolution.

Response: Revised

5) The Figure 4: a) to f) should be revised and presented in the way that helps the readers easy to follow, and can see the main points easily.

Response: Revised

6) The previous published works that related to this study should be added to discuss with these results.

Response: Thank you for your suggestion. The manuscripts’ main focus is to discuss the mislabeling of cinnamon products where it needs clear specifications to understand the difference between different types of cinnamon in the current market. Since the demarcations between these cinnamon species are having a greater impact on different health claims, we believe that the consumer of the product should have a right to be acknowledged of what they consume.

We could find the studies which were based on the differences between the cinnamon species and supported that information to build up the discussion of this manuscript. However, there is lack of original studies (reference no. 29 and 33) on this area which directly analyzed or evaluated the labeling effect of cinnamon products which imparts the consumer with the differences between cinnamon types. The studies were in reference 29 and 33 are few

7) There are many spelling mistakes and grammatical error found in this manuscript, the author should pay more attention on this point and check the whole manuscript before re-submission.

Response: Thanks for your comment towards the improvement of this manuscript. The revised places after careful observations were highlighted by red fonts.

Editor comments:

1. Please ensure that your manuscript meets PLOS ONE’s style requirements, including those for file naming, etc.

Response: We have re-shaped the manuscript in line with PLOS ONE requirements, including the file naming, etc.

Note: Published articles of PLOS ONE carry title numbering system but we couldn’t find it in guidelines. If necessary we are happy to insert the numbers

2. We suggest you thoroughly copyedit your manuscript for language usage, spelling and grammar.

Response: Thank you for your comments and we have obtained the professional editing support from Dr. Premachandra Wattage, School of Earth & Environmental Sciences, University of Portsmouth, UK and Town & Country Planning, University of Moratuwa, Moratuwa, Sri Lanka, (Guest Editor of the MDPI/Sustainability and Land Journals)

Further, we have incorporated a copy of manuscript showing changes in a supporting information file.

Clean copy of the edited manuscript in a separate file

3. In your methods, Please provide the following information.

a. The exact sources of all samples and products use in your study

b. Any product bard names that would enable an interested researcher to replicate the sampling

Response: Thank you for pointing them. We have revised the methods section as you suggested and insert the sources of samples.

ii. Retail packs of cinnamon value-added products (quills, powder, tea, breakfast cereals, confectionery and bakery and nutraceuticals) used in USA, UK, Mexico, Japan and products of Sri Lankan cinnamon exporters

b. Any product brand names that would enable an interested researcher to replicate the sampling

Response: Thank you for the suggestion. We do agree that sharing information would facilitate future research avenues. We have made arrangements to submit our data base on cinnamon value-added retail packs with brand names as separate supplementary file. Further, we are unable to declare the brand names in methodology section due to ethical reasons that may negatively affected on brands as well as the businesses.

4. For copy right reasons, we ask that you please remove the logos from fig.3

Response: Revised the fig.3. We only keep the Ceylon cinnamon logo which we received the permission from Export Development Board of Sri Lanka, to use for research purpose.

5. Ethics statement should only appear in the methods section of your manuscript.

Response: Revised as recommended

Further, we would like to make changes to the “financial disclosure” and please find the updated version below.

“The empirical research (market survey) informing this paper was funded by the Ministry of Social Welfare and Primary Industries of Sri Lanka and the National Science Foundation. DAM received the grant for project titled, Ceylon cinnamon value chain development: Making global market space for value chain actors (SP/CIN/2016/05). DAM and RKC received the research, innovation and commercialization grant of AHEAD (Accelerating Higher Education and Development) project for the development of novel beverages from Ceylon cinnamon (6026-LK/8743-LK/ P159995) which facilitate the chemical profiling process. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.”

Submitted filename: Response to Reviewers.pdf

Click here for additional data file.

13 Aug 2021

PONE-D-21-06322R1

Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon

PLOS ONE

Dear Dr. De Silva,

Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process.

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If you would like to make changes to your financial disclosure, please include your updated statement in your cover letter. Guidelines for resubmitting your figure files are available below the reviewer comments at the end of this letter.

If applicable, we recommend that you deposit your laboratory protocols in protocols.io to enhance the reproducibility of your results. Protocols.io assigns your protocol its own identifier (DOI) so that it can be cited independently in the future. For instructions see: http://journals.plos.org/plosone/s/submission-guidelines#loc-laboratory-protocols. Additionally, PLOS ONE offers an option for publishing peer-reviewed Lab Protocol articles, which describe protocols hosted on protocols.io. Read more information on sharing protocols at https://plos.org/protocols?utm_medium=editorial-email&utm_source=authorletters&utm_campaign=protocols.

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Christophe Hano

Academic Editor

PLOS ONE

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Reviewer #1: All comments have been addressed

Reviewer #2: All comments have been addressed

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Reviewer #2: Yes

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Reviewer #2: Comment and suggestion to authors:

Manuscript ID: PONE-D-21-06322R1

Titled: "Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon"

1.) The authors must pay more attention on how to write the scientific name, specific epithet must be written in lowercase. For example, “Cinnamomum Cassia” in the figure 2 is incorrect. Please, check the whole manuscript to correct this point.

2.) There are some spelling mistakes and grammatical error found in this manuscript, the author should pay more attention on this point and check the whole manuscript before re-submission.

**********

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Reviewer #1: No

Reviewer #2: No

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While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/. PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. Then, login and navigate to the UPLOAD tab, where you will find detailed instructions on how to use the tool. If you encounter any issues or have any questions when using PACE, please email PLOS at figures@plos.org. Please note that Supporting Information files do not need this step.

18 Aug 2021

Thank you for point out the mistake in scientific name and the corrections are made in the figure two as well as in the manuscript text.

Spelling mistakes and grammatical error found in this manuscript were corrected

Submitted filename: Response to Reviewers.pdf

Click here for additional data file.

26 Sep 2021

PONE-D-21-06322R2

Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon

PLOS ONE

Dear Dr. De Silva,

Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process.

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Kind regards,

Christophe Hano

Academic Editor

PLOS ONE

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Please review your reference list to ensure that it is complete and correct. If you have cited papers that have been retracted, please include the rationale for doing so in the manuscript text, or remove these references and replace them with relevant current references. Any changes to the reference list should be mentioned in the rebuttal letter that accompanies your revised manuscript. If you need to cite a retracted article, indicate the article’s retracted status in the References list and also include a citation and full reference for the retraction notice.

Additional Editor Comments (if provided):

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Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. If the authors have adequately addressed your comments raised in a previous round of review and you feel that this manuscript is now acceptable for publication, you may indicate that here to bypass the “Comments to the Author” section, enter your conflict of interest statement in the “Confidential to Editor” section, and submit your "Accept" recommendation.

Reviewer #1: All comments have been addressed

Reviewer #2: All comments have been addressed

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2. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #1: Yes

Reviewer #2: Yes

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3. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #1: Yes

Reviewer #2: Yes

**********

4. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #1: Yes

Reviewer #2: Yes

**********

5. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #1: Yes

Reviewer #2: Yes

**********

6. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #1: (No Response)

Reviewer #2: Comment and suggestion to authors:

Manuscript ID: PONE-D-21-06322R2

Titled: "Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon"

1.) After writing the full scientific name for the first time, next time, the generic name should be written as an abbreviation. For example, the authors write “Cinnamomum zeylanicum” for the first time, the next time should use C. zeylanicum. Please, check the whole manuscript to correct this point.

2.) There are some spelling mistakes and grammatical error found in this manuscript, please check and correct before re-submission.

**********

7. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files.

If you choose “no”, your identity will remain anonymous but your review may still be made public.

Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #1: No

Reviewer #2: No

[NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.]

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15 Oct 2021

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

6. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #1: (No Response)

Reviewer #2: Comment and suggestion to authors:

Manuscript ID: PONE-D-21-06322R2

Titled: "Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon"

1.) After writing the full scientific name for the first time, next time, the generic name should be written as an abbreviation. For example, the authors write “Cinnamomum zeylanicum” for the first time, the next time should use C. zeylanicum. Please, check the whole manuscript to correct this point.

Thank you very much for point out the error and the manuscript is corrected accordingly.

2.) There are some spelling mistakes and grammatical error found in this manuscript, please check and correct before re-submission.

Thank you for point out the issue. We have corrected with spelling mistakes and grammatical error thoroughly.

11 Nov 2021

Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon

PONE-D-21-06322R3

Dear Dr. De Silva,

We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements.

Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication.

An invoice for payment will follow shortly after the formal acceptance. To ensure an efficient process, please log into Editorial Manager at http://www.editorialmanager.com/pone/, click the 'Update My Information' link at the top of the page, and double check that your user information is up-to-date. If you have any billing related questions, please contact our Author Billing department directly at authorbilling@plos.org.

If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org.

Kind regards,

Christophe Hano

Academic Editor

PLOS ONE

Additional Editor Comments (optional):

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. If the authors have adequately addressed your comments raised in a previous round of review and you feel that this manuscript is now acceptable for publication, you may indicate that here to bypass the “Comments to the Author” section, enter your conflict of interest statement in the “Confidential to Editor” section, and submit your "Accept" recommendation.

Reviewer #2: All comments have been addressed

**********

2. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #2: Yes

**********

3. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #2: Yes

**********

4. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #2: Yes

**********

5. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #2: Yes

**********

6. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #2: Manuscript ID: PONE-D-21-06322R3

Titled: "Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon

cinnamon"

Accepted in this present form

**********

7. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files.

If you choose “no”, your identity will remain anonymous but your review may still be made public.

Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #2: No

15 Nov 2021

PONE-D-21-06322R3

Clean vs dirty labels: Transparency and authenticity of the labels of Ceylon cinnamon

Dear Dr. De Silva:

I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS ONE. Congratulations! Your manuscript is now with our production department.

If your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information please contact onepress@plos.org.

If we can help with anything else, please email us at plosone@plos.org.

Thank you for submitting your work to PLOS ONE and supporting open access.

Kind regards,

PLOS ONE Editorial Office Staff

on behalf of

Dr. Christophe Hano

Academic Editor

PLOS ONE