Liqing Qiu1,2, Min Zhang1,3, Baoguo Xu4, Bin Wang5. 1. State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China. 2. International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, China. 3. Jiangsu Province International Joint Laboratory on Fresh Food Smart Processing and Quality Monitoring, Jiangnan University, Wuxi, China. 4. School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China. 5. Shandong Huamei Biology Science & Technology Co., Ltd., Pingyin, China.
Abstract
BACKGROUND: Rosa rugosa cv. Plena (RP) is a commercially significant crop with edible flowers. Due to its high medicinal and nutritional value, it has recently attracted increasing attention in the food industry. In this study, the physicochemical properties, antioxidant capacity, and hygroscopicity of four RP powders produced by ball milling were compared. RESULTS: The brightness, redness, and blueness of RP powders improved after superfine grinding. The water and oil holding capacity decreased with a reduction in the particle size but the water solubility index increased from 7.10% to 29.93%. The elements present in the powders were not significantly (P > 0.05) affected by particle size while phytochemicals were released and extracted more easily after superfine grinding, resulting in higher anthocyanin, polyphenol, and flavonoid content (3.06, 34.01, and 3.97 mg g-1 , respectively), and stronger antioxidant capacity than was found with other powders (ABTS (2,2'-azinobis-3-ethylbenzothiazoline-6-sulphonic acid) and DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activities were 24.51 and 39.81 mM trolox equivalents (TE) g-1 , respectively). Superfine grinding also improved the water-absorption capacity of RP powders under a high-RH environment. CONCLUSION: Superfine grinding is a promising technique for the production of RP powders with stronger bioactive substances and bioactivity.
BACKGROUND: Rosa rugosa cv. Plena (RP) is a commercially significant crop with edible flowers. Due to its high medicinal and nutritional value, it has recently attracted increasing attention in the food industry. In this study, the physicochemical properties, antioxidant capacity, and hygroscopicity of four RP powders produced by ball milling were compared. RESULTS: The brightness, redness, and blueness of RP powders improved after superfine grinding. The water and oil holding capacity decreased with a reduction in the particle size but the water solubility index increased from 7.10% to 29.93%. The elements present in the powders were not significantly (P > 0.05) affected by particle size while phytochemicals were released and extracted more easily after superfine grinding, resulting in higher anthocyanin, polyphenol, and flavonoid content (3.06, 34.01, and 3.97 mg g-1 , respectively), and stronger antioxidant capacity than was found with other powders (ABTS (2,2'-azinobis-3-ethylbenzothiazoline-6-sulphonic acid) and DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activities were 24.51 and 39.81 mM trolox equivalents (TE) g-1 , respectively). Superfine grinding also improved the water-absorption capacity of RP powders under a high-RH environment. CONCLUSION: Superfine grinding is a promising technique for the production of RP powders with stronger bioactive substances and bioactivity.