Literature DB >> 23729856

Comparative studies on the physicochemical and antioxidant properties of different tea extracts.

Haixia Chen1, Yu Zhang, Xueming Lu, Zhishuang Qu.   

Abstract

Tea is one of the most popular drinks next to water. Tea polyphenol is one of the main bioactive constituents of tea with health functions. In order to find the most bioactive tea polyphynols, polyphenol extracts from green tea, black tea and chemical oxidation products of green tea extracts were comparatively studied on the physicochemical and antioxidant properties. Results showed physicochemical and antioxidant properties of polyphenol extracts changed greatly after the chemical oxidation. Hydrogen peroxide induced oxidation products (HOP) possessed the highest antioxidant ability among the four tea polyphenol extracts. Thirteen phenolic compounds and one alkaloid in HOP were identified by reversed phase high-performance liquid chromatography coupled to diode array detection and electrospray ionization mass spectrometry (RP-HPLC-DAD-ESI-MS). Hydrogen peroxide induced oxidation of tea polyphenol extracts could improve the antioxidant activity and could be used to produce antioxidants for food industry.

Entities:  

Keywords:  Antioxidant activity; Comparative studies; HPLC-MS; Physicochemical properties; Tea polyphenols

Year:  2011        PMID： 23729856      PMCID： PMC3614050          DOI： 10.1007/s13197-011-0291-6

Source DB:  PubMed          Journal:  J Food Sci Technol        ISSN： 0022-1155            Impact factor:   2.701


  12 in total

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4.  Evaluation of the antioxidant and pro-oxidant effects of tea catechin oxypolymers.

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Journal:  J Agric Food Chem       Date:  2000-12       Impact factor: 5.279

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6.  Identification of ellagic acid conjugates and other polyphenolics in muscadine grapes by HPLC-ESI-MS.

Authors:  Joon-Hee Lee; Jodie V Johnson; Stephen T Talcott
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8.  Antioxidant activity of the phenol rich fractions of leaves of Chukrasia tabularis A. Juss.

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  11 in total

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10.  Epigallocatechin-3-gallate (EGCG) inhibits imiquimod-induced psoriasis-like inflammation of BALB/c mice.

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