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- W2964112003 endingPage "1495" @default.
- W2964112003 startingPage "1474" @default.
- W2964112003 abstract "Tea is a typical processed beverage from the fresh leaves of Camellia sinensis [Camellia sinensis (L.) O. Kuntze] or Camellia assamica [Camellia sinensis var. assamica (Mast.) Kitamura] through different manufacturing techniques. The secondary metabolites of fresh tea leaves are mainly flavan-3-ols, phenolic acids, purine alkaloids, condensed tannins, hydrolysable tannins, saponins, flavonols, and their glycoside forms. During the processing, tea leaves go through several steps, such as withering, rolling, fermentation, postfermentation, and roasting (drying) to produce different types of tea. After processing, theaflavins, thearubigins, and flavan-3-ols derivatives emerge as the newly formed compounds with a corresponding decrease in concentrations of catechins. Each type of tea has its own critical process and presents unique chemical composition and flavor. The components among different teas also cause significant changes in their biological activities both in vitro and in vivo. In the present review, the progress of tea chemistry and the effects of individual unit operation on components were comprehensively described. The health benefits of tea were also reviewed based on the human epidemiological and clinical studies. Although there have been multiple studies about the tea chemistry and biological activities, most of existing results are related to tea polyphenols, especially (-)-epigallocatechin gallate. Other compounds, including the novel compounds, as well as isomers of amino acids and catechins, have not been explored in depth." @default.
- W2964112003 created "2019-07-30" @default.
- W2964112003 creator A5036062527 @default.
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- W2964112003 creator A5052677421 @default.
- W2964112003 creator A5059702655 @default.
- W2964112003 creator A5074742029 @default.
- W2964112003 date "2019-07-24" @default.
- W2964112003 modified "2023-10-17" @default.
- W2964112003 title "Chemistry and Biological Activities of Processed <i>Camellia sinensis</i> Teas: A Comprehensive Review" @default.
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