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Journal of Tea Science ›› 2015, Vol. 35 ›› Issue (3): 281-289.doi: 10.13305/j.cnki.jts.2015.03.011

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Formation Mechanism of TSs and Competitive Formation Between TSs and TFs under Various pH

XU Bin1,2, JIANG Heyuan1,*, ZHANG Jianyong1, YANG Liuyan1,2, LIU Qianlu1,2   

  1. 1.Tea Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tea Plants Biology and Resources Utilization of Agriculture Ministry, Key Laboratory of Tea Processing Engineering of Zhejiang Province, Hangzhou 310008, China;
    2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2014-12-05 Revised:2015-02-18 Online:2015-06-15 Published:2019-08-23

Abstract: To illustrate the formation mechanism of theasinensins (TSs) and the competitive formation between TSs and theaflavins (TFs), catechins((EGCG, EGC, EC and ECG) were oxidized to form TSs monomers or TFs monomers by enzymatic oxidation and the experiments were performed by liquid fermentation under different pH values. The results showed that the TSs monomers were synthesized and accumulated continuously under acidic conditions, while the peaks of TSs monomers appeared in a short time but showed poor stability under neutral or alkaline conditions. Due to the magnitudes of the oxidation reduction potential (ORP) are variable for catechins, the enzymatic oxidative rates of catechins are different under different pH conditions. For the reason that there was a competition between the formation of TSs and TFs: the content of TSs monomers transformed by EGCG and EGC was higher than TFs monomers under the neutral condition or pH=6, however, conversely under the condition pH=5.

Key words: catechin, theasinensins, theaflavins, formation mechanism, competitiveness

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