Oxidation characteristics of catechins in suspended fermentation of different varieties' tea leaves
文献类型： 外文期刊
作者： Shen, Xiaoyan 1 ; Wu, Xiaofen 1 ; Qi, Hui 1 ; Wei, Dongning 1 ; Deng, Ming 1 ; Wang, Keqin 1 ; Liu, An 1 ; Chen, Liang 1 ;
作者机构： 1.Hunan Acad Agr Sci, Hunan Inst Nucl Agr Sci & Space Breeding, Changsha 410125, Peoples R China
2.Hunan Univ, Coll Biol, Longping Branch, Changsha 410082, Peoples R China
关键词： Black tea; Suspended fermentation; Oxidation characteristics; Catechins; Theaflavins; SII thearubigins (SII-TRs)
期刊名称：JOURNAL OF FOOD COMPOSITION AND ANALYSIS （ 影响因子：4.0； 五年影响因子：4.1 ）
ISSN： 0889-1575
年卷期： 2024 年 135 卷
页码：
收录情况： SCI
摘要： This study focused on the efficiency of enzymatic synthesis for theaflavins (TFs) and SII types of thearubigins (SIITRs) in suspended fermentation of different varieties of tea leaves. The results showed that the content of catechins in tea variety-Xiaoxianghong 21-3 (XXH21-3) was the highest among the five kinds of fresh tea leaves, and it had the strongest ability of transforming catechins to TFs and SII-TRs. The total amount of catechins for XXH 21-3 decreased rapidly and the conversion ratio of TFs reached the highest level of 13.96 % after 20 min, the residual catechins was the lowest (3.27 %) and the conversion rate of SII-TRs was the highest (13.02 %) after 120 min during the suspended fermentation of five varieties tea leaves. Among six types of catechins, epicatechin gallate (ECG), epigallocatechin gallate (EGCG) and epigallocatechin (EGC) were consumed in large quantities, and the residues were all less than 5 % in the final stage of fermentation, of which ECG consumption was the fastest, followed by EGCG. These results demonstrated that the concentration of catechins and PPO activities were positively correlated with the formation of TFs and SII-TRs, POD activity was positive correlation with synthesis of SII-TRs and negative correlation with TFs.
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