茶学文献20201226

The profile of dynamic changes in yellow tea quality and chemical composition during yellowing process
闷黄过程中黄茶质量和化学成分的动态变化概况
闷黄是生产独特黄茶的关键过程,但闷黄对茶品质和化学成分的影响尚不清楚。在这里,电子眼,舌和代谢组学首次用于研究闷黄过程中茶叶的动态变化。在闷黄的前18小时内,观察到茶叶的颜色变为淡黄色。与鲜味和甜味有关的化合物(氨基酸,儿茶素,蔗糖,酚酸等)含量很高。但是,闷黄24小时后,茶的颜色变深,茶的浸入度显着下降。大多数儿茶素,氨基酸,酚酸和糖苷结合的挥发物(GBV)的水平显着下降,而甜菜碱,哌啶,茶青素B和溶血磷脂酰胆碱(LPC)则显着增加。同时,根据偏最小二乘(PLS)分析,大多数氨基酸和蔗糖与鲜味和甜度呈正相关。大多数儿茶素和酚酸与苦味和涩味呈正相关。萤光素与茶叶颜色的红色值(+ a *)正相关。这项工作为黄茶在闷黄过程中的质量和化学变化提供了全面,新颖的知识。

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