Study on the main biochemical components of white tea stored at different years
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摘要: 研究了不同年份白茶的主要生化成分含量。结果表明:白茶在储存过程中,较短年限时,茶叶中茶多酚、咖啡碱、游离氨基酸、可溶性糖含量降低幅度比较小,变化不大,但储藏时间较长时,均呈下降趋势;白茶中儿茶素组分均以表没食子儿茶素没食子酸酯(EGCG)和表儿茶素没食子酸酯(ECG)为主,含量较高,茶叶陈放两年后,儿茶素总量下降的速度显著,陈20年白茶儿茶素组分及其总量含量极少;陈年白茶黄酮含量均比当年白茶的黄酮含量高,陈20年白茶黄酮含量极显著高于其它年份的白茶。Abstract: The contents of the main biochemical components of white tea stored at different years were determined and analyzed.Results showed that as the stored time prolonged, the contents of tea polyphenols, caffeine, total amino and soluble sugar showed a slight decrease, which was still falling overall trend.In the different years of white tea, the main components of catechins were EGCG and ECG.After two years ' storage, the content of catechins were decreased rapidly, and there had few catechins in the 20 years white tea.The content of flavonoids was increased in the process of the white tea storage, a significant difference of flavonoids content were observed between the 20 years and other years' white tea.
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Keywords:
- white tea /
- storage period /
- biochemical components /
- analysis /
- content
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