Study on the main biochemical components of white tea stored at different years

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.