Comparison of chlorogenic acid content in different kinds of tea

OBJECTIVE To find out the contents and distributing charaters of chlorogenic acid in tea from different enviroment and different kinds.To discuss the relationship between chlorogenic acid levels and producing processes.METHODSThe separation was performed on a Gemini C18 column(150 mm×4.6 mm,5 μm) with mobile phase of 0.1% H3PO4-acetonitril–triethylamine(92:8:0.1).The detection wavelength was 323 nm.RESULTSChlorogenic acid could be detected in all kinds of tea(0.01-0.40 mg·g-1).But the contents were different depending on the origin and producing processes.The contents of chlorogenic acid from high to low was:kuding teagreen teayellow teawhite teaflower teablue teablack teadark tea.In terms of producing area,tea from north area of the Yangtse river had the highest level,followed by the southern of Yangtse river southwest of Chinasouthern China.CONCLUSIONThe content of chlorogenic acid is diverse correlated with the place of produce as well as the producing technology of tea.