Abstract: Theanine and tea polyphenols were purified from the extract of green tea with ZJL macroporous cation resin column followed by ZJX macroporous adsorption resin column chromatography,at the same time caffeine was removed effectively.The optimal operating conditions were obtained through static and dynamic state experiments.Extraction yield and purity of theanine were 0.94% and 85.43%,respectively.Yield and purity of tea polyphenols were (12.35%) and 95.62%,respectively,and the content of caffeine in tea polyphenols product was less than 0.8%.

Key words: tea polyphenols, theanine, combinated-purification resin