Column chromatography was adopted to isolate catechins and caffeine in crude polyphenols with the macroporous adsorption resin. Results showed that the capability of adsorption and desorption was very good between the resin and polyphenols,catechins and caffeine could be isolated with gradient elution,a series products of catehins and crude caffeine were gained. Furthermore,the product of high-pure catechins(GTC-90) could be obtained in which E...