Abstract: The absorption and desorption behaviors of seven macroporous resins for polyphenols from Koelreuteria paniculata Laxm. were investigated. The 24h static adsorption capacity and desorption rate of AB-8 resin was 13.74mg/g and 98.35%, respectively. The static adsorption and desorption equilibrium time of AB-8 resin was both less than 3h. The optimum conditions of dynamic absorption and desorption by AB-8 were sample mass concentration 4g/L, sample pH value 6, and volume fraction of ethanol 60%, elution speed 1mL/min, respectively.Under these conditions, the adsorption rate was 88.21% and desorption rate was 89.91%.The purity of polyphenols from Koelreuteria paniculata Laxm. increased from 50.36% to 72.37% after purification using AB-8 resin and the recovery rate was 86.83%.

Key words: polyphenols of Koelreuteria paniculata Laxm. Leaves, purification, macroporous resin