用大孔氨甲基聚苯乙烯树脂选择性吸附分离茶多酚和咖啡因  

SELECTIVE ADSORPTION AND SEPARATION OF TEA POYPHENOLS AND CAFFEINE

作　　者：杨文泓[1] 赵长青[1] 高杰[1] 汤海燕[1] 程绍玲[1] 阎虎生[1] 

机构地区：[1]功能高分子材料教育部重点实验室南开大学高分子化学研究所,天津300071

出　　处：《离子交换与吸附》2007年第6期481-488,共8页Ion Exchange and Adsorption

基　　金：国家自然科学基金资助项目(20374028)

摘　　要：3种市售树脂ADS-5、ADS-8和ADS-17对茶多酚和咖啡因的混合物水溶液的吸附表明,具有弱极性的ADS-8对茶多酚的吸附量最大。随着树脂极性的增加(ADS-5<ADS-8<ADS-17),从混合物中对茶多酚的选择性吸附作用增加,表明对茶多酚的吸附可能包含疏水作用和氢键,而对咖啡因的吸附为疏水作用。在此基础上,合成了不同交联度(8%～26%DVB)的大孔氨甲基聚苯乙烯树脂,这些树脂具有疏水基质和可与酚类化合物形成较强氢键的氨基。对茶多酚和咖啡因的混合物溶液的吸附表明,这些树脂对茶多酚具有高吸附量和高吸附选择性。交联度为10%的大孔氨甲基聚苯乙烯树脂对茶多酚具有最大的吸附量,交联度为22%的大孔氨甲基聚苯乙烯树脂对茶多酚具有最大的吸附选择性。The adsorption of tea polyphenols and caffeine from their mixture in aqueous solution by three commercially available polymeric adsorbents, ADS-5, ADS-8 and ADS-17, was studied. The adsorption capacity of polyphenols by ADS-8, a weak polar adsorbent, was highest among the three adsorbents. Adsorption selectivity of polyphenols from the mixture solution increased with the polarity increasing of the three adsorbents （ADS-5〈ADS-8〈ADS-17）. These results indicated that the driven forces for the adsorption of polyphenols may include hydrophobic interaction and hydrogen bonding, while the adsorption of caffeine was driven by hydrophobic interaction alone. Based on the studies above, macroporous aminomethyl polystyrnene resins with various crooslinking degrees （8%-26% DVB） were synthesized. The resins contain hydrophobic matrix and amino groups which can form strong hydrogen bonds with phenol hydroxyl groups＇. The adsorption of the mixture of polyphenols and caffeine in aqueous solution indicated that these resins had much higher adsorption capacities and selectivity for polyphenols. The macroporous aminomethyl polystyrnene resin with 10% crooslinking degree had highest adsorption capacity and that with 22% crooslinking degree had highest adsorption selectivity for polyphenols.

关 键 词：吸附树脂 疏水作用 氢键 荼多酚 咖啡因 

分 类 号：O647.3[理学—物理化学]