多酚
超滤(肾)
化学
吸附
洗脱
色谱法
溶解度
咖啡因
萃取(化学)
有机化学
医学
内分泌学
抗氧化剂
作者
Ping Li,Yanhui Wang,Rong Ma,Xiaolin Zhang
标识
DOI:10.1016/j.jfoodeng.2004.04.009
摘要
A process for isolating tea polyphenol and caffeine from Green Tea Leaves using extraction with water, followed by ultrafiltration with a CA–Ti composite ultrafiltration membrane, adsorption by PA resin and finally elution by a mixed solvent system has been developed. After ultrafiltration with the CA–Ti composite ultrafiltration membrane, a product with a tea polyphenol content of more than 40% was obtained. After adsorption on the resin and elution with mixed solvents, a purified product containing more than 90% of tea polyphenol was obtained. A modified gel polarization model for the ultrafiltration process has been proposed and a new method for selection of eluting agents by application of solubility parameters has been devised and shown to be very effective.
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