Abstract

Developed the new technique to modify cotton fiber by esterification with citric acid, the reaction was carried out in the tight flask and applied argon as anti-burning reagent. The optimum condition was 170oC, 5h and 3g of citric acid per 2g of cotton fiber, which result was up to 0.88 mol citric acid grafted on 1 mol glucose. The modified cotton fiber thereafter was applied to purify epigallocatechin gallate (EGCG) and epicatechin gallate (ECG) from green tea polyphenol by column chromatography with the suitable mobile phase.