文献类型：期刊文献

英文题名：Adsorption Characteristics of (-)-Epigallocatechin Gallate and Caffeine in the Extract of Waste Tea on Macroporous Adsorption Resins Functionalized with Chloromethyl, Amino, and Phenylamino Groups

作者：Liu, Yongfeng[1,2,4];Bai, Qingqing[1,2,5];Lou, Song[1,2,4];Di, Duolong[1,2,3];Li, Jintian[5];Guo, Mei[5]

第一作者：Liu, Yongfeng

通信作者：Di, DL[1]

机构：[1]Chinese Acad Sci, Lanzhou Inst Chem Phys, Key Lab Chem NW Plant Resources, Lanzhou 730000, Peoples R China;[2]Chinese Acad Sci, Lanzhou Inst Chem Phys, Key Lab Nat Med Gansu Prov, Lanzhou 730000, Peoples R China;[3]Chinese Acad Sci, Ctr Resource Chem & New Mat, Lanzhou Inst Chem Phys, Qingdao 266100, Peoples R China;[4]Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China;[5]Gansu Coll Tradit Chinese Med, Dept Pharm, Lanzhou 730000, Peoples R China

第一机构：Chinese Acad Sci, Lanzhou Inst Chem Phys, Key Lab Chem NW Plant Resources, Lanzhou 730000, Peoples R China

通信机构：[1]corresponding author), Chinese Acad Sci, Lanzhou Inst Chem Phys, Key Lab Chem NW Plant Resources, 18 Tianshui Middle Rd, Lanzhou 730000, Peoples R China.

年份：2012

卷号：60

期号：6

起止页码：1555

外文期刊名：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

收录：;EI(收录号：20120814787376);Scopus(收录号：2-s2.0-84863118557);WOS:【SCI-EXPANDED(收录号:WOS:000300213300029)】；

基金：This research project was financially supported by the National Natural Sciences Foundation of China (NSFC No. 20974116) and the "Hundred Talents Program" of the Chinese Academy of Sciences (CAS).

语种：英文

外文关键词：(-)-Epigallocatechin gallate; caffeine; waste tea; macroporous adsorption resin; adsorption isotherm; adsorption kinetics

摘要：According to the Friedel-Crafts and amination reaction, a series of macroporous adsorption resins (MARs) with novel structures were synthesized and identified by the Brunauer-Emmett-Teller (BET) method and Fourier transform infrared (FTIR) spectra, and corresponding adsorption behaviors for (-)-epigallocatechin gallate (EGCG) and caffeine (CAF) extracted from waste tea were systemically investigated. Based on evaluation of adsorption kinetics, the kinetic data were well fitted by pseudo-second-order kinetics. Langmuir, Freundlich, Temkin-Pyzhev, and Dubinin-Radushkevich isotherms were selected to illustrate the adsorption process of EGCG and CAF on the MARs. Thermodynamic parameters were adopted to explain in-depth information of inherent energetic changes associated with the adsorption process. The effect of temperature on EGCG and CAF adsorption by D101-3 was further expounded. Van der Waals force, hydrogen bonding, and electrostatic interaction were the main driving forces for the adsorption of EGCG and CAF on the MARs. This study might provide a scientific reference point to aid the industrial large-scale separation and enrichment of EGCG from the extracts of waste tea using modified MARs.