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壳聚糖基超大孔规整介质的制备及分离茶多酚 预览

Preparation of chitosan based supermacroporous continuous medium and separation of tea polyphenols
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摘要 提出采用变温冷冻法制备壳聚糖基超大孔规整分离介质,并用于茶叶中茶多酚的吸附与分离。介质的制备工艺将壳聚糖交联反应、致孔、成型于1步操作完成,整体成型于分离柱中,介质孔隙率85%~90%,孔隙范围100~700μm,可直接从茶叶浸取液中富集茶多酚。以茶多酚的吸附量和脱附率为指标,得出该超大孔规整介质对茶多酚的吸附和解吸操作参数为:吸附液流速为0.70mL/min、吸附温度为25℃、pH为4.5~5.0;解吸液用80%乙醇水溶液,流速为0.90 mL/min、用量为5BV,温度为40℃。该超大孔规整介质的最大吸附量为256.4mg/g,茶多酚脱附率为76%,茶多酚的平均提取率可以达到12.3%,纯度为96.5%。该制备方法摒弃壳聚糖基吸附介质常采用冷冻干燥进行致孔来获取多孔型分离介质,可以取代传统散装吸附树脂用于茶多酚的吸附分离。 Chitosan based supermacroporous continuous separation medium was prepared by variable temperature freezing method and used for the adsorption and separation of tea polyphenols from tea. The cross-linking reaction,pore forming and molding of chitosan gel were completed in one step. The porosity of the medium was 85% ~ 90% and the pore range was 500 ~ 1000μm. Based on the adsorption capacity and desorption ratio of tea polyphenols,the adsorption and desorption parameters of the supermacroporous continuous medium for tea polyphenols were obtained as follows :the flow rate of the adsorption solution was 0.70 mL/min,the adsorption temperature was 25℃,the pH was 4.5 ~ 5.0;the desorption solution was 80% ethanol aqueous solution,the flow rate was 0.90 mL/min,the dosage was 5 BV,and the temperature was 40℃. The maximum adsorption capacity of the supermacroporous continuous medium was 256.4 mg/g,the desorption ratio of tea polyphenols was 76%,the average extraction rate of tea polyphenols was 12.3%,and the purity was 96.5%. The preparation method abandons freeze drying method to obtain chitosan-based porous adsorption medium. The porosity of the separation medium is uniform. It can replace the traditional bulk adsorbent resin for the adsorption and separation of tea polyphenols.
作者 李大刚 袁淑芳 陈崇城 陈晓玲 李云龙 LI Da-gang;YUAN Shu-fang;CHEN Chong-cheng;CHEN Xiao-ling;LI Yun-long(Department of Materials and Chemical Engineering,Quanzhou 362000;Applied Technology Engineering Center of Fujian Provincial Higher Education for Practical Chemical Material,Quanzhou 362000)
出处 《中国食品添加剂》 CAS 2019年第3期81-86,共6页 China Food Additives
基金 福建省高校杰出青年科研人才培育计划专项(jytjq20170605) 福建省中青年教师教育科研项目(JAT160836).
关键词 连续介质 传质 分离 茶多酚 壳聚糖 continuous medium mass transfer separation tea polyphenols chitosan
作者简介 李大刚(1983-),男,硕士,主要从精细化学品合成研究。E-mail:lidagang@lmu.edu.cn。
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