文献类型：期刊文献

中文题名：单功能化壳聚糖对刺梨果汁单宁及色素吸附的研究

英文题名：Decolorization and tannin removal efficiency of Rosa roxburghii Tratt juice with monofunctional chitosan

作者：李小红 曾民鑫 周良春

第一作者：李小红

机构：[1]贵州理工学院;[2]成都产品质量检验研究院有限责任公司

第一机构：贵州理工学院

年份：2018

卷号：43

期号：8

起止页码：176-183

中文期刊名：食品科技

外文期刊名：Food Science and Technology

收录：北大核心:【北大核心2017】；

基金：贵州省科学技术基金计划项目(黔科合LH字[2016]7094);创客空间项目(筑科合同[20151001]2-7号);大学生创新创业项目(201714440072;201714440071);贵州省科技计划项目(黔科合基础[2017]1073)

语种：中文

中文关键词：beta-环糊精-6-壳聚糖;刺梨;脱色;单宁;吸附等温线

外文关键词：beta-CS-CD;Rosa roxburghii Tratt;tannin;adsorption isotherm;adsorption kinetics

摘要：为有效脱除刺梨果汁中的单宁和色素,提高刺梨果汁品质,选用beta-环糊精、壳聚糖及beta-环糊精修饰的功能化壳聚糖对刺梨果汁进行脱色和脱单宁处理。结果表明:与未做修饰的beta-环糊精、壳聚糖相比,修饰后的beta-环糊精-6-壳聚糖吸附效果最好,当beta-环糊精-6-壳聚糖用量0.09 g、吸附时间120 min、吸附温度35℃时脱色率为89.2%,单宁脱除率为69.3%。且其吸附等温线符合Langmuir和Freundlich方程,直线的相关系数R^2均大于0.98,Langmuir拟合参数qm=32.61 mg/g,10~3×K_L=52.85 L/mg,Freundlich拟合参数n=2.00,K_F=3.611。beta-CS-CD吸附剂处理后刺梨果汁中可溶性固形物、可滴定酸和Vc保留率分别为81.2%、81.9%和94.2%,总糖和多酚含量分别显著下降至75.6%和61.3%。因此,beta-CS-CD吸附剂能够有效脱除刺梨果汁中的单宁和色素类物质并改善其品质。
In order to effectively remove the tannin and pigment present in Rosa roxburghii Tratt juice and improve its quality, three kinds of adsorbent including beta-CS-CD, beta-CD and CS were studied. Results showed that beta-CS-CD exhibited the best absorption performance and the removal rate of pigment and tannin. Moreover, the absorption isotherm of beta-CS-CD, beta-CD and CS were fitted to the Langmuir and Freundlich equations. The linear correlation coefficients R2 were greater than 0.98. The pigment and tannin fitting parameter of Langmuir of beta-CS-CD were qm =32.61 mg/g, 10^3xKL=52.85 L/ mg, respectively. The pigment and tannin fitting parameter of Freundlich of beta-CS-CD were n =2.00, KF=3.611, n=1.18, KF=1.53, respectively. The results indicated that the introduction of beta-CD functional group could greatly increase the adsorption efficiency. Kinetic studies showed that the adsorption was fast and the adsorption process followed a pseudo-first-order kinetic model. We also find that for beta- CS-CD the adsorption kinetic rate constant （k2） value was much larger on beta-CD and CS. These results clearly indicate that the introduction of CD increases not only the adsorption capacity and intensity but also the adsorption rate of chlorophenol. Therefore, beta-CS-CD was effective to remove tannin and pigment from Rosa roxburghfi Trattjuice and therefore could improve its quality.