西番莲果皮不溶性膳食纤维对金属离子的吸附特性  

Characteristics of metallic ion adsorption on insolubledietary fiber from passion peel

作　　者：周崇银 李晗 范方宇 马歆芳[1] 陈小涛 ZHOU Chongyin;LI Han;FAN Fangyu;MA Xinfang;CHEN Xiaotao(School of Life Sciences,Southwest Forestry University,Kunming 650224,China;Key Laboratory of Forest Disaster Warning and Control of Yunnan Province,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学生命科学学院,云南昆明650224 [2]西南林业大学,云南省森林灾害预警与控制重点实验室,云南昆明650224

出　　处：《食品与发酵工业》2022年第14期160-167,共8页Food and Fermentation Industries

基　　金：西南林业大学科研启动金;云南省“万人计划”青年拔尖人才专项资助(YNWR-QNBJ-2018-046)。

摘　　要：以西番莲果皮为原料,制备西番莲不溶性膳食纤维(passion peel insoluble dietary fiber,PIDF),研究PIDF对金属离子的吸附特性。模拟肠胃环境,以PIDF为吸附剂,以Cu^(2+)、Pb^(2+)和Cd^(2+)为吸附质,研究PIDF量、反应时间和金属离子浓度对吸附过程的影响,并分析吸附等温线和动力学特征。结果表明,模拟肠胃环境中,PIDF对Cu^(2+)、Pb^(2+)和Cd^(2+)的吸附均在30 min后达到平衡。肠环境的平衡吸附量分别为8.751、9.106、10.778 mg/g,平衡吸附率分别为40.822%、44.845%、55.814%;胃环境的平衡吸附量分别为4.852、5.014、1.846 mg/g,平衡吸附率分别为24.201%、24.807%、9.273%。随着金属离子浓度增加,PIDF对金属离子的吸附量增大,吸附率减小;随着PIDF含量增大,吸附量减小,吸附率增大。吸附等温线和动力学分析表明,PIDF对金属离子的吸附是多分子层吸附;吸附行为符合准二级动力学模型(R^(2)>0.99),吸附速率受液膜扩散和内扩散控制,且后者是主要控速步骤。In this study,the passion peel insoluble dietary fiber(PIDF)was prepared from passion peels,and its adsorption characteristics for Cu^(2+),Pb^(2+) and Cd^(2+) were studiedin the simulated intestines and stomach.The effects of the PIDF content and reaction time,and metal ion concentrationwere studied through adsorptionexperiments.Meanwhile,the adsorption isotherms and kinetics characteristicswere analyzed.The results showed that the adsorption of Cu^(2+),Pb^(2+) and Cd^(2+) by the PIDF reached equilibrium after 30 min in the simulated intestines and stomach.The equilibrium adsorption capacity of Cu^(2+),Pb^(2+) and Cd^(2+) by the PIDF in the simulated intestines were 8.751,9.106 and 10.778 mg/g,and the absorption rate were 40.822%,44.845%and 55.814%,respectively.Moreover,the equilibrium adsorption capacity of Cu^(2+),Pb^(2+) and Cd^(2+) by the PIDF in the simulated stomach were 4.852,5.014 and 1.846 mg/g and the adsorption rate were 1.846 mg/g,and 24.201%,24.807%and 9.273%,respectively.With the increase of metal ions concentration,the adsorption capacity of the PIDF to the metal ions increased,andthe adsorption rate decreased.The adsorption capacity of the PIDF to the metal ionsdecreased with the increase of PIDF content,and the adsorption rate increased.The adsorption isotherms and kinetics indicated that the adsorption of metal ions bythe PIDF was the multi-molecular layer adsorption.The adsorptionbehavior conformed to the pseudo-second-order kinetic model(R^(2)>0.99).The adsorption rate was controlled by liquid film diffusion and intraparticle diffusion,and the intraparticle diffusion was rate-controlling step.

关 键 词：西番莲果皮 不溶性膳食纤维 金属离子 吸附动力学 等温吸附模型 

分 类 号：TS209[轻工技术与工程—食品科学]