壳聚糖/活性白土糖用复合脱色剂的制备及其吸附特性研究  

Preparation and Adsorption Properties of Chitosan/Active Clay Composite as Sugar Juice Decolorization Agent

作　　者：黄承都[1,2] 艾硕 刘纯友 任仙娥 张昆明[1,2] 黄永春 HUANG Chengdu;AI Shuo;LIU Chunyou;REN Xian’e;ZHANG Kunming;HUANG Yongchun(Guangxi Key Laboratory of Green Processing of Sugar Resources(Guangxi University of Science and Technology),Liuzhou 545006,China;Province and Ministry Co-sponsored Collaborative Innovation Center of Sugarcane and Sugar Industry,Nanning 530004,China)

机构地区：[1]广西糖资源绿色加工重点实验室(广西科技大学),广西柳州545006 [2]蔗糖产业省部共建协同创新中心,广西南宁530004

出　　处：《食品工业科技》2022年第8期76-84,共9页Science and Technology of Food Industry

基　　金：广西自然科学基金联合资助培育项目(2018GXNSFAA138107);广西高等学校高水平创新团队及卓越学者计划资助项目(桂教人[2014]7号)。

摘　　要：以活性白土和壳聚糖制备壳聚糖/活性白土复合脱色剂,糖汁脱色效果作为评价指标,分别考察制备过程中反应温度、反应时间、壳聚糖添加量、壳聚糖分子量等因素对其脱色效果的影响,获得最佳条件为:反应温度为60℃,反应时间为7 h,壳聚糖添加量为2.0 g,壳聚糖分子量为200万。该复合物的糖汁脱色率最高可达96.2%,明显优于活性白土的56.7%和壳聚糖的42.2%。通过扫描电镜、红外光谱、X射线衍射和热失重分析仪对其进行结构表征,结果证明壳聚糖较均匀分布于活性白土的表面,形成了较为稳定的复合结构,并保持活性白土多孔隙结构,其热稳定性较壳聚糖的高。该复合物对糖汁中没食子酸的吸附实验表明,其吸附动力学符合准二级动力学模型,吸附速率受颗粒外扩散过程的控制,其吸附行为符合Langmuir等温吸附模型,为单分子层吸附。Chitosan/activated clay composite was prepared with chitosan solution and activated clay.With the decolorization ratio of sugar juice as an index,the effects of reaction temperature,reaction time,chitosan dosage and molecular weight on the preparation of chitosan/activated clay composite were investigated.The optimum conditions were obtained as follows:temperature 60℃,reaction time 7 h,chitosan dosage 2.0 g and molecular weight 2,000,000.The decolorization rate of the composite was up to 96.2%,which was significantly better than 56.7% of activated clay and42.2% of chitosan.The decolorization rate of the structure of the composite was characterized by scanning electron microscopy,infrared spectroscopy,X-ray diffraction and thermogravimetric analysis.The results showed that chitosan was evenly distributed on the surface of activated clay,forming a more stable composite structure and maintaining the porous structure of activated clay.The thermal stability of the composite was higher than that of chitosan.The adsorption experiment of gallic acid in sugar juice showed that the adsorption kinetics of the composite conformed to the quasi second order kinetic model,the adsorption rate was controlled by the diffusion process outside the particles,and the adsorption process conformed to the Langmuir isothermal adsorption model,which was monolayer adsorption.

关 键 词：壳聚糖/活性白土 糖汁脱色剂 脱色率 结构表征 吸附性能 

分 类 号：TS202.3[轻工技术与工程—食品科学]