食品模拟体系中淀粉基膜材增塑剂迁移的动力学模型  

Kinetic Modeling of Plasticizer Migration from Starch-based Film in Food Simulants

作　　者：朱杰[1] 李晓玺[2] 李琳[2] 

机构地区：[1]东莞理工学院化学与环境工程学院,广东东莞523808 [2]华南理工大学轻工与食品学院,华南理工大学淀粉与植物蛋白深加工教育部工程研究中心,广东省天然产物绿色加工与产品安全重点实验室,广东广州510640

出　　处：《现代食品科技》2016年第9期141-146,259,共7页Modern Food Science and Technology

基　　金：国家自然科学基金资助项目(31401586,21376095)

摘　　要：本文以高取代度酯化淀粉为基材、以三乙酸甘油酯为增塑剂制备了淀粉基膜材。以热重分析技术(TGA)分析了膜材与食品模拟体系接触后增塑剂的变化情况,在此基础上对用增塑剂向食品体系的迁移过程进行了整体动力学分析和扩散模型分析。结果表明,在与淀粉基膜材亲和性较低的4%乙酸体系中,增塑剂的整个迁移过程更符合整体一级动力学,增塑剂短期迁移过程遵循菲克第二扩散定律,而后续的迁移遵循非菲克扩散定律;在与淀粉基膜材具有更高亲和性的65%乙醇和正己烷体系中,增塑剂迁移遵循非菲克扩散定律,且长期迁移更显著。以上结果说明,基于食品模拟体系与膜材的亲和性差异,增塑剂通过溶胀层向食品模拟体系的迁移呈现不同的动力学特点,且因膜材/模拟体系相互作用的影响而改变。Esterified starch, with a high degree of substitution, and triacetin were used as the matrix and the plasticizer, respectively, to prepare a starch-based film. Thermogravimetric analysis（TGA） was employed to detect the changes in plasticizer content in the starch-based films when the film was exposed to different food simulants. The migration of plasticizer from the starch-based film was analyzed using the overall kinetic and the diffusion models. The results indicated that in 4% acetic acid system with a weak affinity towards the starch-based film, the whole plasticizer migration obeyed first-order kinetics; the short-term plasticizer migration obeyed the Fick＇s second law; and the following migration obeyed the non-Fickian model of diffusion. In 65% aqueous ethanol and n-hexane systems with a stronger affinity towards starch-based films, the plasticizer migration did not obey the Fick＇s law and the effect was more obvious for the long-term migration. Collectively, the results indicated that because of the different affinities between food simulants and film matrix, the plasticizer migration through the swelling layer towards food simulants exhibited different kinetic characteristics, which changed due to the effect of the interaction between films and simulant systems.

关 键 词：淀粉基膜材 增塑剂 迁移 动力学模型 

分 类 号：TS236[轻工技术与工程—粮食、油脂及植物蛋白工程]