萧鹏漫 吴进莲 杨建星 刘泳希 朱杰

摘要 [目的]研究不同加热方式下，淀粉基膜材的结构变化和增塑剂迁移情况，为新型淀粉基膜材在食品包装中的应用提供参考。[方法]以蒸馏水体系为热加工介质，采用沸水加热和微波加热，对淀粉基膜材进行热加工处理并分析加热过程中膜材表层增塑剂迁移、总迁移及膜材基体质量和结构变化。[结果]沸水加热和微波加热均加剧了淀粉基膜材表面增塑剂的迁移，淀粉高分子片段溶出，膜材内部产生高分子聚集，促使膜材总体迁移增大；当增塑剂含量较低时，2种热加工处理后的膜材断面形成了更加明显的孔洞结构。另外，相比于沸水加热，微波加热较高的瞬时功率促使膜材表层增塑剂迁移、总迁移程度更大。[结论]不同的热传递模式导致淀粉基膜材结构变化与分子迁移存在差异。

关键词 淀粉基膜材；热加工；增塑剂迁移；结构变化

Structure Changes and Plasticizer Migration of Starch-based Films during Thermal Process

XIAO Peng-man，WU Jin-lian，YANG Jian-xing，ZHU Jie* et al （School of Chemical Engineering and Energy Technology，Dongguan University of Technology，Dongguan，Guangdong 523808）

Abstract [Objective] To provide references for practical application of starch-based food packaging materials，migration behavior and structure changes were studied in starch-based films treated by thermal processing.[Method]Boiling water，microwave and distilled water were chosen to be the heating method and food simulant system，respectively，modern technologies were prepared to investigate the migration of surface plasticizer，total migration，changes on the mass of matrix and morphology of fractured surface of starch-based films.[Result] The results indicated that thermal processing promoted plasticizer migration of the surface layer，dissolution and aggregation of starch molecular accelerated the total migration.Moreover，more pore structures were in the starch-based films with lower plasticizer content.Compared with boiling water treatment，plasticizer migration and total migration were more severe by microwave. [Conclusion] Based on the results above，the structure changes and molecular migration in the starch-based film were diverse with two thermal deliveries.

Key words Starch-based film；Thermal process；Plasticizer migration；Structure changes

隨着人们全球性能源危机意识的提高和对生态环境恶化的日益关注，以淀粉基膜材为代表的环境友好型生物可降解包装材料的研究和开发逐渐增强[1-2]。增塑剂是新型包装材料必不可少的加工助剂，有助于提高膜材的机械性能和阻隔性能，保证膜材具有良好的包装性能[3]。然而，当包装材料与食品体系接触后，增塑剂不可避免地发生迁移，一方面直接影响食品品质甚至产生食品安全问题，另一方面也会改变膜材的结构和使用性能[4-5]。

食品在加热过程中，包装材料由于受热也会产生一些变化，同时食品体系中的成分进入包装材料，也会影响包装材料的完整性[6]。……