College of Food Science and Engineering, Shandong Agricultural University, Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an, Shandong Province 271018, China.
College of Food Science and Engineering, Shandong Agricultural University, Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an, Shandong Province 271018, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 1):126609. doi: 10.1016/j.ijbiomac.2023.126609. Epub 2023 Aug 29.
With increasing awareness on environmental protection and food safety, the development of biodegradable antimicrobial packaging materials has been paid growing emphasis. In this work, starch/poly(butylene adipate-co-terephthalate)/ε-polylysine hydrochloride films were prepared by extrusion blowing, and five commercial organically modified nanomontmorillonites (OMMT, including DK1, DK2, DK3, DK4, and DK5) were used as reinforcing agents. Intercalated structures were formed in the nanocomposite films, especially for those with DK3 and DK4 owing to their higher hydrophobicity and larger interlayer spacing. Adding OMMT weakened hydrogen bonds and the gelatinization/plasticization degree of starch. Morphology analysis revealed that the agglomeration of OMMT occurred in the films, but the film containing DK3 still showed a relatively homogeneous microstructure. Loading OMMT enhanced the strength, deformation resistance, thermal stability, surface hydrophobicity, but decreased barrier properties and water sensitivity of the films. Antimicrobial activity showed that the OMMT and ε-polylysine hydrochloride possessed a synergistic effect against Staphylococcus aureus and Escherichia coli. The maximum inhibition rate was observed in that with DK4, approaching 100 %. Findings supported the application of commercial OMMT in manufacturing biodegradable antimicrobial blown films.
随着人们对环境保护和食品安全意识的提高，可生物降解的抗菌包装材料的开发受到了越来越多的关注。本工作采用挤出吹塑法制备了淀粉/聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯）/ε-聚赖氨酸盐酸盐薄膜，并使用了五种商业有机改性蒙脱土（OMMT，包括 DK1、DK2、DK3、DK4 和 DK5）作为增强剂。在纳米复合材料薄膜中形成了插层结构，特别是对于那些疏水性更高、层间距更大的 DK3 和 DK4 而言。添加 OMMT 削弱了淀粉的氢键和胶凝/塑化程度。形貌分析表明，OMMT 在薄膜中发生了团聚，但含有 DK3 的薄膜仍表现出相对均匀的微观结构。添加 OMMT 提高了薄膜的强度、变形阻力、热稳定性、表面疏水性，但降低了其阻隔性能和对水的敏感性。抗菌活性表明，OMMT 和 ε-聚赖氨酸盐酸盐对金黄色葡萄球菌和大肠杆菌具有协同作用。在含有 DK4 的薄膜中观察到最大的抑制率，接近 100%。研究结果支持将商业 OMMT 应用于制造可生物降解的抗菌吹塑薄膜。
