College of Food Science and Engineering, Shandong Agricultural University, Tai'an, Shandong Province, 271018, China.
College of Management, Ocean University of China, Qingdao, Shandong Province, 266100, China.
Food Chem. 2024 Mar 15;436:137650. doi: 10.1016/j.foodchem.2023.137650. Epub 2023 Oct 2.
Antimicrobial biodegradable packaging is in high demand as a one-two punch against microbiological and plastic hazards. Two quaternary ammonium salts (QAS) with different N-alkyl chain lengths were used for starch/poly (butylene adipate-co-terephthalate) (PBAT) blown antimicrobial films. Dioctadecyl dimethyl ammonium chloride (D1821) contributed to a homogeneous film morphology at 5% w/w level, while micro-pores occurred with didodecyl dimethyl ammonium chloride (D1221). Increasing QAS content weakened hydrogen bonding interactions. D1821 promoted the formation of intercalated structure of nano-clays, and improved the strength, thermal stability, barrier, and surface hydrophobicity of the films. Conversely, adding D1221 decreased the mechanical properties, and significantly enhanced the surface hydrophilicity. The films with 3% and 5% w/w D1221 obviously inhibited the growth of both Staphylococcus aureus and Escherichia coli, while those with D1821 cannot show clear zone against the Gram-negative. 5% w/w D1221-loaded film delayed the growth of microorganisms in beef, of which the total viable count was 5.75 lg CFU/g after 21-day chilling storage. Findings supported that QAS had the potential for manufacturing starch/PBAT antimicrobial packaging, but the release kinetics and cytotoxicity still need to be systematically explored before application.
抗菌可生物降解包装作为对抗微生物和塑料危害的“双拳组合”受到高度需求。两种具有不同 N-烷基链长度的季铵盐（QAS）被用于淀粉/聚（丁二酸丁二醇酯-对苯二甲酸酯）（PBAT）抗菌吹塑薄膜。在 5%w/w 水平下，双十八烷基二甲基氯化铵（D1821）有助于形成均匀的薄膜形态，而二癸基二甲基氯化铵（D1221）则会产生微孔。增加 QAS 含量会削弱氢键相互作用。D1821 促进纳米粘土的插层结构形成，提高了薄膜的强度、热稳定性、阻隔性和表面疏水性。相反，添加 D1221 会降低力学性能，并显著提高表面亲水性。添加 3%和 5%w/w D1221 的薄膜明显抑制了金黄色葡萄球菌和大肠杆菌的生长，而添加 D1821 的薄膜则不能对革兰氏阴性菌显示明显的抑菌圈。添加 5%w/w D1221 的薄膜能够延缓牛肉中微生物的生长，在 21 天冷藏储存后，其总活菌数为 5.75 lg CFU/g。研究结果表明，QAS 具有制造淀粉/PBAT 抗菌包装的潜力，但在应用之前，仍需要系统地研究其释放动力学和细胞毒性。
