聚乳酸改性树脂活性包装薄膜中活性成分的释放及在三文鱼冷藏保鲜中的应用

Release of active components in polylactic acid-modified resin active packaging film and its application in cold storage of salmon

中文关键词:  聚乳酸  香芹酚  百里香酚  改性树脂  三文鱼  保鲜

英文关键词:polylactic acid  carvacrol  thymol  modified resin  salmon  preservation

中文摘要:

      目的 研究聚乳酸(polylactic acid, PLA)改性树脂活性包装薄膜的抗菌特性, 膜中活性成分在模拟液中的释放, 及其在三文鱼的冷藏保鲜中的应用。方法 以PLA、丁二酸丁二醇酯-己二酸丁二醇酯共聚物(butanediol succinate-butylene adipate, PBSA)为基材, 4%香芹酚+4%百里香酚为活性成分, 通过双螺杆挤出机共混造粒、流延机制备薄膜, 考察薄膜中活性成分的模拟释放过程及在4±1 ℃冷藏条件下对三文鱼包装保鲜的效果。结果 香芹酚和百里香酚的添加提升了改性PLA薄膜的抗菌性能; 薄膜中香芹酚和百里香酚在95%乙醇模拟液中的释放量最大, 并且两者在不同模拟液中的扩散系数基本和模拟液中的实际释放情况相吻合; 其应用于新鲜三文鱼冷藏保鲜时, 改性PLA活性包装薄膜包装三文鱼的菌落总数(total viable counts, TVC)、挥发性盐基总氮值(total volatile basic nitrogen, TVBN)均显著低于空白组(P＜0.05)。结论 在(4±1) ℃冷藏条件下, PLA/PBSA活性包装薄膜可有效延缓三文鱼的腐败变质, 保鲜效果更明显, 可延长三文鱼货架期3~4 d。

英文摘要:

      Objective To study the antibacterial properties of polylactic acid (PLA) modified resin active packaging films, the release of the active ingredients in the film in simulated fluid, and its application in the cold storage of salmon. Methods With PLA, butanediol succinate-butylene adipate (PBSA) as the base material, 4% carvone+4% thymol as active ingredient, films were prepared by twin screw extruder blending granulation and casting machine. The simulated release process of the active ingredients in the film and the preservation effect of salmon packaging were investigated under refrigeration conditions of (4±1) ℃. Results The addition of carvacrol and thymol increased the antibacterial properties of the modified PLA film; the released of carboxilol and thymol in the 95% ethanol simulated solution were the most, and the diffusion coefficient in the different simulated liquids were basically consistent with the actual release in the simulated liquid. When applied to the cold preservation of salmon, the total viable counts (TVC) and total volatile basic nitrogen (TVBN) of the modified PLA-active packaging film were significantly lower than those of the blank group (P<0.05). Conclusion Under the condition of (4±1) ℃, PLA/PBSA active packaging film can effectively delay the spoilage of salmon, the preservation effect is more obvious, and it can prolong the shelf life of salmon for 3-4 d.