Diblan Sevgin, Gökkaya Erdem Burcu, Kaya Sevim
Department of Food Engineering, Faculty of Engineering, Adana Alparslan Türkeş Science and Technology University, 01250 Adana, Turkey.
Department of Food Engineering, Engineering Faculty, Gaziantep University, 27310 Gaziantep, Turkey.
J Food Sci Technol. 2020 Oct;57(10):3708-3719. doi: 10.1007/s13197-020-04403-8. Epub 2020 Apr 13.
The active multilayer packaging films were formed from low-density polyethylene (LDPE) and polyamide containing a 2% antimicrobial agent in one of the LDPE sides of the film (LDPE/polyamide/LDPE-2% antimicrobial agent). The antimicrobial agents used were potassium sorbate (PS-film), nisin (N-film), or chitosan (CTS-film). The effects of antimicrobial incorporation on water vapor permeability (), diffusivity ( ), and solubility ( and ) of the active and control films (LDPE/polyamide/LDPE) were investigated. A dynamic vapor sorption analyzer (DVS) was used to estimate the sorption isotherms of the films at 25 °C. Peleg was found to be the best equation to describe sorption behaviors. The addition of PS and nisin into the film matrix resulted in a lower than that of the control film. The values of the active films were lower than those of control films, except for the CTS-film. The high water-holding capacity of PS and nisin might limit the of the respective films. It was found that Henry's law was applicable to relate , , and and values of the multilayer film [correlation coefficient (r) = 0.909-0.971]. The mechanical and thermal properties of the active films were not significantly affected by the incorporation of PS and nisin (p > 0.05). However, the impact of stress and elongation (transverse direction) on the CTS-film was lower than on other films, which indicated that chitosan improved the mechanical properties of the film.
活性多层包装薄膜由低密度聚乙烯（LDPE）和聚酰胺制成，在薄膜的其中一个LDPE面含有2%的抗菌剂（LDPE/聚酰胺/LDPE-2%抗菌剂）。使用的抗菌剂为山梨酸钾（PS薄膜）、乳酸链球菌素（N薄膜）或壳聚糖（CTS薄膜）。研究了抗菌剂的添加对活性薄膜和对照薄膜（LDPE/聚酰胺/LDPE）的水蒸气透过率（）、扩散系数（ ）和溶解度（ 和 ）的影响。使用动态蒸汽吸附分析仪（DVS）来估计薄膜在25°C时的吸附等温线。发现Peleg方程是描述吸附行为的最佳方程。向薄膜基质中添加PS和乳酸链球菌素导致的 低于对照薄膜。除CTS薄膜外，活性薄膜的 值低于对照薄膜。PS和乳酸链球菌素的高持水能力可能限制了各自薄膜的 。发现亨利定律适用于关联多层薄膜的 、 、 和 值[相关系数（r）=0.909 - 0.971]。PS和乳酸链球菌素的添加对活性薄膜的机械性能和热性能没有显著影响（p＞0.05）。然而，应力和伸长率（横向）对CTS薄膜的影响低于对其他薄膜的影响，这表明壳聚糖改善了薄膜的机械性能。
