Gas Permeability and Permselectivity of Poly(L-Lactic Acid)/SiO_x Film and Its Application in Equilibrium-Modified Atmosphere Packaging for Chilled Meat

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• 作者：Tungalag Dong ; Shuxin Song ; Min Liang ; Yu Wang ; Xiaojing Qi ; Yuqin Zhang ; Xueyan Yun and Ye Jin
• 刊名：Journal of Food Science
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：82
• 期：1
• 页码：97-107
• 全文大小：1430K
• ISSN：1750-3841

文摘

A layer of SiO_x was deposited on the surface of poly(L-lactic acid) (PLLA) film to fabricate a PLLA/SiO_x layered film, by plasma-enhanced chemical vapor deposition (PECVD) process. PLLA/SiO_x film showed Young's modulus and tensile strength increased by 119.2% and 91.6%, respectively, over those of neat PLLA film. At 5 °C, the oxygen (O₂) and carbon dioxide (CO₂) permeability of PLLA/SiO_x film decreased by 78.7% and 71.7%, respectively, and the CO₂/O₂ permselectivity increased by 32.5%, compared to that of the neat PLLA film. When the PLLA/SiO_x film was applied to the equilibrium-modified atmosphere packaging of chilled meat, the gas composition in packaging reached a dynamic equilibrium with 6% to 11% CO₂ and 8% to 13% O₂. Combined with tea polyphenol pads, which effectively inhibited the microbial growth, the desirable color of meat was maintained and an extended shelf life of 52 d was achieved for the chilled meat.