双层
明胶
材料科学
聚乙烯醇
化学工程
涂层
乙烯醇
壳聚糖
增塑剂
作者
Seyed Fakhreddin Hosseini,Forouzan Kaveh,Markus Schmid
标识
DOI:10.1016/j.foodchem.2022.132540
摘要
• Bilayer film of PLA and chitosan/polyvinyl alcohol/fish gelatin (CPF) were prepared. • SEM images showed a perfect uniformity of the CPF coatings on the PLA surfaces. • The OP is reduced to 0.238 cm 3 mm/m 2 day bar, ca 122 times lower than that of PLA film. • Active PLA/CPF bilayer films were effective against four major food-borne pathogens. • Active bilayer showed a highly encouraging radical scavenging activity close to 32% Poly(lactic acid) (PLA) has been intended as an encouraging biopolymer for packaging purposes. Nevertheless, PLA-based films suffer from low gas barrier properties, which restrict their applications. Here, we report a facile fabrication of multi-component coating via layer deposition of cinnamaldehyde (CIN)-doped chitosan/poly(vinyl alcohol)/fish gelatin (CPF) on PLA surfaces. Different PLA/CPF ratios (100:0, 77.5:22.5, 55:45, 32.5:67.5, and 0:100) were tested, whereas the PLA55:CPF45 was selected for loading of CIN. The surface and morphology analyses of the bilayers verify that CPF layers are successfully coated on the PLA surfaces. This design improved the mechanical strength and water barrier of CPF films and simultaneously enhanced the ductility of PLA films. By deposition of CIN-doped CPF layer on a PLA substrate, the oxygen permeability decreased from 28.92 to 0.238 cm 3 mm/m 2 day bar, approximately 122 times lower than that of bare PLA. CIN loadings in the CPF layer endowed bilayer films with antioxidant/antimicrobial activity.
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