明胶
纳米纤维
壳聚糖
聚乳酸
静电纺丝
傅里叶变换红外光谱
材料科学
单宁酸
抗菌活性
化学工程
核化学
高分子化学
活性包装
抗氧化剂
极限抗拉强度
化学
纳米技术
食品包装
有机化学
聚合物
复合材料
食品科学
细菌
工程类
生物
遗传学
作者
Saqib Gulzar,Mohamed Tagrida,Krisana Nilsuwan,Thummanoon Prodpran,Soottawat Benjakul
标识
DOI:10.1016/j.foodhyd.2022.107916
摘要
Electrospinning of gelatin/chitosan solutions incorporated with tannic acid (TA) and chitooligosaccharides (COS) at varying levels was performed on polylactic acid (PLA) films at a constant voltage of 20 kV with a feed rate of 0.5 mL/h. Nanofibers of gelatin/chitosan were incorporated with TA and COS as the sources of antioxidant and antimicrobial agents. SEM images revealed that the gelatin/chitosan nanofibers (GC-NF) had diverse morphologies and diameters. The concentration of TA and COS had prominent effect on the morphology of the nanofibers. Bead-free and smooth nanofibers were formed at higher TA and COS levels. PLA films coated with GC-NF showed high antioxidant activity, especially at higher levels of TA and COS incorporated. The films also exhibited antibacterial activity against both gram positive and gram negative bacteria. Selected GC-NF coated PLA films, having high antioxidant and antibacterial activities, were studied for mechanical and barrier properties. Water vapor permeability (WVP), tensile strength and elongation at break (EAB) of GC-NF coated PLA films were found to be improved when compared to PLA film. Moreover, light transmission of GC-NF coated PLA films was reduced and the films were cloudy in appearance. Characteristic peaks of functional groups in gelatin and chitosan were identified in the GC-NF coated PLA films using Fourier transform infrared (FTIR) spectroscopy. Overall, PLA film coated with GC-NF incorporated with TA and COS, could be a potential active packaging alternative for food applications.
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