Department of Chemistry, Karnatak Science College, Dharwad 580 001, Karnataka, India.
Department of Chemistry, Karnatak Science College, Dharwad 580 001, Karnataka, India.
Int J Biol Macromol. 2023 Mar 31;232:123499. doi: 10.1016/j.ijbiomac.2023.123499. Epub 2023 Jan 31.
Vanillic acid incorporated chitosan/poly(vinyl alcohol) active films were prepared by employing a cost-effective solvent casting technique. FTIR investigation validated the intermolecular interaction and formation of Schiff's base (C=N) between functional groups of vanillic acid, chitosan, and poly(vinyl alcohol). The addition of vanillic acid resulted in homogenous and dense morphology, as confirmed by SEM micrographs. The tensile strength of active films increased from 32 to 59 MPa as the amount of vanillic acid increased and the obtained values are more significant than reported polyethylene (2231 MPa) and polypropylene (31-38 MPa) films, widely utilized in food packaging. Active film's UV, water, and oxygen barrier properties exhibited excellent results with the incorporation of vanillic acid. Around 40 % of degradation commences within 15 days. Synergistic impact against S. aureus, E. coli, and C. albicans pathogens caused the expansion of the inhibition zone, evidenced by the excellent antimicrobial activity. The highest antioxidant capacity, 73.65 % of CPV-4 active film, proved that active films could prevent the spoilage of food from oxidation. Green chillies packaging was carried out to examine the potential of prepared active films as packaging material results in successfully sustaining carotenoid accumulation and prolonging the shelf life compared to conventional polyethylene (PE) packaging.
采用经济有效的溶剂浇铸技术制备了香草酸接枝壳聚糖/聚乙烯醇活性薄膜。傅里叶变换红外光谱（FTIR）研究验证了香草酸、壳聚糖和聚乙烯醇的功能基团之间的分子间相互作用和希夫碱（C=N）的形成。SEM 显微照片证实，添加香草酸后形成了均匀且致密的形态。随着香草酸用量的增加，活性膜的拉伸强度从 32 MPa 增加到 59 MPa，而获得的值比广泛用于食品包装的聚乙烯（2231 MPa）和聚丙烯（31-38 MPa）膜更为显著。活性膜的 UV、水和氧气阻隔性能在加入香草酸后表现出优异的效果。约 40%的降解在 15 天内开始。金黄色葡萄球菌、大肠杆菌和白色念珠菌病原体的协同作用导致抑菌圈扩大，证明了其优异的抗菌活性。CPV-4 活性膜的最高抗氧化能力为 73.65%，这表明活性膜可以防止食品因氧化而变质。进行了绿辣椒包装实验，以检验所制备的活性膜作为包装材料的潜力，结果表明与传统的聚乙烯（PE）包装相比，活性膜可以成功地促进类胡萝卜素的积累并延长货架寿命。
