Supramolecular interaction-enhanced green active packaging films: Design and performance of Ca2+-crosslinked carboxymethyl chitosan composite films
文献类型： 外文期刊
作者： Wang, Cheng 1 ; Yu, Hao 1 ; Bu, QiHang 1 ; Wang, ZiHan 1 ; Jiang, Ning 1 ; Chen, JiaoYang 2 ; Sun, RongXue 1 ; Liu, QianYuan 1 ; Xu, JianHua 2 ; Fu, JiaJun 2 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Prod Proc, Nanjing 210014, Peoples R China
2.Nanjing Univ Sci & Technol, Sch Chem & Chem Engn, Nanjing 210094, Peoples R China
关键词： Carboxymethyl chitosan; Coordination cross-linking; Active packaging films
期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）
ISSN： 0141-8130
年卷期： 2025 年 309 卷
页码：
收录情况： SCI
摘要： Given the environmental challenges caused by petroleum-based plastics, this study developed a novel green carboxymethyl chitosan (CMCS)-based active packaging composite film (CP) through a synergistic strategy of precise Ca2+ coordination cross-linking and small-molecule plasticizing. Based on this strategy, the CP-4.5 film (CaCl2: 7 wt%, DL-3-phenyllactic acid (3-PLA): 4.5 wt%) exhibited exceptional mechanical properties, including high flexibility (Young's modulus: 0.747 GPa; elongation at break: 65.2 %) and high toughness (18.4 MJ m(-3)). The incorporation of CaCl2 not only occupied voids within the CP film but also increased the physical crosslinking strength and density of the polymer network. This structural reorganization impeded the diffusion of O-2 and H2O molecules, reducing oxygen permeability by 85.9 % and water vapor permeability by 57.6 %. Additionally, 3-PLA, functioning as a broad-spectrum antibacterial agent, imparted the CP film with superior antibacterial activity. The CP film exhibited recyclability and repairability, and underwent complete biodegradation within 56 days. Overall, the synergistic effect of CaCl2 and 3-PLA endowed the CP film with superior mechanical properties, barrier properties, antimicrobial activity, and environmental sustainability, effectively mitigating the quality deterioration of refrigerated grass carp fillets during storage, demonstrating the promising potential of the CP film for food packaging applications.
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