羧甲基纤维素
材料科学
涂层
活性包装
聚合物
壳聚糖
极限抗拉强度
化学工程
食品包装
纤维素
纳米技术
复合材料
化学
食品科学
工程类
冶金
钠
作者
Zohreh Riahi,Jong‐Whan Rhim,Reza Bagheri,Gholamreza Pircheraghi,Ensieh Lotfali
标识
DOI:10.1016/j.porgcoat.2022.106794
摘要
A chitosan-based carbon quantum dots (CQDs) with multifunctional properties were synthesized using a hydrothermal process. The CQDs were spherical with an average size of 7.8 ± 2.4 nm. The CQD showed strong antioxidant activity, potent antibacterial activity against E. coli and L. monocytogenes, and antifungal activity against A. niger and P. chrysogenum. In addition, the prepared CQD showed negligible cytotoxicity against L929 cells even at a concentration of 500 μg/mL. Carboxymethyl cellulose (CMC)-based functional films were fabricated by adding various amounts of CQD. The CQDs were evenly dispersed in the polymer matrix to form a highly transparent UV-blocking film. The addition of CQD increased the tensile strength (TS) (by up to 27.6%) and elastic modulus (EM) (by up to 61.5%) of the CMC film. The CQD-added CMC films showed excellent antioxidant and strong antimicrobial activity. Lemon fruits were coated with the film solutions to test the efficacy of the CQD-added CMC film. The lemon coated with CMC/CQD film showed an excellent appearance without mold growth even after 21 days of storage. The CMC/CQD coating film with superior functional properties has great potential in active food packaging applications.
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