Wu Xinye, Wang Haiying, Zhou Yuan, Xi Wei, Zhang Yiqin, Li Shanshan, Tang Jiaying, Li Suqing, Zhang Qing, Liu Yaowen, Li Jingming, Chen Mingrui, Qin Wen
College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
Sichuan Advanced Agricultural & Industrial Institute, China Agricultural University, Chengdu 611430, China.
Foods. 2025 Jun 6;14(12):2015. doi: 10.3390/foods14122015.
Carboxymethyl chitosan (CMCS) exhibits excellent film-forming capability but suffers from limited water resistance. To enhance hydrophobicity and antimicrobial properties, citrus essential oil was emulsified directly with citrus pectin and dispersed into the CMCS matrix. This study investigated the effects of varying emulsion concentrations (0, 1, 3, 5, and 7 wt%) on film performance. FT-IR, XRD, and SEM analyses confirmed uniform emulsion distribution within the CMCS matrix with favorable compatibility. Increased emulsion loading improved water resistance, antioxidant activity, and antimicrobial efficacy of the CMCS-based films, with the 3% emulsion concentration achieving optimal mechanical strength (TS: 4.09 MPa, EAB: 144.47%) and water vapor permeability (1.30 × 10 g·m·(Pa·s·m)). Applied to grape preservation, the films significantly delayed quality deterioration of grapes. Furthermore, by modulating the activity of enzymes involved in anthocyanin metabolism, the films could effectively extend the shelf life of grapes by suppressing the oxidative degradation of anthocyanins.
羧甲基壳聚糖（CMCS）具有优异的成膜能力，但耐水性有限。为了提高疏水性和抗菌性能，将柑橘精油与柑橘果胶直接乳化并分散到CMCS基质中。本研究考察了不同乳液浓度（0、1、3、5和7 wt%）对薄膜性能的影响。傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和扫描电子显微镜（SEM）分析证实乳液在CMCS基质中分布均匀且相容性良好。增加乳液负载量可提高基于CMCS的薄膜的耐水性、抗氧化活性和抗菌效果，3%的乳液浓度实现了最佳机械强度（拉伸强度：4.09 MPa，断裂伸长率：144.47%）和水蒸气透过率（1.30×10 g·m·(Pa·s·m)）。应用于葡萄保鲜时，这些薄膜显著延缓了葡萄的品质劣变。此外，通过调节参与花青素代谢的酶的活性，这些薄膜可以通过抑制花青素的氧化降解有效地延长葡萄的货架期。
