Novel bionanocomposite films were prepared by combining konjac glucomannan/surface deacetylated chitin nanofibers (KGM/S-ChNFs) with different concentrations of citric acid (CA) (10%–25%) via a solution casting method. The effect of CA-induced crosslinking on the rheological behavior of film-forming solutions (FFS) as well as the structural and physicochemical properties of the resulting bionanocomposite films were evaluated. The results revealed that the increased CA loadings increased the shear viscosity of FFS. Fourier transform infrared spectra and scanning electron microscopy results confirmed the successful crosslinking between CA and S-ChNFs. The addition of 20 wt% CA was defined as the optimal condition, resulting in minimum water sensitivity and permeability, while maintaining a good combination of tensile strength and antimicrobial properties. This work supported the conclusion that CA crosslinking was an effective pathway for the preparation of polysaccharide-based bionanocomposite films with improved properties, which may be a promising material for active food packaging applications.

中文翻译：

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柠檬酸交联魔芋葡甘露聚糖/表面脱乙酰甲壳素纳米纤维生物纳米复合膜的制备与表征


通过溶液浇铸法将魔芋葡甘露聚糖/表面脱乙酰甲壳素纳米纤维 （KGM/S-ChNFs） 与不同浓度的柠檬酸 （CA） （10%–25%） 混合，制备新型生物纳米复合薄膜。评价了 CA 诱导的交联对成膜溶液 （FFS） 流变行为的影响以及所得生物纳米复合薄膜的结构和物理化学性质。结果表明，增加的 CA 载荷增加了 FFS 的剪切黏度。傅里叶变换红外光谱和扫描电子显微镜结果证实了 CA 和 S-ChNFs 之间的成功交联。添加 20 wt% CA 被定义为最佳条件，从而实现最小的水敏感性和渗透性，同时保持拉伸强度和抗菌性能的良好组合。这项工作支持了 CA 交联是制备具有改进性能的多糖基生物纳米复合薄膜的有效途径，这可能是活性食品包装应用的有前途的材料。