Wang Xiumei, Chen Yibin, Zhao Xiaoxu, Pang Jie
College of Environmental and Biological Engineering, Putian University, Putian 351100, China.
Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, Putian University, Putian 351100, China.
Foods. 2025 Apr 29;14(9):1563. doi: 10.3390/foods14091563.
The effects of stearic acid (SA) and lauric acid (LA) with different concentrations on the structure and physicochemical properties of konjac glucomannan (KGM)/chitosan (CTS)/Zein (KCZ) film were systematically investigated in this paper. The rheology results suggested that the apparent viscosity of the KCZ film solution was significantly enhanced after adding fatty acids (FAs), and all the film-forming solutions were typical non-Newtonian pseudoplastic fluids. Hydrogen bond interactions were formed among KGM, CTS, Zein, and FA molecules. KCZ-FA films had higher crystallinities than KCZ film, and their crystallinities increased with the increase in FA concentrations. Microstructure indicated that adding FAs significantly affected the surface morphologies and roughness of KCZ film. KCZ-LA films exhibited much rougher surfaces than KCZ-SA films when FA concentrations were the same. Moreover, the incorporation of FAs significantly ( < 0.05) decreased the transmittance of KCZ film. KCZ-FA films exhibited higher hydrophobicities and water vapor barrier properties than KCZ film due to their significantly ( < 0.05) higher water contact angle, lower water solubility, water content, and vapor permeability values. The thermal stabilities, color attributes, and mechanical properties of KCZ film were also improved after adding appropriate concentrations of FA. Therefore, KCZ-FA films with excellent performances are promising food packaging materials in the future.
本文系统研究了不同浓度的硬脂酸（SA）和月桂酸（LA）对魔芋葡甘聚糖（KGM）/壳聚糖（CTS）/玉米醇溶蛋白（KCZ）膜结构和理化性质的影响。流变学结果表明，添加脂肪酸（FAs）后，KCZ膜溶液的表观粘度显著提高，且所有成膜溶液均为典型的非牛顿假塑性流体。KGM、CTS、玉米醇溶蛋白和FA分子之间形成了氢键相互作用。KCZ-FA膜的结晶度高于KCZ膜，且其结晶度随FA浓度的增加而增加。微观结构表明，添加FAs显著影响了KCZ膜的表面形貌和粗糙度。当FA浓度相同时，KCZ-LA膜的表面比KCZ-SA膜粗糙得多。此外，FAs的加入显著（<0.05）降低了KCZ膜的透光率。由于KCZ-FA膜的水接触角显著（<0.05）更高、水溶性、含水量和透气率值更低，因此其疏水性和水蒸气阻隔性能比KCZ膜更高。添加适当浓度的FA后，KCZ膜的热稳定性、颜色属性和机械性能也得到了改善。因此，具有优异性能的KCZ-FA膜有望成为未来的食品包装材料。
