College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, PR China.
College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, PR China.
Int J Biol Macromol. 2019 Aug 1;134:11-19. doi: 10.1016/j.ijbiomac.2019.05.042. Epub 2019 May 7.
The antioxidant and antimicrobial food packaging films were prepared by using chitosan (CS) and proanthocyanidins (PA). Effect of PA content (0, 5, 10, 15 and 20 wt% of PA on CS basis) on the physical, antioxidant and antimicrobial properties of CS-based films were determined. The prepared CS-PA films showed a brown color. PA incorporation remarkably increased the thickness, water solubility, water vapor permeability, opacity, tensile strength and thermal stability of CS film; whereas significantly reduced the moisture content, oxygen permeability, UV-vis light transmittance, elongation at break and crystallinity of CS film. Scanning electron microscopy showed PA was evenly distributed in the CS film matrix, making the films more compact. Some spontaneous agglomeration of PA was observed in the films when PA contents exceeded 5 wt%. Infrared spectra indicated the intermolecular interactions between PA and CS were through hydrogen bonds. Notably, CS-PA films exhibited improved antioxidant and antimicrobial activity in comparison with plain CS film. Our results suggested CS-PA films could be applied as active packaging materials in food industry.
采用壳聚糖（CS）和原花青素（PA）制备了抗氧化和抗菌食品包装膜。确定了 PA 含量（PA 占 CS 基础的 0、5、10、15 和 20wt%）对 CS 基膜物理性能、抗氧化和抗菌性能的影响。制备的 CS-PA 膜呈棕色。PA 的掺入显著增加了 CS 膜的厚度、水溶性、水蒸气透过率、不透明度、拉伸强度和热稳定性；而显著降低了 CS 膜的水分含量、氧气透过率、紫外-可见透光率、断裂伸长率和结晶度。扫描电子显微镜显示 PA 均匀分布在 CS 膜基质中，使膜更加致密。当 PA 含量超过 5wt%时，观察到 PA 发生自发团聚。红外光谱表明 PA 与 CS 之间存在分子间相互作用，通过氢键。值得注意的是，与普通 CS 膜相比，CS-PA 膜表现出更好的抗氧化和抗菌活性。我们的结果表明，CS-PA 膜可作为食品工业中的活性包装材料。
