壳聚糖膜中添加柠檬酸和甘油作为活性包装材料，以延长绿辣椒的货架期。
Chitosan film incorporated with citric acid and glycerol as an active packaging material for extension of green chilli shelf life.
机构信息
Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur, 247001 U.P., India.
Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur, 247001 U.P., India.
出版信息
Carbohydr Polym. 2018 Sep 1;195:329-338. doi: 10.1016/j.carbpol.2018.04.089. Epub 2018 Apr 24.
Chitosan films with cross linker and plasticizer were prepared using solvent casting method for food packaging application. Citric acid was used as the cross linker which enhances the stability of the films. Glycerol was used as plasticizer which imparts flexibility. Successful cross linking was confirmed by Fourier Transform-Infra Red (FT-IR) spectra and incorporation of glycerol was seen clearly in the Field Emission Scanning Electron Microscope (FE-SEM) images. The modified films show an improved water resistance and transparency. An improved moisture barrier was also observed with a 5.5% and 29% reduction in water vapor transmission and water vapor permeability, respectively. Modified films showed drastic 12 times increase in the elongation percentage value, hence enhanced flexibility. However, the tensile strength and Young's modulus decreased substantially by 82% and 98%, respectively. The films also showed better thermal and antioxidant properties as compared to neat chitosan films and were found to enhance green chilli shelf life.
采用溶剂浇铸法制备了带有交联剂和增塑剂的壳聚糖薄膜，用于食品包装应用。柠檬酸用作交联剂，增强了薄膜的稳定性。甘油用作增塑剂，赋予了薄膜柔韧性。傅里叶变换红外（FT-IR）光谱证实了成功的交联，并且在场发射扫描电子显微镜（FE-SEM）图像中清楚地看到了甘油的掺入。改性后的薄膜具有更好的耐水性和透明度。水蒸气传输和水蒸气透过率分别降低了 5.5%和 29%，观察到了更好的水分阻隔性能。改性后的薄膜的断裂伸长率值增加了 12 倍，因此柔韧性得到了显著提高。然而，拉伸强度和杨氏模量分别大幅下降了 82%和 98%。与纯壳聚糖薄膜相比，这些薄膜还具有更好的热稳定性和抗氧化性能，有助于延长绿辣椒的货架期。
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