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首页> 外文期刊>Journal of Polymers and the Environment >Chitosan/Hydrophilic Plasticizer-Based Films: Preparation, Physicochemical and Antimicrobial Properties
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Chitosan/Hydrophilic Plasticizer-Based Films: Preparation, Physicochemical and Antimicrobial Properties

机译：壳聚糖/亲水增塑剂基薄膜：制备，理化和抗菌性能

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The addition of plasticizers to biopolymer films is a good method for improving their physicochemical properties. The aim of this study was to evaluate the effect of chitosan (CHI) blended with two hydrophilic plasticizers glycerol (GLY) and sorbitol (SOR), at two concentrations (20 and 40 wt%) on their mechanical, thermal, barrier, structural, morphological and antimicrobial properties. The chitosan was prepared through the alkaline deacetylation of chitin obtained from fermented lactic from shrimp heads. The obtained chitosan had a degree of deacetylation (DA) of 84 ± 2.7 and a molecular weight of 136 kDa, which indicated that a good film had formed. The films composed of CHI and GLY (20 wt%) exhibited the best mechanical properties compared to the neat chitosan film. The percentage of elongation at break increase to over 700 % in the films that contained 40 % GLY, and these films also exhibited the highest values for the water vapor transmission rate (WVTR) of 79.6 ± 1.9 g m~2 h~(-1) and a yellow color (b_0= 17.9 ± 2.0) compared to the neat chitosan films (b_0= 8.8 ± 0.8). For the structural properties, the Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction analyses revealed an interaction in the acetam-ide group and changes in the crystallinity of plasticized films. The scanning electron micrographs revealed that all formulations of the chitosan films were smooth, and that they did not contain aggregations, pores or microphase separation. The thermal analysis using differential scanning calorimetry (DSC) revealed a glass transition temperature (Tg) of 130℃ for neat chitosan film, but the addition of SOR or GLY elicited a decrease in the temperature of the peak (120℃). In addition, the antimicrobial activity of the chitosan films was evaluated against Listeria monocytog-enes, and reached a reduction of 2 log after 24 h. The plasticizer concentration of 20 % GLY is sufficient for obtaining flexible chitosan films with good mechanical properties, and it could serve as an alternative as a packaging material to reduce environmental problems associated with synthetic packaging films.
机译：向生物聚合物薄膜中添加增塑剂是改善其物理化学性质的好方法。这项研究的目的是评估两种浓度（20和40 wt％）的壳聚糖（CHI）与两种亲水性增塑剂甘油（GLY）和山梨糖醇（SOR）混合对其机械，热，阻隔，结构，形态和抗菌特性。壳聚糖是通过从虾头发酵的乳酸中获得的几丁质进行碱性脱乙酰作用制备的。所得壳聚糖的脱乙酰度（DA）为84±2.7，分子量为136kDa，表明形成了良好的膜。与纯壳聚糖膜相比，由CHI和GLY（20 wt％）组成的膜表现出最佳的机械性能。含40％GLY的薄膜的断裂伸长率增加到700％以上，这些薄膜的水蒸气透过率（WVTR）最高，为79.6±1.9 gm〜2 h〜（-1）与纯壳聚糖薄膜（b_0 = 8.8±0.8）相比，颜色为黄色（b_0 = 17.9±2.0）。对于结构特性，傅里叶变换红外光谱（FTIR）和X射线衍射分析显示了乙酰胺基团之间的相互作用以及增塑膜的结晶度变化。扫描电子显微镜照片显示，壳聚糖膜的所有配方都是光滑的，并且不包含聚集，孔或微相分离。使用差示扫描量热法（DSC）进行的热分析表明，纯壳聚糖膜的玻璃化转变温度（Tg）为130℃，但是添加SOR或GLY引起峰温度（120℃）降低。此外，评估了壳聚糖膜对单核细胞增生李斯特菌的抗菌活性，并在24小时后降低了2 log。 20％GLY的增塑剂浓度足以获得具有良好机械性能的柔性壳聚糖薄膜，并且可以用作包装材料的替代品，以减少与合成包装膜相关的环境问题。

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