Preparation and characterization of multifunctional konjac glucomannan/carboxymethyl chitosan biocomposite films incorporated with epigallocatechin gallate
Preparation and characterization of multifunctional konjac glucomannan/carboxymethyl chitosan biocomposite films incorporated with epigallocatechin gallate
复制标题
表没食子儿茶素没食子酸酯多功能魔芋葡甘聚糖/羧甲基壳聚糖生物复合膜的制备及表征
DOI：
10.1016/j.foodhyd.2020.105756
复制
发表时间：
2020-08-01
影响因子：
10.7
通讯作者：
Wu, Chunhua
中科院分区：
文献类型：
--
作者：
Sun, Jishuai;Jiang, Haixin;Wu, Chunhua
采用溶液浇铸法制备了不同表没食子儿茶素没食子酸酯（EGCG）浓度（0%、5%、10%、15%和20%）的魔芋葡甘聚糖（KGM）/羧甲基壳聚糖（CMCS）生物复合膜。为了评估EGCG掺入对KGM/CMCS基质的结构和物理化学性质的影响，系统地评估了所获得的复合成膜溶液（FFS）和膜。傅里叶变换红外光谱（FT-IR）分析结果表明，EGCG与KGM/CMCS复合材料基体之间通过氢键相互作用，这与FFS的流变学结果相一致。扫描电子显微镜（SEM）图像显示，掺入的EGCG（5-15%）在复合材料基质中分散良好，从而改善了最终生物复合材料膜的物理化学性质。EGCG的加入显著提高了膜的抗氧化性和抗菌性（P < 0.05），但降低了膜的透光率和断裂伸长率。此外，适量的EGCG可显著降低膜的透湿性，提高膜的力学性能和热稳定性。而掺入15%表没食子酸没食子酸酯（EGCG）的薄膜的WVP降低至2.65 g mm.m（-2）.day（-1）kPa。(-1)拉伸强度提高了9.16MPa。因此，开发的多功能KGM/CMCS生物复合膜与EGCG共混时，可以有几个潜在的应用作为活性包装材料。
In this study, biocomposite films of konjac glucomannan (KGM)/carboxymethyl chitosan (CMCS) with different epigallocatechin gallate (EGCG) concentrations (0%, 5%, 10%, 15%, and 20%, w/w, based on KGM dry weight) were prepared by the solution casting method. To evaluate the effect of EGCG incorporation on the structural and physicochemical properties of the KGM/CMCS matrix, the obtained composite film-forming solutions (FFS) and films were systematically evaluated. The results from the Fourier transform infrared spectroscopy (FT-IR) analysis showed that EGCG interacted with the KGM/CMCS matrix through hydrogen bonds in the composite matrix, which corroborated with the rheological results of FFS. The scanning electron microscopy (SEM) images revealed that the incorporated EGCG (5-15%) was well-dispersed within the composite matrix, thereby improving the final biocomposite films' physicochemical properties. The addition of EGCG significantly enhanced the antioxidant and antibacterial activities of the films (P < 0.05), while decreased the transmittance and elongation at break. In addition, appropriate content of EGCG remarkably reduced water vapor permeability (WVP) and enhanced mechanical properties and thermal stability of the films. While the WVP of the films incorporated with 15% EGCG reduced to 2.65 g mm.m(-2).day(-1) kPa.(-1), the tensile strength increased by 9.16 MPa. Thus, the developed multifunctional KGM/CMCS biocomposite films when blended with EGCG could have several potential applications as active packaging materials.