脱乙酰改性对魔芋葡甘聚糖/黑米膳食纤维复合膜特性的影响

Effect of deacetyl modification on the characteristics of konjac glucomannan/black rice dietary fiber composite films

中文关键词:  魔芋葡甘聚糖  黑米膳食纤维  脱乙酰改性

英文关键词:konjac glucomannan  black rice dietary fiber  deacetylated modification

中文摘要:

      目的 探究脱乙酰对魔芋葡甘聚糖(konjac glucomannan, KGM)/黑米膳食纤维复合膜特性的影响。方法 对KGM进行脱乙酰改性, 将脱乙酰前后的KGM与黑米膳食纤维、甘油、蛭石共混, 采用流延法制备两种复合膜, 以复合膜拉伸强度、断裂伸长率、水蒸气透过率、溶水率为考察因素, 确定最优配方, 并通过傅里叶变换红外光谱和扫描电镜进行表征。结果 魔芋葡甘聚糖/黑米膳食纤维复合膜制备最佳配方为每100 mL蒸馏水中添加魔芋葡甘聚糖0.37 g、黑米膳食纤维0.074 g、甘油0.60 g、蛭石0.074 g, 复合膜的拉伸强度可达11.20 MPa。脱乙酰魔芋葡甘聚糖/黑米膳食纤维复合膜最佳配方为每100 mL蒸馏水中添加脱乙酰度0.2%魔芋葡甘聚糖0.37 g、黑米膳食纤维0.074 g、甘油0.50 g、蛭石0.074 g, 在此条件下, 拉伸强度为12.67 MPa。脱乙酰改性使复合膜抗拉强度提高13%、断裂伸长率降低17%、溶水率降低12%、水蒸气透过系数降低41%, 红外光谱与扫描电镜结果表明脱乙酰魔芋葡甘聚糖黑米膳食纤维复合膜具有更高的稳定性。结论 脱乙酰改性处理改善了复合膜微观结构, 提高了复合膜的物理性能。本研究为新型复合膜的开发提供理论参考, 并为魔芋葡甘聚糖与黑米膳食纤维的开发利用提供参考。

英文摘要:

      Objective To explore the effects of deacetylation on the characteristics of konjac glucomannan (KGM)/black rice dietary fiber composite films. Methods KGM was modified by deacetylation, KGM before and after deacetylation was mixed with black rice dietary fiber, glycerin and vermiculite. Two kinds of composite films were prepared by the spreading method. The tensile strength, elongation at break, water vapor transmittance and water solubility of composite films were taken as indexes to determine the optimal formula, and characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Results The optimum preparation formula of konjac glucomannan/black rice dietary fiber composite film was 0.37 g konjac glucomannan, 0.074 g black rice dietary fiber, 0.60 g glycerol and 0.074 g vermiculite were added to 100 mL distilled water. The tensile strength of the composite film was 11.20 MPa. The optimal formulation of the composite membrane for deacetylated konjac glucomannan/black rice dietary fiber was deacetylation 0.2%, konjac glucomannan 0.37 g, 0.074 g black rice dietary fiber, 0.60 g glycerol and 0.074 g vermiculite were added to 100 mL distilled water. Under these conditions, the tensile strength was 12.67 MPa. Deacetylation could increase the tensile strength of composite films increased by 12%, the elongation at break decreased by 17%, the water solubility decreased by 12%, and the water vapor transmission coefficient decreased by 41%. The results of infrared spectroscopy and scanning electron microscopy showed that the konjac glucomannan/black rice dietary fiber composite films were more stable. Conclusion The deacetylated treatment have improved the physical properties and microstructure of the composite films, which can provide a theoretical reference for the new composite films, and provide a reference for the development and utilization of konjac glucomannan and black rice dietary fiber.