响应面法优化胡麻可溶性膳食纤维-壳聚糖复合膜的机械性能

Optimization of Mechanical Properties of Flaxseed Soluble Dietary Fiber-Chitosan Composite Films by Response Surface Methodology

摘要:

胡麻可溶性膳食纤维（Flaxseed Soluble Dietary Fiber, fSDF）是胡麻加工副产物——胡麻粕中的重要组成成分之间，胡麻可溶性膳食纤维具有一定的成膜性，但是单一组分膜的机械性能较差。基于此，采用响应面法优化胡麻可溶性膳食纤维-壳聚糖复合膜的制备工艺，以提升复合膜的机械性能。以fSDF浓度、甘油浓度、冰乙酸浓度、壳聚糖浓度作为变量，进行单因素实验，并以fSDF浓度、甘油浓度、壳聚糖浓度作为响应面实验设计的三个因素，以拉伸强度和断裂伸长率作为衡量指标进行实验。结果表明胡麻可溶性膳食纤维-壳聚糖复合膜的最佳制备工艺为壳聚糖质量浓度为20.7 g/L、SDF质量浓度为7.8 g/L、甘油质量浓度为7.4 g/L、冰乙酸质量浓度为12 g/L，最佳制备工艺条件下得到的复合膜拉伸强度为26.14 MPa、断裂伸长率为210.89%。综上所述，与单一膜相比，复合膜的机械性能得到了显著改善。

Abstract:

Flaxseed soluble dietary fiber (fSDF), one of the main components of flaxseed meal, a by-product of flaxseed, exhibits film-forming ability. However, single-component fSDF film has poor mechanical properties. Based on this, the preparation parameters of fSDF-chitosan composite films were optimized using the response surface method to improve mechanical properties of the films. The fSDF, glycerol, acetic acid, and chitosan concentrations were used as variables in single-factor experiments. Except for the acetic acid concentration, the other three factors were adopted as variables in the response surface experiments. The tensile strength and elongation at break of the films were used as the response values. The results showed that the optimal parameters were 20.7 g/L of chitosan, 7.8 g/L of fSDF, 7.4 g/L of glycerol, and 12 g/L of acetic acid. The tensile strength and elongation at break of the composite film prepared with the optimal parameters were 26.14 MPa and 210.89% respectively. These results indicate conclusively that the composite film has markedly improved mechanical properties compared to the single-component film.