浓缩乳清蛋白/魔芋葡甘聚糖复配蜂蜡膜

Beeswax Film by Compounding Whey Protein Concentrate/Konjac Glucomannan

为了对魔芋葡甘聚糖(KGM)薄膜进行优化,在魔芋葡甘聚糖溶胶中加入浓缩乳清蛋白(WPC)和蜂蜡(BW)制备KGM复合薄膜。分析了KGM-WPC和BW不同比例复合薄膜的力学性能、含水量、溶胀性、可溶性物质含量、水蒸气透过率、气体透过率以及红外光谱的变化。结果表明,浓缩乳清蛋白和蜂蜡的加入,魔芋葡甘聚糖薄膜的力学性能和疏水性能得到显著改善。随着蜂蜡的增加,薄膜的厚度增加,在不同比例的KGM–WPC/BW中,KWB20(m(KGM-WPC)∶m(BW)=8∶2)的断裂伸长率最大,但阻水性能不好;KWB60(m(KGM-WPC)∶m(BW)=4∶6)的溶胀性较小,可溶性物质较少,但拉伸强度和断裂伸长率较小;KWB80(m(KGM-WPC)∶m(BW)=2∶8)的溶胀性能最小可溶性物质最少,但气体透过率太高,拉伸强度和断裂伸长率过小,不利于成膜;加入蜂蜡的红外光谱有所变化。总的来说,KWB40(m(KGM-WPC)∶m(BW)=6∶4)的组合是能够获得KGM–WPC/BW复合薄膜最佳性能的组合。

In order to optimize konjac glucomannan （KGM） film, whey protein concentrate （WPC） and beeswax （BW） were added in konjac glucomannan collosol to prepare KGM composite films. The mechanical properties, water content, swelling property, soluble matter content, water vapor permeability, gas permeability and infrared spectrum of different proportion composite films of KGM-WPC and BW were analyzed. The results show that mechanical properties and hydrophobic properties of konjac glucomannan film are significantly improved by adding whey protein concentrate and beeswax. The film thickness increases with increase of the beeswax. In different proportion of KGM-WPC/BW, KWB20 （mass ratio of KGM-WPC ： BW is 8 ： 2） has the maximum strength and elongation tensile, but water resistance is not gcxxt; the swelling of the KWB60 （mass ratio of KGM-WPC：BW is 4 ： 6） and soluble substances are less, but the tensile strength and elongation are smaller; KWB80 （mass ratio of KGM- WPC：BW is 2：8） has the minimum soluble substances, but the gas transmission rate is too high, the strength and elongation are the minimum which are not conducive to form film; IR of film changes. Overall, the combination of KWtN0 （mass ratio of KGM-WPC： BW is 6：4）is one of KGM-WPC/BW composite films with the best performance.