脂质-CMC可食性复合膜阻湿性能的影响因素研究

Study on Moisture Barrier Performance of Lipid-CMC Edible Film

利用羧甲基纤维素(CMC)为主要成膜材料,添加脂类物质及增塑剂,研究了脂质-CMC可食性复合膜阻湿性能的影响因素。影响膜的阻湿性能的因素依次为:蜂蜡>CMC>硬脂酸>PEG400>水/乙醇体积比。随着蜂蜡、硬脂酸含量的增加,可食性膜的水蒸气透过率下降,且2种添加剂均会降低膜的机械性能和阻油性,提高其阻氧性;随着CMC、乙醇、PEG400的含量的增加,膜的水蒸气透过率先下降后上升。结果表明具有较好阻湿性能包装膜的最佳配比为:水/乙醇体积比为95∶5,硬脂酸质量浓度为0.02g/mL,PEG400质量分数为1.5%,蜂蜡质量浓度为0.004g/mL,CMC质量质量浓度为0.03g/mL。

Influencing factors on moisture barrier performance of lipids-CMC edible film were studied, which contained carboxymethyl cellulose as the main film material, and lipids and plasticizers as additives. The sequence of factors on water vapor transmission rate is beeswax〉 CMC content〉 stearic acid〉 PEG400〉 water/ethanol. The result indicated that with the increase in stearic acid and beeswax content, the film＇s water vapor transmission rate, mechanical properties, and oil resistance decreases, but its oxygen barrier increases; with the increment of CMC, ethanol and PEG400 content, film＇s water vapor transmission rate first decreased and then increased. The optimum composition ratio for water vapor barrier performance is water/ethanol （95/ 5）, stearic acid （0.02 g/mL）, PEG400 （1.5%）, the wax （0. 004 g/mL） and CMC （0.03 g/mL）.