几种天然多糖的吸湿和保湿性能的初步研究

Preliminary Study on the Properties of Moisture Absorption and Moisture Retention of Several Natural Polysaccharides

通过干燥器控制湿度的方法对魔芋葡甘聚糖、羧甲基纤维素钠、壳聚糖、海藻酸钠等多糖与常用保湿剂甘油进行了吸湿和保湿性能测试。结果表明,在高相对湿度条件下,各试样的吸湿能力依次为:羧甲基纤维素钠>甘油>海藻酸钠>魔芋葡甘聚糖>壳聚糖;在低相对湿度条件下,各试样的吸湿能力依次为:甘油>羧甲基纤维素钠>海藻酸钠>魔芋葡甘聚糖>壳聚糖。各试样的保湿能力依次为:壳聚糖>魔芋葡甘聚糖>海藻酸钠>甘油>羧甲基纤维素钠。此外,采用热重分析法(TGA)对各试样的失重率进行了测试,其失重曲线与保湿曲线趋势一致。

The properties of moisture absorption and moisture retention of several natural polysaccharides such as konjac glucomannan（KGM）, sodium cellulose glycolate（CMC-Na）, chitosan （CS）, sodium alginate（SA） were studied by controlling the relative humidity of desiccators and compared with glycerol, a commonly used humectant. The results showed that,the moisture absorption rate had the following tendency.CMC-Na）glycerol）SA）KGM）CS under the higher relative humidity, while glycerol ） CMC-Na ）SA）KGM）CS under the lower relative humidity. The moisture retention rate showed the following tendency： CS）KGM）SA） glycerol）CMC-Na. The weight loss rates of samples were also determined by thermal gravimetric analysis （TGA） ,which changed in accordance with moisture retention.