七星剑花茎多糖的提取工艺研究及保湿性能测试
Study on the Extraction Technology and Moisturizing Performance of Polysaccharide from the Stem of Hylocereus undatu

本文在超声波辅助下，利用热水浸提法七星剑花茎多糖，以苯酚–硫酸法测量多糖的含量，探讨了料液比、浸提时间和浸提温度等因素对多糖的率的影响，并运用体外法探讨了七星剑花茎多糖的保湿性能，研究结果表明最佳提取工艺条件为：料液比为1:5、浸提时间为25 min、浸提温度为80℃，七星剑花茎多糖得率为1.724%；在低湿度环境下，1%多糖溶液的保湿率高于10%甘油溶液和1 g/L甘油溶液的保湿率，而在高湿度环境下，1%多糖溶液的保湿率介于后两者之间；含茎多糖雪花膏的保湿率介于含甘油雪花膏的保湿率和含茎多糖与甘油混合物雪花膏的保湿率，表明多糖与甘油在保湿性能方面有协同作用。
Polysaccharide was extracted from the stem of Hylocereus undatu by hot water extraction with ultrasound-assisted, using phenol-sulfuric acid method to measure the content of polysaccharide. The effects of the ratio of solid to liquid, extraction time and extraction temperature on the yield of polysaccharide were studied, and the moisturizing performance of polysaccharide was test by vitro methods. The experimental results of the extracting technology condition showed that the yield of polysaccharide from the stem of Hylocereus undatu was up to 1.724% with the ratio of solid to liquid is 1:5, extraction time is 25 minutes and extraction temperature is 80？C. The study on the moisturizing performance of polysaccharide indicated that, the moisture retention rate of 1% polysaccharide solution was higher than that of 10% glycerol solution and 1 g/L glycerol solution under low humidity, while the moisture retention rate of 1% polysaccharide solution was between the latter two under high humidity. The moisturizing efficiency of snow cream with polysaccharide was between that of snow cream with glycerin and that of snow cream with the mixture of stem polysaccharide and glycerin, indicating that polysaccharide and glycerin had synergistic effect on the moisturizing performance.