Sporophyl polysaccharides of undaria pinnatifida and preparation method for sporophyl polysaccharides

The invention relates to sporophyl polysaccharides of undaria pinnatifida and a preparation method for the sporophyl polysaccharides. The sporophyl polysaccharides of the undaria pinnatifida are prepared by performing electrodialysis on a solution containing the polysaccharides for 30 to 90min for desalination under a voltage condition of 10 to 20V, and the salt content of the polysaccharides is 2 to 6 percent. According to the preparation method for the sporophyl polysaccharides of the undaria pinnatifida, the problem of high salt content of conventional preparation of the sporophyl polysaccharides of the undaria pinnatifida is solved, the obtained sporophyl polysaccharides of the undaria pinnatifida are higher in purity and bioactivity, and the quality of the sporophyl polysaccharides of the undaria pinnatifida is improved. 本发明涉及种裙带菜孢子叶多糖及其制备方法，该裙带菜孢子叶多糖是经10-20V电压条件下、将含有所述多糖的溶液电渗析30-90min脱盐制得，所述多糖的含盐率为2-6％。通过本发明的技术方案提供的裙带菜孢子叶多糖的制备方法，在解决传统制备裙带菜孢子叶多糖含盐分高的问题的同时，能得到纯度较高、生物活性较好且提取率也较高的裙带菜孢子叶多糖，提高了裙带菜孢子叶多糖的质量。