韩国三级电影播放_成年黄色电影_美国做爰xxxⅹ性视频_日本一区二区在线_bbbbbbbbb免费毛片视频_91欧美_91成人app_国产91免费视频_国产精品成人免费视频_欧美一级二级三级_亚洲制服丝袜在线播放_日本韩国欧美一区_非洲一级片_亚洲国产精品久久久久_日本va欧美va国产激情

Polysaccharide, as a large class of natural products, has the functions of antiviral, anti-tumor, immune regulation and interferon stimulation. It has been widely used in the treatment of gastric cancer, lung cancer, breast cancer and other drugs. It has also become a hot research topic in recent years. Polysaccharide is a kind of high molecular carbohydrate composed of at least 10 monosaccharides and linked by glycoside bond. One of the remarkable characteristics of this kind of substance is that it has almost no ultraviolet absorption, or it is very weak. It has its unique method in detection means.