凝集素或译选择素来源于拉丁文“legere”,多数是含糖蛋白质,能与细胞膜表面枝状糖成分非共价结合,其结合又可被特异糖所抑制,故成为研究细胞膜蛋白,糖脂成分的探针。它广泛存在于植物、低等动物、微生物中。已证实自然界中有一千多种植物含有各种选择素。经纯化并鉴定性质的已有60～70种。中药泽泻是一种利尿药,有防老、降血脂、 Lectins or translation selectins originate from the Latin word “legere”, most of which are glycoproteins. They bind non-covalently to the dendritic sugars on the surface of cell membranes, and their binding can be inhibited by specific sugars. Therefore, they have become cell membrane proteins and sugars. Lipid probes. It is widely found in plants, lower animals, and microorganisms. It has been confirmed that more than one thousand plants in nature contain various kinds of selectins. 60 to 70 species have been purified and identified. Alisma orientalis is a diuretic, anti-aging, hypolipidemic,