Alginate is a kind of natural polysaccharide consisted in brown seaweed,as a natural product generated from alginic acid indwell in seaweed and minerals indwell in sea.Alginic acid is a mix-polysaccharide composed of D-mannuronic adid(M) L-guluronic acid(G).The main alginate series include sodium alginate,potassium alginate,calcium alginate,ammoinum alginate etc.