The main component of sodium alginate is sodium alginate, which is a mixture of polyuronic acid. Sodium alginate is widely used in pharmaceutical preparations, food and cosmetics, which is almost non-toxic and non-irritating. The gel formed by sodium alginate and calcium ion has the characteristics of freezing resistance and swelling recovery after drying. The viscosity of sodium alginate affects the brittleness of the gel. The higher the viscosity, the more brittle the gel is..