Potassium alginate (Potassium alginate, potassium alginic acid, E402) is the potassium salt of alginic acid.
It is easily soluble in water and thus a high-viscosity solution is obtained. The chemical formula is [C12H14O12K2]n.
It is used as a thickener and stabilizer in the production of ice cream and dairy products, jelly, cosmetics, pharmacy, etc.