occurs both in the free state and in the calcium salt in the larger brown algae. The sodium salt gives a very viscous soltion in water even at a concentration of only 2%, and is used in the dyeing, textile, plastics and explosives industries, in making waterproofing and insulating materials, foodstuffs, adhesives, cosmetics, and in medicine, for its sodium absorption ability by a cation exchange reaction., mannuroon- ja guluroonhappejääkidest koosnev polüsahhariid, lahustub kuumas vees, moodustab sooli ja estreid - alginaate. Algiinhapet sisaldavad pruunvetikate rakuseinad, teda saadakse vetikaid leelistega ekstraheerides. Algiinhapet ja alginaate kasut. toiduaine- ja kergetööstuses, kosmeetikas ning meditsiinis.