SODIUM ALGINATE OR ALGINIC ACID An anionic polysaccharide distributed widely in the cell walls of brown algae, where it, through binding water, forms a viscous gum. In extracted form it absorbs water quickly; it is capable of absorbing 200-300 times its own weight in water.
Sodium Alginate, alginic acid, Chemistry Experiment: Gel beads and Alginate worms
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"It's used for the production of agar, alginates and carrageenan. Chemicals from brown seaweeds such as alginic acid, mannitol, laminarin, fucoidan and iodine have been extracted successfully on a commercial basis", he said.