Alginic acid is a polysaccharide distributed widely in the cell walls of brown algae that is hydrophilic .It is Mixed polymer of mannuronic acid and
guluronic acid.
Alginic acid is a high molecular weight linear polymer isolated from seaweed. It is a linear β-1→4-linked polymer of n-mannuronic and L-guluronic acid. It is an acid polysaccharide present in the extracellular matrix of brown algae.