[0015] In the present invention, alginate (alginic acid) is defined as an anionic polysaccharide distributed widely in the cell walls of brown algae. Alginate is a linear copolymer with homopolymeric blocks of (1 -4)-linked β-D-mannuronate (M) and its C-5 epimer oL-glucuronate (G) residues, respectively, covalently linked together in different sequences or blocks. The chemical compound sodium alginate is the sodium salt of alginate. Its empirical formula is NaC6H7C>6. Sodium alginate is a gum, extracted from the cell walls of brown algae.