Chondroitin sulfate (CS) is a glycosaminoglycan covalently bonded to protein to form proteoglycans. CS is widely distributed in the extracellular matrix and cell surface of animal tissues. The sugar chain consists of alternating glucuronic acid and n-acetylgalactosamine (n-acetylgalactosamine) disaccharide units connected to the serine residue of the core protein by a sugar-like link region. At present, the main sources of CS extraction are shark, cow, pig and chicken cartilage.

Chondroitin sulfate (CS) is a class of glycosaminoglycans covalently attached to proteins to form proteoglycans. Chondroitin sulfate is widely distributed in the extracellular matrix and cell surface of animal tissues. The sugar chain consists of the aggregation of alternating glucuronic acids and n-acetylgalactosamine, which is linked to the serine residue of the core protein through a sugar-like link region.

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Chondroitin Sulfate Salium is the sodium salt of the sulfated linear glycosaminoglycan obtained from bovine,porcine,or avian cartilages of healthy and domestic animals used for food by humans.Chondroitin Sulfate Sodium consists mostly of the sodium salt of the sulfate ester of N-acetylchondrosamine(2-acetamido-2-deoxy-β-D-galactopyranose)and D-glucuronic acid copolymer.These hexoses are alternately linked β-1,4 and β-1,3 in the polymer.The prevalent glycosaminoglycans are designated chondroitin sulfate sodium A,containing N-acetylchondrosamine-4-O-sulfate,and chondroitin sulfate sodium C,containing N-acetylchondrosamine-6-O-sulfate.It contains not less than90.0 percent and not more than 105.0 percent of total glycosaminoglycans as chondroitin sulfate sodium,calculated on the dried basis.