Arthritis has become the leading cause of disability worldwide. As arthritis pain intensifies and mobility is restricted, it can lead to temporary or permanent loss of working ability, causing significant social and economic losses. D-glucosamine sulfate, due to its high activity and easy absorption, is a major matrix of articular cartilage and synovial fluid, and is increasingly widely used in the treatment of arthritis.

Detection Methods

(1) Dissolution: Dissolve D-glucosamine sulfate in a solvent at 0°C; the solvent is a saturated ammonium sulfate solution or dimethyl sulfoxide; the weight-to-volume ratio of D-glucosamine sulfate to the solvent is 100 mg: 1 ml; filter the solution to obtain a solid;

(2) Detection: Detect the obtained solid with chloride and sulfate ions according to the detection methods for potassium chloride (or sodium chloride) and potassium sulfate (or sodium sulfate); the detection methods for chloride and sulfate ions are based on Appendix VIII A (Chloride Test) and Appendix VIII B (Sulfate Test) of the 2010 edition of the Chinese Pharmacopoeia, Part II;

(3) Judgment: Based on the results of the above detection of chloride and sulfate ions, determine the D-glucosamine sulfate prepared by different methods. The salts are distinguished as follows: In a saturated ammonium sulfate solution, the completely soluble form is either D-glucosamine sulfate (potassium chloride) or D-glucosamine sulfate (sodium chloride). If there is an insoluble residue of potassium sulfate, the original product is a mixture of D-glucosamine hydrochloride and potassium sulfate; if there is an insoluble residue of sodium sulfate, the original product is a mixture of D-glucosamine hydrochloride and sodium sulfate. In dimethyl sulfoxide (DMSO), if the insoluble residue is potassium chloride, the original product is D-glucosamine sulfate (potassium chloride); if the insoluble residue is sodium chloride, the original product is D-glucosamine sulfate (sodium chloride). In dimethyl sulfoxide (DMSO), if the insoluble residue is potassium sulfate, the original product is a mixture of D-glucosamine hydrochloride and potassium sulfate; if the insoluble residue is sodium sulfate, the original product is a mixture of D-glucosamine hydrochloride and sodium sulfate.