Item                 Specifications              Results

Description                          white crystals or               white crystalline powder

crystalline powder

Identification                        meets the requirements                 meets the requirements

Specific rotation                   +14.0°～+15.6°             +14.7°

Loss on drying                     not more than 0.2%                   0.12%

Residue on ignition               not more than 0.1%                   0.09%

Chloride                              not more than 0.05%                 less than 0.05%

Sulfate                                not more than 0.03%                 less than 0.03%

Iron                                    not more than 0.003%                less than 0.003%

Heavy metals                       not more than 0.0015%                     less than 0.0015%

Organic volatile impurities    meet the requirements                 meet the requirements 

Assay                                  98.5%～101.5%                        99.3%

【Conclusion】:This product accords with the standard of USP24