项目Item 检测标准Test Criterion 结果Result 外观Appearance 白色结晶粉末 white crystalline powder 符合Conforms 比旋度Specific rotation +13±1°(C = 1 in MeOH) +13.2° 含量Assay min 99.0% 99.65% 熔点Melting point 72 ℃ to 75℃ 73.5℃ to 74.5℃ 干燥失重Loss on drying max 0.5% 0.2% 灼烧残渣Residue on Ignition max 0.4% 0.1%