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 -3.0~-4.0°(C = 2,CH3COOH) -3.7° 含量Assay min 99.0% 99.3% 熔点Melting point 48~52℃ 48~51℃ 水份Water 7.0% ~9.0% 8.2% 灼烧残渣Residue on ignition max 0.4% 0.08%