质量标准
外观Appearance 白色结晶粉末
溶液澄清度与色泽Clarity: 无色、澄清
红外光谱鉴别Infrared spectrometry 符合
纯度Purity (HPLC) ≥99.0% (面积归一法)
含量Assay (UV ): 99.0% (以干品计)
熔点Melting point 164℃~168℃
比值 (abs. max. 262nm,ε=9,ε=10,000±2%, PH7):
A250/A260 0.70~0.74
A280/A260 0.33~0.43
比旋光度Specific rotation [a]20/D +50 ~ +54 °(C=1, W/V in NaOH)
干燥失重Loss on drying ≤1.0%
灼烧残渣Residue On Ignition ≤0.1%
重金属Heavy Metals(as pb): ≤10ppm