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 ): 98.0%~102.0% (以干品计)
熔点Melting point 182℃~190℃
比值 (abs. max. 267nm,ε=9,780±2%, PH7):
A250/A260 0.6~0.68
A280/A260 0.67~0.75
比旋光度Specific rotation [a]20/D -18.4 ~ -18.2 °(C=2, W/V in 0.2N NaOH)
干燥失重Loss on drying ≤0.5%
灼烧残渣Residue On Ignition ≤0.3%
重金属Heavy Metals(as pb): ≤10ppm