中国药典2010版Test Items项目Specification质量指标Assay 含量≥98.5%PH酸度5.4~6.0Transmittance溶液透光率≥98.0%Chloride氯化物≤0.02%Sulfate硫酸盐≤0.02%Ammonium铵盐≤0.02%Other amino acids其他氨基酸≤0.5%Loss on drying干燥失重≤0.2%Residue on ignition炽灼残渣≤0.1%Iron铁盐≤0.001%Storage:Preserve in well-closed containers密封保存