白色菱形结晶 (从水中析出，含2分子结晶水)或单斜片状结晶(无结晶水)，无臭，味苦；易溶于水(0℃水中溶解度为83g/L，50℃水中溶解度为 400g/L)，极微溶于乙醇，不溶于乙醚；pI6.0；加热至105℃时失去两分子结晶水，230℃时颜色变深，分解点为244℃；比旋光度[α]20D+12.5°(0.5-2.0mg/ml，H2O)，[α]20D+27.3°(0.5-2.0mg/ml，6mol/L HCl)；水溶液在205nm处有最大吸收(1gε3.28)。

98%：

外观Appearance                                               白色结晶或结晶粉末
红外光谱鉴别Infrared spectrometry               和对照品匹配 
纯度Purity                                                         >98.0 % （以干基计）
干燥损失Loss on drying                                 <0.5 % (1 g, 105°C) 
重金属Heavy metals (as Pb)                        <10 ppm 
硫酸盐灰分Sulfated ash                                <0.1 % 
比旋度Specific rotation [a]20/D                    +25.8° - +28.5°(c=8, 6 N HCl) 以干基计
痕量分析Trace analysis Type: 
  SO4                                            < 200 ppm 
  Fe                                                < 10 ppm 
  NH4                                            < 100 ppm 
  Cl                                                < 200 ppm 
溶解性Appearance of solution (10% in water)      无色透明



品级Grade             非动物源，EP, JP, USP ；用于细胞培养，98.5 to 101.0%  
        (from non-animal source, EP, JP, USP, for cell culture, 98.5 to 101.0%)
来源origin                                            non-animal source 
外观appearance                                 white crystalline powder 
红外鉴别试验identification by ir      compares to reference standard 
水溶性solubility                                  clear colorless solution at 1.0g to 10ml of water
比旋光度specific rotation                 +26.9 to +27.9 °(20°C/EP)   +26.3 to +27.7 ° (25°C/USP) 
* c = 8 in 6M hydrochloric acid 
氯chloride                                         ≤ 0.020% 
铵ammonium                                   ≤ 0.02% 
硫酸盐sulfate                                   ≤ 0.020% 
铁iron                                                 ≤ 10 ppm 
重金属heavy metals                        ≤ 10 ppm 
干燥失重loss on drying                  ≤ 0.50% 
灼烧残渣residue on ignition          ≤ 0.10% 
残留溶剂residual solvents              meets the requirements 
茚三酮阳性物质ninhydrin-positive substances (other amino acids) 
                                       conforms 
ph test                                              10.5 to 12.0 (5% in water) 
含量assay (dry basis)                  98.5 to 101.0% 
内毒素endotoxin assay                  ≤ 1 eu/mg 
细胞培养测试cell culture test          pass

用途  用于生化研究，各类肝昏迷及病毒性肝类谷丙转氨酶异常者。 
用途  营养增补剂；调味剂。途  用作医药原料及食品添加剂
密封干燥避光保存。