纯度Purity                                             99.0~101.0%  
比旋度[a]20/D                                   –68.0° ~ –72.0°(C=2, 5%NaOH)  
干燥失重Loss on drying                    ≤0.5%
炽灼残渣Residue On Ignition          ≤0.1%
重金属Heavy Metals                         ≤0.001%
氨限量(NH3)                                      ≤0.0004%
氯限量Chlorine                                 ≤0.007%
硫限量(S)                                           ≤0.02%  

                                                   超纯级    
外观Appearance                          白色结晶粉末
纯度Purity                                     >99.5% (HPLC)
熔点Melting point                        233°C - 238°C
纯度Purity                                      98.0 - 102.0 % (λ max. 259 nm, pH 7)
(UV)  
                                                            摩尔吸光率molar absorptivity 15400 +/- 2% , 以干基计
干燥失重Loss on drying                   <0.5 % (105°C, 2 小时)
重金属Heavy metals (as Pb)           <10 ppm
硫酸盐灰分Sulfated ash                   <0.1 %
氮Nitrogen (N)                                     25.69 - 26.73 % (以干基计)
透光度Transmittance                      >98 % (c=0.5, H2O, 430 nm) 1 cm cell
吸光率Ratio of Absorbances           0.76 - 0.8 (A250/A260)         0.14 - 0.16 (A280/A260)