Appearance     White crystal or crystalline powder, slightly acidic.    

assay, %               100.21

ammonia salt           ≦0.001

specific rotation     +31.78°

Sulfate %              ≦0.005

Heavy Metal（pb），%    ≦0.0006

arsenic（As），%       ≦0.00002

Loss On Drying，%      ≦0.15

Chloride,              ≦0.0006

Iron(Fe)                ≦0.0002

Residue On Ignition，%  ≦0.03

Transmittance，%       ≧99.6

Other Amino Acids，%    ﹤0.5