ITEMS

SPECIFICATION

RESULTS

Appearance

   white or off-white crystalline powder

Pass

Specific rotation [a]D20°

 +21.3°~+27.0°

 +22.0°

 State  of  solution

clear  and  colorless

Pass

Transmittance

not  less  than  98.0%

98.5%  

Chloride(cl)

not  more  than  0.04%

0.032%

Ammonium(NH₄)

not  more  than  0.02%

0.010%

Sulfate(SO₄)

not  more  than  0.030%

 0.020%

Iron(Fe)

not  more  than  20ppm

 6ppm

Heavy  metals(Pb)

not  more  than  10ppm

6ppm

Arsenic(AS₂ O₃)

not  more  than  1ppm

0.5ppm

Other  amino  acids

Chromatographically  not  detectable

Qualified

Loss  on  drying

not  more  than  0.5%

0.358%

Residue  on  ignition (sulfated)

not  more  than  0.2%

0.15%

Assay

98.5%~101.0%  

99.92%

PH

2.0  to  2.8

  2.5  

Melting point  

106°to 110°  

 pass

Conclusion: The product complies with AJI92 standard