Product:  L- Cysteine                    CAS NO.:56-89-3

Lot NO.: 100305                       Date:  March 10, 2010

Item

Specification(AJI92)

Result

Specific rotation[a]D20

-21.3 to -225°

+23°

State of solution

 ( Transmittance)

Clear and colorless

Not less than 98.0%

99.0%

Chloride(Cl)

≤  0.04%

≤  0.04%

Ammonium(NH4)

≤  0.02%

≤  0.02%

Sulfate (SO4)

≤  0.030%

≤  0.020%

Iron(Fe)

≤  20ppm

≤  5ppm

Heavy metals(Pb)

≤  10ppm

≤  5ppm

Arsenic(as As2o3)

≤  1ppm

≤  1ppm

other amino acids

Chromatographically

Not detectable

Conforms

Loss on drying

≤  0.5%

0.2%

Residue on ignition(sulfated)

≤  0.50%

0.04%

Assay

98.5% to 101.0%

99.9%

PH

2.0 to 2.8

2.3

Melting point

106 to 110°C

106 to 110°C