Product: N-Acetyl-L-Cysteine              CAS NO.:(616-91-1)

Lot NO.:070507                          Date: May 21,2007

Item

Specification(AJI92)

Result

Specific rotation[a]D20

+21.3 to +27.0°

+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

Not more than 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?

106 to 110?