Items

Specification (EP4)

Specification (AJI92)

Specification (BP98)

Description

White crystals or crystalline powder

Identification

Infrared absorption spectrum

A; B; C;

Specific rotation
[a]_D^{20 °}

-3 2 .5 ° - -35.5 °

-33.5 ° - -36.5 °

-3 2 .5 ° - 35.5

State of solution (Transmittance)

Clear and colorless

≥ 98.0%

Clear and colorless

Chloride(Cl)

≤ 0. 15

≤ 0.04%

≤ 0. 15

Ammonium(NH₄)

- - - -

≤ 0.02%

- - - -

Sulfate(SO₄)

≤ 0. 03

≤ 0.0 2 %

≤ 0. 03

Iron(Fe)

- - - -

≤ 30PPm

- - - -

Heavy metals(Pb)

0.001%

≤ 10PPm

0.001%

Arsenic(As₂O₃)

- - - -

≤ 1PPm

- - - -

Other amino acids

- - - -

Conforms

- - - -

Loss on drying

≤ 0.5 %

≤ 0. 30 %

≤ 0.5 %

Residue on ignition (Sulfated)

≤ 0. 3 %

≤ 0. 1 %

≤ 0. 3 %

PH

2.0-3.0

2.0-3.5

2. 8-3.0

Assay

98. 5-10 1 .0%

98.5-101.0%

98.5-101.0%

L-cystine L-Cysteine

≤ 0.5 %
≤ 0.5 %

- - - -

Ninhydrin-positive substances: ≤ 0.5 %