L-Cysteine

Chemical Name：

L(-)-3,3'-Dithiobis(2-aminopropanoic acid)

Structure Formula：

Molecular Formula：

C₆H₁₂N₂O₄S₂

Molecular Weight：

240.29

Cas No：

[56-89-3]

Characteristics：

a colorless or white crystalline substance of hexagon, or crystalline powder, easily soluble in acid and alkali, insoluble in water and organic solvents such as alcohol, ethyl ether

Quality Standards：

AJI97

Item

Specifications (AJI97 )

Appearance

White crystal or crystalline powder; tasteless

Assay, %

98.5~101.0

Specific rotation

-218°~ -224°

Loss on drying, %

≤0.2

Transmittance, %

≥98.0

Chloride (as Cl), %

≤0.02

Sulfate (as SO₄), %

≤0.02

Ammonium as (as NH₄), %

≤0.02

Iron (as Fe), %

 ≤0.001

Heavy Metals (as Pb), %

 ≤0.001

Arsenic (as As), %

 ≤0.0001

pH Value

  5.0~6.5

Residue on ignition, %

≤0.1

Other amino acid

Conforms

The Characteristics and Uses：

 L-Cystine is one of the important products the amino acid series. It is widely used in medical, chemical and food industries.

Cystine promotes oxide and reductive ability of human cell, increases white blood cell, cures the infections diseases such as asthma, never ache, eczema. It is a good drug for prevention of skin old and feeble, cirrhosis and other liver diseases.

Package and Transport：

   This product is contained in a double-layer package, the inner layer being a sealed nonpoisonous polyethylene bag or alumin, and the outer layer being a paper board barrel. Each barrel contains a net weight of 25kg. Packages may be arranged in accordance with customer’s requirements.      

      Handle with care. Protect the product from sunshine or rain. Do not transport them together with poisonous or harmful goods. This product belongs to the non-dangerous category and can be transported as a general chemical product.

Storage：

   Stored in dry, clean and ventilated places. In order to avoid pollution, it is prohibited to place this product together with poisonous or harmful substances. The expiry date is for two years.