Product name: L-Cystine

Synonyms: L(-)-3,3'-Dithiobis(2-aminopropanoic acid); 2-Amino-3-[(2-amino-2-carboxyethyl)dithio]propanoic acid

Formula: C6H12N2O4S2

Molecular: 240.29

CAS number: 56-89-3

Description: Fine white crystalline powder

Specific rotation: -215° ~ -225°

Chloride(Cl): NMT 0.05%

Ammonium(NH4): NMT 0.02%

Sulfate(SO4): NMT 0.02%

Iron(Fe): NMT 10 ppm

Heavy metals: NMT 20 ppm

Lead: NMT 5 ppm

Arsenic: NMT 1 ppm

Other amino acids: Chromatographically not detectable

Loss on drying: NMT 0.20%

Residual solvents: NMT 0.10%

Assay: 98.5% ~ 101.5%

<p>Welcome to Zhongbei Northland Bio-Chem Industry Co., Ltd a global chemical providers since 2002. We are specialized in developing, manufacturing and marketing active ingredients with high bio-activity and safety, serving the nutritional supplements and functional food ,cosmetic and pharmaceutical industries.  Characteristics: Honored with the title of No. 1 Strong Foreign Trade Enterprises by Heilongjiang Provencial Government. Warehouses located in the US; Strong sourcing capability of working with over 100 manufacturers in China; GMP standard workshops for natural pigment, traditional drug extracts, chemical-synthetic , Auxiliary workshops under 13000 square metres Quality assurance system; In-house and third party laboratories; R & D laboratory with 27 technical persons.Production with 164 workers Passed through ISO9001 All the products we produce and sell are of good quality and new technology.We shall bring into full play our advantages to provide excellent and all-round service for our customers by right of our integrated service capability, abiding by the principle of pursuing  Sincerity, Credit, Safety and Nicety.</p>