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L-cystine or Cystine or L-Dicysteine
CAS Number: 56-89-3
Molecular Formula: C6H12N2O4S2
Molecular Weight: 240.30
L-cystine or Cystine or L-Dicysteine
Cystine is the oxidized derivative of the amino acid cysteine. Cysteine is used in various nutritional products, acne treatments, and in creams to treat cervical injury or inflammation.
General Properties and Specifications of L-cystine or Cystine or L-Dicysteine:
Appearance: White to off-white crystalline powder.
Assay: 98.5% minimum.
Melting Point: 260.5C.
Relative Density: about 1.66
Solubility: Slightly soluble in water.
Storage: Room temperature. Protected from light.
Cystine USP Grade Dietary Supplement Specifications:
C6H12N2O4S2 -- 240.30
l-Cystine;3,3′-Disulfanediylbis [(2R)-2-aminopropanoic acid CAS 56-89-3
UNII: 48TCX9A1VT
DEFINITION
Cystine contains NLT 98.5% and NMT 101.5% of cystine (C6H12N2O4S2), as l-Cystine, calculated on the dried basis.
IDENTIFICATION
A. Infrared Absorption
B. Optical Rotation, Specific Rotation
Sample solution: 20 mg/mL, in 1 N hydrochloric acid. Perform the measurements immediately after preparation.
Acceptance criteria: −215 to −225, determined at 20°
C. The RF value of the principal spot of the Sample solution in the test for Organic Impurities corresponds to that of the Standard solution.
Residue on Ignition: NMT 0.1%
Chloride and Sulfate, Chloride: NMT 200 ppm. A 0.7-g portion shows no more chloride than corresponds to 0.40 mL of 0.01 N hydrochloric acid.
Chloride and Sulfate, Sulfate: NMT 200 ppm. A 1.2-g portion shows no more sulfate than corresponds to 0.25 mL of 0.020 N sulfuric acid.
Iron: NMT 10 ppm
Organic Impurities:
(A) Individual impurities: 0.2%
(B) Total impurities: 2% maximum.
Loss on Drying: Dry a sample at 105C for 3 h. Acceptance criteria: NMT 0.2%
L-Cystine FCC Food Grade Specifications:
3,3’-Dithiobis(2-aminopropanoic acid)
C6H12N2O4S2 Formula weight 240.30
INS: 921 CAS 56-89-3
DESCRIPTION
L-Cystine occurs as colorless to white crystals. It is soluble in diluted mineral acids and in alkaline solutions. It is very slightly soluble in ater and in alcohol.
Function: Nutrient.
REQUIREMENTS
Identification: The infrared absorption spectrum of the sample exhibits relative maxima at the same wavelengths as those of a typical spectrum as shown in the section on Infrared Spectra, using the same test conditions as specified therein.
Assay: Not less than 98.5% and not more than 101.5% of C6H12N2O4S2, calculated on the dried basis.
Lead: Not more than 5 mg/kg.
Loss on Drying: Not more than 0.2%.
Optical (Specific) Rotation [α]D20°: Between −215° and −225°, calculated on the dried basis.
Residue on Ignition: Not more than 0.1%.
We also supply Cystine BP Ph Eur EP Grade.
Please visit SDS Safety Data Sheet of L-cystine or Cystine or L-Dicysteine Suppliers.
American Molecules, also known as ammol.org is a distributor, supplier and manufacturers' representative of all types of Pharmaceuticals, Functional Ingredients, Excipients and Specialty Chemicals in Texas USA. Our principals manufacture supply and export USP NF BP, Ph Eur, etc grades of chemicals pure and reagent grade, mineral fortifiers, FCC food grade. Tailor made particle size and customized specifications are offered. The principal's facility is having one or more of the certifications like FDA approval and GLP, cGMP, ISO9001, ISO14001, ISO/IEC 17025, ISO22000, FSSC 22000, ISO45001, FSSAI, Kosher, HALAL, COPP, WHO-GMP certified and Written Confirmation (WC) for export to Europe is available. The manufacturers suppliers and exporters observe WHO Good Manufacturing Practices and Good Laboratory Practices.
Suppliers and Manufacturers' Representative:
9910 Bent Oak Dr
Houston, TX 77040, USA
Call Toll Free: 1-855-55-AMMOL 1-855-552-6665
Email: info@ammol.org