L-Cysteine HCL Monohydrate USP

Synonyms

l-cysteine hydrochloride monohydrate, cysteine hydrochloride monohydrate

Technical Data

CAS Number: 7048-04-6
Molecular Formula: HSCH₂CH(NH₂)COOH · HCl · H₂O
Molecular Weight: 175.63
Beilstein Registry Number: 5158059
EC Number: 200-157-7

FabriChem Specifications

ITEM	SPECIFICATION
Appearance	White powder
Identification	As per USP36
Specific Rotation	+5.7° to +6.8°
Loss on Drying	8.0 to 12.0%
Residue on Ignition	NMT 0.4%
Sulfate	NMT 0.03%
Iron	NMT 0.003%
Heavy Metals	NMT 0.0015%
Total Impurities	NMT 2.0%
Each Individual Impurity	NMT 0.5%
Organic Volatile Impurities	As per USP36
Residual Solvents	As per USP36
Assay	98.5 to 101.5%
Microbiology:
Total Plate Count	NMT 1,000 CFU/g
Yeast & Mold	NMT 100 CFU/g
E. Coli	Negative
Salmonella	Negative
Staph. Aureus	Negative/10g

Molecular Structure

l-cysteine-hcl-monohydrate-structure

About

Cysteine is a sulfur-containing amino acid found in foods like poultry, eggs, dairy, red peppers, garlic and onions. It works as an antioxidant, in the production of collagen (a component of hair, skin and nails) and is also used in the body to create glutathione, another important antioxidant.

L-Cysteine is a non-essential standard amino acid that can be synthesized by the human body under normal physiological conditions if a sufficient quantity of methionine is available.

In the cosmetics industry, it can be used for hair perming formulations.