Description

D-Cysteine Hydrochloride Monohydrate is the hydrochloride salt of the D-enantiomer of the amino acid cysteine, supplied as a monohydrate crystal. This specific stereoisomer is a valuable chiral building block and biochemical reagent, distinct from its more common L-form counterpart. It is essential for research and production in advanced pharmaceutical synthesis, asymmetric catalysis, and biochemical studies where the D-configuration is required. The product is supplied with a CAS number of 64153-47-5.

Application

• Pharmaceutical Intermediate: A key chiral synthon for the synthesis of active pharmaceutical ingredients (APIs), particularly in the development of novel drugs and peptidomimetics.
• Biochemical Research: Used as a substrate or inhibitor in enzymatic studies and as a component in cell culture media for specialized microbiological applications.
• Asymmetric Synthesis: Serves as a chiral auxiliary or ligand precursor in catalytic asymmetric reactions to induce stereoselectivity.
• Reference Standard: Employed as an analytical standard in chromatography (HPLC, GC) for method development and quality control of enantiomerically pure compounds.
• Nutritional Science Research: Used in metabolic studies investigating the specific biological effects and utilization of D-amino acids.
• Cosmetic Peptide Synthesis: A potential raw material for the synthesis of stabilized peptides used in advanced skincare formulations.

Basic Information

Product Name	D-Cysteine Hydrochloride Monohydrate
CAS No.	64153-47-5
Molecular Formula	C3H7NO2S · HCl · H2O
Molecular Weight	175.63 g/mol
Synonyms	(R)-2-Amino-3-mercaptopropanoic acid hydrochloride monohydrate; D-Cysteine HCl monohydrate; (R)-Cysteine hydrochloride monohydrate; D-2-Amino-3-mercaptopropionic acid hydrochloride monohydrate; D-β-Mercaptoalanine hydrochloride monohydrate; (R)-3-Mercaptoalanine hydrochloride monohydrate; (+)-Cysteine hydrochloride monohydrate
EINECS	Contact for details

Quality Control

Our D-Cysteine Hydrochloride Monohydrate is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing to ensure high purity, correct stereochemistry, and batch-to-batch consistency. We provide full traceability and support our products with detailed Certificates of Analysis (COA) that include results for assay, enantiomeric purity, and related substances by HPLC. Specifications can meet the requirements for research and commercial applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and should be handled in a dry atmosphere to prevent clumping or decomposition. For long-term storage, consider using desiccants.

Specification

Item	Specification
Appearance	White to almost white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥98.0%
Enantiomeric Purity (HPLC)	≥99.0% (D-isomer)
Specific Rotation [α]20/D	+8.0° to +10.0° (c=1 in H2O)
Water Content (KF)	8.0% - 10.5%
Residue on Ignition	≤0.1%
Heavy Metals (as Pb)	≤10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.