Description

D-Cysteine Hydrochloride is the hydrochloride salt of the D-enantiomer of the amino acid cysteine, a critical chiral building block. This high-purity, non-natural isomer is essential for applications requiring specific stereochemistry, such as in pharmaceutical synthesis and biochemical research. It is particularly valuable for the production of chiral drugs, peptide synthesis, and as a precursor in the manufacture of specialized supplements and diagnostic agents where the L-form is not suitable.

Application

• Pharmaceutical Intermediate: Key chiral synthon for the research and production of active pharmaceutical ingredients (APIs), especially those requiring D-configured amino acids.
• Biochemical Research: Used in enzymatic studies, metabolic pathway analysis, and as a standard in chromatographic separation techniques for amino acid analysis.
• Peptide Synthesis: Serves as a protected amino acid derivative in solid-phase and solution-phase peptide synthesis to introduce specific stereocenters.
• Nutritional Science: Investigated for use in specialized dietary formulations and metabolic studies where the distinct properties of the D-enantiomer are required.
• Cosmetic Ingredients: Potential precursor for synthesizing certain active compounds in high-end skincare products.
• Diagnostic Reagents: Employed in the formulation of reagents and kits for clinical diagnostics and biochemical assays.

Basic Information

Product Name	D-Cysteine Hydrochloride
CAS No.	32443-99-5
Molecular Formula	C3H8ClNO2S
Molecular Weight	157.62 g/mol
Synonyms	(R)-2-Amino-3-mercaptopropanoic acid hydrochloride; D-Cysteine HCl; (R)-Cysteine hydrochloride; D-2-Amino-3-sulfhydrylpropionic acid hydrochloride; D-β-Mercaptoalanine hydrochloride; (R)-3-Mercaptoalanine hydrochloride; D-Cys·HCl
EINECS	251-038-4

Quality Control

Our D-Cysteine Hydrochloride is manufactured under strict quality management systems. Each batch is subjected to comprehensive analytical testing, including chiral purity verification, to ensure it meets stringent specifications for pharmaceutical and research applications. Certificates of Analysis (COA) detailing purity, enantiomeric excess, and impurity profiles are provided to guarantee traceability and consistency.

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). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥98.0%
Enantiomeric Purity	≥99.0% (D-isomer)
Specific Rotation [α]20/D	-5.0° to -7.0° (c=1 in H2O)
Loss on Drying	≤0.5%
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.