Description

Methyl Dl-Cysteinate CAS NO 44641-43-2 is a synthetic derivative of the amino acid cysteine, specifically the methyl ester of its racemic (DL) form. This compound serves as a versatile and reactive building block in organic synthesis and pharmaceutical research, offering a protected thiol group for further chemical modifications. It is primarily utilized by research institutions, pharmaceutical development labs, and fine chemical manufacturers involved in peptide synthesis, drug discovery, and the production of biochemical intermediates.

Application

• Pharmaceutical Intermediate: A key precursor in the synthesis of more complex cysteine derivatives, active pharmaceutical ingredients (APIs), and prodrugs.
• Peptide Synthesis: Used as a protected cysteine analog in solid-phase and solution-phase peptide synthesis to introduce thiol functionality.
• Biochemical Research: Employed in studies of enzyme mechanisms, redox biology, and as a model compound for investigating thiol-disulfide exchange reactions.
• Chemical Synthesis: Acts as a nucleophile or ligand in organic transformations and metal complexation due to its reactive thiolate group.
• Cosmetic & Personal Care Ingredients: Potential intermediate in the manufacture of hair care and skin care actives that leverage cysteine's properties.

Basic Information

Product Name	Methyl Dl-Cysteinate
CAS No.	44641-43-2
Molecular Formula	C4H9NO2S
Molecular Weight	135.18 g/mol
Synonyms	DL-Cysteine methyl ester; Methyl DL-cysteine ester; (±)-Cysteine methyl ester; H-Cys-OMe; 2-Amino-3-mercaptopropionic acid methyl ester; Methyl 2-amino-3-mercaptopropanoate; Racemic cysteine methyl ester
EINECS	Contact for details

Quality Control

Our Methyl Dl-Cysteinate is produced under strict quality management protocols. Each batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing specifications such as assay (by HPLC), chiral purity, and residual solvents are provided and available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at controlled room temperature (15-25°C). Due to its hygroscopic and potentially light-sensitive nature, prolonged exposure to moisture, air, or light should be avoided to maintain stability.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Optical Purity (Chiral HPLC)	DL-mixture (Racemic)
Loss on Drying	≤ 1.0%
Residual Solvents (GC)	Complies with ICH guidelines

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