Description

S-Methyl-L-Cysteine is a sulfur-containing amino acid derivative, specifically the S-methylated form of L-cysteine. This compound is valued for its role as a biochemical precursor and a building block in peptide synthesis and pharmaceutical research. It is primarily utilized by research institutions, pharmaceutical developers, and fine chemical manufacturers engaged in advanced organic synthesis and metabolic studies.

Application

• Pharmaceutical Intermediate: Serves as a key chiral building block in the synthesis of novel drug candidates and bioactive peptides.
• Biochemical Research: Used as a substrate or standard in enzymatic studies, metabolic pathway analysis, and proteomics research.
• Nutritional Science: Investigated for its potential role in sulfur amino acid metabolism and related nutritional applications.
• Cosmetic Ingredient: Employed in the formulation of high-end skincare products for its potential antioxidant and skin-conditioning properties.
• Organic Synthesis: Acts as a versatile reagent for introducing protected thioether functionalities into complex organic molecules.

Basic Information

Product Name	S-Methyl-L-Cysteine
CAS No.	1187-84-4
Molecular Formula	C4H9NO2S
Molecular Weight	135.19 g/mol
Synonyms	(S)-2-Amino-3-(methylthio)propanoic acid; L-2-Amino-3-(methylthio)propionic acid; S-Methylcysteine; Methyl-L-cysteine; (S)-2-Amino-3-(methylmercapto)propionic acid; NSC 52413; L-S-Methylcysteine
EINECS	214-701-4

Quality Control

Our S-Methyl-L-Cysteine is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including chiral purity verification and impurity profiling, to ensure it meets the high standards required for research and synthesis. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming identity, purity, and compliance with relevant specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at controlled room temperature (15-25°C). The product is hygroscopic (moisture-sensitive) and should be handled in a dry environment to prevent degradation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥98.0%
Optical Rotation [α]20/D	-30.0° to -34.0° (c=1 in 1N HCl)
Loss on Drying	≤1.0%
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.