Description

(R)-2-Hydroxyethyl-L-Cysteine is a chiral, non-proteinogenic amino acid derivative of significant synthetic and biochemical interest. This compound matters as a versatile building block for the synthesis of more complex molecules, particularly in the development of pharmaceuticals and biochemical probes. Industries that need it include pharmaceutical research for drug discovery, biotechnology for protein engineering, and fine chemical synthesis for creating specialized ligands and chelating agents.

Application

• Pharmaceutical Intermediate: A key chiral synthon in the research and development of novel therapeutic agents, including enzyme inhibitors and receptor modulators.
• Bioconjugation & Protein Labeling: Utilized for site-specific modification of proteins and peptides due to the reactivity of the thiol (-SH) and hydroxyl (-OH) groups.
• Ligand Synthesis for Metal Chelation: Serves as a precursor for creating chelating agents used in catalysis, medical imaging, and metal detoxification.
• Biochemical Research: Employed in studies of enzyme mechanisms, redox biology, and as a component in custom media or buffer formulations.
• Peptide Mimetic Design: Incorporated into peptide analogs to enhance stability, bioavailability, or to introduce specific functional groups.
• Cosmetic & Personal Care Actives: Potential use as a precursor for synthesizing antioxidants or skin-conditioning agents.

Basic Information

Product Name	(R)-2-Hydroxyethyl-L-Cysteine
CAS No.	19179-73-8
Molecular Formula	C5H11NO3S
Molecular Weight	165.21 g/mol
Synonyms	L-Cysteine, S-(2-hydroxyethyl)-, (R)-; (R)-2-(2-Hydroxyethylthio)alanine; (R)-S-(2-Hydroxyethyl)cysteine; (2R)-2-Amino-3-(2-hydroxyethylsulfanyl)propanoic acid; H-Cys(HEt)-OH; (R)-2-Amino-3-((2-hydroxyethyl)thio)propanoic acid; (R)-Thiocysteine ethanol
EINECS	Contact for details

Quality Control

Our (R)-2-Hydroxyethyl-L-Cysteine is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including chiral purity verification by HPLC, to ensure it meets the high standards required for research and synthesis. Certificates of Analysis (COA) detailing identity, purity, and impurity profiles are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect stability and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Chiral Purity (HPLC)	≥ 99.0% ee
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 10 ppm

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