Description

Cysteinyldopa CAS NO 19641-92-0 is a sulfur-containing amino acid derivative and a key intermediate metabolite in the melanin biosynthesis pathway. This compound is of significant interest in biochemical research and diagnostic applications due to its role as a precursor to pheomelanin. It is primarily utilized by research institutions, diagnostic manufacturers, and pharmaceutical developers focused on dermatology, pigment disorders, and metabolic studies.

Application

• Biochemical Research: Critical intermediate for studying the tyrosine-melanin pathway and the mechanisms of pheomelanin and eumelanin synthesis.
• Diagnostic Reagent Manufacturing: Used in the development and calibration of assays for detecting melanin-related metabolites in biological fluids.
• Pharmaceutical Reference Standard: Serves as a high-purity standard for quality control in the production of drugs targeting pigmentation.
• Dermatological Studies: Employed in in-vitro models to investigate skin pigmentation, vitiligo, and melanoma.
• Metabolic Pathway Analysis: A tool for elucidating catecholamine and neuromelanin metabolism in neurological research.

Basic Information

Product Name	Cysteinyldopa
CAS No.	19641-92-0
Molecular Formula	C9H12N2O4S
Molecular Weight	244.27 g/mol
Synonyms	5-S-Cysteinyldopa; L-Cysteinyldopa; 2-S-Cysteinyldopa; 5-S-Cys-DOPA; 2-Amino-3-(5-S-cysteinyl-3,4-dihydroxyphenyl)propanoic acid; 3-(3,4-Dihydroxyphenyl)-2-[(2-amino-2-carboxyethyl)thio]-L-alanine; Cys-DOPA
EINECS	243-197-2

Quality Control

Our Cysteinyldopa is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via IR and NMR spectroscopy, to ensure it meets the high standards required for research and diagnostic applications. A detailed Certificate of Analysis (COA) is provided with every shipment, guaranteeing traceability and consistent quality.

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 property of being easily oxidized, long-term storage under an inert atmosphere (e.g., nitrogen or argon) is recommended for optimal stability.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Identification (HPLC)	Conforms to reference
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.5%
Heavy Metals	≤ 20 ppm

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