Description

Procysteine is a high-purity, specialized derivative of the amino acid cysteine, widely recognized for its role as a precursor in biochemical synthesis and as a key intermediate in pharmaceutical manufacturing. Its primary value lies in its ability to act as a protected thiol source, offering enhanced stability and controlled reactivity compared to free cysteine, which is critical for sensitive synthetic processes. This compound is essential for research institutions, fine chemical producers, and pharmaceutical companies engaged in the development of peptides, active pharmaceutical ingredients (APIs), and nutritional supplements.

Application

• Pharmaceutical Intermediate: A crucial building block in the synthesis of complex drug molecules, particularly those containing disulfide bonds or requiring thiol protection strategies.
• Biochemical Research: Used as a reagent in proteomics, enzymology, and cell culture studies to investigate thiol-disulfide exchange reactions and redox biology.
• Peptide Synthesis: Serves as a protected cysteine derivative in solid-phase and solution-phase peptide synthesis to prevent unwanted oxidation or side reactions.
• Nutritional & Cosmetic Formulations: Employed as a stable source of cysteine in advanced nutritional supplements and in cosmetic products for its potential antioxidant properties.
• Chemical Synthesis: Acts as a chiral synthon and nucleophile in asymmetric synthesis for creating sulfur-containing organic compounds.

Basic Information

Item	Details
Product Name	Procysteine
CAS No.	19771-63-2
Molecular Formula	C6H12N2O3S
Molecular Weight	192.23 g/mol
Synonyms	L-Procysteine; N-(Phenylmethoxycarbonyl)-L-cysteine; Z-Cys-OH; N-Carbobenzoxy-L-cysteine; N-Cbz-L-cysteine; (R)-2-((((Benzyloxy)carbonyl)amino)-3-mercaptopropanoic acid; NSC 334363; CBZ-Cysteine
EINECS	243-300-9

Quality Control

Our Procysteine is manufactured under strict quality management systems. Each batch is subjected to comprehensive analytical testing, including HPLC for purity, optical rotation for chiral integrity, and residual solvent analysis. We provide full traceability and Certificates of Analysis (COA) are available for every shipment, ensuring compliance with relevant standards for research and pharmaceutical intermediate use.

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 degradation from atmospheric moisture. For long-term storage, consider using desiccants.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Optical Rotation [α]	-30.0° to -35.0° (c=1 in 1N HCl)
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm

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