Description

L-Cysteine Isopropyl Ester Hydrochloride is a protected derivative of the essential amino acid L-Cysteine, designed to enhance stability and bioavailability. This compound is a critical building block in peptide synthesis and pharmaceutical research, offering a reactive thiol group masked for controlled deprotection. It is primarily utilized by research institutions, pharmaceutical manufacturers, and fine chemical producers engaged in developing novel therapeutic peptides, prodrugs, and biochemical tools.

Application

• Pharmaceutical Intermediates: Key raw material in the synthesis of complex peptide-based drugs and active pharmaceutical ingredients (APIs).
• Peptide Synthesis: Serves as a protected cysteine residue in Solid-Phase Peptide Synthesis (SPPS) and solution-phase methodologies.
• Biochemical Research: Used as a substrate or precursor in enzymatic studies and proteomics research.
• Prodrug Development: Employed to create ester prodrugs to improve the pharmacokinetic properties of therapeutic agents.
• Cosmetic & Personal Care: Potential ingredient in advanced hair care and skin formulations where stabilized cysteine derivatives are beneficial.
• Food & Nutritional Science: Investigated for use in specialized nutritional supplements and flavor enhancers.

Basic Information

Product Name	L-Cysteine Isopropyl Ester Hydrochloride
CAS No.	73255-49-9
Molecular Formula	C6H14ClNO2S
Molecular Weight	199.70 g/mol
Synonyms	L-Cysteine isopropyl ester HCl; (R)-2-Amino-3-mercaptopropanoic acid isopropyl ester hydrochloride; Isopropyl L-cysteinate hydrochloride; H-Cys-OiPr·HCl; Cysteine isopropylester hydrochloride; S-Cysteine isopropyl ester hydrochloride; L-α-Amino-β-thiolpropionic acid isopropyl ester hydrochloride
EINECS	Contact for details

Quality Control

Our L-Cysteine Isopropyl Ester Hydrochloride is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including chiral purity verification, to ensure it meets the high standards required for pharmaceutical and research applications. A Certificate of Analysis (COA) detailing specific results for assay, optical rotation, and impurity profiles is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and should be handled under anhydrous conditions to maintain stability and purity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥98.0%
Optical Rotation [α]	Specific range provided on COA
Water Content (KF)	≤1.0%
Heavy Metals	≤20 ppm
Residue on Ignition	≤0.5%

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