Description

Cysteine Isopropyl Ester is a protected derivative of the essential amino acid L-cysteine, where the thiol group is esterified with isopropanol. This modification enhances its stability and lipophilicity, making it a valuable intermediate in organic synthesis and pharmaceutical manufacturing. It is primarily utilized by research institutions and industrial producers in the life sciences sector for applications ranging from peptide synthesis to the development of novel therapeutic agents.

Application

• Pharmaceutical Intermediate: A key building block in the synthesis of complex peptides, peptidomimetics, and active pharmaceutical ingredients (APIs).
• Bioconjugation Chemistry: Used for site-specific protein and antibody labeling or modification due to its reactive thioester group.
• Research & Development: Serves as a crucial reagent in academic and industrial R&D for studying biochemical pathways and developing new drug candidates.
• Cosmetic Ingredient Synthesis: Employed in the production of advanced skincare actives, such as antioxidants and anti-aging compounds.
• Flavor & Fragrance Industry: Acts as a precursor for creating sulfur-containing flavor compounds and aroma molecules.
• Chemical Biology Probes: Utilized in the design and synthesis of probes for enzyme activity studies and cellular imaging.

Basic Information

Product Name	Cysteine Isopropyl Ester
CAS No.	79178-11-3
Molecular Formula	C6H13NO2S
Molecular Weight	163.24 g/mol
Synonyms	L-Cysteine isopropyl ester; Isopropyl L-cysteinate; (R)-2-Amino-3-mercaptopropanoic acid isopropyl ester; 2-Amino-3-sulfanylpropanoic acid 1-methylethyl ester; Cysteine isopropylester; Isopropyl cysteinate; Cys-OiPr; NSC 334906
EINECS	Contact for details

Quality Control

Our Cysteine Isopropyl Ester is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including HPLC for purity, chiral analysis, and identity confirmation, to ensure it meets the high standards required for research and synthesis. Certificates of Analysis (COA) detailing all specifications are provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at 2-8°C. This product is hygroscopic (moisture-sensitive) and should be handled under an inert atmosphere (e.g., nitrogen or argon) when possible 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]	Contact for details
Water Content (KF)	≤ 1.0%
Heavy Metals	≤ 10 ppm
Residual Solvents (GC)	Meets ICH guidelines

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