Description

n-Acetyl-S-(2-Cyanoethyl)-L-Cysteine Ammonium Salt is a high-purity, chemically defined derivative of L-cysteine, specifically designed for advanced research and analytical applications. This compound matters as a critical reference standard and metabolite in toxicology and pharmaceutical studies, particularly for monitoring exposure to acrylonitrile and related nitriles. It is essential for analytical chemists, toxicologists, and researchers in contract research organizations (CROs), pharmaceutical development, and occupational health and safety sectors requiring precise biomarker analysis.

Application

• Biomarker Reference Standard: Primary use as a certified reference material (CRM) for the quantification of S-(2-cyanoethyl)cysteine mercapturic acid, a key urinary metabolite of acrylonitrile, in biological monitoring programs.
• Toxicology & Metabolite Research: Fundamental reagent in studies investigating the metabolic pathways, pharmacokinetics, and biomonitoring of acrylonitrile and other vinyl cyanides.
• Analytical Method Development & Validation: Critical for developing and calibrating highly sensitive analytical methods such as LC-MS/MS, HPLC-UV, and GC-MS in clinical and forensic toxicology laboratories.
• Occupational Health & Safety Compliance: Used to establish and verify analytical protocols for monitoring worker exposure to acrylonitrile in industrial settings, supporting regulatory compliance (e.g., OSHA, EU directives).
• Pharmaceutical Impurity Profiling: Serves as a specific standard in impurity identification and control strategies for pharmaceuticals where related nitrile compounds may be present.

Basic Information

Product Name	n-Acetyl-S-(2-Cyanoethyl)-L-Cysteine Ammonium Salt
CAS No.	168208-30-8
Molecular Formula	C8H15N3O3S • xNH3
Molecular Weight	~249.3 g/mol (Free acid, C8H13N3O3S)
Synonyms	N-Acetyl-S-(2-cyanoethyl)cysteine ammonium salt; N-Acetyl-S-(2-cyanoethyl)-L-cysteine ammonium salt; Acetyl-S-(2-cyanoethyl)cysteine ammonium salt; S-(2-Cyanoethyl)-N-acetyl-L-cysteine ammonium salt; N-Acetyl-3-[(2-cyanoethyl)sulfanyl]-L-alanine ammonium salt; AcCys(CyEt)NH4; Ac-Cys(CyEt)-OH • NH3; Mercapturic acid of acrylonitrile (ammonium salt)
EINECS	Contact for details

Quality Control

Our n-Acetyl-S-(2-Cyanoethyl)-L-Cysteine Ammonium Salt is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including chiral purity verification and quantification of the ammonium salt content, to ensure it meets the exacting standards required for reference materials. A comprehensive Certificate of Analysis (COA) is provided, detailing identity (IR, NMR), purity (HPLC), and specific tests for related substances and residual solvents, supporting traceability and method validation in GLP/GMP environments.

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). For long-term storage, consider desiccation. Keep container tightly sealed when not in use to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Identification (NMR)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Chiral Purity	≥ 99.0% L-isomer
Water Content (KF)	≤ 2.0%
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 2.0%
Assay (Ammonium Salt Content)	95.0% - 105.0% of theoretical

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