Description

L-Cysteine, S-Acetyl- CAS NO 15312-11-5 is a chemically modified derivative of the amino acid L-Cysteine, featuring an acetyl group protecting its thiol functionality. This modification enhances stability and bioavailability, making it a crucial intermediate for advanced biochemical synthesis and pharmaceutical applications. It is primarily sought by manufacturers in the pharmaceutical, nutraceutical, and research sectors for the production of active pharmaceutical ingredients (APIs), peptide synthesis, and as a precursor in metabolic studies.

Application

• Pharmaceutical Intermediate: Key building block for synthesizing more complex APIs and peptide-based drugs.
• Nutraceutical & Dietary Supplement: Used as a stable, bioavailable source of L-Cysteine in advanced supplement formulations.
• Biochemical Research: Essential reagent in proteomics, enzymology, and metabolic pathway studies.
• Cosmetic & Personal Care: Incorporated into formulations for hair care and skin conditioning products due to its thiol properties.
• Food & Flavor Industry: Acts as a processing aid and precursor for certain flavor compounds.
• Cell Culture Media: Component in specialized media for biotechnology and cell culture applications.

Basic Information

Product Name	L-Cysteine, S-Acetyl-
CAS No.	15312-11-5
Molecular Formula	C5H9NO3S
Molecular Weight	163.20 g/mol
Synonyms	S-Acetyl-L-cysteine; N-Acetyl-L-cysteine (Note: This is a common misnomer, the correct IUPAC is S-Acetyl-L-cysteine); (R)-2-Acetamido-3-mercaptopropanoic acid S-acetate; Acetylcysteine (S-acetyl derivative); L-Cysteine S-acetate; NSC 113939; AC-CYS-OH; S-Acetylcysteine
EINECS	239-357-4

Quality Control

Our L-Cysteine, S-Acetyl- is produced under strict quality management systems. Each batch undergoes comprehensive analytical testing, including HPLC for purity, chiral analysis, and residual solvent screening, to ensure it meets high-purity standards suitable for pharmaceutical and research applications. 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 a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and must be kept under dry conditions to prevent degradation. For long-term storage, consider using a desiccant in the container.

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 H2O)
Loss on Drying	≤1.0%
Residue on Ignition	≤0.1%
Heavy Metals (as Pb)	≤10 ppm
Related Substances (HPLC)	Total impurities ≤2.0%

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