Description

L-Cysteine (13C3) is a stable isotope-labeled analog of the essential amino acid L-Cysteine, where three carbon atoms are replaced with the 13C isotope. This product is critical for use as an internal standard in quantitative mass spectrometry, enabling highly accurate and precise measurements in complex biological matrices. It is primarily utilized by researchers and quality control laboratories in the pharmaceutical, biotechnology, and clinical diagnostics industries for advanced metabolic studies, proteomics, and drug development.

Application

• Internal Standard for LC-MS/MS and GC-MS quantitative analysis in pharmacokinetic and bioanalytical studies.
• Tracer compound in metabolic flux analysis and isotope labeling experiments to study cysteine metabolism.
• Critical reagent for developing and validating diagnostic assays in clinical research.
• Use in proteomics research for protein quantification and turnover studies.
• High-purity standard for calibrating analytical instruments in pharmaceutical quality control labs.
• Biochemical research into oxidative stress, redox biology, and glutathione synthesis pathways.

Basic Information

Product Name	L-Cysteine (13C3)
CAS No.	202114-66-7
Molecular Formula	C313C3H7NO2S
Molecular Weight	124.13 g/mol (for 13C3 labeled form)
Synonyms	(2R)-2-Amino-3-sulfanylpropanoic-13C3 acid; L-Cysteine-13C3; 13C3-L-Cysteine; Cysteine-13C3; (R)-2-Amino-3-mercaptopropionic-13C3 acid; 3,3,3-13C3-L-Cysteine; Stable Isotope Labeled L-Cysteine; Cys-13C3
EINECS	Contact for details

Quality Control

Every batch of our L-Cysteine (13C3) is manufactured under strict quality systems and undergoes comprehensive analytical testing. We guarantee high chemical purity and isotopic enrichment to meet the exacting requirements of analytical research. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming specifications for identity, purity (by HPLC), isotopic purity, and related substances.

Storage

Preserve in a tightly closed container, protected from light. Store at 2-8°C. This material is hygroscopic (moisture-sensitive) and easily oxidized; for long-term storage, it is recommended to keep the container under an inert atmosphere such as nitrogen or argon.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Isotopic Purity (13C3)	≥ 99 atom % 13C
Optical Rotation	Specific range provided on COA
Water Content (KF)	≤ 1.0%
Heavy Metals	≤ 10 ppm

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