Description

Sulfapyrazole-13C6 CAS NO 1420043-51-1 is a stable isotope-labeled analog of the sulfonamide antibiotic sulfapyrazole, where six carbon atoms are replaced with the carbon-13 isotope. This compound is critically important as an internal standard in quantitative mass spectrometry, enabling highly accurate and precise bioanalytical measurements. It is primarily needed by pharmaceutical research laboratories, contract research organizations (CROs), and analytical testing facilities engaged in drug metabolism and pharmacokinetics (DMPK) studies, clinical research, and forensic toxicology.

Application

• Internal Standard for LC-MS/MS quantification of sulfapyrazole in biological matrices (plasma, serum, urine).
• Metabolite identification and profiling studies in pharmaceutical R&D.
• Use in pharmacokinetic (PK) and bioavailability studies to ensure data accuracy.
• High-precision calibration for regulatory bioanalytical method development and validation.
• Reference material for forensic analysis and anti-doping testing.
• Stable Isotope Dilution Assay (SIDA) for absolute quantification in complex samples.

Basic Information

Product Name	Sulfapyrazole-13C6
CAS No.	1420043-51-1
Molecular Formula	C513C6H14N4O2S
Molecular Weight	~280.3 g/mol (for 13C6 labeled form)
Synonyms	4-Amino-N-(1-phenyl-1H-pyrazol-5-yl)benzenesulfonamide-13C6; 13C6-Sulfapyrazole; Sulfapyrazole (phenyl-13C6); Sulfapyrazole-13C6 (phenyl ring labeled); Stable Isotope Labeled Sulfapyrazole; Sulfapyrazole Internal Standard; [13C6]-Sulfapyrazole; Sulfapyrazole (13C6)
EINECS	Contact for details

Quality Control

Our Sulfapyrazole-13C6 is manufactured under strict quality control protocols to ensure the highest isotopic and chemical purity required for sensitive analytical applications. Each batch is characterized by advanced spectroscopic and chromatographic techniques, including NMR, HPLC, and mass spectrometry, to confirm isotopic enrichment and chemical identity. A comprehensive Certificate of Analysis (COA) detailing purity, isotopic purity, and analytical data is 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 material is hygroscopic (moisture-sensitive) and should be handled in a dry environment to prevent degradation. For long-term storage, consider desiccant in the container.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Identification (MS)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Isotopic Purity	≥ 99 atom % 13C
Chemical Purity	≥ 95%
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.1%

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