Description

4-Aminobenzoic Acid-13C6 E is a stable isotope-labeled analog of para-aminobenzoic acid (PABA), where six carbon atoms are replaced with the 13C isotope. This compound is essential as an internal standard in quantitative mass spectrometry, enabling highly accurate and precise measurements in complex biological and chemical matrices. It is primarily required by analytical laboratories and research institutions in the pharmaceutical, agrochemical, and life science sectors for method development, validation, and high-throughput analysis.

Application

• Used as an internal standard for the accurate quantification of PABA and related metabolites in LC-MS and GC-MS bioanalytical assays.
• Critical in pharmaceutical research for pharmacokinetic (PK) and pharmacodynamic (PD) studies, drug metabolism, and bioavailability testing.
• Facilitates metabolomics and proteomics research by providing a stable isotope reference for pathway analysis and biomarker discovery.
• Applied in environmental analysis for tracing and quantifying PABA derivatives in soil and water samples.
• Supports nutritional science studies investigating folate metabolism and vitamin synthesis where PABA is a precursor.
• Enables quality control in the manufacturing of sunscreens and cosmetic products containing PABA derivatives.

Basic Information

Product Name	4-Aminobenzoic Acid-13C6 E
CAS No.	1391054-61-7
Molecular Formula	13C6H7NO2
Molecular Weight	143.09 (based on 13C)
Synonyms	PABA-13C6; 4-Amino[13C6]benzoic Acid; [13C6]-4-Aminobenzoic Acid; para-Aminobenzoic Acid-13C6; Vitamin Bx-13C6; 4-Carboxyaniline-13C6; 4-Amino-1-carboxybenzene-13C6; Benzoic acid, 4-amino- (13C6)
EINECS	Contact for details

Quality Control

Our 4-Aminobenzoic Acid-13C6 E is manufactured under strict quality systems to ensure the highest isotopic and chemical purity for critical research applications. Each batch is supported by a comprehensive Certificate of Analysis (COA) detailing isotopic enrichment (typically >99 atom % 13C), chemical purity (by HPLC), and confirming identity and absence of impurities. We adhere to relevant standards for stable isotope-labeled compounds to ensure reliable and reproducible analytical results.

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 in a desiccated environment to maintain stability and purity. Handle under an inert atmosphere if prolonged exposure is anticipated during use.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Identification (MS)	Conforms to structure
Isotopic Enrichment	≥ 99 atom % 13C
Chemical Purity (HPLC)	≥ 98.0%
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

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