MQCA

3-Methylquinoxaline-2-carboxylic acid

MQCA (CAS 74003-63-7) is a high-purity reference standard produced and distributed by WITEGA Laboratorien Berlin-Adlershof GmbH. As an LC-MS/MS reference material and GC-MS calibration solution, it supports confident identification and accurate quantification in complex matrices. Therefore, it fits seamlessly into regulated workflows and routine residue monitoring.

Use this reference standard for calibration curves, system suitability, and instrument performance checks. It provides traceability for LC-MS/MS or GC-MS methods, from single-analyte assays to multi-residue panels. Moreover, it streamlines method validation and confirmatory analysis by ensuring consistent response and defined purity.

Typical applications include:

• Regulated laboratories performing food and feed residue control.
• Pharmaceutical research focused on quinoxaline metabolites and pathways.
• Metabolism studies requiring reliable quantification across tissues and fluids.
• Multi-residue method development with matrix-matched calibration.
• Confirmatory analysis to verify screening positives with robust criteria.

Key advantages:

• High lot-to-lot consistency for reproducible results.
• Traceable preparation suitable for calibration and quality control.
• Optimized for LC-MS/MS and compatible with GC-MS workflows.
• Clear labeling and documentation to support audits.
• Convenient handling for spiking experiments and recovery studies.

The MQCA (CAS 74003-63-7) reference standard helps laboratories build defensible data. Additionally, it enables efficient transfers between sites and instruments through harmonized calibration files and stable response factors. Choose it to improve accuracy, save time, and meet strict regulatory expectations.

You can download your Safety Data Sheet for OP173

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