Resolution of Benzene Polycarboxylic Acids on a Thermo Scientific ™ Acclaim™ Organic Acid (OA) Column

Significance of the topic

Benzene polycarboxylic acids are key analytes in environmental monitoring, industrial process control, and quality assurance. Their structural similarity and high polarity make chromatographic separation challenging. Reliable resolution of these compounds supports accurate quantitation and compound identification across various analytical contexts.

Objectives and study overview

This study evaluated the performance of the Thermo Scientific™ Acclaim™ Organic Acid (OA) column for baseline separation of five isomeric benzene polycarboxylic acids. The goal was to establish a fast, reproducible method suitable for routine analysis.

Methodology and instrumentation

• Column: Thermo Scientific™ Acclaim™ OA, 5 µm, 4 × 150 mm
• Mobile phase: 12.5% acetonitrile / 87.5% water (v/v) with 5 mM methanesulfonic acid
• Temperature: 30 °C
• Flow rate: 0.75 mL/min
• Injection volume: 5 µL
• Detection: UV at 230 nm

Main results and discussion

The method achieved baseline separation of 1,2​-benzenetricarboxylic acid, 1,2​-benzenedicarboxylic acid, 1,3,5​-benzenetricarboxylic acid, 1,4​-benzenedicarboxylic acid, and 1,3​-benzenedicarboxylic acid (50 ppm each) in under 20 minutes. Peak shapes were sharp and symmetric, reflecting effective suppression of ionization by methanesulfonic acid. Retention order correlated with the number and positions of carboxyl groups.

Benefits and practical applications

• Rapid, isomer-selective separation without ion-pair reagents
• High reproducibility suitable for QA/QC laboratories
• Direct compatibility with routine UV detection
• Applicability to environmental, food, and pharmaceutical analyses

Future trends and potential applications

Integration with mass spectrometric detection could enhance sensitivity and specificity. Further method optimization, including gradient elution or shorter column formats, may reduce run times. Expansion to other organic acid classes and high-throughput screening workflows is anticipated.

Conclusion

The Thermo Scientific Acclaim OA column offers an efficient reversed-phase approach for resolving benzene polycarboxylic acids, delivering robust, high-resolution separations ideal for routine analytical workflows.

Reference

Thermo Fisher Scientific Inc. Application note 20021, 2009.