Analysis of 14 Positional Isomers Using a Core Enhanced Technology Accucore HPLC Column

Significance of the Topic

The separation of positional isomers is critical in fields ranging from pharmaceutical development to environmental analysis. Isomers often exhibit different biological activities or toxicities, making high-selectivity, rapid methods essential for accurate identification and quantification.

Objectives and Study Overview

This application note compares the performance of a pentafluorophenyl fused core column versus a conventional C18 column in resolving 14 positional isomers. The study aims to demonstrate enhanced selectivity, peak shape, and analysis speed using Core Enhanced Technology.

Methodology and Instrumentation

Primary standards of each isomer were prepared at 1 mg/mL in acetonitrile and diluted to a working concentration of 50 µg/mL in the mobile phase.

• Columns tested
  • Accucore PFP 2.6 µm, 100 × 2.1 mm
  • Accucore C18 2.6 µm, 100 × 2.1 mm
• Chromatographic conditions
  • System: Thermo Scientific Accela HPLC
  • Column temperature: 50 °C
  • Flow rate: 0.6 mL/min
  • Injection volume: 2 µL
  • Detection: UV at 270 nm
  • Mobile phase A: 0.1 % formic acid in water
  • Mobile phase B: 0.1 % formic acid in acetonitrile
  • Gradient: 15 % to 30 % B over 7 minutes

Main Results and Discussion

The PFP column separated all 14 isomers in under 8 minutes with sharp, symmetric peaks (asymmetry factors ~1.02–1.08). The C18 column required 9 minutes for elution and showed reduced resolution for certain isomer pairs. Enhanced interactions between fluorinated stationary phase and aromatic ring substituents provided superior selectivity on the PFP phase.

Benefits and Practical Applications

Use of the Accucore PFP column offers:

• Faster throughput with total run times below 8 minutes
• Improved resolution of closely related positional isomers
• Robust peak shapes and consistent retention

This makes the method ideal for high-throughput QA/QC in pharmaceutical, agrochemical, and environmental laboratories.

Future Trends and Applications

Advances in fused core particle design and novel stationary phases may further reduce analysis times and enhance selectivity for complex mixtures. Integration with mass spectrometry and automated sample preparation can expand applications in trace analysis and metabolomics.

Conclusion

The Accucore PFP column demonstrates superior selectivity and speed for resolving 14 positional isomers compared to a traditional C18 phase, enabling high-throughput, reliable analyses in diverse analytical settings.

References

• Gartland J. Analysis of 14 Positional Isomers Using Accucore PFP HPLC Column. Thermo Fisher Scientific Application Note ANCCSCETISOMER.