Comparison of Five Acclaim Reversed-Phase Columns for the Separation of NITC Derivatives of Volatile Amines

Significance of the Topic

Volatile amines like ethylenediamine, diethylenetriamine and triethylenetetramine are common in industrial environments and pose respiratory and dermal hazards. Accurate monitoring of airborne amines is essential for occupational safety and compliance with regulatory limits.

Study Objectives and Overview

This work evaluates performance of five Thermo Scientific Acclaim reversed-phase columns for separating NITC-derivatized volatile amines. The aim was to identify column chemistries that provide optimal resolution, run time, and robustness for routine laboratory analysis under a standardized gradient method.

Instrumentation

• Liquid Chromatograph: Thermo Scientific Dionex UltiMate 3000 LC system
• Columns (3 µm, 3 x 150 mm): Acclaim 120 C18, Acclaim C30, Acclaim PolarAdvantage, Acclaim PolarAdvantage II, Acclaim 120 C8
• Mobile Phase: A—Methanol; B—10 mM formic acid; gradient from 50/50 to 100/0 over 7 minutes at 0.425 mL/min
• Column Temperature: 30 °C; Injection Volume: 1.0 µL
• Detection: Diode array (200-600 nm), quantification at 280 nm

Key Results and Discussion

• All columns achieved separation of NITC derivatives of the three amines with varying selectivity and resolution.
• C18 and C30 phases delivered baseline resolution and sharp peaks, with C30 showing slightly extended retention times due to increased hydrophobicity.
• PolarAdvantage and PolarAdvantage II phases provided altered elution order and improved retention for polar derivative NITC, facilitating alternative selectivity profiles.
• The C8 column offered the fastest run times but reduced peak capacity, making it suitable for high-throughput screening where minimal resolution is acceptable.

Benefits and Practical Applications of the Method

• The reversed-phase approach is compatible with standard UV detectors and ambient laboratory conditions, simplifying adoption from normal-phase methods.
• High resolution of common volatile amine derivatives supports accurate quantification in workplace air monitoring.
• Flexible column choice allows laboratories to tailor selectivity and throughput to specific analytical requirements.

Future Trends and Opportunities

• Integration with mass spectrometry for enhanced sensitivity and compound confirmation.
• Development of shorter columns and advanced stationary phases for ultrafast analyses.
• Automation of sampling and derivatization steps for online monitoring applications.

Conclusion

Reversed-phase LC using Thermo Scientific Acclaim columns delivers robust and versatile separation of NITC-derivatized volatile amines. Column chemistry choices enable laboratories to balance resolution, run time, and selectivity to meet rigorous occupational monitoring needs.

References

• Thermo Fisher Scientific. Application note PB20616_E titled Comparison of Five Acclaim Reversed-Phase Columns for the Separation of NITC Derivatives of Volatile Amines, 2012.
• U.S. Occupational Health and Safety Administration. Standard methods for volatile amine monitoring.