Guidelines for method transfer and optimization—from earlier model Corona detectors to Corona Veo and Vanquish charged aerosol detectors

Significance of the topic

Charged aerosol detection (CAD) plays a critical role in quantifying non-volatile and semi-volatile compounds in liquid chromatography, supporting applications across pharmaceutical, environmental and food analysis. Upgrading from legacy Corona detectors to the latest Corona Veo and Vanquish CAD models enhances sensitivity, dynamic range and method robustness.

Objectives and overview of the article

This technical note outlines practical guidelines for transferring existing CAD methods from early model Corona detectors to Thermo Scientific™ Corona Veo™ and Vanquish™ charged aerosol detectors. It covers initial instrument settings, key optimization strategies and calibration approaches to achieve equivalent or improved performance.

Methodology and instrumentation

Recommended starting conditions for Corona Veo and Vanquish CAD:

• Evaporation temperature (Evap T): 35 °C
• Power function value (PFV): 1.0
• Filter time constant: 5.0 seconds

Instrument models discussed include Corona Veo CAD and Vanquish CAD VH-D20-A/VF-D20-A. A mapping table aligns filter settings from earlier Corona and Corona ultra RS detectors to the new systems.

Main results and discussion

• Baseline and noise characteristics are higher on Veo and Vanquish CAD compared to older Corona units due to improved low-end sensitivity and lack of non-linear drop-off.
• Evap T optimization: start at 35 °C, screen at 35 and 40 °C, adjust in 5 °C increments. Lower Evap T may benefit semi-volatile analytes but can increase noise.
• PFV settings: use PFV=1.0 initially. Values >1.0 extend linear dynamic range; values <1.0 may improve linearity for semi-volatile compounds over narrow ranges.
• Filter time constant: choose settings that match earlier detector response by referring to the provided matrix (0.1–10.0 seconds). Ensure filter choice balances noise reduction with response fidelity.
• Always verify limits of detection and quantitation by analyzing low-level standards and evaluating signal reproducibility.

Benefits and practical applications

These guidelines facilitate seamless migration of established CAD methods to modern detectors, preserving quantitation consistency while leveraging enhanced sensitivity. Tailored Evap T, PFV and filter settings allow analysts to optimize for specific analyte volatility and concentration ranges, improving QA/QC workflows in regulated industries.

Future trends and potential applications

Advancements may include automated method optimization algorithms, expanded integration with high-throughput LC systems and broader use in non-targeted analysis fields such as lipidomics and metabolomics. Continued detector improvements will further strengthen low-level detection and linearity.

Conclusion

By adopting the recommended starting conditions and systematic optimization strategies for evaporation temperature, power function value and filter settings, laboratories can effectively transition methods from legacy Corona detectors to Corona Veo and Vanquish CAD platforms, achieving reliable, high-sensitivity analyses.