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Updated: Jul 7, 2026

Whole-cell MALDI-TOF Mass Spectrometry is an Accurate and Rapid Method to Analyze Different Modes of Macrophage Activation
Published on: December 26, 2013
MALDI-TOF mass spectrometry compatible inactivation method for highly pathogenic microbial cells and spores
Peter Lasch1, Herbert Nattermann, Marcel Erhard
1P25, ZBS2, and ZBS4, Robert Koch-Institut, Nordufer 20, 13353 Berlin, Germany. LaschP@rki.de
A new trifluoroacetic acid (TFA) inactivation method effectively inactivates vegetative cells and spores of high-risk microorganisms. This rapid protocol is compatible with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry for microbial identification.
Area of Science:
- Microbiology
- Analytical Chemistry
- Biotechnology
Background:
- Intact cell mass spectrometry (ICMS) is an emerging technology for microbial identification.
- Current methods lack matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) compatible inactivation for high-risk organisms, hindering ICMS development.
- Bacterial endospores and biosafety level (BSL) 3 microorganisms require specific inactivation strategies.
Purpose of the Study:
- To develop a rapid and effective microbial inactivation method compatible with MALDI-TOF mass spectrometry.
- To ensure microbial inactivation while preserving protein patterns for accurate analysis.
- To enable the identification of BSL-3 microorganisms using ICMS.
Main Methods:
- Evaluation of various physical, chemical, and mechanical inactivation procedures.
- Optimization of trifluoroacetic acid (TFA) treatment for vegetative cells and spores.
- Development of a combined TFA inactivation protocol including centrifugation and filtering for spores.
- Assessment of bactericidal capacity and spectral information content.
Main Results:
- 80% trifluoroacetic acid (TFA) effectively inactivated vegetative cells within 30 minutes.
- A specialized "TFA inactivation protocol" successfully inactivated bacterial endospores.
- The developed protocol is rapid (30 minutes), simple, and preserves protein profiles for MALDI-TOF/ICMS analysis.
- Reliable inactivation of both vegetative cells and spores of BSL-3 microorganisms was achieved.
Conclusions:
- Trifluoroacetic acid (TFA) treatment provides an effective inactivation method for MALDI-TOF/ICMS.
- The "TFA inactivation protocol" enables the safe and accurate identification of BSL-3 microorganisms.
- This methodology advances the application of ICMS in clinical, food, and biosafety microbiology.
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