Multi-mycotoxin analysis in complex biological matrices using LC-ESI/MS: experimental study using triple stage
Diran Herebian1, Sebastian Zühlke, Marc Lamshöft
1Institute of Environmental Research, University of Dortmund, Dortmund, Germany.
Journal of Separation Science
|February 19, 2009
Summary
This study compares two liquid chromatography-mass spectrometry (LC-MS) systems for mycotoxin analysis in grains. The triple quadrupole LC-MS/MS method proved reliable for quantifying 32 mycotoxins, showing stability against matrix effects.
Area of Science:
- Analytical Chemistry
- Food Safety
- Mass Spectrometry
Background:
- Mycotoxin contamination in food commodities like wheat and maize poses a significant risk to human and animal health.
- Accurate and sensitive analytical methods are crucial for detecting and quantifying these harmful compounds.
- Existing methods may face challenges with sensitivity, specificity, or matrix effects in complex samples.
Purpose of the Study:
- To apply and compare two distinct LC-MS systems for comprehensive mycotoxin analysis.
- To develop and validate a sensitive HPLC-ESI-MS/MS method for 32 mycotoxins in crude grain extracts.
- To evaluate an alternative method using micro-LC-LTQ-Orbitrap for rapid quantitative analysis.
Main Methods:
- Extraction of mycotoxins using an acetonitrile/water/acetic acid mixture followed by direct injection.
- Development of a High-Performance Liquid Chromatography-Electrospray Ionization-Tandem Mass Spectrometry (HPLC-ESI-MS/MS) method on a TSQ Quantum Ultra AM system.
- Validation of the HPLC-ESI-MS/MS method for linearity, recovery, matrix effect, precision, and sensitivity.
- Development and evaluation of a micro-LC-LTQ-Orbitrap method utilizing accurate mass measurements in full scan mode.
Main Results:
- The HPLC-ESI-MS/MS method demonstrated high sensitivity, reliability, and stability in quantitation, effectively managing matrix effects in grain samples.
- Both LC-MS systems showed excellent sensitivity and repeatability in positive ionization mode.
- The micro-LC-LTQ-Orbitrap method was found unsuitable for negatively ionizable compounds.
- The triple quadrupole method successfully quantified 32 mycotoxins in wheat and maize extracts without dilution.
Conclusions:
- The validated HPLC-ESI-MS/MS method is a robust and sensitive tool for routine mycotoxin analysis in cereal grains.
- The triple quadrupole mass spectrometer offers stable quantitation and resilience to matrix effects, making it suitable for food safety applications.
- While Orbitrap technology shows promise, its applicability for negatively ionizable mycotoxins requires further investigation.
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