Sensitive multi-mycotoxins analysis with a single sample preparation by LC-MS/MS

Importance of the Topic

This work addresses the critical need for reliable detection of multiple mycotoxins in food using a single preparation workflow coupled with LC MS MS. Mycotoxins such as aflatoxins and trichothecenes pose serious health risks including liver cancer and nephritis. A unified assay enhances compliance with diverse regulatory limits worldwide and strengthens food safety controls.

Objectives and Study Overview

The main goal was to develop a streamlined one step sample cleanup and a single LC MS MS analysis capable of quantifying nineteen mycotoxins in wheat matrix at low nanogram per milliliter levels. Emphasis was placed on minimizing carryover and accommodating both positive and negative ionization modes.

Methodology

• Extraction of fifty gram wheat flour with water acetonitrile and filtration through sub point seven micrometer glass fiber paper
• Spin column purification using an acidified extract followed by centrifugation at ten thousand rpm
• LC separation on a pentafluorophenyl phase column with a gradient of ammonium acetate and acetic acid in methanol
• ESI LC MS MS detection in MRM mode for both positive and negative polarities

Used Instrumentation

• Nexera X2 UHPLC system with Mastro PFP2 column two point one by one fifty millimeter three micrometer
• Triple quadrupole mass spectrometer LCMS 8060 with electrospray ionization
• Metal free sample loop and multi rinse autosampler to reduce carryover

Main Results and Discussion

The method achieved clear chromatographic separation of all nineteen mycotoxins within fifteen minutes without polarity specific runs. Typical MS chromatograms at fifty parts per billion showed distinct peaks. Matrix effect studies revealed significant signal suppression for nivalenol deoxynivalenol aflatoxin B1 T two toxin and zearalenone. Recovery rates ranged from below fifty percent up to one hundred sixty six percent indicating variable extraction efficiency. Metal free fluidics and a three step rinse program effectively controlled carryover. The use of isotopically labeled internal standards is recommended to correct for matrix induced signal variation.

Benefits and Practical Applications

• Single step cleanup saves time and reduces handling errors
• A single LC MS MS run covers multiple regulated mycotoxins across international standards
• High sensitivity supports detection at regulatory thresholds
• Reduced carryover enhances throughput and method robustness

Future Trends and Potential Applications

Integration of stable isotope dilution will improve quantitative accuracy. High resolution mass spectrometry may extend analyte coverage. Automated sample preparation and cloud based data processing could further streamline mycotoxin monitoring in quality control and research laboratories.

Conclusion

A rapid LC MS MS method with a single spin column step has been validated for nineteen mycotoxins in wheat. While matrix effects affect some analytes the inclusion of internal standards enables precise quantitation. This approach supports efficient food safety surveillance and regulatory compliance.

References

• Masayoshi Tamura Keiko Matsumoto Jun Watanabe Naoki Mochizuki et al Journal of Separation Science two thousand fourteen volume thirty seven pages fifteen fifty two to fifteen sixty