Reliable identification and quantification of trichothecenes and other mycotoxins by electron impact and chemical ionization-gas chromatography-mass spectrometry, using an ion-trap system in the multiple mass spectrometry mode. Candidate reference method for complex matrices.
Highly toxic mycotoxins like the trichothecenes can be found as contaminants from the metabolism of fungi in food and food preparations. They can be identified and quantified with great accuracy by GC/MS-measurements. Reliable analytical methods are urgently needed because such mycotoxins are not only toxic substances occurring in nature but also are in the list of biological weapons (e.g. T2-toxin, HT-2-toxin) and have some potential for terroristic attacks. By using GC/MS in the EI- and NCI- or PCI-mode and MS(n)-measurements with a 30 m Rtx 5MS fused-silica capillary column it is possible to identify and quantify all relevant mycotoxins either as underivatized substances or as their TMS-derivatives in extracts from food, food preparations or beverages with very complex matrix-derived background. This method can also be used to determine free ricinine as a biological marker for ricine in terroristic attacks. So laborious and time-consuming steps of sample-preparation can often be diminished. The LOD is in the range of 10-50 pg and the LOQ with linear calibration curves is in the range of 50-5000 pg. The high specificity of these methods helps not only to detect the existence of intentional terroristic or natural food contamination but also to avoid faulty alarm with unnecessary panic in the public. Furthermore, these methods have a high potential in ameliorating the safety of basic food and food products.
Melchert
H U
HU
Robert Koch-Institute, RKI 22, Bereich Tempelhof General-Pape-Strasse 62-66, D-12101 Berlin, Germany. melcherth@rki.de
Pabel
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D002138:Calibration; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D009183:Mycotoxins / Q000032:analysis*; D012015:Reference Standards; D012680:Sensitivity and Specificity; D014255:Trichothecenes / Q000032:analysis*
D009183:Mycotoxins; D014255:Trichothecenes