Analysis of T-2 and HT-2 toxins in cereal grains by immunoaffinity clean-up and liquid chromatography with fluorescence detection.
A sensitive, precise and accurate method has been developed for the simultaneous determination of T-2 and HT-2 toxins in cereal grains at ppb levels using high-performance liquid chromatography (HPLC) with fluorescence detection and 1-antroylnitrile (1-AN) as labeling reagent after immunoaffinity clean-up. Cereal samples were extracted with methanol/water (90:10, v/v), and the extracts were cleaned-up through commercially available immunoaffinity columns containing monoclonal anti-T-2 antibodies (T-2 test HPLC, Vicam). T-2 and HT-2 toxins were quantified by reversed-phase HPLC with fluorometric detection (excitation wavelength 381 nm, emission wavelength 470 nm) after derivatization with 1-AN. The monoclonal antibody showed 100% cross-reactivity with both T-2 and HT-2 toxin, and the immunoaffinity column clean-up was effective up to 1.4 microg of both toxins. The method was successfully applied to the analysis of T-2 and HT-2 toxins in wheat, maize and barley. Recoveries from spiked samples with toxin levels from 25 to 500 microg/kg ranged from 70% to 100%, with relative standard deviation generally lower than 8%. The limit of detection of the method was 5 microg/kg for T-2 toxin and 3 microg/kg for HT-2 toxin, based on a signal-to-noise ratio 3:1. HT-2 toxin was detected in ten naturally contaminated wheat samples out of 14 samples analyzed, with toxin levels ranging from 10 to 71 microg/kg; three of them contained also T-2 toxin up to 12 microg/kg.
Institute of Sciences of Food Production, National Research Council, Via G. Amendola 122/O, 70126 Bari, Italy. angelo.visconti@ispa.cnr.it
Angelo
A
Visconti
Veronica Maria Teresa
VM
Lattanzio
Michelangelo
M
Pascale
Miriam
M
Haidukowski
D000911:Antibodies, Monoclonal / Q000276:immunology; D002846:Chromatography, Affinity / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003429:Cross Reactions; D002523:Edible Grain / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013605:T-2 Toxin / Q000031:analogs & derivatives* / Q000032:analysis* / Q000276:immunology
D000911:Antibodies, Monoclonal; D013605:T-2 Toxin; C012351:HT-2 toxin