Determination of zearalenone in corn by means of immunoaffinity clean-up and high-performance liquid chromatography with fluorescence detection.
A rapid and accurate method to quantify zearalenone in corn is described. The method uses immunoaffinity chromatography for purification and high-performance liquid chromatography (HPLC) for detection and quantification of the toxin. Corn samples were extracted with acetonitrile-water (90:10, v/v) and the extract was diluted with water (1:10, v/v) and applied to a Vicam ZearalaTest immunoaffinity column. The column was washed with water and zearalenone was eluted with methanol and quantified by reversed-phase HPLC with fluorometric detection (lambda ex = 274 nm, lambda em = 440 nm) using acetonitrile-water-methanol (46:46:8, v/v) as mobile phase. Zearalenone recoveries from the ZearalaTest column were higher than 95%, and the column can hold a maximum of 4.0 micrograms of toxin. Average recoveries of zearalenone from corn spiked at levels of 0.1-10 micrograms/g ranged from 9 to 99.5%, with relative standard deviations of < 6%. The detection limit was 3 ng/g based on a signal-to-noise ratio of 3:1. Comparative analysis of 14 naturally contaminated samples using this method and the AOAC official method 985.18 showed a reasonable correlation (r = 0.87). Advantages of the immunoaffinity method as compared to the AOAC method are discussed.
Istituto Tossine e Micotossine da Parassiti Vegetali, C.N.R., Bari, Italy.
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D002846:Chromatography, Affinity; D002851:Chromatography, High Pressure Liquid; D009183:Mycotoxins / Q000032:analysis*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D003313:Zea mays / Q000737:chemistry*; D015025:Zearalenone / Q000032:analysis*
D009183:Mycotoxins; D015025:Zearalenone