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Thirty-three samples of wheat of the 1982 crop year from Kansas and Nebraska were analyzed for deoxynivalenol, T-2 toxin, zearalenone, and aflatoxin. Deoxynivalenol was identified in 31 of 33 samples, zearalenone was identified in 3 of 33 samples, and aflatoxin B1 was identified in 23 of 31 samples. One 1982 wheat sample from Illinois and one from Texas were also contaminated with deoxynivalenol at 1,200 and 600 ng/g, respectively. None of the samples contained detectable T-2 toxin. The mean concentration of deoxynivalenol was 1,782 +/- 262 ng/g, and the concentrations of aflatoxin B1 ranged from 0.8 to 17.0 ng/g, with a mean of 3.37 +/- 0.7. Zearalenone concentrations of the three positive samples were 35, 90, and 115 ng/g. However, density segregation of two other samples which tested negative yielded light fractions, comprising less than 2% of the samples, contaminated at 230 and 254 ng of zearalenone per g; calculated zearalenone concentrations for these two samples were below the limit of detection of the method. The high frequency of aflatoxin B1 and deoxynivalenol in wheat from the 1982 crop is unprecedented, as is the simultaneous contamination of some samples with deoxynivalenol, zearalenone, and aflatoxin B1.

Simultaneous occurrence of deoxynivalenol, zearalenone, and aflatoxin in 1982 scabby wheat from the midwestern United States