Fumonisins B1, B2 and B3 in corn products,wheat flour and corn oil marketed in Shandong province of China

In this study a total of 522 samples were collected from Shandong province of China in 2014 and analysed for the occurrence of fumonisin B1 (FB₁), FB₂ and FB₃ by isotope dilution ultrahigh performance liquid chromatography–tandem mass spectrometry. Fumonisins were detected in 98.1% of the corn products, with the average total level of 369.2 μg kg^?1. The individual average values of FB₁, FB₂ and FB₃ in corn products were 268.3, 53.7 and 47.2 μg kg^?1, respectively. The simultaneous occurrence of FB₁, FB₂ and FB₃ was observed in 76.7% of the corn products. Especially, the results demonstrated that the difference in the contamination levels for fumonisins in these three types of corn products was apparent. In addition, 6.2% of the wheat flour samples were contaminated with FB₁, with concentrations ranging from 0.3 to 34.6 µg kg^?1. No FB₂ or FB₃ was detected in wheat flour. In corn oil samples no fumonisins were detected.