关键词: 小麦, 呕吐毒素, 臭氧, 动力学, 降解产物

Abstract:

In this study, we used ozone to reduce deoxynivalenol (DON) in contaminated wheat, and the ozonation
products were deduced using ultra performance liquid chromatography quadrupole time-of-flight mass spectrometry
(UPLC Q-TOF MS). The results showed that DON content in whole wheat flour decreased more quickly than in wheat kernels.
For wheat with a moisture content of 20.10%, DON content was reduced from 3.89 mg/kg to 0.83 mg/kg after 100 mg/L
ozone treatment for 60 min. The kinetic model constants with different ozone concentrations showed the decreasing order of
k100 mg/L＞k75 mg/L＞k50 mg/L＞k25 mg/L, which was consistent with the experimental results. According to the mass spectral and ion
fragmentation information from UPLC Q-TOF, possible ozonation products were proposed. The m/z of the major products
were 344.948 1, 329.205 0, 311.191 8, 311.190 7 and 346.240 4, respectively.

Key words: deoxynivalenol, ozone, kinetic, degradation products