The effects of radiation duration, plasma transmit power, aflatoxins B1 initial concentration on the degradation rate of aflatoxins B1 dissolved in acetonitrile by low temperature radio frequency plasma were studied in this paper. Meanwhile, the possible degradation pathway and degradation products were analyzed by HPLC -MS/MS The results indicated that the aflatoxins B1 degradation rate was increased with elevated transmit power and reduced initial aflatoxins B1 concentration. When 200 ～ 500 μg/L aflatoxins B1 was exposed to 120 W plasma for more than 150 s, the degradation rate of aflatoxins B1 reached more than 95%. HPLC - MS/MS analysis of the degradation mixture revealed three major quasi - molecular peaks of 157,299, and 339 respectively after comparing first mass information of aflatoxins Bt through different plasma treatment time. The three peaks were proposed corresponding to the degradation products of aflatoxins B1. The degradation products and the pathway were identified using secondary mass fragments information and active site in the structure of aflatoxins B1.
Journal of the Chinese Cereals and Oils Association
low temperature radio frequency plasma, aflatoxins B1, degradation rate, degradation product