Study on degradation of aflatoxin B1 during the preparation of rice protein by microwave-assisted alkali treatment

Since the problem of aflatoxin contamination in rice might occur, the degradation of AFB 1 during the preparation of rice protein by the microwave-assisted alkali treatment was investigated in this study.The results showed that the concentration of AFB 1 was decreased 46.83% during the preparation of rice protein by the alkali treatment, and the residual concentration of AFB 1 was 33.91μg /kg, which did not reach the requirement of national standard (≤10μg /kg) .And based on the alkali treatment, the optimal microwave-assisted condition of degradation of AFB 1 was microwave power per unit volume 750W/L and microwave treating time 7min.Under this condition, the degradation rate of AFB 1 was 88.51%, and the residual concentration of AFB 1 was 7.33μg /kg.Furthermore, the effect of initial concentration of AFB 1 on degradation of AFB 1 by the microwave-assisted alkali treatment was not significant.And through the kinetic model fitting of degradation of AFB 1 by the microwave-assisted alkali treatment, it showed that the degradation characteristic of AFB 1 was in line with the first order dynamic model.