碱法制备米蛋白过程中微波辅助降解黄曲霉毒素B1的研究
Study on degradation of aflatoxin B1 during the preparation of rice protein by microwave-assisted alkali treatment
-
摘要: 针对稻米中所存在的黄曲霉毒素污染的问题,本文研究了碱法制备米蛋白过程中微波辅助处理对黄曲霉毒素B1(AFB1)降解率的影响。结果表明,碱法制备米蛋白工艺可使AFB1浓度下降46.83%,米蛋白中AFB1残留浓度为33.91μg/kg,不符合国家标准(≤10μg/kg);基于该工艺研究,单位体积微波功率750W/L和微波处理时间7min为微波辅助碱法降解AFB1的最佳处理条件,AFB1降解率为88.51%,米蛋白中AFB1残留浓度为7.33μg/kg,符合国家标准。同时,AFB1初始浓度对微波辅助碱法降解AFB1的影响不显著,通过对微波辅助碱法降解AFB1工艺进行动力学模型拟合,表明该降解特征符合一级动力学模型。Abstract: 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.
下载: