辐照降解溶液及粮谷中的脱氧雪腐镰刀菌烯醇

Degradation of Deoxynivalenol in Solutions and Grains by Irradiation

为研究脱氧雪腐镰刀菌烯醇(DON)在不同介质中经γ射线辐照的降解效果,以DON标准品水溶液、乙酸乙酯溶液及粮谷中自然污染的DON为对象,研究了经剂量为3~9kGy的辐照处理后DON浓度的变化,并对降解产物进行初步分析。结果表明,辐照处理可有效降低水溶液、乙酸乙酯溶液中DON标准品及大米中DON的含量。相同条件下,水溶液中DON的降解效果优于乙酸乙酯,9 kGy时,800μg·m L^(-1)的乙酸乙酯溶液中DON的降解率为27.5%,而水溶液中达到73.1%;散装大米中DON污染量为112.5μg·kg^(-1),9 kGy时降解率接近90%。m/z为373的物质可能是DON的辐照降解产物,其图谱表明,该物质在水溶液中有3个同分异构体。本研究结果为进一步深入探究DON的辐照降解产物及降解机理提供了参考。

In order to study the degradation of deoxynivalenol （DON） in different medium exposed to γ ray, DON standard in aqueous solution, ethyl acetate solution concentrations of DON after irradiation at 3 to 9kGy, that, contents of DON standard in aqueous, ethyl and naturally DON in contaminated grains were used to detect meanwhile, radiolytic products were analyzed. The results show acetate solutions and naturally DON in contaminated rice were effectively reduced after irradiation treatment. In the same conditions, DON in the aqueous solution were better degraded than in ethyl acetate, when irradiation with 9kGy, the degradation rate of 800μg·m L^-1 DON in ethyl acetate is 27.5% , but it is 73.1% in aqueous solution. The degradation rate of DON in rice what contaminated DON amount is 112.5μg·kg^-1 closes to 90%. The product with molecular weight （m/z） of 373.5 may be one radiolytic product of DON. The chromatograms of products with m/z of 373.5 in the aqueous solution exhibited 3 isomers. This study provided reference to further study about radiolytic products of DON and the mechanism of degradation.