蒙脱石改性前后对3种常见霉菌毒素的吸附效果及结构表征

本试验旨在研究蒙脱石经不同改性处理后对3种常见霉菌毒素的脱毒能力,以获得最佳的改性处理方法,并对蒙脱石改性前后结构进行表征。利用季铵盐及载金属离子对蒙脱石进行改性处理,测定改性前后对黄曲霉毒素B1(AFB1)、玉米赤霉烯酮(ZEN)和脱氧雪腐镰刀菌烯醇(DON)的吸附效果,并对蒙脱石原料及最佳改性处理后材料进行结构表征。结果表明:蒙脱石经6种改性处理后对3种霉菌毒素的吸附能力均显著增强(P<0.05),其中十八烷基三甲基氯化铵(STAC)改性处理后对AFB1、ZEN和DON吸附能力达到最大,分别为99.48%、93.62%和67.38%;结构表征结果显示,改性后蒙脱石的孔径、孔体积及比表面积均显著增加(P<0.05),红外光谱中出现STAC的特征峰,并检测到C、H和N元素。综上,利用载金属离子和季铵盐改性均能显著提高蒙脱石的脱毒能力,其中STAC改性是最佳改性方式;改性处理后蒙脱石分子结构疏松,STAC基团成功插层到蒙脱石分子结构中,更有利于加强对霉菌毒素的吸附能力。

Adsorption Capacity to Three Common Mycotoxins and Structural Characterization of Montmorillonite Before and After Modification

The purpose of this trial was to study the effect of montmorillonite modified with different methods on the detoxification to three common mycotoxins, to screen the best modification methods, and to characterize the structure of montmorillonite before and after modification. The montmorillonite was modified with quaternary ammonium salt and cation-bearing. The adsorption capacity to aflatoxin B1(AFB1), zearalenone(ZEN) and deoxynivalenol(DON) were determined.In addition, the structure characterization was carried out. The results showed that the adsorption ability of montmorillonite to three mycotoxins was significantly enhanced(P<0.05) by six modification treatments. The adsorption to AFB1, ZEN and DON reached the maximum of 99.48%, 93.62% and 67.38%, which was obtained by STAC treatment. The results of structural characterization of montmorillonite showed that the pore size, pore volume and surface area were significantly increased(P<0.05). The characteristic peaks of STAC appeared, and C, H and N elements were detected in the modified montmorillonite. The above results showed that the modification of metal ions bearing and quaternary ammonium salt can significantly improve the detoxification ability of montmorillonite. The STAC treatment is the best method of modification.The structure of montmorillonite was loose after modification, and the STAC was successfully intercalated into the molecular structure, which is more conducive to strengthening its adsorption capacity to mycotoxin.