School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.
J Colloid Interface Sci. 2018 Feb 1;511:67-76. doi: 10.1016/j.jcis.2017.09.074. Epub 2017 Sep 25.
Organo-montmorillonites (OMts) modified with mono- and di-alkyl cationic surfactants were prepared to remove polar mycotoxin aflatoxin B (AFB) and weak polar, hydrophobic mycotoxin zearalenone (ZER) simultaneously. The structural and surface properties of the prepared OMts were investigated. In vitro adsorption experiments were carried out to simulate the in vivo conditions of gastrointestinal tract of animals by a batch mode. The adsorption of AFB and ZER in both single and binary-contaminate systems were investigated systematically. Both OMts showed super enhanced adsorption capacities towards AFB and ZER whenever in single and binary-contaminate systems compared with raw Mt, indicating the effectiveness of the prepared OMts acted as mycotoxins adsorbents. DODAC-Mt showed a higher adsorption capacity towards AFB and ZER than OTAB-Mt. The equilibrium data of AFB on OMts were fitted satisfactorily with Freundlich and Linear models, suggesting the co-existence of different adsorption mechanism which were proposed to be ion-dipole interactions (between surfactant cations and carbonyl groups of AFB) and adsorption/partition mechanisms. The adsorption isotherms of OMts to ZER matched best with Linear models, implying the adsorption/partition mechanism. For simultaneous adsorption, the adsorption process of one mycotoxin was slightly affected by the presence of the other mycotoxin due to the requirement of partial same sorption sites. In addition, the solution pH had negligible influence on the adsorption process of OMts, meaning no desorption occurred when the adsorbents pass through from stomach to intestine as animal feed.
用单烷基和双烷基阳离子表面活性剂修饰的有机蒙脱土（OMts）被制备出来，以同时去除极性真菌毒素黄曲霉毒素 B（AFB）和弱极性、疏水性真菌毒素玉米赤霉烯酮（ZER）。研究了制备的 OMts 的结构和表面性质。通过分批模式进行了体外吸附实验，以模拟动物胃肠道的体内条件。系统研究了在单污染和双污染体系中 AFB 和 ZER 的吸附情况。与原始 Mt 相比，无论在单污染和双污染体系中，OMts 对 AFB 和 ZER 都表现出超强的吸附能力，这表明制备的 OMts 作为真菌毒素吸附剂是有效的。DODAC-Mt 对 AFB 和 ZER 的吸附容量均高于 OTAB-Mt。AFB 在 OMts 上的平衡数据分别很好地符合 Freundlich 和线性模型，表明存在不同的吸附机制，这些机制被提出为离子偶极相互作用（表面活性剂阳离子与 AFB 的羰基之间）和吸附/分配机制。OMts 对 ZER 的吸附等温线与线性模型拟合最佳，表明吸附/分配机制。对于同时吸附，由于需要部分相同的吸附位点，一种真菌毒素的吸附过程会受到另一种真菌毒素的存在的轻微影响。此外，溶液 pH 值对 OMts 的吸附过程几乎没有影响，这意味着当吸附剂从胃传递到肠道作为动物饲料时，不会发生解吸。
