Adsorpcija aflatoksina B1 na prirodnim alumosilikatima – koncentratu montmorilonita i zeolitu / Aflatoxin B1 adsorption by the natural aluminosilicates - concentrate of montmorillonite and zeolite
2016
Marković, Marija A. (nstitut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Srbija)) | Daković, Aleksandra S. (Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Srbija)) | Rottinghaus, George E. (College of Veterinary Medicine, Columbia-MO (USA). Veterinary Medical Diagnostic Laboratory) | Stojanović, Mirjana D. (Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Srbija)) | Dondur, Vera T. (Fakultet za fizičku hemiju, Beograd (Srbija)) | Kragović, Milan M. (Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Srbija)) | Gulišija, Zvonko P. (Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Srbija))
Aflatoxin B 1 adsorption by the concentrate of bentonite clay – montmorillonite and the natural zeolite – clinoptilolite and was investigated at the initial toxin concentration of 4 ppm, with different amounts of solid phase in suspension (1, 0.5, 0.2 and 0.1 g/L) and different pH values – 3, 7 and 9. Results indicated that for both minerals, decreasing the amount of solid phase in suspension, decrease the amount of active sites relevant for adsorption of aflatoxin B 1 . Thus, for concentrate of montnorillonite, at the lowest level of solid phase in suspension (0.1 g/L), aflatoxin B 1 adsorption indexes were 97% at pH 3, 88% at pH 7 and 82% at pH 9, while for the natural zeolite, adsorption of toxin was 9% at pH 3 and 7% at pH 7 and 9. Since inorganic cations in minerals are mainly responsible for aflatoxin B1 adsorption, even the natural zeolite – clinoptilite has much higher cation exchange capacity (the content of inorganic exchangeable cations) compared to the concentrate of montmorillonite, adsorption of aflatoxin B1 by this mineral is much lower. Comparing the molecular dimensions of aflatoxin B1 molecule with the dimension of channels of clinoptilolite and interlamellar space of montmorillonite it is obvious that this toxin is adsorbed only at the external surface of clinoptilolite while in the montmorillonite all active sites are equally available for its adsorption. Thus, the concentrate of montmorillonite possesses higher adsorption capacity for aflatoxin B1. Results presented in this paper confirmed the fact that the differences in the structure of minerals led to their different efficiency for adsorption of aflatoxin B 1 . Mineralogical and chemical composition, determination of cation exchange capacity, etc., are very important parameters influencing the effectiveness of minerals as aflatoxin B 1 adsorbents.
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