Clays and Clay Minerals, Vol. 56, No. 5, 571–578, 2008.
Loading...
Authors
Arvide, M. G. Tenorio
Mulder, I.
Velazquez, A. L. Barrientos
Dixon, J. B.
Issue Date
2008
Type
Article
Language
Keywords
Periodicals , Geology , Aflatoxin , Adsorption Capacity , Cancer Prevention , FTIR , Smectite Clay
Alternative Title
Smectite Clay Adsorption Of Aflatoxin Vs. Octahedral Composition As Indicated By FTIR
Abstract
The fungus Aspergillus flavus Link ex Fries can infect grains andoil seeds andd evelop Aflatoxin B1 (AfB1) in the fieldor in storage. Aflatoxin contamination is a serious health hazard - it is extremely toxic andhepato carcinogenic for animals andhumans . A practical approach to solve this problem is to use smectite clay as an amendment to animal feed. The objective of this research is to investigate smectite clay-AfB1 interactions by employing Fourier transform infrared(FTIR) spectroscopy to determine how clay composition influences AfB1 adsorption by smectites. When AfB1 was present in the clay, the spectral region from 1800 to 1300 cm-1 was altered, andthe regions between 4000 and1 800 and1300 and400 cm-1 were unchangedexcept for the intensity in the broadregion near 3400 cm-1 related to the abundance of water. The 1300-400 cm-1 region is attributedonly to smectite clay properties, andit relates to the relative adsorption potential of the different smectites. Bonding between AfB1 andsmect ite clay appears to be in the furan rings. Other possible bonding is with the two oxygens in the coumarin ring of AfB1 and interlayer cations or their associated water molecules. The FTIR evidence of octahedral Fe in smectite andamorphous silica in the clays both indicate greater AfB1 adsorption potential. Other smectites with spectral absorption indicating predominantly Al in the octahedral positions adsorbed less AfB1.
Description
gsccm56510-ten.pdf - 235KB
Citation
Clays and Clay Minerals, Vol. 56, No. 5, 571–578, 2008.
Publisher
The Clay Minerals Society
License
Copyright © 2006-2018