Bonding mechanisms between aflatoxin B-1 and smectite
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Bentonites were used in aflatoxin-contaminated feeds and diets to reduce bioavailability of the mycotoxin. The objectives of this study were to test accessibility of smectite interlayer space to aflatoxin adsorption and to investigate bonding mechanisms between adsorbed aflatoxin B1 molecules and smectite. The aflatoxin-smectite complex had a basal spacing greater than 1.2nm up to 400C, which suggests interlayer aflatoxin adsorption. The in-phase carbonyl-stretching band shifted from 1736cm-1 for monovalent cation (K or Na) to 1687cm-1 for heavy-metal (Ni or Cu) complexes. At nearly 100% humidity, the cations did not distinctly affect band positions of the adsorbed aflatoxin molecules. We concluded that, under dry conditions, major bonding between adsorbed aflatoxin B1 and smectite was ion-dipole interactions and coordination between exchangeable cations and carbonyl groups. Under humid conditions, H-bonding between carbonyl groups and exchangeable-cation hydration-shell water was the dominant bonding force. 2010 Elsevier B.V.
author list (cited authors)
Deng, Y., Velazquez, A., Billes, F., & Dixon, J. B.
complete list of authors
Deng, Youjun||Velazquez, Ana Luisa Barrientos||Billes, Ferenc||Dixon, Joe B