Smectite clay sequestration of aflatoxin B1 : Particle size and morphology
Mulder, I. (Texas A and M University. Soil and Crop Sciences Department)
Barrientos Velazquez, A. L. (Texas A and M University. Soil and Crop Sciences Department)
Tenorio Arvide, M. G. (Texas A and M University. Soil and Crop Sciences Department)
White, G. N. (Texas A and M University. Soil and Crop Sciences Department)
Dixon, Joe B. (Texas A and M University. Soil and Crop Sciences Department)

Date:	2008
Abstract:	The properties that might influence the sequestration of aflatoxin B (AfB) were examined. Laser-diffraction, particle-size analysis (LDPSA) indicated that the particle size of the smectite influences the amount of AfB adsorbed. Effective adsorbent smectites disperse well under combined sodium hexametaphosphate solution and ultrasonic agitation. Particle size explained 66% of the variability for most of the samples investigated in an 'as-received' state. One effective adsorbent smectite was especially well aggregated and required additional physical dispersion, thus raising the correlation to 73%. Transmission electron microscope (TEM) images show typical smectites and reveal the very diverse morphology of smectites in bentonites. Thin, cloud-like smectite, in TEM images, related positively to AfB-adsorption capacity. Particles that often fold and are usually ∼0. 5 μm across seem to be optimal. The selection of criteria for evaluating these smectites provides a scientific basis for their selection to obtain reliable performance. Particle size is of particular importance as outlined below, and use of LDPSA makes it possible to perform the analysis efficiently and with precision.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Adsorption ; Animal feed ; Corn ; Grain ; Liver cancer prevention ; Mycotoxin ; Toxicology
Published in:	Clays and Clay Minerals, Vol. 56, Núm. 5 (2008) , p. 558-570, ISSN 1552-8367

DOI: 10.1346/CCMN.2008.0560509

13 p, 1.6 MB  UAB restricted access

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