The role of geological origin of smectites and of their physico-chemical properties on aflatoxin adsorption

Since 2013, bentonite in the form of dioctahedral smectite is an additive authorised in the EU as a substance for the reduction of the contamination of feed by aflatoxins. Several studies indicate a big difference in the effectiveness of smectites in sequestering aflatoxins. A clear correlation betw...

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Bibliographic Details
Published in:Applied clay science 2019-11, Vol.181, p.105209, Article 105209
Main Authors: D’Ascanio, Vito, Greco, Donato, Menicagli, Elena, Santovito, Elisa, Catucci, Lucia, Logrieco, Antonio F., Avantaggiato, Giuseppina
Format: Article
Language:English
Subjects:
Adsorption
Aflatoxins
Desorption
Hydrothermal bentonites
Sedimentary bentonites
Smectites
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Summary:Since 2013, bentonite in the form of dioctahedral smectite is an additive authorised in the EU as a substance for the reduction of the contamination of feed by aflatoxins. Several studies indicate a big difference in the effectiveness of smectites in sequestering aflatoxins. A clear correlation between mineralogical and physico-chemical properties of smectites and aflatoxin adsorption has not been well established. In the effort to identify the most critical mineralogical, chemical, and physical properties that affect aflatoxin adsorption by smectites, 29 samples of bentonites obtained from different sources around the world were evaluated. “As received” samples were divided into two main groups, i.e. hydrothermal (n=14) and sedimentary (n=15) bentonites depending on their geological origin. The characterization studies showed that all samples contained dioctahedral smectite as major mineral; a moderate CEC value (60-116 cmol/kg); the presence of iron; a small organic matter content; a near-neutral pH; and a fine and uniform particle size (
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2019.105209