Calcination enhances the aflatoxin and zearalenone binding efficiency of a Tunisian clay
| Autor: | Mario Van de Velde, Roua Rejeb, Christel Detavernier, Achraf Ghorbal, Richard Ducatelle, Madiha Hadj Ayed, Gunther Antonissen, Sarah De Saeger, Marthe De Boevre |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
ZERO CHARGE
Hot Temperature ADSORPTION ph Health Toxicology and Mutagenesis lcsh:Medicine 020101 civil engineering 02 engineering and technology purified 010501 environmental sciences Toxicology 01 natural sciences 0201 civil engineering law.invention law Cation-exchange capacity Point of zero charge Chemistry pH food and beverages BINDERS Ion Exchange Bentonite Illite ANIMAL FEED MODIFIED MONTMORILLONITE Clay minerals inorganic chemicals CATION-EXCHANGE CAPACITY aflatoxins MYCOTOXIN engineering.material complex mixtures Article Adsorption calcined Specific surface area Calcination Veterinary Sciences LEAD REMOVAL 0105 earth and related environmental sciences lcsh:R zearalenone IN-VITRO MASS-SPECTROMETRY clay BENTONITE Gastrointestinal Tract adsorption engineering Nuclear chemistry |
| Zdroj: | TOXINS Toxins, Vol 11, Iss 10, p 602 (2019) Toxins Volume 11 Issue 10 |
| ISSN: | 2072-6651 |
| Popis: | Clays are known to have promising adsorbing characteristics, and are used as feed additives to overcome the negative effects of mycotoxicosis in livestock farming. Modification of clay minerals by heat treatment, also called calcination, can alter their adsorption characteristics. Little information, however, is available on the effect of calcination with respect to mycotoxin binding. The purpose of this study was to characterize a Tunisian clay before and after calcination (at 550 ° C), and to investigate the effectiveness of the thermal treatment of this clay on its aflatoxin B1 (AFB1), G1 (AFG1), B2 (AFB2), G2 (AFG2), and zearalenone (ZEN) adsorption capacity. Firstly, the purified clay (CP) and calcined clay (CC) were characterized with X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR-IR), cation exchange capacity (CEC), specific surface area (SBET), and point of zero charge (pHPZC) measurements. Secondly, an in vitro model that simulated the pH conditions of the monogastric gastrointestinal tract was used to evaluate the binding efficiency of the tested clays when artificially mixed with aflatoxins and zearalenone. The tested clay consisted mainly of smectite and illite. Purified and calcined clay had similar chemical compositions. After heat treatment, however, some changes in the mineralogical and textural properties were observed. The calcination decreased the cation exchange capacity and the specific surface, whereas the pore size was increased. Both purified and calcined clay had a binding efficacy of over 90% for AFB1 under simulated poultry GI tract conditions. Heat treatment of the clay increased the adsorption of AFB2, AFG1, and AFG2 related to the increase in pore size of the clay by the calcination process. ZEN adsorption also increased by calcination, albeit to a more stable level at pH 3 rather than at pH 7. In conclusion, calcination of clay minerals enhanced the adsorption of aflatoxins and mostly of AFG1 and AFG2 at neutral pH of the gastrointestinal tract, and thus are associated with protection against the toxic effects of aflatoxins. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|