Abstract
Aflatoxin B1 adsorption by the concentrate of bentonite clay - montmorillonite and the natural zeolite - clinoptilolite and was investigated at the initial toxin concentration 4 ppm, with different amonunts of solid phase in suspension (10, 5, 2 and 1 mg/10 mL) and different pH values - 3, 7 and 9. Results indicated that for both minerals, decreasing the amount of solid phase in suspension, decrease the amount of active sites relevant for adsorption of aflatoxin B1. Thus, for concentrate of montnorillonite, at the lowest level of solid phase in suspension (1 mg/10 mL), aflatoxin B1 adsorption indexes were 97% at pH 3, 88% at pH 7 and 82% at pH 9, while for the natural zeolite, adsorption of toxin was 9% at pH 3 and 7% at pH 7 and 9. Since inorganic cations in minerals are mainly responsible for aflatoxin B1 adsorption, even the natural zeolite - clinoptilite has much higher cation exchange capacity (the content of inorganic exchangeable cations) compared to the concentrate of montmorillonite, adsorption of aflatoxin B1 by this mineral is much lower. Comparing the molecular dimensions of aflatoxin B1 molecule with the dimension of channels of clinoptilolite and interlamellar space of montmorillonite it is obvious that this toxin is adsorbed only at the external surface of clinoptilolite while in the montmorillonite all active sites are equally available for its adsorption. Thus, the concentrate of montmorillonite posess by higher adsorption capacity for aflatoxin B1. Results presented in this paper confirmed the fact the differences in the structure of minerals led to their different efficiency for adsorption of aflatoxin B1. Mineralogical and chemical composition, determination of cation exchange capacity, etc., are very important parameters influencing the effectiveness of minerals as aflatoxin B1 adsorbents. [Projekat Ministarstva nauke Republike Srbije, br. 451-03-2802-IP Tip1/142, br. 172018 i br. 34013] <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/HEMIND170208003E">10.2298/HEMIND170208003E</a><u></b></font>
Highlights
Since inorganic cations in minerals are mainly responsible for aflatoxin B1 adsorption
interlamellar space of montmorillonite it is obvious that this toxin is adsorbed
while in the montmorillonite all active sites are equally available for its adsorption
Summary
Mikotoksini su sekundarni metaboliti pojedinih vrsta plesni i obično se nalaze na zrnastim hranivima. Mikotoksini, najčešće prisutni u stočnoj hrani su: aflatoksini, ohratoksini, zearalenon, trihoteceni i fumonizini. Najekonomičniji pristup u sprečavanju dejstva mikotoksina, odnosno detoksikaciji hrane zagađene mikotoksinima, je baziran na osvajanju novih efikasnih mineralnih adsorbenata koji se dodaju kao aditivi stočnoj hrani u određenoj koncentraciji. Bentonitske gline su prirodne mineralne sirovine često mogu da sadrže nepoželjne prateće minerale, često su promenljivog hemijskog i mineraloškog sastava i osobina. Ispitivanje adsorpcije aflatoksina B1 na dvadeset smektitskih glina je pokazalo da samo tri proizvoda imaju visok kapacitet adsorpcije kao – NovaSilTM [14]. Kao prirodne nemetalične sirovine su veoma često promenljivog mineraloškog i hemijskog sastava. Rezultati su upoređeni da rezultatima adsorpcije aflatoksina B1 na prirodnom zeolitu, kod kojeg je dominantan mineral klinoptilolit
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