Safety and efficacy of NovaSil clay as a dietary supplement to prevent aflatoxicosis [electronic resource] /

by Afriyie-Gyawu, Evans

Abstract (Summary)
It is well documented that aflatoxin contamination in foods presents significant economic and public health burdens worldwide. Aflatoxins, particularly aflatoxin B? (AFB?), have been implicated in the etiology of disease and death in many parts of the world, necessitating research initiatives for intervention strategies designed to diminish biological exposure. Calcium montmorillonite clays (e.g. NovaSil Plus, NSP) have been found to tightly bind and inactivate aflatoxins in the gastrointestinal tract of multiple animal species. In the future, the hypothesis is that this strategy may also be appropriate for humans. Thus, the overall research goal was to investigate NSP suitability for human use through in vitro characterization followed by in vivo evaluation of NSP-AFB? sorption and most importantly, safety of the clay.The first objective was to characterize the in vitro and in vivo sorption efficiency of NSP-AFB? sorption and determine potential interactions with vitamin A (VA). Isothermal analysis suggested that NSP binds AFB? with high capacity, affinity, and specificity in aqueous solution and further indicated that NSP does not appear to interact with VA. Subsequent short-term studies in Sprague-Dawley (S-D) rats and broiler chicks indicated that dietary inclusion of NSP (0.25%) significantly reduced AFB? bioavailability without exerting overt toxicity. The second objective was to evaluate potential adverse effects of chronic ingestion of dietary NSP using male and female S-D rats in the absence of aflatoxins. Although statistically significant changes to a few parameters were noted, the differences did not appear to be NSP- or dose-dependent, suggesting that NSP at dietary inclusion levels as great as 2.0% (w/w) does not produce overt toxicity. Thus, this information increases the feasibility for using NSP in human trials in populations at high risk for aflatoxicosis. The third objective was to establish representative baseline data on human exposure to aflatoxins by collecting and quantifying urinary AFM? in volunteers living in four separate communities in Ejura district of Ghana. Results revealed that urinary AFM? in the study population was substantially high (mean= 1,850.86 ± 274.59 pg/mg creatinine), indicating that this particular population was highly exposed to aflatoxins and could be used for future intervention trials.
Bibliographical Information:


School:Texas A&M International University

School Location:USA - Texas

Source Type:Master's Thesis

Keywords:major toxicology prevention aflatoxins novasil clay


Date of Publication:

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