Abstract
In this study, stability of yeast-metal complexes under simulated gastrointestinal condition, isotherm and kinetic models of absorptions, and the effects of pretreatments on biosorption has been studied. Results showed that the best biosorption of metals from aqueous solutions by Saccharomyces (S.) cerevisiae may be achieved after NaOH pretreatment for Mercury (Hg) 90.6%. While biodecontamination of Lead (Pb) 37.48%, Arsenic (As) 19.44%, and Cadmium (Cd) 39.9% by untreated yeast was better. In gastrointestinal condition Hg and Cd-yeast complexes were more stable and biosorption of Cd and Pb increased. Bonds of As and Hg-yeast complexes in digestion condition be reversible. The metals biosorption by untreated yeast followed the pseudo-second-order kinetic and The Langmuir isotherm models for all metals (As matched with Langmuir and Freundlich). In conclusion, using S. cerevisiae to limit the bioavailability of heavy metals in fermented drinking and dairy after digestion condition cannot be safe and metal-yeast bonds are reversible.
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