Equilibrium modeling of selenium binding from aqueous solutions by Candida utilis ATCC 9950 yeasts

3 Biotech
Marek KieliszekKatarzyna Brzezicka

Abstract

The study investigated the effectiveness of selenium binding from its salt solution by Candida utilis ATCC 9950 yeast biomass cultured on a medium prepared from the agro-food industry wastes, containing an available source of carbon and nitrogen. Selenium binding by C. utilis yeast strain after 48 h of culturing at 28 °C from aqueous solutions with the addition of 30 mg Se/L reached a value of 2.28 mg Se/g of yeast biomass. The kinetics of selenium binding by the yeasts showed a better fit for the pseudo-second-order kinetic model compared to the pseudo-first-order one. Accumulation stability data were analyzed using the Freundlich and Langmuir isotherm models. The presence of competing anions such as SO 4 2 - , and HPO 4 2 - at a concentration of 0.5 mM resulted in about 35% reduction of selenium binding by the examined C. utilis strain. FTIR analysis showed that sulfur compounds were involved in selenium biosorption by the yeast. Compounds containing ammonium groups appeared to be very important for selenium binding. The results of the study demonstrated that the yeast can be used to effectively bind selenium from aqueous solution. At the same time, it gives the opportunity to obtain a biomass rich in this def...Continue Reading

References

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Citations

Apr 17, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Marek Kieliszek
Jul 8, 2020·Biological Trace Element Research·Marek Kieliszek, Marianna Dourou
Feb 9, 2019·Molecular Biology Reports·Marek KieliszekAnna M Kot
Jul 20, 2021·Critical Reviews in Food Science and Nutrition·Jingpeng Yang, Hong Yang

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Methods Mentioned

BETA
infrared spectroscopy
scanning electron microscopy

Software Mentioned

SigmaPlot
Statistica
Statgraphics Centurion XVII

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