Copper, cobalt and cadmium binded by Debaryomyces occidentalis cell wall polymers
DOI:
https://doi.org/10.33885/sf.2004.3.925Keywords:
Debaryomyces occidentalis, ion biosorption, bioremediation, cell wall components, heavy metalsAbstract
study was made of Debaryomyces occidentalis cell wall polymers involved in the
biosorption of cadmium, copper and cobalt in order to evaluate the environmental yeasts
ability to detoxify polluted habitats. The cell wall components accumulated more heavy
metals than the intact cell wall, indicating that many binding sites were exposed during the
extraction procedures. The decreasing order of the metal chelating was copper, cadmium
and cobalt, except in the mannan samples where more cobalt than cadmium was fixed. The
metal accumulation by enzymatically modified yeast showed a significant correlation with
the protein:carbohydrate ratio and the yield of cell wall material remained after enzymatic
degradation. A 15% increase in metal fixing after mannan digestion suggested that additional
metal binding sites were exposed on the proteins of the mannan-protein fraction. In
conclusion, it was observed that the cell wall components binded the metals in the order:
protein>mannose>chitin> glucan
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