Abstract
The present study indicated that complex nutrients enhanced bioaccumulation of cadmium by Aspergillus niger AB 10 . Amongst them, commercial yeast extract showed most prominent effect. Highly significant increment of cadmium accumulation of about 31.2% was observed from a chemically defined medium containing 4 μg/ml of cadmium when the culture medium was supplemented with yeast extract at a concentration of 7.5 mg/ml. Specific composition of a complex nutrient was also found to influence cadmium accumulation. A commercial peptone preparation enriched with tryptophan showed 19.4% increase in bioaccumulation of cadmium, in comparison to peptone without any fortification of tryptophan (9.4% increase). Tryptophan, when supplemented separately in the culture medium, was found to 6.7% increase in cadmium accumulation. The amino acid arginine (8.03% increase) and water-soluble vitamins like ascorbic acid (11.34% increase) and pyridoxine (13.43% increase) were also found to stimulate cadmium uptake in similar cultural conditions.
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