Heavy Metals Induced Oxidative Stress in Multi-Metal Tolerant Yeast, Candida sp. PS33 and its Capability to Uptake Heavy Metals from Wastewater
Heavy Metals Induced Oxidative Stress in Multi-Metal Tolerant Yeast, Candida sp. PS33 and its Capability to Uptake Heavy Metals from Wastewater
Sidra Ilyas1, Abdul Rehman1* and Qasim Ilyas2
ABSTRACT
Metal-resistant yeast strain, Candida sp. PS33, isolated from industrial wastewater showed tolerance to Pb (upto 35 mM), As (upto 29 mM), Cu (upto 23 mM), Cd (upto 11 mM) and Cr (upto 8 mM). Exposure to heavy metals at 0.1 mM for 2 days showed a remarkable increase in glutathione (GSH) level after As and Pb treatment in contrast to Cd, Cr and Cu exposure. GSH: GSSG ratio declined after As, Pb and Cr treatment, whereas non-protein thiol levels were higher after Cd and As treatment followed by those of Pb, Cr and Cu treatment. Candida sp. PS33 was able to remove 78% (Cd), 70% (As), 82% (Cu), 65% (Cr) and 87% (Pb) from the medium after 8 days of incubation. This multi-resistant yeast can be used efficiently for the removal of toxic metals from the wastewater.
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June 2017
Vol. 49, Iss. 3, Pages 761-1149
