Cadmium biosorption by yeast, Candida tropicalis CBL-1, isolated from industrial wastewater

The Journal of General and Applied Microbiology

Shahida Hasnain¹  Abdul Rehman¹  Muhammad Sohail Anjum¹ 

[1] Department of Microbiology and Molecular Genetics, University of the Punjab

关键词: bioremediation;    cadmium;    Candida tropicalis CBL-1;    glutathione;    metabolic inhibitors;   

DOI  :  10.2323/jgam.56.359

学科分类：微生物学和免疫学

来源: Applied Microbiology, Molecular and Cellulrar Biosciences Research Foundation

【 摘 要 】

The present study is aimed at assessing the ability of metal-resistant yeast, Candida tropicalis CBL-1, to uptake metal from liquid medium. The minimum inhibitory concentration of Cd(II) against Candida tropicalis CBL-1 was 2,800 mg/L. The yeast could also tolerate Zn(II) (3,100 mg/L), Hg(II) (2,400 mg/L), Ni(II) (2,200 mg/L), Cr(VI) (2,000 mg/L), Pb(II) (1,100 mg/L), and Cu(II) (2,200 mg/L). The yeast isolate showed typical growth curves but lag and log phases extended in the presence of cadmium. The yeast isolate showed optimum growth at 30ºC and pH 7. The metal processing ability of the isolate was determined in a medium containing 100 mg/L of Cd(II). Candida tropicalis CBL-1, could reduce Cd(II) 59%, 64% and 70% from the medium after 48, 96 and 144 h, respectively. C. tropicalis CBL-1 was also able to remove Cd(II) 46% and 60% from the wastewater after 6 and 12 days, respectively. Cd produced an increase in glutathione and non-protein thiols level by 37% (17.50±0.8−24.0±1.2) and 18% (3.30±0.7− 3.90±0.8) at 100 mg/L concentration, respectively. Metal tolerance and accumulation together with changes in the GSH status and non-protein thiols under Cd exposure were studied in C. tropicalis.

【 授权许可】

Unknown