Surface chemical studies of Thiobacillus ferrooxidans with reference to copper tolerance

被引:31
作者
Das, A
Modak, JM
Natarajan, KA [1 ]
机构
[1] Indian Inst Sci, Dept Met, Bangalore 560012, Karnataka, India
[2] Indian Inst Sci, Dept Chem Engn, Bangalore 560012, Karnataka, India
来源
ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY | 1998年 / 73卷 / 03期
关键词
Thiobacillus ferrooxidans; copper tolerance; cell surface modifications;
D O I
10.1023/A:1000858525755
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
A strain of Thiobacillus ferrooxidans was adapted to grow at higher concentrations of copper by single step culturing in the presence of 20 g/L (0.314 mol/L) cupric ions added to 9K medium. Exposure to copper results in change in the surface chemistry of the microorganism. The isoelectric point of the adapted strain (pI=4.7) was observed to be at a higher pH than that of the wild unadapted strain(pI=2.0). Compared to the wild strain, the copper adapted strain was found to be more hydrophobic and showed enhanced attachment efficiency to the pyrite mineral. The copper adsorption ability of the adapted strain was also found to be higher than that of the wild strain. Fourier transform infrared spectroscopy of adapted cells suggested that a proteinaceous new cell surface component is synthesized by the adapted strain. Treatment of adapted cells with proteinase-K, resulted in complete loss of tolerance to copper, reduction in copper adsorption and hydrophobicity of the adapted cells. These observations strongly suggest a role played by cell surface modifications of Thiobacillus ferrooxidans in imparting the copper tolerance to the cells and bioleaching of sulphide minerals.
引用
收藏
页码:215 / 222
页数:8
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