Comparative studies on metal biosorption by two strains of Cladosporium cladosporioides

Two strains of a fungus, Cladosporium cladosporioides 1 and C. cladosporioides 2 showed different metal biosorption properties. Strain 1 showed preferential sorption of gold and silver, while strain 2 could bind metals such as copper and cadmium in addition to gold and silver. Strain 1 had a cell-wa...

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Bibliographic Details
Published in:Bioresource technology 2001-12, Vol.80 (3), p.211-215
Main Authors: Pethkar, A.V, Kulkarni, S.K, Paknikar, K.M
Format: Article
Language:English
Subjects:
Absorption
Biological and medical sciences
Biosorption
Biotechnology
cadmium
Carbohydrates - chemistry
Cell Wall - chemistry
Cell-wall analysis
Chemical industry. Chemical engineering
Cladosporium - metabolism
Cladosporium cladosporioides
Fourier transform infrared spectroscopy
FTIR
Fundamental and applied biological sciences. Psychology
fungi
Gold
hexosamines
Hydrogen-Ion Concentration
Industrial applications and implications. Economical aspects
Lipids - chemistry
Mechanism
Metals - metabolism
nitrogen
polymers
Polymers - chemistry
Silver
Spectrophotometry - methods
Spectroscopy, Fourier Transform Infrared - methods
X-ray photoelectron spectroscopy
XPS
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Summary:Two strains of a fungus, Cladosporium cladosporioides 1 and C. cladosporioides 2 showed different metal biosorption properties. Strain 1 showed preferential sorption of gold and silver, while strain 2 could bind metals such as copper and cadmium in addition to gold and silver. Strain 1 had a cell-wall hexosamine content of 0.1%. X-ray photoelectron spectroscopy (XPS) and Fourier transform infra-red spectroscopy (FTIR) analyses indicated that nitrogen was not involved in metal biosorption by the strain. In strain 2 the cell-wall hexosamine content was 150 times that of strain 1. These results indicated that hexosamine was responsible for non-specific metal binding while cell-wall polymers other than hexosamines had a role in conferring selectivity in precious-metal binding.
ISSN:0960-8524
1873-2976
DOI:10.1016/S0960-8524(01)00080-3