Document Detail

Microbially induced separation of quartz from hematite using sulfate reducing bacteria.
MedLine Citation:
PMID:  20347277     Owner:  NLM     Status:  MEDLINE    
Cells and metabolic products of Desulfovibrio desulfuricans were successfully used to separate quartz from hematite through environmentally benign microbially induced flotation. Bacterial metabolic products such as extracellular proteins and polysaccharides were isolated from both unadapted and mineral-adapted bacterial metabolite and their basic characteristics were studied in order to get insight into the changes brought about on bioreagents during adaptation. Interaction between bacterial cells and metabolites with minerals like hematite and quartz brought about significant surface-chemical changes on both the minerals. Quartz was rendered more hydrophobic, while hematite became more hydrophilic after biotreatment. The predominance of bacterial polysaccharides on interacted hematite and of proteins on quartz was responsible for the above surface-chemical changes, as attested through adsorption studies. Surface-chemical changes were also observed on bacterial cells after adaptation to the above minerals. Selective separation of quartz from hematite was achieved through interaction with quartz-adapted bacterial cells and metabolite. Mineral-specific proteins secreted by quartz-adapted cells were responsible for conferment of hydrophobicity on quartz resulting in enhanced separation from hematite through flotation.
M R Sabari Prakasan; K A Natarajan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-07
Journal Detail:
Title:  Colloids and surfaces. B, Biointerfaces     Volume:  78     ISSN:  1873-4367     ISO Abbreviation:  Colloids Surf B Biointerfaces     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-05-03     Completed Date:  2010-08-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9315133     Medline TA:  Colloids Surf B Biointerfaces     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  163-70     Citation Subset:  IM    
Copyright Information:
2010 Elsevier B.V. All rights reserved.
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India.
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MeSH Terms
Adaptation, Physiological
Bacterial Adhesion
Bacterial Proteins / chemistry,  metabolism
Desulfovibrio desulfuricans / chemistry*,  metabolism,  ultrastructure
Electrophoresis, Polyacrylamide Gel
Ferric Compounds / chemistry*
Microscopy, Electron, Scanning
Models, Chemical
Polysaccharides, Bacterial / chemistry,  metabolism
Quartz / chemistry*
Surface Properties
Reg. No./Substance:
0/Bacterial Proteins; 0/Ferric Compounds; 0/Polysaccharides, Bacterial; 1309-37-1/ferric oxide; 14808-60-7/Quartz

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