Document Detail

Toxic effect of biosurfactant addition on the biodegradation of phenanthrene.
MedLine Citation:
PMID:  16398112     Owner:  NLM     Status:  MEDLINE    
The effect of the biosurfactant rhamnolipid on phenanthrene biodegradation and cell growth of phenanthrene degraders was investigated. To compare the effect of rhamnolipid addition, two bacterial strains, 3Y and 4-3, which were isolated from a diesel-contaminated site in Korea, were selected. Without the biosurfactant, large amounts of phenanthrene were degraded with both strains at neutral pH, with higher rates of phenanthrene degradation when the cell growth was higher. Upon the addition of 240 mg/L rhamnolipid, the phenanthrene degradation and optical density were reduced, with this inhibitory effect similar for both 3Y and 4-3. To explain this inhibition, the cell growths of both strains were monitored with various concentrations of rhamnolipid, which showed significant toxic effects toward strain 3Y, but was nontoxic toward 4-3. Combining the inhibitory and toxicity results with regard to the biodegradation, different mechanisms can be suggested for each strain. In the biodegradation experiments, the toxicity of rhamnolipid itself mainly was responsible for the inhibitory effect in the case of 3Y, whereas the toxicity of solubilized phenanthrene or the increased toxicity of rhamnolipid in the presence of solubilized phenanthrene could have resulted in the inhibitory effect in the case of 4-3. This study demonstrated that the effectiveness of biosurfactant-enhanced biodegradation can be significantly different depending on the strain, and the toxicity of the biosurfactant should be considered as an important factor.
Kyung-Hee Shin; Yeonghee Ahn; Kyoung-Woong Kim
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  24     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2006-01-09     Completed Date:  2006-03-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2768-74     Citation Subset:  IM    
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 1, Oryong-dong, Buk-gu, Gwangju, Korea.
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MeSH Terms
Biodegradation, Environmental / drug effects
Cell Proliferation / drug effects
Glycolipids / toxicity*
Hydrogen-Ion Concentration
Phenanthrenes / metabolism*
Pseudomonas / cytology,  drug effects
Sphingomonas / cytology,  drug effects
Surface-Active Agents / toxicity*
Reg. No./Substance:
0/Glycolipids; 0/Phenanthrenes; 0/Surface-Active Agents; 0/rhamnolipid; 85-01-8/phenanthrene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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