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Changes in mutagenicity during biodegradation of fenitrothion
Taku Matsushita1, Yoshihiko Matsui, Shotaro Taniwaki
1Department of Civil Engineering, Gifu University, Japan. taku_m@cc.gifu-u.ac.jp
Chemosphere
|May 9, 2002
Summary
Biodegradation of fenitrothion under anaerobic conditions increased solution mutagenicity, partly due to amino-fenitrothion formation. Aerobic biodegradation did not significantly alter mutagenicity.
Area of Science:
- Environmental Microbiology
- Toxicology
- Bioremediation
Background:
- Fenitrothion is an organophosphate insecticide widely used in agriculture.
- Understanding the environmental fate and toxicological impact of pesticide biodegradation is crucial.
Purpose of the Study:
- To investigate the changes in mutagenicity of fenitrothion during biodegradation under different incubation conditions.
- To identify potential mutagenic metabolites formed during fenitrothion degradation.
Main Methods:
- Batch cultures of fenitrothion-degrading bacteria were incubated under anaerobic and aerobic conditions.
- Fenitrothion concentration and solution mutagenicity (using strains YG1029 and YG1042) were measured over 12 days.
- Metabolite analysis was performed to identify degradation products.
Main Results:
- Fenitrothion was nearly completely decomposed by day 12 under both anaerobic and aerobic conditions.
- Indirect mutagenicity significantly increased during anaerobic biodegradation.
- Amino-fenitrothion was identified as a metabolite contributing to the increased mutagenicity under anaerobic conditions.
Conclusions:
- Anaerobic biodegradation of fenitrothion can lead to the formation of mutagenic compounds.
- Aerobic biodegradation of fenitrothion appears to be a safer degradation pathway regarding mutagenicity.
- Further research is needed to fully characterize the toxicological profiles of pesticide biodegradation metabolites.