Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 90, Issue 4, Pages 1471-1483Publisher
SPRINGER
DOI: 10.1007/s00253-011-3136-3
Keywords
Pyrethroids; Deltamethrin; 3-Phenoxybenzaldehyde; Biodegradation; Streptomyces aureus; Kinetics
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Funding
- National Natural Science Foundation [30871660]
- Project of Scientific Technological Planning of Guangdong Province, P.R. China [2009B020310005]
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A newly isolated actinomycete strain HP-S-01 from activated sludge could effectively degrade deltamethrin and its major hydrolysis product 3-phenoxybenzaldehyde. Based on the morphological, cultural, physio-biochemical characteristics, and 16S rDNA sequence analysis, strain HP-S-01 was identified as Streptomyces aureus. Strain HP-S-01 was also found highly efficient in degrading cyfluthrin, bifenthrin, fenvalerate, fenpropathrin, permethrin, and cypermethrin. Strain HP-S-01 rapidly degraded deltamethrin without a lag phase over a wide range of temperature (18 similar to 38 degrees C) and pH (5 similar to 10), and metabolized to produce alpha-hydroxy-3-phenoxy-benzeneacetonitrile and 3-phenoxybenzaldehyde by hydrolysis of the carboxylester linkage. The 3-phenoxybenzaldehyde was further oxidized to form 2-hydroxy-4-methoxy benzophenone resulting in its detoxification. No persistent accumulative product was detected by gas chromatography-mass spectrometry (GC/MS) analysis. Response surface methodology was used to optimize degradation conditions. Strain HP-S-01 completely removed 50 similar to 300 mg L-1 deltamethrin within 7 days under the optimal degradation conditions. Furthermore, the biodegradation kinetics corresponded with the first-order model. Therefore, strain HP-S-01 is suitable for the efficient and rapid bioremediation of pyrethroid-contaminated environment.
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