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Plos One : Biodegradation of Chlorpyrifos and Its Hydrolysis Product 3,5,6-trichloro-2-pyridinol by a New Fungal Strain Cladosporium Cladosporioides Hu-01, Volume 7

By Lin, Baochuan

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Book Id: WPLBN0003934426
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Reproduction Date: 2015

Title: Plos One : Biodegradation of Chlorpyrifos and Its Hydrolysis Product 3,5,6-trichloro-2-pyridinol by a New Fungal Strain Cladosporium Cladosporioides Hu-01, Volume 7  
Author: Lin, Baochuan
Volume: Volume 7
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
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Publisher: Plos

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Lin, B. (n.d.). Plos One : Biodegradation of Chlorpyrifos and Its Hydrolysis Product 3,5,6-trichloro-2-pyridinol by a New Fungal Strain Cladosporium Cladosporioides Hu-01, Volume 7. Retrieved from http://netlibrary.net/


Description
Description : Intensive use of chlorpyrifos has resulted in its ubiquitous presence as a contaminant in surface streams and soils. It is thus critically essential to develop bioremediation methods to degrade and eliminate this pollutant from environments. We present here that a new fungal strain Hu-01 with high chlorpyrifos-degradation activity was isolated and identified as Cladosporium cladosporioides based on the morphology and 5.8S rDNA gene analysis. Strain Hu-01 utilized 50 mg?L21 of chlorpyrifos as the sole carbon of source, and tolerated high concentration of chlorpyrifos up to 500 mg?L21. The optimum degradation conditions were determined to be 26.8uC and pH 6.5 based on the response surface methodology (RSM). Under these conditions, strain Hu-01 completely metabolized the supplemented chlorpyrifos (50 mg?L21) within 5 d. During the biodegradation process, transient accumulation of 3,5,6-trichloro-2-pyridinol (TCP) was observed. However, this intermediate product did not accumulate in the medium and disappeared quickly. No persistent accumulative metabolite was detected by gas chromatopraphy-mass spectrometry (GC-MS) analysis at the end of experiment. Furthermore, degradation kinetics of chlorpyrifos and TCP followed the first-order model. Compared to the non-inoculated controls, the half-lives (t1/2) of chlorpyrifos and TCP significantly reduced by 688.0 and 986.9 h with the inoculum, respectively. The isolate harbors the metabolic pathway for the complete detoxification of chlorpyrifos and its hydrolysis product TCP, thus suggesting the fungus may be a promising candidate for bioremediation of chlorpyrifos-contaminated water, soil or crop.

 

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