Efficient biotransformation of herbicide diuron by bacterial strain Micrococcus sp. PS-1

Sharma, Priyanka; Chopra, Adity; Cameotra, Swaranjit Singh; Suri, C. Raman

doi:10.1007/s10532-010-9357-9

Cited by 33 publications

(17 citation statements)

References 23 publications

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“…[102] Figure 1. Degradation pathway of diuron by Micrococcus sp, confirmed by FTIR spectra and HPLC [101] Strains of Aquaspirillum itersonii, Aquaspirillum sp. and Paracoccus denitrificans were shown to successfully use 3,4-DCA as the only source of carbon and nitrogen for growth; [103] the latter was able to metabolize the pollutant at concentrations up to 150 mg L -1 , through oxidation to odiphenol, intradiol cleavage of 4,5-dichloropyrocatechol, and further stages of preparatory metabolism associated with dehalogenation.…”

Section: Bacteriamentioning

confidence: 82%

“…to degrade 96% of diuron within 30 hours of incubation, at a concentration of 250 ppm, and with the addition of non-ionic detergent (0.01%). [101] The authors proposed a mechanism whereby a methyl group is removed, followed by a hydrolysis step, leading to the accumulation of 3,4-DCA, which undergoes conversion to 4,5dichlorobenzene-1,2-diol, and further intermediates, within 24 hours of test commencement (Fig. 1).…”

Section: Bacteriamentioning

confidence: 99%

“…Henry's constant 0.05 Pa m 3 mol -1 [15] Solubility in water 580 mg L -1 at 293 K [15] Octanol-water partition coefficient (log Kow) 2.7 (shaken flask method) [5,16] Estimated surface water half life 18 days [15] Measured rate of loss from outdoor water systems 0.11 -0.17 day -1 [4] 0.06 -0.14 day -1 [49] Estimated atmospheric half life 9 hours [15] Estimated half-life in soil and sediment 470 -1500 days [51] Figure 1. Degradation pathway of diuron by Micrococcus sp, confirmed by FTIR spectra and HPLC [101] Halloysite [12] 76 [50] Activated carbon SKT [50] 1028 0.53 -0.5 -Activated carbon RS [50] 410 0.5 364 -0.5 - Figure 2. Intermediates formed during photo-degradation of 3,4-DCA using Ti-V (sol) catalyst, confirmed by HPLC and GC-MS analysis [11]…”

Section: Figures and Tablesmentioning

confidence: 99%

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State of the art of the environmental behaviour and removal techniques of the endocrine disruptor 3,4-dichloroaniline

Tasca

Fletcher

2017

Journal of Environmental Science and Health, Part A

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In recent years, the presence of Endocrine Disrupting Chemicals (EDCs) in wastewater discharges from agricultural and industrial sources, fresh- and estuarine-waters, as well as soils, has been reported in the literature. Studies of adverse changes in wildlife, linked to environmental exposure to these substances, and the suggestion that humans could also be at similar risk of adverse health effects, have raised concern for urgent action to understand and reduce such risks. 3,4-Dichloroaniline (3,4-DCA) has been recognized as an EDC, with regards to endocrine disruption data for both wildlife populations and human health. 3,4-DCA is present in the environment as a product of the biodegradation of phenylurea and phenylcarbamate pesticides ; furthermore, it can be introduced from industrial and municipal wastewater that is insufficiently purified, or via accidental spills. Increasing concentrations of 3,4-DCA in soil and water are the result of its high persistence and accumulation, as well as its low biodegradability. Hence, remediation techniques require in-depth study, especially when considering the low removal achieved by traditional activated sludge treatments, and the generation of carcinogenic trihalomethanes as a consequence of the chlorine oxidation methods frequently used in drinking water plants. Fe/HO systems, photodegradation using doped TiO, and the use of dielectric barrier discharge reactors, seem to be the most promising techniques for the removal of 3,4-DCA from water.

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Section: Bacteriamentioning

confidence: 82%

Section: Bacteriamentioning

confidence: 99%

Section: Figures and Tablesmentioning

confidence: 99%

See 1 more Smart Citation

State of the art of the environmental behaviour and removal techniques of the endocrine disruptor 3,4-dichloroaniline

Tasca

Fletcher

2017

Journal of Environmental Science and Health, Part A

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“…In fact, the partial recovery (see also SI2) could correspond to physiological adaptation (acclimation), cellular detoxification processes, and/or biodegradation of diuron as the result of cytochrome P450-mediated N-demethylation. Cytochrome P450 is produced by a wide range of microorganisms, and degradation can be fast (e.g., biodegradation up to 20% after the 3 first hours of incubation with 250 ppm diuron, in Sharma et al, 2010).…”

Section: Time Dependency Of Ecotoxicity Parametersmentioning

confidence: 99%

A Time-Dose Response Model to Assess Diuron-Induced Photosynthesis Inhibition in Freshwater Biofilms

Morin

Chaumet

Mazzella

2018

Front. Environ. Sci.

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Contamination by herbicides is reported in most freshwater environments. These biologically active compounds may impact the non-target biota such as benthic biofilms, at the base of the trophic chain. In agricultural watersheds, herbicides occur as pulses in the system, and traditional dose-response analysis performed at a given duration of exposure (hours to days) may not predict accurately the risk of adverse impacts at shorter temporal scales (minutes to hours) corresponding to pulse exposures. To assess the time-response relationship in biofilms exposed to herbicides, we used diuron, an inhibitor of photosynthesis, to perform bioassays (time-response curves) with the aim of characterizing the initial steps of photosynthesis decrease after exposure to the herbicide (from seconds to hours), for different concentrations of exposure. Diuron-induced inhibition of photosynthesis reflects blockage of electron transfer in PSII, therefore we defined the time lag to reach the threshold of 50% photosynthesis inhibition (t 1/2) as the time for diuron to reach its target site (adsorption, distribution). We found a rapid decrease in photosynthetic efficiency: t 1/2 values were dose-dependent and ranged from <30 s (highest concentration of exposure) to 7 ′ 20 ′′ (lowest concentration). While dose-response curves are influenced by the initial biomass or nature of biofilms, time-response curves yielded similar t 1/2 for contrasted biofilms, making this parameter a unique response to be valuably incorporated into an ecotoxicology framework. We also assessed the variability of the response as a function of previous short-term (3 h) exposure to diuron. The t 1/2 values obtained were consistent with those obtained on non-exposed biofilms, but repeated pulses of diuron exacerbated the decrease in photosynthetic yields. This time-response approach highlighted that diuron reaches its cellular target almost instantaneously (<1 min), independently of biological parameters (chlorophyll a concentration, adaptation related to exposure history). Reversibility of toxic impacts a few hours after diuron removal was not fully demonstrated, suggesting that the kinetics of diuron release from cells to uncontaminated medium are much slower than binding rates. Our results confirm that repeated exposure is very likely to impair freshwater biofilms, in particular if pulses occur at high frequency.

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“…There are only a few studies in literature related to persistence and enhanced biodegradation of quinalphos. Earlier work by this research group included degradation of atrazine by Acinetobacter genus (Singh et al, 2004), measurement of atrazine by a new fluorometric assay (Singh et al, 2009), biotransformation of diuron by bacterial strain Micrococcus (Sharma et al, 2010), and enhanced biodegradation of endosulfan in the presence of a biosurfactant (Awasthi et al, 1999). In continuation of previous research, the present study addresses (1) natural degradation (persistence) of quinalphos in water and identification of metabolite formed, and (2) induced biodegradation of quinalphos in water by indigenous microbial populations in a soil matrix.…”

Section: Introductionmentioning

confidence: 99%

Persistence and Biodegradation of Quinalphos Using Soil Microbes

Dhanjal

Kaur

Sud

et al. 2014

Water Environment Research

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The present study reports the degradation of the persistent and toxic organophosphate, quinalphos, by employing microorganisms that were already members of the natural soil community for degradation. Bacillus and Pseudomonas spp., both of which are capable of degrading quinalphos from aqueous streams, were isolated from different contaminated soils. Batch experiments were performed to determine the natural and induced biodegradation of quinalphos in the aqueous medium. The rate of degradation was analyzed through determination of residual concentration using UV‐Vis spectrophotometer and high‐performance liquid chromatography. A single peak of a metabolite was observed on the 160th day, and identified as dihydroxy quinalphos oxon by mass spectrometry. The presence of quinalphos and its metabolite in water over an extended period prompted the authors to investigate its induced biodegradation using indigenous microbes extracted from soil. For biodegradation studies, the isolated microbes were inoculated into minimal media with quinalphos for 17 days. The results revealed that >80% of quinalphos was degraded in 17 days in the presence of isolated microbes, and no metabolite was observed during the biodegradation process.

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Efficient biotransformation of herbicide diuron by bacterial strain Micrococcus sp. PS-1

Cited by 33 publications

References 23 publications

State of the art of the environmental behaviour and removal techniques of the endocrine disruptor 3,4-dichloroaniline

State of the art of the environmental behaviour and removal techniques of the endocrine disruptor 3,4-dichloroaniline

A Time-Dose Response Model to Assess Diuron-Induced Photosynthesis Inhibition in Freshwater Biofilms

Persistence and Biodegradation of Quinalphos Using Soil Microbes

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