Degradation of the herbicide isoproturon by laccase-mediator systems

Zeng, Shengquan; Qin, Xueli; Xia, Liming

doi:10.1016/j.bej.2016.12.016

Cited by 124 publications

(51 citation statements)

References 53 publications

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“…Zeng reported that isoproturon could be degraded by laccase [16]. However, laccase applications are hindered by its high production costs and ready inactivation under industrial conditions [26][27][28].…”

Section: Degradation Of Chlorimuron-ethyl By Crude Extracts Containinmentioning

confidence: 99%

“…For example, Marínbenito et al reported that pesticides were absorbed by SMS, and Singh et al found that SMS contains laccase [14,15]. Zeng et al concluded that laccase has high potential for treating industrial wastewater containing the herbicide isoproturon [16]. However, previous studies have not focused on chlorimuron-ethyl-degrading bacterial strains adhering to laccase-containing SMS to remediate historically chlorimuron-ethyl-contaminated soil.…”

Section: Introductionmentioning

confidence: 99%

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Bioremediation of Historically Chlorimuron-Ethyl-Contaminated Soil by Co-Culture Chlorimuron-Ethyl-Degrading Bacteria Combined with the Spent Mushroom Substrate

et al. 2020

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In this study, a novel chlorimuron-ethyl-degrading Pleurotus eryngiu-SMS-CB was successfully constructed for remediation of soil historically contaminated with chlorimuron-ethyl. The P. eryngiu-SMS-CB was prepared using efficient chlorimuron-ethyl-degrading cocultured bacteria, Rhodococcus sp. D310-1 and Enterobacter sp. D310-5, with spent mushroom substrate (SMS, a type of agricultural waste containing laccase) of Pleurotus eryngiu as a carrier. The chlorimuron-ethyl degradation efficiency in historically chlorimuron-ethyl-contaminated soil reached 93.1% at the end of 80 days of treatment with the P. eryngiu-SMS-CB. Although the P. eryngiu-SMS-CB altered the microbial community structure at the beginning of the 80 days, the bacterial population slowly recovered after 180 days; thus, the P. eryngiu-SMS-CB does not have an excessive effect on the long-term microbial community structure of the soil. Pot experiments indicated that contaminated soil remediation with P. eryngiu-SMS-CB reduced the toxic effects of chlorimuron-ethyl on wheat. This paper is the first to attempt to use chlorimuron-ethyl-degrading bacterial strains adhering to P. eryngiu-SMS to remediate historically chlorimuron-ethyl-contaminated soil, and the microbial community structure and P. eryngiu-SMS-CB activity in chlorimuron-ethyl-contaminated soil were traced in situ to evaluate the long-term effects of this remediation.

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Section: Degradation Of Chlorimuron-ethyl By Crude Extracts Containinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bioremediation of Historically Chlorimuron-Ethyl-Contaminated Soil by Co-Culture Chlorimuron-Ethyl-Degrading Bacteria Combined with the Spent Mushroom Substrate

et al. 2020

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“…Demethylation of the parent compound, IPU led to the formation of intermediate (1) which on further demethylation could lead to the generation of (2). Removal of oxygen (reduction) from (2) could form (3). The deamination of (3) could lead to the production of (4).…”

Section: Gc-ms Analysismentioning

confidence: 99%

Fly‐Ash Incorporated Slurry and Fixed‐Bed Approach for Heterogeneous Solar Photo‐Fenton Degradation of Isoproturon

Verma

Kaur

Bansal

et al. 2018

Env Prog and Sustain Energy

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The study presented the potential use of fly‐ash (FA) as an iron source to study photo‐Fenton degradation of isoproturon (IPU) both for slurry as well as fixed‐bed approach. Generally, metal oxide compounds, i.e., iron in FA combine with H2O2 to form a Fenton‐like reagent and produce hydroxyl radicals. The degradation rate was found to be strongly dependent on FA dosage, amount of H2O2, pH and initial concentration of IPU. Solar photo‐Fenton process at optimized conditions (FA 5.0 gL−1; H2O2 0.34 gL−1; pH 2) yielded 91.12% degradation of IPU. Recycling studies were performed by separating the used FA from the treated solution of IPU. However, a decrease in efficiency of FA for the treatment of IPU was observed due to surface fouling. To further envisage the field‐scale applications of FA for waste‐water treatment, FA beads were prepared to carry out the fixed‐bed photo‐Fenton studies for the degradation of IPU. FA beads were found to be stable or durable enough even after 10 recycles and yielded 65% degradation of IPU after 3 h of solar irradiation at an optimized dose of H2O2, i.e., 0.34 gL−1. A tentative degradation pathway for IPU has also been proposed after carefully identifying the intermediates through GC‐MS analysis. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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“…Another mediator that is involved in laccase lignin degradation and bleaching of kraft pulps is 1-Hydroxybenzotriazole (HBT) [9]. The LMS were initially used for delignification and bio-bleaching of wood pulps; nowadays, they are widely used for the degradation of xenobiotic compounds [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Commonly-used phenolic mediators are syringaldehyde, acetosyringone, vanillin, methyl vanillate, p-coumaric acid, etc. [11]. The above mediators were compared with ABTS and HBT for the decolorization of different dyes with laccase from T. versicolor and Pycnoporous cinnabarinus.…”

Section: Introductionmentioning

confidence: 99%

The Role of Natural Laccase Redox Mediators in Simultaneous Dye Decolorization and Power Production in Microbial Fuel Cells

et al. 2018

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Redox mediators could be used to improve the efficiency of microbial fuel cells (MFCs) by enhancing electron transfer rates and decreasing charge transfer resistance at electrodes. However, many artificial redox mediators are expensive and/or toxic. In this study, laccase enzyme was employed as a biocathode of MFCs in the presence of two natural redox mediators (syringaldehyde (Syr) and acetosyringone (As)), and for comparison, a commonly-used artificial mediator 2,2 -azinobis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) was used to investigate their influence on azo dye decolorization and power production. The redox properties of the mediator-laccase systems were studied by cyclic voltammetry. The presence of ABTS and As increased power density from 54.7 ± 3.5 mW m −2 (control) to 77.2 ± 4.2 mW m −2 and 62.5 ± 3.7 mW m −2 respectively. The power decreased to 23.2 ± 2.1 mW m −2 for laccase with Syr. The cathodic decolorization of Acid orange 7 (AO7) by laccase indicated a 12-16% increase in decolorization efficiency with addition of mediators; and the Laccase-Acetosyringone system was the fastest, with 94% of original dye (100 mgL −1 ) decolorized within 24 h. Electrochemical analysis to determine the redox properties of the mediators revealed that syringaldehyde did not produce any redox peaks, inferring that it was oxidized by laccase to other products, making it unavailable as a mediator, while acetosyringone and ABTS revealed two redox couples demonstrating the redox mediator properties of these compounds. Thus, acetosyringone served as an efficient natural redox mediator for laccase, aiding in increasing the rate of dye decolorization and power production in MFCs. Taken together, the results suggest that natural laccase redox mediators could have the potential to improve dye decolorization and power density in microbial fuel cells. Energies 2018, 11, 3455 2 of 12The enzyme is widely utilised in the oxidation of phenolic and non-phenolic substrates such as dyes, pesticides, antibiotics etc.The redox potential of the substrate should be lower than that of laccase for oxidation to be thermodynamically feasible. The redox potential range for fungal laccase is between 0.4-0.8 V vs. standard hydrogen electrode (SHE), which is suitable for oxidation of phenolic substrates; for non-phenolic substrates that have a redox potential of >1.3 V vs. SHE, and cannot be oxidized directly by laccase, a redox mediator is required [5]. A redox mediator is a small molecular weight compound that is oxidized by the enzyme and reduced by the substrate continuously. They act as electron shuttles for large substrates that cannot access the active site of the enzyme, e.g., due to steric hindrance [6]. In laccase mediator systems (LMS), the enzyme oxidizes the mediators to form stable radicals with high redox potential that diffuse away from the enzyme active site and oxidize the substrates and get reduced in the process. In this way, laccase indirectly oxidises substrates that have high redox potentials or large molecular sizes [7] (...

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Degradation of the herbicide isoproturon by laccase-mediator systems

Cited by 124 publications

References 53 publications

Bioremediation of Historically Chlorimuron-Ethyl-Contaminated Soil by Co-Culture Chlorimuron-Ethyl-Degrading Bacteria Combined with the Spent Mushroom Substrate

Bioremediation of Historically Chlorimuron-Ethyl-Contaminated Soil by Co-Culture Chlorimuron-Ethyl-Degrading Bacteria Combined with the Spent Mushroom Substrate

Fly‐Ash Incorporated Slurry and Fixed‐Bed Approach for Heterogeneous Solar Photo‐Fenton Degradation of Isoproturon

The Role of Natural Laccase Redox Mediators in Simultaneous Dye Decolorization and Power Production in Microbial Fuel Cells

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