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Sun S, Chen W, Peng K, Chen X, Chen J. Characterization of a novel amidohydrolase with promiscuous esterase activity from a soil metagenomic library and its application in degradation of amide herbicides. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:20970-20982. [PMID: 38383926 PMCID: PMC10948491 DOI: 10.1007/s11356-024-32362-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 02/03/2024] [Indexed: 02/23/2024]
Abstract
Amide herbicides have been extensively used worldwide and have received substantial attention due to their adverse environmental effects. Here, a novel amidohydrolase gene was identified from a soil metagenomic library using diethyl terephthalate (DET) as a screening substrate. The recombinant enzyme, AmiH52, was heterologously expressed in Escherichia coli and later purified and characterized, with the highest activity occurring at 40 ℃ and pH 8.0. AmiH52 was demonstrated to have both esterase and amidohydrolase activities, which exhibited highly specific activity for p-nitrophenyl butyrate (2669 U/mg) and degrading activity against several amide herbicides. In particular, it displayed the strongest activity against propanil, with a high degradation rate of 84% at 8 h. A GC-MS analysis revealed that propanil was transformed into 3,4-dichloroaniline (3,4-DCA) during this degradation. The molecular interactions and binding stability were then analyzed by molecular docking and molecular dynamics simulation, which revealed that several key amino acid residues, including Tyr164, Trp66, Ala59, Val283, Arg58, His33, His191, and His226, are involved in the specific interactions with propanil. This study provides a function-driven screening method for amide herbicide hydrolase from the metagenomic libraries and a promising propanil-degrading enzyme (AmiH52) for potential applications in environmental remediation.
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Affiliation(s)
- Shengwei Sun
- Key Laboratory of Food Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
- School of Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK
| | - Wanqi Chen
- Key Laboratory of Food Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Kailin Peng
- Key Laboratory of Food Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Xueyingzi Chen
- Key Laboratory of Food Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Jinju Chen
- School of Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
- Department of Materials, Loughborough University, Loughborough, LE11 3TU, UK.
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Gunasekaran V, Canela N, Constantí M. Comparative Proteomic Analysis of an Ethyl Tert-Butyl Ether-Degrading Bacterial Consortium. Microorganisms 2022; 10:microorganisms10122331. [PMID: 36557584 PMCID: PMC9781318 DOI: 10.3390/microorganisms10122331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/17/2022] [Accepted: 11/22/2022] [Indexed: 11/29/2022] Open
Abstract
A bacterial consortium capable of degrading ethyl tert-butyl ether (ETBE) as a sole carbon source was enriched and isolated from gasoline-contaminated water. Arthrobacter sp., Herbaspirillum sp., Pseudacidovorax sp., Pseudomonas sp., and Xanthomonas sp. were identified as the initial populations with the 16S rDNA analysis. The consortium aerobically degraded 49% of 50 mg/L of ETBE, in 6 days. The ETBE degrading efficiency of the consortium increased to 98% even with the higher concentrations of ETBE (1000 mg/L) in the subsequent subcultures, which accumulated tert-butyl alcohol (TBA). Xanthomonas sp. and Pseudomonas sp. were identified as the predominant ETBE degrading populations in the final subculture. The metaproteome of the ETBE-grown bacterial consortium was compared with the glucose-grown bacterial consortium, using 2D-DIGE. Proteins related to the ETBE metabolism, stress response, carbon metabolism and chaperones were found to be abundant in the presence of ETBE while proteins related to cell division were less abundant. The metaproteomic study revealed that the ETBE does have an effect on the metabolism of the bacterial consortium. It also enabled us to understand the responses of the complex bacterial consortium to ETBE, thus revealing interesting facts about the ETBE degrading bacterial community.
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Affiliation(s)
- Vijayalakshmi Gunasekaran
- Departament d’Enginyeria Química, Universitat Rovira i Virgili, Av. Països Catalans, 26, 43007 Tarragona, Spain
- FA Bio, Harpenden AL5 2JQ, UK
- Correspondence: (V.G.); (M.C.); Tel.: +34-977-558457 (M.C.)
| | - Núria Canela
- Centre for Omic Sciences (COS), Joint Unit Universitat Rovira i Virgili-EURECAT, Av. Universitat 1, 43204 Reus, Spain
| | - Magda Constantí
- Departament d’Enginyeria Química, Universitat Rovira i Virgili, Av. Països Catalans, 26, 43007 Tarragona, Spain
- Correspondence: (V.G.); (M.C.); Tel.: +34-977-558457 (M.C.)
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Duc HD, Thuy NTD, Truc HTT, Nhu NTH, Oanh NT. Degradation of butachlor and propanil by Pseudomonas sp. strain But2 and Acinetobacter baumannii strain DT. FEMS Microbiol Lett 2021; 367:5902848. [PMID: 32897322 DOI: 10.1093/femsle/fnaa151] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Accepted: 09/03/2020] [Indexed: 12/29/2022] Open
Abstract
Herbicides have been extensively used globally, resulting in severe environmental pollution. Novel butachlor-degrading Pseudomonas sp. strain But2 isolated from soil can degrade butachlor regardless of the concentration and grows without a lag phase. Specific degradation was increased at 0.01-0.1 mM, and did not change significantly at higher concentrations. During degradation, 2-chloro-N-(2,6-diethylphenyl) acetamide, 2,6-diethylaniline, and 1,3-diethylbenzene were formed, which indicated that deamination occurred. Moreover, Pseudomonas sp. strains could tolerate propanil at up to 0.8 mM. The mixed bacterial culture of Pseudomonas sp. But2 and Acinetobacter baumannii DT (a propanil-degrading bacterial strain) showed highly effective biodegradation of both butachlor and propanil in liquid media and soil. For example, under treatment with the mixed culture, the half-lives of propanil and butachlor were 1 and 5 days, respectively, whereas those for the control were 3 and 15 days. The adjuvants present in herbicides reduced degradation in liquid media, but did not influence herbicide removal from the soil. The results showed that the mixed bacteria culture is a good candidate for the removal of butachlor and propanil from contaminated soils.
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Affiliation(s)
- Ha Danh Duc
- Faculty of Engineering and Technology, Dong Thap University, 783 Pham Huu Lau Street, Cao Lanh City, Dong Thap Province, Viet Nam
| | - Nguyen Thi Dieu Thuy
- Center for Chemical analysis, Dong Thap University, 783 Pham Huu Lau Street, Cao Lanh City, Dong Thap Province, Viet Nam
| | - Huynh Thi Thanh Truc
- Faculty of Engineering and Technology, Dong Thap University, 783 Pham Huu Lau Street, Cao Lanh City, Dong Thap Province, Viet Nam
| | - Nguyen Thi Huynh Nhu
- Faculty of Engineering and Technology, Dong Thap University, 783 Pham Huu Lau Street, Cao Lanh City, Dong Thap Province, Viet Nam
| | - Nguyen Thi Oanh
- Faculty of Engineering and Technology, Dong Thap University, 783 Pham Huu Lau Street, Cao Lanh City, Dong Thap Province, Viet Nam
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Oanh NT, Duc HD, Ngoc DTH, Thuy NTD, Hiep NH, Van Hung N. Biodegradation of propanil by Acinetobacter baumannii DT in a biofilm-batch reactor and effects of butachlor on the degradation process. FEMS Microbiol Lett 2020; 367:5698327. [PMID: 31913459 DOI: 10.1093/femsle/fnaa005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 01/07/2020] [Indexed: 12/13/2022] Open
Abstract
The herbicide, propanil, has been extensively applied in weed control, which causes serious environmental pollution. Acinetobacter baumannii DT isolated from soil has been used to determine the degradation rates of propanil and 3,4-dichloroaniline by freely suspended and biofilm cells. The results showed that the bacterial isolate could utilize both compounds as sole carbon and nitrogen sources. Edwards's model could be fitted well to the degradation kinetics of propanil, with the maximum degradation of 0.027 ± 0.003 mM h-1. The investigation of the degradation pathway showed that A. baumannii DT transformed propanil to 3,4-dichloroaniline before being completely degraded via the ortho-cleavage pathway. In addition, A. baumannii DT showed high tolerance to butachlor, a herbicide usually mixed with propanil to enhance weed control. The presence of propanil and butachlor in the liquid media increased the cell surface hydrophobicity and biofilm formation. Moreover, the biofilm reactor showed increased degradation rates of propanil and butachlor and high tolerance of bacteria to these chemicals. The obtained results showed that A. baumannii DT has a high potential in the degradation of propanil.
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Affiliation(s)
- Nguyen Thi Oanh
- Center of chemical analysis, Dong Thap University, 783 Pham Huu Lau, Cao Lanh city, Dong Thap Province, 870000, Vietnam
| | - Ha Danh Duc
- Center of chemical analysis, Dong Thap University, 783 Pham Huu Lau, Cao Lanh city, Dong Thap Province, 870000, Vietnam
| | - Dau Thi Hong Ngoc
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Ha Noi City, 100000, Vietnam
| | - Nguyen Thi Dieu Thuy
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Ha Noi City, 100000, Vietnam
| | - Nguyen Huu Hiep
- Institute of Biotechnology, Vietnam Academy of Science and Technology Campus II, 3/2 Street, Xuan Khanh, Nink Kieu, Can Tho City, 90000, Vietnam
| | - Nguyen Van Hung
- Center of chemical analysis, Dong Thap University, 783 Pham Huu Lau, Cao Lanh city, Dong Thap Province, 870000, Vietnam
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Tasca AL, Fletcher A. State of the art of the environmental behaviour and removal techniques of the endocrine disruptor 3,4-dichloroaniline. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2018; 53:260-270. [PMID: 29173038 DOI: 10.1080/10934529.2017.1394701] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In recent years, the presence of Endocrine Disrupting Chemicals (EDCs) in wastewater discharges from agricultural and industrial sources, [1] fresh- and estuarine-waters, as well as soils, has been reported in the literature. [2] 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, [3-5] 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. [5] 3,4-DCA is present in the environment as a product of the biodegradation of phenylurea and phenylcarbamate pesticides [6,7] ; furthermore, it can be introduced from industrial and municipal wastewater that is insufficiently purified, or via accidental spills. [8-10] 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. [11,12] 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. [13] Fe0/H2O2 systems, photodegradation using doped TiO2, 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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Affiliation(s)
- Andrea Luca Tasca
- a Department of Chemical and Process Engineering , University of Strathclyde , Glasgow , UK
| | - Ashleigh Fletcher
- a Department of Chemical and Process Engineering , University of Strathclyde , Glasgow , UK
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6
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Hanapiah M, Zulkifli SZ, Mustafa M, Mohamat-Yusuff F, Ismail A. Isolation, characterization, and identification of potential Diuron-degrading bacteria from surface sediments of Port Klang, Malaysia. MARINE POLLUTION BULLETIN 2018; 127:453-457. [PMID: 29475685 DOI: 10.1016/j.marpolbul.2017.12.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 11/29/2017] [Accepted: 12/05/2017] [Indexed: 06/08/2023]
Abstract
Diuron is an alternative biocide suggested to replace organotin in formulating antifouling paints to be applied on water-going vessels hull. However, it is potentially harmful to various non-targeted marine organisms due to its toxic properties. Present study aimed to isolate, screen and identify the potential of Diuron-degrading bacteria collected from the marine sediments of Port Klang, Malaysia. Preliminary screening was conducted by exposing isolated bacteria to 430ng/L (background level), followed by 600ng/L and 1000ng/L of Diuron concentrations. Nine bacteria colonies survived the exposure of the above concentrations. However, only two strains can tolerate to survive up to 1000μg/L, which were then characterised and identified using phenotypic tests and the standard 16S rRNA molecular identification. The strains were identified as Comamonas jiangduensis SZZ 10 and Bacillus aerius SZZ 19 (GenBank accession numbers: KU942479 and KU942480, respectively). Both strains have the potential of Diuron biodegradation for future use.
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Affiliation(s)
- Munirah Hanapiah
- Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Syaizwan Zahmir Zulkifli
- Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
| | - Muskhazli Mustafa
- Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Ferdaus Mohamat-Yusuff
- Department of Environmental Sciences, Faculty of Environmental Studies, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Ahmad Ismail
- Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
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Carena L, Minella M, Barsotti F, Brigante M, Milan M, Ferrero A, Berto S, Minero C, Vione D. Phototransformation of the Herbicide Propanil in Paddy Field Water. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:2695-2704. [PMID: 28145687 DOI: 10.1021/acs.est.6b05053] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
When irradiated in paddy-field water, propanil (PRP) undergoes photodegradation by direct photolysis, by reactions with •OH and CO3•-, and possibly also with the triplet states of chromophoric dissolved organic matter. Irradiation also inhibits the nonphotochemical (probably biological) degradation of PRP. The dark- and light-induced pathways can be easily distinguished because 3,4-dichloroaniline (34DCA, a transformation intermediate of considerable environmental concern) is produced with almost 100% yield in the dark but not at all through photochemical pathways. This issue allows an easy assessment of the dark process(es) under irradiation. In the natural environment, we expect PRP photodegradation to be important only in the presence of elevated nitrate and/or nitrite levels, e.g., [NO3-] approaching 1 mmol L-1 (corresponding to approximately 60 mg L-1). Under these circumstances, •OH and CO3•- would play a major role in PRP phototransformation. Because flooded paddy fields are efficient denitrification bioreactors that can achieve decontamination of nitrate-rich water used for irrigation, irrigation with such water would both enhance PRP photodegradation and divert PRP dissipation processes away from the production of 34DCA, at least in the daylight hours.
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Affiliation(s)
- Luca Carena
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Marco Minella
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Francesco Barsotti
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Marcello Brigante
- Clermont Université, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, & CNRS, UMR 6296, ICCF, BP 80026 , F-63177 Aubière, France
| | - Marco Milan
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università di Torino , Largo Paolo Braccini 2, 10095 Grugliasco (TO), ITALY
| | - Aldo Ferrero
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università di Torino , Largo Paolo Braccini 2, 10095 Grugliasco (TO), ITALY
| | - Silvia Berto
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Claudio Minero
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Davide Vione
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
- Università di Torino , Centro Interdipartimentale NatRisk, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy
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Campos M, Karas PS, Perruchon C, Papadopoulou ES, Christou V, Menkissoglou-Spiroudi U, Diez MC, Karpouzas DG. Novel insights into the metabolic pathway of iprodione by soil bacteria. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:152-163. [PMID: 27704380 DOI: 10.1007/s11356-016-7682-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 09/12/2016] [Indexed: 06/06/2023]
Abstract
Microbial degradation constitutes the key soil dissipation process for iprodione. We recently isolated a consortium, composed of an Arthrobacter sp. strain C1 and an Achromobacter sp. strain C2, that was able to convert iprodione to 3,5-dichloroaniline (3,5-DCA). However, the formation of metabolic intermediates and the role of the strains on iprodione metabolism remain unknown. We examined the degradation of iprodione and its suspected metabolic intermediates, 3,5-dichlorophenyl-carboxamide (metabolite I) and 3,5-dichlorophenylurea-acetate (metabolite II), by strains C1 and C2 and their combination under selective (MSM) and nutrient-rich conditions (LB). Bacterial growth during degradation of the tested compounds was determined by qPCR. Strain C1 rapidly degraded iprodione (DT50 = 2.3 h) and metabolite II (DT50 = 2.9 h) in MSM suggesting utilization of isopropylamine, transiently formed by hydrolysis of iprodione, and glycine liberated during hydrolysis of metabolite II, as C and N sources. In contrast, strain C1 degraded metabolite I only in LB and growth kinetics suggested the involvement of a detoxification process. Strain C2 was able to transform iprodione and its metabolites only in LB. Strain C1 degraded vinclozolin, a structural analog of iprodione, and partially propanil, but not procymidone and phenylureas indicating a structure-dependent specificity related to the substituents of the carboxamide moiety.
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Affiliation(s)
- Marco Campos
- Centre of Environmental Biotechnology, BIOREN, Universidad de La Frontera, Temuco, Chile
- Department of Biochemistry and Biotechnology, University of Thessaly, 41221, Larissa, Greece
| | - Panagiotis S Karas
- Department of Biochemistry and Biotechnology, University of Thessaly, 41221, Larissa, Greece
| | - C Perruchon
- Department of Biochemistry and Biotechnology, University of Thessaly, 41221, Larissa, Greece
| | | | - Vasiliki Christou
- Department of Biochemistry and Biotechnology, University of Thessaly, 41221, Larissa, Greece
| | - Urania Menkissoglou-Spiroudi
- Faculty of Agriculture, Forestry and Natural Environment, School of Agriculture, Pesticide Science Laboratory, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Maria Christina Diez
- Centre of Environmental Biotechnology, BIOREN, Universidad de La Frontera, Temuco, Chile
- Chemical Engineering Department, Universidad de La Frontera, Temuco, Chile
| | - Dimitrios G Karpouzas
- Department of Biochemistry and Biotechnology, University of Thessaly, 41221, Larissa, Greece.
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9
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Kinetics of carbendazim degradation in a horizontal tubular biofilm reactor. Bioprocess Biosyst Eng 2016; 40:519-528. [DOI: 10.1007/s00449-016-1717-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 12/02/2016] [Indexed: 11/29/2022]
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Huang D, Wang Z, Zhang J, Feng J, Zheng Z, Zhang J. Gamma radiolytic degradation of 3,4-dichloroaniline in aqueous solution. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2016.06.052] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Marques R, Oehmen A, Carvalho G, Reis MAM. Modelling the biodegradation kinetics of the herbicide propanil and its metabolite 3,4-dichloroaniline. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:6687-6695. [PMID: 25422118 DOI: 10.1007/s11356-014-3870-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 11/16/2014] [Indexed: 06/04/2023]
Abstract
This study models the biodegradation kinetics of two toxic xenobiotic compounds in enriched mixed cultures: a commonly applied herbicide (3,4-dichloropropionanilide or propanil) and its metabolite (3,4-dichloroaniline or DCA). The dependence of the metabolite degradation kinetics on the presence of the parent compound was investigated, as well as the influence of the feeding operation strategy. Model equations were proposed incorporating substrate inhibition of the parent compound and the metabolite during dump feed operation of a sequencing batch reactor (SBR). The kinetic parameters of the biomass were compared to step feed degradation of the SBR. The relationship between propanil and DCA degradation rates with the concentration of each compound was studied. A statistical comparison was carried out between the model predictions and experimental results. Substrate inhibition by both propanil and DCA was prominent during dump feed operation but insignificant during step feed. With both feeding strategies, the metabolite degradation was found to be dependent on the concentration of both the parent compound and the metabolite, suggesting that the DCA degrading enzymatic activity was independent of the detachment of the propionate moiety from the propanil molecule. After incorporating this finding into the model equations, the model was able to describe well the propanil and DCA degradation profiles, with an r (2) correlation >0.95 for each case. A kinetic model was developed for the degradation of the herbicide propanil and its metabolite DCA. An exponential inhibition term was incorporated to describe the substrate inhibition during dump feeding. The kinetics of metabolite degradation was dependent of the sum of the concentrations of metabolite and parent compound, which could also be of relevance to future xenobiotic modelling applications from wastewater.
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Affiliation(s)
- Ricardo Marques
- REQUIMTE-CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
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13
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Wang Z, Yang Y, He T, Xie S. Change of microbial community structure and functional gene abundance in nonylphenol-degrading sediment. Appl Microbiol Biotechnol 2014; 99:3259-68. [DOI: 10.1007/s00253-014-6222-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 11/06/2014] [Accepted: 11/07/2014] [Indexed: 12/07/2022]
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14
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González Sánchez O, Araña J, González Díaz O, Herrera Melián J, Doña Rodríguez J, Pérez Peña J. Detoxification of the herbicide propanil by means of Fenton process and TiO2-photocatalysis. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.07.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Ordaz-Guillén Y, Galíndez-Mayer CJ, Ruiz-Ordaz N, Juárez-Ramírez C, Santoyo-Tepole F, Ramos-Monroy O. Evaluating the degradation of the herbicides picloram and 2,4-D in a compartmentalized reactive biobarrier with internal liquid recirculation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:8765-8773. [PMID: 24737019 DOI: 10.1007/s11356-014-2809-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Accepted: 03/17/2014] [Indexed: 06/03/2023]
Abstract
Tordon is a widely used herbicide formulation of 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-amino-3,5,6-trichloropicolinic acid (picloram), and it is considered a toxic herbicide. The purposes of this work were to assess the feasibility of a microbial consortium inoculated in a lab-scale compartmentalized biobarrier, to remove these herbicides, and isolate, identify, and evaluate their predominant microbial constituents. Volumetric loading rates of herbicides ranging from 31.2 to 143.9 g m(-3) day(-1), for 2,4-D, and 12.8 to 59.3 g m(-3) day(-1) for picloram were probed; however, the top operational limit of the biobarrier, detected by a decay in the removal efficiency, was not reached. At the highest loading rates probed, high average removal efficiencies of 2,4-D, 99.56 ± 0.44; picloram, 94.58 ± 2.62; and chemical oxygen demand (COD), 89.42 ± 3.68, were obtained. It was found that the lab-scale biofilm reactor efficiently removed both herbicides at dilution rates ranging from 0.92 to 4.23 day(-1), corresponding to hydraulic retention times from 1.087 to 0.236 days. On the other hand, few microbial strains able to degrade picloram are reported in the literature. In this work, three of the nine bacterial strains isolated cometabolically degrade picloram. They were identified as Hydrocarboniphaga sp., Tsukamurella sp., and Cupriavidus sp.
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Affiliation(s)
- Yolanda Ordaz-Guillén
- Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, IPN, Carpio y Plan de Ayala, Colonia Santo Tomás s/n, CP 11340, México, D.F., México
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