Database : MEDLINE
Search on : organophosphates [Words]
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[PMID]: 29522881
[Au] Autor:Sobjak TM; Romão S; Cazarolli LH; Sampaio SC; Remor MB; Guimarães ATB
[Ad] Address:Program in Conservation and Management of Natural Resources, Universidade Estadual do Oeste do Paraná, Rua Universitária, 2069, CEP 85819-110 Cascavel, Paraná, Brazil. Electronic address: thais.sobjak@hotmail.com.
[Ti] Title:Evaluation of the antioxidant system and neurotoxic effects observed in Rhamdia branneri (Teleostei: Heptapteridae) sampled from streams of the lower Iguazu River basin.
[So] Source:Ecotoxicol Environ Saf;155:162-170, 2018 Mar 06.
[Is] ISSN:1090-2414
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:The use of multiple biomarkers has been shown to be an efficient method for evaluating environmental contamination. In this work, we evaluate neurotoxic effects and the antioxidant system responses of the R. branneri collected in two streams of lower Iguazu River basin, relating them with different percentage of vegetation coverture, presence of pesticides and fall and winter seasons. The biological samples were collected in March and August of 2015, from two streams that belong to the lower Iguazu River basin (Brazil): the Manoel Gomes River and the Arquimedes Stream. Soil analyses were performed, and the results showed the presence of the following organophosphates in the Manoel Gomes River and the Arquimedes Stream: disulfoton, methyl parathion, and ronnel. The present study detected inhibition of cholinesterase activity in the brain and muscle of fish samples during the fall from the Manoel Gomes River and the Arquimedes Stream. In the Manoel Gomes River, elevated lipoperoxidation was also observed during the fall. It was observed that the increase or decrease of biomarkers was related to temporal variation and, possibly, to the exposure of animals to agrochemicals. Although the Manoel Gomes River and the Arquimedes Stream are located in regions with large areas of vegetation, the soil analyses show that agrochemical residues are able to reach these locations, which suggests that the fauna are in contact with oxidant and anti-cholinesterase agents during the fall, in addition to respond differently during each season.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[St] Status:Publisher

  2 / 6559 MEDLINE  
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[PMID]: 29175403
[Au] Autor:Liang Y; Liu X; Allen MR
[Ad] Address:Oak Ridge Institute for Science and Education Participant at U.S. Environmental Protection Agency, USA.
[Ti] Title:Measuring and modeling surface sorption dynamics of organophosphate flame retardants on impervious surfaces.
[So] Source:Chemosphere;193:754-762, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Understanding the sorption mechanisms for organophosphate flame retardants (OPFRs) on impervious surfaces is important to improve our knowledge of the fate and transport of OPFRs in indoor environments. The sorption processes of semivolatile organic compounds (SVOCs) on indoor surfaces are heterogeneous (multilayer sorption) or homogeneous (monolayer sorption). In this study, we adopted simplified Langmuir isotherm and Freundlich isotherm in a dynamic sink model to characterize the sorption dynamics of OPFRs on impervious surfaces such as stainless steel and made comparisons between the two models through a series of empty chamber studies. The tests involve two types of stainless steel chambers (53-L small chambers and 44-mL micro chambers) using tris(2-chloroethyl)phosphate (TCEP) and tris(1-chloro-2-propyl)phosphate (TCPP) as target compounds. Our test results show that the dynamic sink model using Freundlich isotherm can better represent the sorption process in the empty small chamber. Micro chamber test results from this study show that the sink model using both simplified Langmuir isotherm and Freundlich isotherm can well fit the measured gas-phase concentrations of OPFRs. We further applied both models and the parameters obtained to predict the gas phase concentrations of OPFRs in a small chamber with an emission source. Comparisons between model predictions and measurements demonstrate the reliability and applicability of the sorption parameters.
[Mh] MeSH terms primary: Adsorption
Flame Retardants/pharmacology
Models, Theoretical
Organophosphates/chemistry
[Mh] MeSH terms secundary: Organophosphates/pharmacology
Organophosphorus Compounds
Reproducibility of Results
Surface Properties
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Flame Retardants); 0 (Organophosphates); 0 (Organophosphorus Compounds); 0 (tris(1-chloro-2-propyl)phosphate); 32IVO568B0 (tris(chloroethyl)phosphate)
[Em] Entry month:1803
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[Js] Journal subset:IM
[Da] Date of entry for processing:171128
[St] Status:MEDLINE

  3 / 6559 MEDLINE  
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[PMID]: 29175399
[Au] Autor:Stubbings WA; Harrad S
[Ad] Address:School of Geography, Earth, & Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK. Electronic address: william.a.stubbings@gmail.com.
[Ti] Title:Leaching of TCIPP from furniture foam is rapid and substantial.
[So] Source:Chemosphere;193:720-725, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:A series of laboratory experiments were conducted, in which waste furniture polyurethane foam samples containing tris (1-chloro-2-propyl) phosphate (TCIPP) were contacted with a range of leaching fluids, formulated to simulate the composition of landfill leachate. Leaching was examined under a number of different scenarios, such as: dissolved humic matter concentration, pH, and temperature, as well as the effect of agitation, and waste:leaching fluid contact duration. In addition to single batch (no replenishment of leaching fluid), serial batch (draining of leachate and replenishment with fresh leaching fluid at various time intervals) experiments were conducted. Leaching of TCIPP from PUF appears to be a first order process. Concentrations of TCIPP in leachate generated by the experiments in this study ranged from 13 mg L to 130 mg L . In serial batch leaching experiments, >95% of TCIPP was depleted from PUF after 168 h total contact with leaching fluid. Our experiments indicate leaching is potentially a very significant pathway of TCIPP emissions to the environment.
[Mh] MeSH terms primary: Environmental Pollution
Flame Retardants/toxicity
Interior Design and Furnishings
Organophosphates/chemistry
Polyurethanes/toxicity
Water Pollutants, Chemical/chemistry
[Mh] MeSH terms secundary: Kinetics
Solubility
Solutions/chemistry
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Flame Retardants); 0 (Organophosphates); 0 (Polyurethanes); 0 (Solutions); 0 (Water Pollutants, Chemical); 9009-54-5 (polyurethane foam)
[Em] Entry month:1803
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[Js] Journal subset:IM
[Da] Date of entry for processing:171128
[St] Status:MEDLINE

  4 / 6559 MEDLINE  
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[PMID]: 28985534
[Au] Autor:Yadav IC; Devi NL; Li J; Zhang G
[Ad] Address:State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; Department of International Environmental and Agricultural Science (IEAS), Tokyo University of Agriculture and Technology (TUAT), 3-5-8, Saiwai-Cho, Fuchu-Shi,
[Ti] Title:Organophosphate ester flame retardants in Nepalese soil: Spatial distribution, source apportionment and air-soil exchange assessment.
[So] Source:Chemosphere;190:114-123, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Despite soil being the major terrestrial environmental reservoir and one of the significant sinks for many hydrophobic organic compounds including organophosphate ester flame retardants (OPFRs), limited information is available about concentration and fate of OPFRs contamination in urban soil in general and especially in case of Nepal. This study investigates the environmental concentration, spatial distribution and source apportionment of eight OPFRs in surface soil (n = 28) from four major cities of Nepal with special interest on air-soil exchange. Overall, significantly high concentrations of ∑ OPFR were measured in soil ranging from 25-27,900 ng/g dw (median 248 ng/g dw). In terms of compositional pattern, tris(methyl phenyl) phosphate (TMPP) was the most abundant phosphorus chemical in soil, followed by tris(2-chloroisopropyl) phosphate (TCIPP), and accounted for 35-49% and 8-25% of ∑ OPFRs, respectively. The high level of these OPFRs was attributed to local sources as opposed to transboundary influence from remote areas. A Spearman's rank correlation analysis exhibited weak correlation of ∑ OPFRs with TOC (Rho = 0.117, p < 0.05) and BC (Rho = 0.007, p < 0.05), suggesting little or no influence of TOC and BC on the concentration of ∑ OPFRs. The fugacity fraction (ff) results indicated a strong influence of soil contamination on atmospheric level of OPFRs via volatilization.
[Mh] MeSH terms primary: Flame Retardants/analysis
Organophosphates/analysis
Soil Pollutants/analysis
[Mh] MeSH terms secundary: Air Pollutants/analysis
Air Pollutants/chemistry
Air Pollution/analysis
Cities
Nepal
Soil/chemistry
Soil Pollutants/chemistry
Volatilization
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Air Pollutants); 0 (Flame Retardants); 0 (Organophosphates); 0 (Soil); 0 (Soil Pollutants)
[Em] Entry month:1803
[Cu] Class update date: 180308
[Lr] Last revision date:180308
[Js] Journal subset:IM
[Da] Date of entry for processing:171007
[St] Status:MEDLINE

  5 / 6559 MEDLINE  
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[PMID]: 28747242
[Au] Autor:Wang MM; Xing LY; Ni ZW; Wu G
[Ad] Address:Key Laboratory of Biopesticides and Chemical Biology (Ministry of Education), Fujian Agriculture and Forestry University,Fuzhou, Fujian 350002,China.
[Ti] Title:Identification and characterization of ace1-type acetylcholinesterase in insecticide-resistant and -susceptible Propylaea japonica (Thunberg).
[So] Source:Bull Entomol Res;108(2):253-262, 2018 Apr.
[Is] ISSN:1475-2670
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Characterization and gene cloning of acetylecholinesterase (AChE) in the insecticide-resistant (R) and -susceptible (S) insects have been reported in the past. However, the studies focused mostly on herbivorous pests, rather than predacious species, such as ladybird beetles. Using R and S Propylaea japonica (thunberg), a full-length cDNA sequence (2928 bp) of the ace1-type AChE gene was determined for the first time. The ace1 encoding a protein of 645 amino acids contained typical conserved motifs, such as FGESAG domains, catalytic triad, acyl pocket, oxyanino hole, choline binding site, peripheral anionic site, omega loop and conserved aromatic residues. R P. japonica displayed 50-times greater resistance to chlorpyrifos or mathamidophos with a significantly lower AChE sensitivity to paraoxon, malaoxon, chlorpyrifos or methamidophos than its S counterpart. Five amino acids in the ace1 of R P. japonica differed from those found in S P. japonica. One of them, F358S, located in the acyl-binding pocket, might play a crucial role in the resistance of the insect to organophosphates (OPs). Whereas, K493E and I538V, which were close to some of the conserved aromatic amino acids (i.e., H509, Y511, and W499) in the gorge, and G571R and T576A near C593 that formed the disulfide bonds with C471, might also involve in the change of insecticide resistance in P. japonica. AChE insensitivity and amino acid replacements, particularly F358S, might be the determining factors in the alteration of OPs-resistance in P. japonica.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1707
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[St] Status:In-Process
[do] DOI:10.1017/S0007485317000682

  6 / 6559 MEDLINE  
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[PMID]: 28471062
[Au] Autor:Rao AN; Patil A; Brodnik ZD; Qiang L; España RA; Sullivan KA; Black MM; Baas PW
[Ad] Address:Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania.
[Ti] Title:Pharmacologically increasing microtubule acetylation corrects stress-exacerbated effects of organophosphates on neurons.
[So] Source:Traffic;18(7):433-441, 2017 Jul.
[Is] ISSN:1600-0854
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Many veterans of the 1990-1991 Gulf War contracted Gulf War Illness (GWI), a multisymptom disease that primarily affects the nervous system. Here, we treated cultures of human or rat neurons with diisopropyl fluorophosphate (DFP), an analog of sarin, one of the organophosphate (OP) toxicants to which the military veterans were exposed. All observed cellular defects produced by DFP were exacerbated by pretreatment with corticosterone or cortisol, which, in rat and human neurons, respectively, serves in our experiments to mimic the physical stress endured by soldiers during the war. To best mimic the disease, DFP was used below the level needed to inhibit acetylcholinesterase. We observed a diminution in the ratio of acetylated to total tubulin that was correctable by treatment with tubacin, a drug that inhibits HDAC6, the tubulin deacetylase. The reduction in microtubule acetylation was coupled with deficits in microtubule dynamics, which were correctable by HDAC6 inhibition. Deficits in mitochondrial transport and dopamine release were also improved by tubacin. Thus, various negative effects of the toxicant/stress exposures were at least partially correctable by restoring microtubule acetylation to a more normal status. Such an approach may have therapeutic benefit for individuals suffering from GWI or other neurological disorders linked to OP exposure.
[Mh] MeSH terms primary: Anilides/pharmacology
Chemical Warfare Agents/toxicity
Hydroxamic Acids/pharmacology
Isoflurophate/toxicity
Microtubules/drug effects
Neurons/drug effects
Stress, Physiological
[Mh] MeSH terms secundary: Acetylation
Animals
Biological Transport
Cells, Cultured
Corticosterone/pharmacology
Dopamine/secretion
Dose-Response Relationship, Drug
Humans
Hydrocortisone/pharmacology
Microtubules/metabolism
Mitochondria/drug effects
Mitochondria/metabolism
Persian Gulf Syndrome
Rats
Tubulin/metabolism
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Anilides); 0 (Chemical Warfare Agents); 0 (Hydroxamic Acids); 0 (Tubulin); 02C2G1D30D (tubacin); 12UHW9R67N (Isoflurophate); VTD58H1Z2X (Dopamine); W980KJ009P (Corticosterone); WI4X0X7BPJ (Hydrocortisone)
[Em] Entry month:1803
[Cu] Class update date: 180308
[Lr] Last revision date:180308
[Js] Journal subset:IM
[Da] Date of entry for processing:170505
[St] Status:MEDLINE
[do] DOI:10.1111/tra.12489

  7 / 6559 MEDLINE  
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[PMID]: 29513982
[Au] Autor:Bigley AN; Narindoshvili T; Xiang DF; Raushel FM
[Ti] Title:Multiple Reaction Products from the Hydrolysis of Chiral and Prochiral Organophosphate Substrates by the Phosphotriesterase from Sphingobium sp. TCM1.
[So] Source:Biochemistry;, 2018 Mar 07.
[Is] ISSN:1520-4995
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:The phosphotriesterase from Sphingobium sp. TCM1 (Sb-PTE) is notable for its ability to hydrolyze organophosphates that are not substrates for other enzymes. In an attempt to determine the catalytic properties of Sb-PTE for hydrolysis of chiral phosphotriesters we discovered that multiple phosphodiester products are formed from a single substrate. For example, Sb-PTE catalyzes the hydrolysis of the (RP)-enantiomer of methyl cyclohexyl p-nitrophenyl phosphate with exclusive formation of methyl cyclohexyl phosphate. However, the enzyme catalyzes hydrolysis of the (SP)-enantiomer of this substrate to an equal mixture of methyl cyclohexyl phosphate and cyclohexyl p-nitrophenyl phosphate products. The ability of this enzyme to catalyze the hydrolysis of a methyl ester at the same rate as the hydrolysis of a p-nitrophenyl ester contained within the same substrate is remarkable. The overall scope of the stereoselective properties of this enzyme is addressed with a library of chiral and prochiral substrates.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180307
[Lr] Last revision date:180307
[St] Status:Publisher
[do] DOI:10.1021/acs.biochem.8b00145

  8 / 6559 MEDLINE  
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[PMID]: 29510177
[Au] Autor:Scholl EA; Miller-Smith SM; Bealer SL; Lehmkuhle MJ; Ekstrand JJ; Dudek FE; McDonough JH
[Ad] Address:Department of Neurosurgery, University of Utah, Salt Lake City, Utah, 84108 USA.
[Ti] Title:Age-Dependent Behaviors, Seizure Severity and Neuronal Damage in Response to Nerve Agents or the Organophosphate DFP in Immature and Adult Rats.
[So] Source:Neurotoxicology;, 2018 Mar 03.
[Is] ISSN:1872-9711
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:Exposure to nerve agents (NAs) and other organophosphates (OPs) can initiate seizures that rapidly progress to status epilepticus (SE). While the electrographic and neuropathological sequelae of SE evoked by NAs and OPs have been characterized in adult rodents, they have not been adequately investigated in immature animals. In this study postnatal day (PND) 14, 21 and 28 rat pups, along with PND70 animals as adult controls, were exposed to NAs (sarin, VX) or another OP (diisopropylfluorophosphate, DFP). We then evaluated behavioral and electrographic (EEG) correlates of seizure activity, and performed neuropathology using Fluoro-Jade B. Although all immature rats exhibited behaviors that are often characterized as seizures, the incidence, duration, and severity of the electrographic seizure activity were age-dependent. No (sarin and VX) or brief (DFP) EEG seizure activity was evoked in PND14 rats, while SE progressively increased in severity as a function of age in PND21, 28 and 70 animals. Fluoro-Jade B staining was observed in multiple brain regions of animals that exhibited prolonged seizure activity. Neuronal injury in PND14 animals treated with DFP was lower than in older animals and absent in rats exposed to sarin or VX. In conclusion, we found that NAs and an OP provoked robust SE and neuronal injury similar to adults in PND21 and PND28, but not in PND14, rat pups. Convulsive behaviors were often present independent of EEG seizures and were unaccompanied by neuronal damage. These differential responses should be considered when investigating medical countermeasures for NA and OP exposure in pediatric populations.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180306
[Lr] Last revision date:180306
[St] Status:Publisher

  9 / 6559 MEDLINE  
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[PMID]: 29499720
[Au] Autor:Zoh DD; Ahoua Alou LP; Toure M; Pennetier C; Camara S; Traore DF; Koffi AA; Adja AM; Yapi A; Chandre F
[Ad] Address:Institut Pierre Richet, 01 BP 1500, Bouaké, 01, Côte d'Ivoire. dounin1984@gmail.com.
[Ti] Title:The current insecticide resistance status of Anopheles gambiae (s.l.) (Culicidae) in rural and urban areas of Bouaké, Côte d'Ivoire.
[So] Source:Parasit Vectors;11(1):118, 2018 Mar 02.
[Is] ISSN:1756-3305
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:BACKGROUND: Several studies were carried out in experimental hut station in areas surrounding the city of Bouaké, after the crisis in Côte d'Ivoire. They reported increasing resistance levels to insecticide for malaria transmiting mosquitoes. The present work aims to evaluate the current resistance level of An. gambiae (s.l.) in rural and urban areas in the city of Bouaké. METHODS: Larvae of Anopheles gambiae (s.l.) were collected from five different study sites and reared to adult stages. The resistance status was assessed using the WHO bioassay test kits for adult mosquitoes, with eight insecticides belonging to pyrethroids, organochlorines, carbamates and organophosphates classes. Molecular assays were performed to identify the molecular forms of An. gambiae (s.l.), the L1014F kdr and the ace-1R alleles in individual mosquitoes. The synergist PBO was used to investigate the role of enzymes in resistance. Biochemical assays were performed to detect potential increased activities in mixed function oxidase (MFO) levels, non-specific esterases (NSE) and glutathione S-transferases (GST). RESULTS: High resistance levels to pyrethroids, organochlorines, and carbamates were observed in Anopheles gambiae (s.l.) from Bouaké. Mortalities ranged between 0 and 73% for the eight tested insecticides. The pre-exposure to PBO restored full or partial susceptibility to pyrethroids in the different sites. The same trend was observed with the carbamates in five sites, but to a lesser extent. With DDT, pre-exposure to PBO did not increase the mortality rate of An. gambiae (s.l.) from the same sites. Tolerance to organophosphates was observed. An increased activity of NSE and higher level of MFO were found compared to the Kisumu susceptible reference strain. Two molecular forms, S form [(An. gambiae (s.s)] and M form (An. coluzzi) were identified. The kdr allele frequencies vary from 85.9 to 99.8% for An. gambiae (s.s.) and from 81.7 to 99.6% for An. coluzzii. The ace-1R frequencies vary between 25.6 and 38.8% for An. gambiae (s.s.) and from 28.6 to 36.7% for An. coluzzii. CONCLUSION: Resistance to insecticides is widespread within both An. gambiae (s.s.) and An. coluzzii. Two mechanisms of resistance, i.e. metabolic and target-site mutation seemed to largely explain the high resistance level of mosquitoes in Bouaké. Pyrethroid resistance was found exclusively due to the metabolic mechanism.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180307
[Lr] Last revision date:180307
[St] Status:In-Data-Review
[do] DOI:10.1186/s13071-018-2702-2

  10 / 6559 MEDLINE  
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[PMID]: 29504744
[Au] Autor:Hondred JA; Breger J; Alves N; Trammell SA; Walper SA; Medintz IL; Claussen JC
[Ti] Title:Printed Graphene Electrochemical Biosensors Fabricated by Inkjet Maskless Lithography for Rapid and Sensitive Detection of Organophosphates.
[So] Source:ACS Appl Mater Interfaces;, 2018 Mar 05.
[Is] ISSN:1944-8252
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Solution phase printing of graphene-based electrodes has recently become an attractive low-cost, scalable manufacturing technique to create in-field electrochemical biosensors. Here we report a graphene-based electrode developed via Inkjet Maskless Lithography (IML) for the direct and rapid monitoring of triple-O linked phosphonate organophosphates (OPs); these constitute the active compounds found in chemical warfare agents and pesticides that exhibit acute toxicity as well as long-term pollution to soils and waterways. The IML printed graphene electrode is nano/microstructured with a 1000 mW benchtop laser engraver and electrochemically deposited platinum nanoparticles (dia. ~25 nm) to improve its electrical conductivity (sheet resistance decreased from ~10 000 Ω/sq. to 100 Ω/sq.), surface area, and electroactive nature for subsequent enzyme functionalization and biosensing. The enzyme phosphotriesterase (PTE), also known as organophosphate hydrolase (OPH), was conjugated to the electrode surface via glutaraldehyde cross-linking. The resulting biosensor was able to rapidly measure (5 sec response time) the insecticide paraoxon (a model organophosphate) with a low detection limit (3 nM), and high sensitivity (370 nA/µM) with negligible interference from similar nerve agents. Moreover, the biosensor exhibited high reusability (average of 0.3% decrease in sensitivity per sensing event), stability (90% anodic current signal retention over 1000 seconds), longevity (70% retained sensitivity after 8 weeks), and the ability to selectively sense OP in actual soil and water samples. Hence, this work presents a scalable printed graphene manufacturing technique that can be used to create OP biosensors that are suitable for in-field applications as well as, more generally, for low-cost biosensor test strips that could be incorporated into wearable or disposable sensing paradigms.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180305
[Lr] Last revision date:180305
[St] Status:Publisher
[do] DOI:10.1021/acsami.7b19763


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