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Valiauga B, Bagdžiūnas G, Sharrock AV, Ackerley DF, Čėnas N. The Catalysis Mechanism of E. coli Nitroreductase A, a Candidate for Gene-Directed Prodrug Therapy: Potentiometric and Substrate Specificity Studies. Int J Mol Sci 2024; 25:4413. [PMID: 38673999 PMCID: PMC11049802 DOI: 10.3390/ijms25084413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/05/2024] [Accepted: 04/10/2024] [Indexed: 04/28/2024] Open
Abstract
E. coli nitroreductase A (NfsA) is a candidate for gene-directed prodrug cancer therapy using bioreductively activated nitroaromatic compounds (ArNO2). In this work, we determined the standard redox potential of FMN of NfsA to be -215 ± 5 mV at pH 7.0. FMN semiquinone was not formed during 5-deazaflavin-sensitized NfsA photoreduction. This determines the two-electron character of the reduction of ArNO2 and quinones (Q). In parallel, we characterized the oxidant specificity of NfsA with an emphasis on its structure. Except for negative outliers nitracrine and SN-36506, the reactivity of ArNO2 increases with their electron affinity (single-electron reduction potential, E17) and is unaffected by their lipophilicity and Van der Waals volume up to 386 Å. The reactivity of quinoidal oxidants is not clearly dependent on E17, but 2-hydroxy-1,4-naphthoquinones were identified as positive outliers and a number of compounds with diverse structures as negative outliers. 2-Hydroxy-1,4-naphthoquinones are characterized by the most positive reaction activation entropy and the negative outlier tetramethyl-1,4-benzoquinone by the most negative. Computer modelling data showed that the formation of H bonds with Arg15, Arg133, and Ser40, plays a major role in the binding of oxidants to reduced NfsA, while the role of the π-π interaction of their aromatic structures is less significant. Typically, the calculated hydride-transfer distances during ArNO2 reduction are smallwer than for Q. This explains the lower reactivity of quinones. Another factor that slows down the reduction is the presence of positively charged aliphatic substituents.
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Affiliation(s)
- Benjaminas Valiauga
- Institute of Biochemistry of Life Sciences Center of Vilnius University, Saulėtekio 7, LT-10257 Vilnius, Lithuania; (B.V.); (G.B.)
| | - Gintautas Bagdžiūnas
- Institute of Biochemistry of Life Sciences Center of Vilnius University, Saulėtekio 7, LT-10257 Vilnius, Lithuania; (B.V.); (G.B.)
| | - Abigail V. Sharrock
- School of Biological Sciences, Victoria University of Wellington, Kelburn Parade, Wellington 6140, New Zealand; (A.V.S.); (D.F.A.)
| | - David F. Ackerley
- School of Biological Sciences, Victoria University of Wellington, Kelburn Parade, Wellington 6140, New Zealand; (A.V.S.); (D.F.A.)
| | - Narimantas Čėnas
- Institute of Biochemistry of Life Sciences Center of Vilnius University, Saulėtekio 7, LT-10257 Vilnius, Lithuania; (B.V.); (G.B.)
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Reddy Gajjala RK, Gade PS, Bhatt P, Vishwakarma N, Singh S. Enzyme decorated dendritic bimetallic nanocomposite biosensor for detection of HCHO. Talanta 2022; 238:123054. [PMID: 34801910 DOI: 10.1016/j.talanta.2021.123054] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 09/20/2021] [Accepted: 11/07/2021] [Indexed: 01/23/2023]
Abstract
In recent times, bi- and tri-metallic nanocomposites are being extensively studied to improve the catalytic surface and sensitivity of detection. In this study, we designed a formaldehyde dehydrogenase decorated Cys-AuPd-ErGO nanocomposite with fern like AuPd dendrites deposited on reduced graphene oxide (ErGO) on screen printed electrode (SPE) for determination of NADH and successfully demonstrated its application for detection of HCHO. This biosensor exhibited direct electron transfer by lowering the oxidation potential of NADH from +0.63 V to 0.32 V vs Ag/AgCl, avoiding usage of electron mediators. The sensor LOD was 0.3 μM HCHO with excellent sensitivity of 70 μA/μM/cm2 and linear detection range between 1 μM and 100 μM during chronoamperometric studies at applied over potential of +0.35 V vs Ag/AgCl. The sensor was tested for its performance in simulated HCHO adulterated samples of fish and milk, and appreciable recoveries (88-104%) at tested concentrations indicated good sensor performance. It was also validated against conventional method of HPLC with highly acceptable correlation coefficient of 0.99, indicating successful fabrication of a simple, "on site" disposable sensor for HCHO detection. The developed biosensor can also find wide application in quantitative measurement of NADH and analytes involved in reactions with the co-enzyme.
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Affiliation(s)
- Rajendra Kumar Reddy Gajjala
- Microbiology & Fermentation Technology Department, CSIR-Central Food Technological Research Institute (CFTRI), Mysuru, 570020, India
| | - Pravin Savata Gade
- Microbiology & Fermentation Technology Department, CSIR-Central Food Technological Research Institute (CFTRI), Mysuru, 570020, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP, 201002, India
| | - Praveena Bhatt
- Microbiology & Fermentation Technology Department, CSIR-Central Food Technological Research Institute (CFTRI), Mysuru, 570020, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP, 201002, India.
| | - Neelam Vishwakarma
- Agrionics- Post Harvest Technologies, CSIR- Central Scientific Instruments Organization (CSIO), Chandigarh, India, 160030; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP, 201002, India
| | - Suman Singh
- Agrionics- Post Harvest Technologies, CSIR- Central Scientific Instruments Organization (CSIO), Chandigarh, India, 160030; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP, 201002, India
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Wong HN, Padín-Irizarry V, van der Watt ME, Reader J, Liebenberg W, Wiesner L, Smith P, Eribez K, Winzeler EA, Kyle DE, Birkholtz LM, Coertzen D, Haynes RK. Optimal 10-Aminoartemisinins With Potent Transmission-Blocking Capabilities for New Artemisinin Combination Therapies-Activities Against Blood Stage P. falciparum Including PfKI3 C580Y Mutants and Liver Stage P. berghei Parasites. Front Chem 2020; 7:901. [PMID: 31998692 PMCID: PMC6967409 DOI: 10.3389/fchem.2019.00901] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Accepted: 12/13/2019] [Indexed: 12/31/2022] Open
Abstract
We have demonstrated previously that amino-artemisinins including artemiside and artemisone in which an amino group replaces the oxygen-bearing substituents attached to C-10 of the current clinical artemisinin derivatives dihydroartemisinin (DHA), artemether and artesunate, display potent activities in vitro against the asexual blood stages of Plasmodium falciparum (Pf). In particular, the compounds are active against late blood stage Pf gametocytes, and are strongly synergistic in combination with the redox active drug methylene blue. In order to fortify the eventual selection of optimum amino-artemisinins for development into new triple combination therapies also active against artemisinin-resistant Pf mutants, we have prepared new amino-artemisinins based on the easily accessible and inexpensive DHA-piperazine. The latter was converted into alkyl- and aryl sulfonamides, ureas and amides. These derivatives were screened together with the comparator drugs DHA and the hitherto most active amino-artemisinins artemiside and artemisone against asexual and sexual blood stages of Pf and liver stage P. berghei (Pb) sporozoites. Several of the new amino-artemisinins bearing aryl-urea and -amide groups are potently active against both asexual, and late blood stage gametocytes (IC50 0.4-1.0 nM). Although the activities are superior to those of artemiside (IC50 1.5 nM) and artemisone (IC50 42.4 nM), the latter are more active against the liver stage Pb sporozoites (IC50 artemisone 28 nM). In addition, early results indicate these compounds tend not to display reduced susceptibility against parasites bearing the Pf Kelch 13 propeller domain C580Y mutation characteristic of artemisinin-resistant Pf. Thus, the advent of the amino-artemisinins including artemiside and artemisone will enable the development of new combination therapies that by virtue of the amino-artemisinin component itself will possess intrinsic transmission-blocking capabilities and may be effective against artemisinin resistant falciparum malaria.
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Affiliation(s)
- Ho Ning Wong
- Centre of Excellence for Pharmaceutical Sciences, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Vivian Padín-Irizarry
- Center for Tropical & Emerging Global Diseases, Coverdell Center, University of Georgia, Athens, GA, United States
| | - Mariëtte E van der Watt
- Malaria Parasite Molecular Laboratory, Department of Biochemistry, Genetics and Microbiology, Institute for Sustainable Malaria Control, University of Pretoria, Pretoria, South Africa
| | - Janette Reader
- Malaria Parasite Molecular Laboratory, Department of Biochemistry, Genetics and Microbiology, Institute for Sustainable Malaria Control, University of Pretoria, Pretoria, South Africa
| | - Wilna Liebenberg
- Centre of Excellence for Pharmaceutical Sciences, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Lubbe Wiesner
- Division of Clinical Pharmacology, Department of Medicine, Groote Schuur Hospital, University of Cape Town, Cape Town, South Africa
| | - Peter Smith
- Division of Clinical Pharmacology, Department of Medicine, Groote Schuur Hospital, University of Cape Town, Cape Town, South Africa
| | - Korina Eribez
- School of Medicine, University of California, San Diego, La Jolla, CA, United States
| | - Elizabeth A Winzeler
- School of Medicine, University of California, San Diego, La Jolla, CA, United States
| | - Dennis E Kyle
- Center for Tropical & Emerging Global Diseases, Coverdell Center, University of Georgia, Athens, GA, United States
| | - Lyn-Marie Birkholtz
- Malaria Parasite Molecular Laboratory, Department of Biochemistry, Genetics and Microbiology, Institute for Sustainable Malaria Control, University of Pretoria, Pretoria, South Africa
| | - Dina Coertzen
- Malaria Parasite Molecular Laboratory, Department of Biochemistry, Genetics and Microbiology, Institute for Sustainable Malaria Control, University of Pretoria, Pretoria, South Africa
| | - Richard K Haynes
- Centre of Excellence for Pharmaceutical Sciences, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
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In Vitro Efficacies, ADME, and Pharmacokinetic Properties of Phenoxazine Derivatives Active against Mycobacterium tuberculosis. Antimicrob Agents Chemother 2019; 63:AAC.01010-19. [PMID: 31427302 DOI: 10.1128/aac.01010-19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 08/13/2019] [Indexed: 12/17/2022] Open
Abstract
Mycobacterium tuberculosis, the causative agent of tuberculosis, remains a leading infectious killer globally, demanding the urgent development of faster-acting drugs with novel mechanisms of action. Riminophenazines such as clofazimine are clinically efficacious against both drug-susceptible and drug-resistant strains of M. tuberculosis We determined the in vitro anti-M. tuberculosis activities, absorption, distribution, metabolism, and excretion properties, and in vivo mouse pharmacokinetics of a series of structurally related phenoxazines. One of these, PhX1, displayed promising drug-like properties and potent in vitro efficacy, supporting its further investigation in an M. tuberculosis-infected animal model.
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Del Pilar Anzola Rojas M, Zaiat M, Gonzalez ER, De Wever H, Pant D. Effect of the electric supply interruption on a microbial electrosynthesis system converting inorganic carbon into acetate. BIORESOURCE TECHNOLOGY 2018; 266:203-210. [PMID: 29982040 DOI: 10.1016/j.biortech.2018.06.074] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 06/08/2023]
Abstract
Microbial electrosynthesis (MES) technology relies on the direct use of electrons to convert CO2 into long chain organic chemicals. Therefore, MES has been proposed to be coupled to the renewable electricity supply, mainly from solar and wind sources. However, those energies suffer fluctuations and interruptions of variable duration, which can have an adverse effect on MES performance. Such effects on MES has been evaluated for the first time under different interruptions time. H-cell-MES reactors were disconnected from power supply during 4, 6, 8, 16, 32 and 64 h. Interruptions affected the acetate production rate, causing a decrease of until 77% after 64 h off. However, after all the interruptions, the acetate production was restored, taking between 7 and 16 h for the reduction current to turn steady. Therefore, microbial community on MES proved to be resilient and able to recover the electro-autotrophic activity despite the duration of current supply interruptions.
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Affiliation(s)
- Mélida Del Pilar Anzola Rojas
- Separation and Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium; São Carlos Institute of Chemistry, University of São Paulo (USP), Brazil
| | - Marcelo Zaiat
- Laboratory of Biological Processes, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering, University of São Paulo (USP), Brazil
| | | | - Heleen De Wever
- Separation and Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium
| | - Deepak Pant
- Separation and Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium.
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Titoiu AM, Lapauw M, Necula-Petrareanu G, Purcarea C, Fanjul-Bolado P, Marty JL, Vasilescu A. Carbon Nanofiber and Meldola Blue Based Electrochemical Sensor for NADH: Application to the Detection of Benzaldehyde. ELECTROANAL 2018. [DOI: 10.1002/elan.201800472] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Ana Maria Titoiu
- International Centre of Biodynamics; 1B Intrarea Portocalelor 060101 Bucharest Romania
| | - Maxime Lapauw
- Institut Universitaire de Technologie; University of Perpignan via Domitia; 77 Chemin de la Passio Vella Perpignan France
| | | | - Cristina Purcarea
- Institute of Biology; 296 Splaiul Independentei 060031 Bucharest Romania
| | - Pablo Fanjul-Bolado
- Metrohm Dropsens; S.L.,Ed.CEEI, Parque Tecnológico de Asturias; 33428- Llanera, Asturias Spain
| | - Jean-Louis Marty
- BAE; University of Perpignan via Domitia, France; 52 av Paul Alduy Perpignan France*
| | - Alina Vasilescu
- International Centre of Biodynamics; 1B Intrarea Portocalelor 060101 Bucharest Romania
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Ertek B, Dilgin Y. Photoamperometric flow injection analysis of glucose based on dehydrogenase modified quantum dots-carbon nanotube nanocomposite electrode. Bioelectrochemistry 2016; 112:138-44. [PMID: 26944347 DOI: 10.1016/j.bioelechem.2016.02.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 02/15/2016] [Accepted: 02/23/2016] [Indexed: 12/15/2022]
Abstract
In this work, a core-shell quantum dot (QD, ZnS-CdS) was electrodeposited onto multiwalled carbon nanotube modified glassy carbon electrode (ZnS-CdS/MWCNT/GCE) and following glucose dehydrogenase (GDH) was immobilized onto QD modified electrode. The proposed electrode (GDH/ZnS-CdS/MWCNT/GCE) was effectively used for the photoelectrochemical biosensing of glucose in flow injection analysis (FIA) system using a home-made flow cell. Results from cyclic voltammetric and FI amperometric measurements have revealed that GDH/ZnS-CdS/MWCNT/GCE is capable of signaling photoelectrocatalytic activity toward NADH when the surface of enzyme modified electrode was irradiated with a light source (250W Halogen lamp). Thus, photoelectrochemical biosensing of glucose was monitored by recording current-time curve of enzymatically produced NADH at optimized conditions. The biosensor response was found linear over the range 0.010-2.0mM glucose with detection limits of 6.0 and 4.0μM for amperometric and photoamperometric methods, respectively. The relative standard deviations (n=5) for 0.5mM glucose were 5.8% and 3.8% for photoamperometric and amperometric results, respectively. The photoelectrochemical biosensor was successfully applied to the real samples. The results with this biosensor showed good selectivity, repeatability and sensitivity for monitoring glucose in amperometric and photoamperometric FIA studies.
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Affiliation(s)
- Bensu Ertek
- Çanakkale Onsekiz Mart University, Science and Art Faculty, Department of Chemistry, 17020 Çanakkale, Turkey
| | - Yusuf Dilgin
- Çanakkale Onsekiz Mart University, Science and Art Faculty, Department of Chemistry, 17020 Çanakkale, Turkey.
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Ertek B, Akgül C, Dilgin Y. Photoelectrochemical glucose biosensor based on a dehydrogenase enzyme and NAD+/NADH redox couple using a quantum dot modified pencil graphite electrode. RSC Adv 2016. [DOI: 10.1039/c5ra25673a] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
A simple, disposable and economical modified electrode was prepared by electrodeposition of hybrid quantum dots onto a pencil graphite electrode surface and immobilization of glucose dehydrogenase onto the quantum dot modified electrode.
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Affiliation(s)
- Bensu Ertek
- Çanakkale Onsekiz Mart University
- Science and Art Faculty
- Department of Chemistry
- 17020 Çanakkale
- Turkey
| | - Cahit Akgül
- Çanakkale Onsekiz Mart University
- Science and Art Faculty
- Department of Chemistry
- 17020 Çanakkale
- Turkey
| | - Yusuf Dilgin
- Çanakkale Onsekiz Mart University
- Science and Art Faculty
- Department of Chemistry
- 17020 Çanakkale
- Turkey
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Kettisen K, Bülow L, Sakai H. Potential electron mediators to extract electron energies of RBC glycolysis for prolonged in vivo functional lifetime of hemoglobin vesicles. Bioconjug Chem 2015; 26:746-54. [PMID: 25734688 DOI: 10.1021/acs.bioconjchem.5b00076] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Developing a functional blood substitute as an alternative to donated blood for clinical use is believed to relieve present and future blood shortages, and to reduce the risks of infection and blood type mismatching. Hemoglobin vesicle (HbV) encapsulates a purified and concentrated human-derived Hb solution in a phospholipid vesicle (liposome). The in vivo safety and efficacy of HbV as a transfusion alternative have been clarified. Auto-oxidation of ferrous Hb in HbV gradually increases the level of ferric methemoglobin (metHb) and impairs the oxygen transport capabilities. The extension of the functional half-life of HbV has recently been proposed using an electron mediator, methylene blue (MB), which acts as a shuttle between red blood cells (RBC) and HbV. MB transfers electron energies of NAD(P)H, produced by RBC glycolysis, to metHb in HbV. Work presented here focuses on screening of 15 potential electron mediators, with appropriate redox potential and water solubility, for electron transfer from RBC to HbV. The results are assessed with regard to the chemical properties of the candidates. The compounds examined in this study were dimethyl methylene blue (DMB), methylene green, azure A, azure B, azure C, toluidine blue (TDB), thionin acetate, phenazine methosulfate, brilliant cresyl blue, cresyl violet, gallocyanine, toluylene blue, indigo carmine, indigotetrasulfonate, and MB. Six candidates were found to be unsuitable because of their insufficient diffusion across membranes, or overly high or nonexistent reactivity with relevant biomolecules. However, 9 displayed favorable metHb reduction. Among the suitable candidates, phenothiazines DMB and TDB exhibited effectiveness like MB did. In comparison to MB, they showed faster reduction by electron-donating NAD(P)H, coupled with showing a lower rate of reoxidation in the presence of molecular oxygen. Ascertaining the best electron mediator can provide a pathway for extending the lifetime and efficiency of potential blood substitutes.
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Affiliation(s)
- Karin Kettisen
- †Department of Chemistry, Nara Medical University, Kashihara 634-8521, Japan.,‡Department of Pure and Applied Biochemistry, Lund University, 221 00 Lund, Sweden
| | - Leif Bülow
- ‡Department of Pure and Applied Biochemistry, Lund University, 221 00 Lund, Sweden
| | - Hiromi Sakai
- †Department of Chemistry, Nara Medical University, Kashihara 634-8521, Japan
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Włodarczyk A, Stasiuk R, Skłodowska A, Matlakowska R. Extracellular compounds produced by bacterial consortium promoting elements mobilization from polymetallic Kupferschiefer black shale (Fore-Sudetic Monocline, Poland). CHEMOSPHERE 2015; 122:273-279. [PMID: 25522852 DOI: 10.1016/j.chemosphere.2014.11.073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Revised: 11/18/2014] [Accepted: 11/30/2014] [Indexed: 06/04/2023]
Abstract
Culture experiments employing Fe-deficient medium showed that a consortium of indigenous microorganisms isolated from Kupferschiefer black shale produced a mixture of extracellular compounds containing siderophores which could form complexes with a wide range of elements and were able to mediate element mobilization from polymetallic black shale. The mobilization of a diverse array of elements including a number of essential trace elements (Co, Cu, Mn, Mo, Zn) and toxic species (As) was shown. Since the bacteria used in this study were originally obtained from a subsurface copper deposit, these results highlight the potential importance of extracellular compounds in biogeochemical cycles of elements in underground environment and their ecological significance in promoting the uptake of essential trace metals and resistance to toxic elements.
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Affiliation(s)
- Agnieszka Włodarczyk
- Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Robert Stasiuk
- Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Aleksandra Skłodowska
- Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Renata Matlakowska
- Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland.
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Kochius S, Park JB, Ley C, Könst P, Hollmann F, Schrader J, Holtmann D. Electrochemical regeneration of oxidised nicotinamide cofactors in a scalable reactor. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcatb.2013.07.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Hartmann V, Kothe T, Pöller S, El-Mohsnawy E, Nowaczyk MM, Plumeré N, Schuhmann W, Rögner M. Redox hydrogels with adjusted redox potential for improved efficiency in Z-scheme inspired biophotovoltaic cells. Phys Chem Chem Phys 2014; 16:11936-41. [DOI: 10.1039/c4cp00380b] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nasri Z, Shams E, Ahmadi M. Direct Modification of a Glassy Carbon Electrode with Toluidine Blue Diazonium Salt: Application to NADH Determination and Biosensing of Ethanol. ELECTROANAL 2013. [DOI: 10.1002/elan.201300062] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Electrocatalytic oxidation of NADH using a pencil graphite electrode modified with quercetin. Colloids Surf B Biointerfaces 2012; 102:816-21. [PMID: 23107961 DOI: 10.1016/j.colsurfb.2012.09.030] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2012] [Revised: 09/12/2012] [Accepted: 09/17/2012] [Indexed: 11/23/2022]
Abstract
In the present study, the electrocatalytic oxidation of reduced β nicotinamide adenine dinucleotide (NADH) was investigated using a pencil graphite electrode modified with quercetin (PGE/QH(2)). The PGE/QH(2) was prepared through two steps: (i) the pre-treatment of PGE at 1.40 V vs. Ag|AgCl|KCl((sat.)) in pH 7.0 phosphate buffer containing 0.1 M KCl for 60s and (ii) adsorption of QH(2) on the PGE via immersion of PGE into a 1.0mM QH(2) solution (in ethanol) for 60s. Cyclic voltammetric studies show that the peak potential of NADH oxidation shifts from +500 mV at bare PGE to +300 mV at PGE/QH(2). The electrocatalytic currents obtained from amperometric measurements at +300 mV vs. Ag|AgCl|KCl((sat.)) and in phosphate buffer solution at pH 7.0 containing 0.1M KCl were linearly related to the concentration of NADH. Linear calibration plots are obtained in the concentration range from 0.5 μM to 100 μM. The limit of detection was found to be 0.15 μM.
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References. Anal Chem 2012. [DOI: 10.1201/b11478-14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Dilgin DG, Gligor D, Gökçel Hİ, Dursun Z, Dilgin Y. Glassy carbon electrode modified with poly-Neutral Red for photoelectrocatalytic oxidation of NADH. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0582-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Dilgin Y, Dilgin DG, Dursun Z, Gökçel Hİ, Gligor D, Bayrak B, Ertek B. Photoelectrocatalytic determination of NADH in a flow injection system with electropolymerized methylene blue. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2010.10.084] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Canevari TC, Vinhas RCG, Landers R, Gushikem Y. SiO2/SnO2/Sb2O5 microporous ceramic material for immobilization of Meldola's blue: application as an electrochemical sensor for NADH. Biosens Bioelectron 2010; 26:2402-6. [PMID: 21067911 DOI: 10.1016/j.bios.2010.10.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 10/06/2010] [Accepted: 10/11/2010] [Indexed: 10/18/2022]
Abstract
The mixed oxide SiO(2)/SnO(2), containing 25 wt% of SnO(2), determined by X-ray fluorescence, was prepared by the sol-gel method and the porous matrix obtained was then grafted with Sb (V), resulting the solid designated as (SiSnSb). XPS indicated 0.7% of Sb atoms on the surface. Sb grafted on the surface contains Brønsted acid centers (SbOH groups) that can immobilize Meldola's blue (MB(+)) cationic dye onto the surface by an ion exchange reaction, resulting the solid designated as (SiSnSb/MB). In the present case a surface concentration of MB(+)=2.5×10(-11) mol cm(2) on the surface was obtained. A homogeneous mixture of the SiSnSb/MB with ultra pure graphite (99.99%) was pressed in disk format and used to fabricate a working electrode that displayed an excellent specific electrocatalytic response to NADH oxidation, with a formal potential of -0.05 V at pH 7.3. The electrochemical properties of the resulting electrode were investigated thoroughly with cyclic voltammetric and chronoamperometry techniques. The proposed sensor showed a good linear response range for NADH concentrations between 8×10(-5) and 9.0×10(-4) mol L(-1), with a detection limit of 1.5×10(-7) mol L(-1). The presence of dopamine and ascorbic acid did not show any interference in the detection of NADH on this modified electrode surface.
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Affiliation(s)
- Thiago C Canevari
- Institute of Chemistry, State University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP, Brazil
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19
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Development of a sensitive and selective Riboflavin sensor based on carbon ionic liquid electrode. Anal Chim Acta 2010; 674:176-81. [DOI: 10.1016/j.aca.2010.06.012] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Revised: 06/04/2010] [Accepted: 06/09/2010] [Indexed: 11/22/2022]
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20
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Bardhan M, Mandal P, Tzeng WB, Ganguly T. Investigations on the Photoreactions of Phenothiazine and Phenoxazine in Presence of 9-cyanoanthracene by Using Steady State and Time Resolved Spectroscopic Techniques. J Fluoresc 2010; 20:1061-8. [DOI: 10.1007/s10895-010-0658-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2010] [Accepted: 03/26/2010] [Indexed: 10/19/2022]
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21
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Safavi A, Moradlou O, Saadatifar M. Methylated Azopyridine as a New Electron Transfer Mediator for the Electrocatalytic Oxidation of NADH. ELECTROANAL 2010. [DOI: 10.1002/elan.200900487] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Gligor D, Craciunescu I, Popescu I, Gorton L. Influence of the Electrode Material on the Electrochemical Behavior of Carbon Paste Electrodes Modified with Meldola Blue and Methylene Green Adsorbed on a Synthetic Zeolite. ELECTROANAL 2010. [DOI: 10.1002/elan.200900408] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Torres CI, Marcus AK, Lee HS, Parameswaran P, Krajmalnik-Brown R, Rittmann BE. A kinetic perspective on extracellular electron transfer by anode-respiring bacteria. FEMS Microbiol Rev 2010; 34:3-17. [DOI: 10.1111/j.1574-6976.2009.00191.x] [Citation(s) in RCA: 446] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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24
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Kornberger P, Gajdzik J, Natter H, Wenz G, Giffhorn F, Kohring GW, Hempelmann R. Modification of galactitol dehydrogenase from Rhodobacter sphaeroides D for immobilization on polycrystalline gold surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:12380-12386. [PMID: 19778027 DOI: 10.1021/la9010168] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Galactitol dehydrogenase (GatDH) from Rhodobacter sphaeroides is a multifunctional enzyme that catalyzes in the presence of oxidized beta-nicotinamide adenine dinucleotide (NAD(+)) the interconversion of various multivalent aliphatic alcohols to the corresponding ketones. The recombinant GatDH was provided with an N-terminal His(6)-tag to which distally up to three cysteine residues were attached. This protein construct maintained nearly full enzymatic activity, and it could be covalently immobilized via thiol bonds onto the surface of a gold electrode. Binding of GatDH onto the gold electrode was verified by SPR measurements, and residual enzyme activity was measured by cyclic voltammetry using 1,2-hexanediol as substrate, the cofactor NAD(+) and the redox mediator CTFM (4-carboxy-2,5,7-trinitrofluorenyliden-malonnitrile) in solute form. The results demonstrate the possibility of a directed functional immobilization of proteins on gold surfaces, which represents a proof-of-concept for the development of reactors for electrochemical synthon preparation using dehydrogenases.
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Affiliation(s)
- P Kornberger
- Applied Microbiology, Campus A1.5., Saarland University, D-66123 Saarbruecken, Germany
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25
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Lei C, Hu D, Ackerman E. Clay nanoparticle-supported single-molecule fluorescence spectroelectrochemistry. NANO LETTERS 2009; 9:655-658. [PMID: 19140768 DOI: 10.1021/nl802998e] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Here we report that clay nanoparticles allow formation of a modified transparent electrode, spontaneous adsorption of fluorescent redox molecules on the clay layer, and thus the subsequent observation of single-molecule fluorescence spectroelectrochemistry. We can trace single-molecule fluorescence spectroelectrochemistry by probing the fluorescence intensity change of individually immobilized single redox molecules modulated via cyclic voltammetric potential scanning. This work opens a new approach to explore interfacial electron transfer mechanisms of redox reactions.
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Affiliation(s)
- Chenghong Lei
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
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26
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Gligor D, Dilgin Y, Popescu I, Gorton L. Photoelectrocatalytic Oxidation of NADH at a Graphite Electrode Modified with a New Polymeric Phenothiazine. ELECTROANAL 2009. [DOI: 10.1002/elan.200804397] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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Dopamine sensitized nanoporous TiO2 film on electrodes: photoelectrochemical sensing of NADH under visible irradiation. Biosens Bioelectron 2008; 24:2494-8. [PMID: 19185483 DOI: 10.1016/j.bios.2008.12.031] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2008] [Revised: 12/10/2008] [Accepted: 12/22/2008] [Indexed: 11/21/2022]
Abstract
Dopamine-coordinated photoactive TiO(2) nanoporous films with a wide excitation range of light in the visible region (up to 580 nm) were prepared and used for sensitive detection of NADH. Colloidal TiO(2) was firstly covered on an indium-tin oxide (ITO) electrode surface and sintered at 450 degrees C to form a nanoporous TiO(2) film, then the electrode was dipped in a dopamine solution to form a dopamine-TiO(2) charge transfer complex via coordinating dopamine with undercoordinated titanium atoms on the electrode surface. This charge transfer complex provided an anodic photocurrent under visible light and the photocurrent could be largely enhanced by NADH. The photocurrent enhancement might be due to the electron transfer between NADH and the holes localized on dopamine. A new photoelectrochemical methodology for sensitive detection of NADH at a relatively low potential was developed. The detection limit of NADH was 1.4x10(-7) M, and the detection range could extend up to 1.2x10(-4) M. The dopamine-TiO(2) modified electrode exhibits its major advantages such as effective electronic transducer, fast response and easy fabrication for photoelectrochemical determination of NADH. This strategy largely reduces the destructive effect of UV light and the photogenerated holes of illuminated TiO(2) to biomolecules and opens a new avenue for the applications of TiO(2) in photoelectrochemical biosensing.
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Shervedani RK, Bagherzadeh M. Hydroxamation of gold surface via in-situ layer-by-layer functionalization of cysteamine self-assembled monolayer: Preparation and electrochemical characterization. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.04.051] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Lima PR, Santos WDJR, de Oliveira AB, Goulart MOF, Kubota LT. Electrochemical investigations of the reaction mechanism and kinetics between NADH and redox-active (NC)2C6H3-NHOH/(NC)2C6H3-NO from 4-nitrophthalonitrile-(NC)2C6H3-NO2-modified electrode. Biosens Bioelectron 2008; 24:448-54. [PMID: 18562191 DOI: 10.1016/j.bios.2008.04.023] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2008] [Revised: 04/10/2008] [Accepted: 04/29/2008] [Indexed: 11/19/2022]
Abstract
A simple and sensitive method for the electrocatalytic detection of NADH on a carbon paste electrode modified with a redox-active (NC)(2)C(6)H(3)-NO/(NC)(2)C(6)H(3)-NHOH (NOPH/NHOHPH) electrogenerated in situ from 4-nitrophthalonitrile (4-NPHN) is presented. The electrode modified with 4-NPHN showed an efficient electrocatalytic activity towards the oxidation of NADH with activation overpotential of 0.12V vs. Ag/AgCl. The formation of an intermediate charge transfer complex is proposed for the charge transfer reaction between NADH and the 4-NPHN-resulting system. The second-order rate constant for electrocatalytic oxidation of NADH, kappa(obs), and the apparent Michaelis-Menten constant K(M), at pH 7.0 were evaluated with rotating disk electrode (RDE) experiments, giving 1.0 x 10(4)mol(-1)Ls(-1) and 2.7 x 10(-5)mol L(-1), respectively. Employing the Koutecky-Levich approach indicated that the NADH oxidation reaction involves two electrons. The sensor provided a linear response range for NADH from 0.8 up to 8.5 micromol L(-1) with sensitivity, detection, quantification limits and time response of 0.50 microA L micromol(-1), 0.25micromol L(-1), 0.82 micromol L(-1) and 0.1s, respectively. The repeatability of the measurements with the same sensor and different sensors, evaluated in terms of relative standard deviation, were 4.1 and 5.0%, respectively, for n=10.
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30
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Lei C, Hu D, Ackerman EJ. Single-molecule fluorescence spectroelectrochemistry of cresyl violet. Chem Commun (Camb) 2008:5490-2. [DOI: 10.1039/b812161c] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Sohrabnezhad S, Pourahmad A. New Methylene Blue (NMB) Encapsulated in Mesoporous AlMCM-41 Material and Its Application for Amperometric Determination of Ascorbic Acid in Real Samples. ELECTROANAL 2007. [DOI: 10.1002/elan.200703898] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Zanjanch MA, Sohrabnezhad S, Arvand M, Mousavi MF. Electrochemical study of the thionine dye incorporated into ZSM-5 and HZSM-5 zeolites. RUSS J ELECTROCHEM+ 2007. [DOI: 10.1134/s1023193507070038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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Characterisation of poly(neutral red) modified carbon film electrodes; application as a redox mediator for biosensors. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0281-9] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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34
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Radoi A, Compagnone D, Batic M, Klincar J, Gorton L, Palleschi G. NADH screen-printed electrodes modified with zirconium phosphate, Meldola blue, and Reinecke salt. Application to the detection of glycerol by FIA. Anal Bioanal Chem 2007; 387:1049-58. [PMID: 17203252 DOI: 10.1007/s00216-006-0975-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2006] [Revised: 10/27/2006] [Accepted: 10/30/2006] [Indexed: 11/24/2022]
Abstract
Bulk screen-printed electrodes (bSPEs) modified with zirconium phosphate (ZrP) and Meldola blue (MB) and by electrochemical deposition of a Reineckate film (bMBZrPRs-SPEs) have been constructed and used as NADH sensors. Cyclic voltammetric investigation of these bulk electrochemically modified screen-printed electrodes revealed stable catalytic activity in oxidation of the reduced form of the coenzyme nicotinamide adenine dinucleotide (NADH). Flow-injection analysis (FIA) coupled with amperometric detection confirmed the improved stability of the bMBZrPRs-SPEs (10(-4) mol L(-1) NADH, %RSD = 4.2, n = 90, pH 7.0). Other conditions, for example applied working potential (+50 mV relative to Ag|AgCl), flow rate (0.30 mL min(-1)) and pH-dependence (range 4.0-10.0) were evaluated and optimized. A glycerol biosensor, prepared by immobilizing glycerol dehydrogenase (GDH) on the working electrode area of a bMBZrPRs-SPE, was also assembled. The biosensor was most stable at pH 8.5 (%RSD = 5.6, n = 70, 0.25 mmol L(-1) glycerol). The detection and quantification limits were 2.8 x 10(-6) and 9.4 x 10(-6) mol L(-1), respectively, and the linear working range was between 1.0 x 10(-5) and 1.0 x 10(-4) mol L(-1). To assess the effect of interferences, and recovery by the probe we analyzed samples taken during fermentation of chemically defined grape juice medium and compared the results with those obtained by HPLC.
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Affiliation(s)
- A Radoi
- Dipartimento di Scienze e Tecnologie Chimiche, Università Tor Vergata, via della Ricerca Scientifica 1, 00133, Rome, Italy
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35
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Santiago MB, Vélez MM, Borrero S, Díaz A, Casillas CA, Hofmann C, Guadalupe AR, Colón JL. NADH Electrooxidation Using Bis(1,10-phenanthroline-5,6-dione) (2,2'-bipyridine)ruthenium(II)-Exchanged Zirconium Phosphate Modified Carbon Paste Electrodes. ELECTROANAL 2006; 18:559-572. [PMID: 18516242 PMCID: PMC2398768 DOI: 10.1002/elan.200503432] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We present a carbon paste electrode (CPE) modified using the electron mediator bis(1,10-phenanthroline-5,6-dione) (2,2'-bipyridine)ruthenium(II) ([Ru(phend)(2)bpy](2+)) exchanged into the inorganic layered material zirconium phosphate (ZrP). X-Ray powder diffraction showed that the interlayer distance of ZrP increases upon [Ru(phend)(2)bpy](2+) intercalation from 10.3 Å to 14.2 Å. The UV-vis and IR spectroscopies results showed the characteristic peaks expected for [Ru(phend)(2)bpy](2+). The UV-vis spectrophotometric results indicate that the [Ru(phend)(2)bpy](2+) concentration inside the ZrP layers increased as a function of the loading level. The exchanged [Ru(phend)(2)bpy](2+) exhibited luminescence even at low concentration. Modified CPEs were constructed and analyzed using cyclic voltammetry. The intercalated mediator remained electroactive within the layers (E°' = -38.5 mV vs. Ag/AgCl, 3.5 M NaCl) and electrocatalysis of NADH oxidation was observed. The kinetics of the modified CPE shows a Michaelis -Menten behavior. This CPE was used for the oxidation of NADH in the presence of Bakers' yeast alcohol dehydrogenase. A calibration plot for ethanol is presented.
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Affiliation(s)
- Mitk’El B. Santiago
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
| | - Meredith M. Vélez
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
| | - Solmarie Borrero
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
| | - Agustín Díaz
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
| | - Craig A. Casillas
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
| | - Cristina Hofmann
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
| | - Ana R. Guadalupe
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
| | - Jorge L. Colón
- Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA
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36
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Dilgin Y, Dursun Z, Nisli G, Gorton L. Photoelectrochemical investigation of methylene blue immobilised on zirconium phosphate modified carbon paste electrode in flow injection system. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.04.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Ladiu CI, Popescu IC, Gorton L. Electrocatalytic oxidation of NADH at carbon paste electrodes modified with meldola blue adsorbed on zirconium phosphate: effect of Ca2+ and polyethyleneimine. J Solid State Electrochem 2005. [DOI: 10.1007/s10008-004-0618-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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38
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Lazarin AM, Airoldi C. Intercalation of methylene blue into barium phosphate—synthesis and electrochemical investigation. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2004.05.063] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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39
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Munteanu F, Mano N, Kuhn A, Gorton L. NADH electrooxidation using carbon paste electrodes modified with nitro-fluorenone derivatives immobilized on zirconium phosphate. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2003.10.034] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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40
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Pereira AC, Santos ADS, Kubota LT. o-Phenylenediamine adsorbed onto silica gel modified with niobium oxide for electrocatalytic NADH oxidation. Electrochim Acta 2003. [DOI: 10.1016/s0013-4686(03)00476-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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41
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Pereira AC, Santos ADS, Kubota LT. Electrochemical behavior of riboflavin immobilized on different matrices. J Colloid Interface Sci 2003; 265:351-8. [PMID: 12962669 DOI: 10.1016/s0021-9797(03)00477-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The electrochemical behavior of riboflavin (RF) adsorbed on different surfaces of inorganic matrices was investigated using modified carbon paste electrodes. Silica gel and sol-gel silica modified with niobium oxide were denominated as (SN) and (SN(sol-gel)), respectively. These materials were treated with a H3PO4 solution to graft phosphate groups and were denominated as (SNP) and (SNP(sol-gel)). The immobilization of RF on these materials indicated a high electrode stability, avoiding leaching out of the electroactive species (RF) from the electrode surface. The values of formal potential (E0') of the adsorbed RF on the different matrices changed from -283 (SNRF) up to -165 mV (SNPRF(sol-gel)) vs SCE in 0.1 moll(-1) NaNO3 solution at pH 7.0. Compared to the E0' for soluble RF, the values are shifted 183 up to 305 mV toward more positive potentials. The stability of the electrodes and the formal potential of the adsorbed RF on different matrices remained constant upon changing the solution pH from 3 to 8. Some kinetic parameters were estimated; indicating that all systems studied presented a good electron transfer rate.
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Affiliation(s)
- Arnaldo C Pereira
- Institute of Chemistry, Unicamp, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
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42
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Munteanu FD, Dicu D, Popescu I, Gorton L. NADH Oxidation Using Carbonaceous Electrodes Modified with Dibenzo-Dithia-Diazapentacene. ELECTROANAL 2003. [DOI: 10.1002/elan.200390044] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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43
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Dicu D, Munteanu FD, Catalin Popescu I, Gorton L. Indophenol andO-Quinone Derivatives Immobilized on Zirconium Phosphate for NADH Electro-oxidation. ANAL LETT 2003. [DOI: 10.1081/al-120023613] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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44
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Electrochemical and catalytic investigation of carbon paste modified with Toluidine Blue O covalently immobilised on silica gel. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(02)01359-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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45
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Liu HH, Lu JL, Zhang M, Pang DW. Electrochemical properties of Nile Blue covalently immobilized on self-assembled thiol-monolayer modified gold electrodes. ANAL SCI 2002; 18:1339-44. [PMID: 12502086 DOI: 10.2116/analsci.18.1339] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A monolayer of Nile Blue (NB) has been covalently immobilized on the self-assembled thiol-monolayer modified gold electrode. Cyclic voltammograms indicated a stable and reverse redox process of NB bonded on the electrode surface. The mechanisms of redox process coupling with proton transfer were proposed. The NB-modified electrode showed excellent electrocatalytic activity toward Nicotinamide adenine dinucleotide (NADH) oxidation and horseradish peroxidase (HRP) reduction. A hydrogen peroxide biosensor based on NB as a mediator has been demonstrated.
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Affiliation(s)
- Hui-Hong Liu
- Department of Chemistry, Wuhan University, Wuhan 430072, China
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46
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Santos ADS, Gorton L, Kubota LT. Nile blue adsorbed onto silica gel modified with niobium oxide for electrocatalytic oxidation of NADH. Electrochim Acta 2002. [DOI: 10.1016/s0013-4686(02)00272-4] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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47
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Munteanu FD, Mano N, Kuhn A, Gorton L. Mediator-modified electrodes for catalytic NADH oxidation: high rate constants at interesting overpotentials. Bioelectrochemistry 2002; 56:67-72. [PMID: 12009446 DOI: 10.1016/s1567-5394(02)00009-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Carbon paste electrodes were modified with a nitrofluorenone derivative, 2,4,7-trinitro-9-fluorenone, adsorbed on zirconium phosphate (ZP). After electrochemical reduction of the fluorenone derivative, it turns into a very efficient mediator for electrocatalytic NADH oxidation, with a formal potential of about +250 mV vs. Ag/AgCl. The electrochemistry and the electrocatalytic properties of the mediator were investigated with cyclic voltammetry and rotating disk electrode methodology. The second order rate constant with NADH was evaluated and found to be higher than 10(6) M(-1) s(-1), thus approaching true diffusion controlled currents for NADH oxidation.
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Affiliation(s)
- F D Munteanu
- Department of Analytical Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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48
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Wang P, Yuan Y, Zhu G. Carbon ceramic electrodes modified with sub-micron particles of new methylene blue (NMB) intercalated α-zirconium phosphate. J Electroanal Chem (Lausanne) 2002. [DOI: 10.1016/s0022-0728(01)00736-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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49
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Zaitseva G, Gushikem Y, Ribeiro ES, Rosatto SS. Electrochemical property of methylene blue redox dye immobilized on porous silica–zirconia–antimonia mixed oxide. Electrochim Acta 2002. [DOI: 10.1016/s0013-4686(01)00870-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Liu SQ, Chen Y, Chen HY. Electrochemical Studies on a Zirconium Hexacyanoferrate Modified Electrode and Utility for the Determination of Rubidium. ELECTROANAL 2002. [DOI: 10.1002/1521-4109(200201)14:2<116::aid-elan116>3.0.co;2-q] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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