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Electrochemical Characterization of the Antioxidant Properties of Medicinal Plants and Products: A Review. Molecules 2023; 28:molecules28052308. [PMID: 36903553 PMCID: PMC10004803 DOI: 10.3390/molecules28052308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/19/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
Medicinal plants are an important source of bioactive compounds with a wide spectrum of practically useful properties. Various types of antioxidants synthesized in plants are the reasons for their application in medicine, phytotherapy, and aromatherapy. Therefore, reliable, simple, cost-effective, eco-friendly, and rapid methods for the evaluation of antioxidant properties of medicinal plants and products on their basis are required. Electrochemical methods based on electron transfer reactions are promising tools to solve this problem. Total antioxidant parameters and individual antioxidant quantification can be achieved using suitable electrochemical techniques. The analytical capabilities of constant-current coulometry, potentiometry, various types of voltammetry, and chrono methods in the evaluation of total antioxidant parameters of medicinal plants and plant-derived products are presented. The advantages and limitations of methods in comparison to each other and traditional spectroscopic methods are discussed. The possibility to use electrochemical detection of the antioxidants via reactions with oxidants or radicals (N- and O-centered) in solution, with stable radicals immobilized on the electrode surface, via oxidation of antioxidants on a suitable electrode, allows the study of various mechanisms of antioxidant actions occurring in living systems. Attention is also paid to the individual or simultaneous electrochemical determination of antioxidants in medicinal plants using chemically modified electrodes.
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Muthukutty B, Ganesamurthi J, Chen TW, Chen SM, Yu J, Liu X. A novel high-performance electrocatalytic determination platform for voltammetric sensing of eugenol in acidic media using pyrochlore structured lanthanum stannate nanoparticles. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.10.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Electrochemical Sensors Based on the Electropolymerized Natural Phenolic Antioxidants and Their Analytical Application. SENSORS 2021; 21:s21248385. [PMID: 34960482 PMCID: PMC8707084 DOI: 10.3390/s21248385] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/08/2021] [Accepted: 12/12/2021] [Indexed: 11/17/2022]
Abstract
The design and fabrication of novel electrochemical sensors with high analytical and operational characteristics are one of the sustainable trends in modern analytical chemistry. Polymeric film formation by the electropolymerization of suitable monomers is one of the methods of sensors fabrication. Among a wide range of the substances able to polymerize, the phenolic ones are of theoretical and practical interest. The attention is focused on the sensors based on the electropolymerized natural phenolic antioxidants and their analytical application. The typical electropolymerization reaction schemes are discussed. Phenol electropolymerization leads to insulating coverage formation. Therefore, a combination of electropolymerized natural phenolic antioxidants and carbon nanomaterials as modifiers is of special interest. Carbon nanomaterials provide conductivity and a high working surface area of the electrode, while the polymeric film properties affect the selectivity and sensitivity of the sensor response for the target analyte or the group of structurally related compounds. The possibility of guided changes in the electrochemical response for the improvement of target compounds' analytical characteristics has appeared. The analytical capabilities of sensors based on electropolymerized natural phenolic antioxidants and their future development in this field are discussed.
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Gonzalez A, Miñán AG, Grillo CA, Prieto ED, Schilardi PL, Fernández Lorenzo de Mele MA. Characterization and antimicrobial effect of a bioinspired thymol coating formed on titanium surface by one-step immersion treatment. Dent Mater 2020; 36:1495-1507. [PMID: 32988646 DOI: 10.1016/j.dental.2020.09.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 06/03/2020] [Accepted: 09/04/2020] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To develop an antimicrobial and anti-adherent thymol (TOH)-containing coating on titanium (Ti) by a bioinspired one-step biocompatible method. METHODS A nanolayer of adsorbed TOH (TOH-NL-Ti) was formed by an easy deep coating method on Ti surface. The treatment consists in a simple one-step immersion process in a TOH-containing solution. Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR-FTIR), potentiodynamic electrochemical technique, open circuit potential records, Atomic Force Microscopy (AFM) and measurements of TOH release were used to characterize TOH-NL-Ti. Live/Dead staining and plate counting were employed to quantify attached and living adhered bacteria, respectively. Biocompatibility and cytotoxicity in fibroblastic and pre-osteoblastic cell lines were evaluated by acridine orange staining and MTT assay, respectively. RESULTS TOH adsorbed on TOH-NL-Ti was detected by ATR-FTIR and electrochemical techniques. ATR-FTIR results showed that TOH nanofilms development involves spontaneous production of ketonic structures on Ti surface. AFM analysis revealed that the thickness of the TOH-NL was below 80 nm. Finally, microbiological assays confirmed that TOH-NL-Ti can inhibit the adhesion and kill attached bacteria leading to the eradication of leaving cells on its surface. After 24 h of biocidal release, the antimicrobial effect is also significant (a decrease of 3 orders in the number of attached bacteria). SIGNIFICANCE The formation of TOH-NL-Ti nanolayer is a simple strategy able to be applied by not specially trained personnel, to reduce implant infection risks, ensure highly effective antimicrobial action and inhibition of bacterial adhesion on Ti surfaces without showing toxic effects for pre-osteoblastic and fibroblastic cells.
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Affiliation(s)
- Ariel Gonzalez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas, Universidad Nacional de La Plata- CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina.
| | - Alejandro Guillermo Miñán
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas, Universidad Nacional de La Plata- CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina.
| | - Claudia Alejandra Grillo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas, Universidad Nacional de La Plata- CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina.
| | - Eduardo Daniel Prieto
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas, Universidad Nacional de La Plata- CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina.
| | - Patricia Laura Schilardi
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas, Universidad Nacional de La Plata- CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina.
| | - Mónica Alicia Fernández Lorenzo de Mele
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas, Universidad Nacional de La Plata- CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina; Facultad de Ingeniería, Universidad Nacional de La Plata, Calle 47 y 1, 1900 La Plata, Argentina.
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Li R, Qi H, Ma Y, Deng Y, Liu S, Jie Y, Jing J, He J, Zhang X, Wheatley L, Huang C, Sheng X, Zhang M, Yin L. A flexible and physically transient electrochemical sensor for real-time wireless nitric oxide monitoring. Nat Commun 2020; 11:3207. [PMID: 32587309 PMCID: PMC7316789 DOI: 10.1038/s41467-020-17008-8] [Citation(s) in RCA: 95] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 06/08/2020] [Indexed: 12/31/2022] Open
Abstract
Real-time sensing of nitric oxide (NO) in physiological environments is critically important in monitoring neurotransmission, inflammatory responses, cardiovascular systems, etc. Conventional approaches for NO detection relying on indirect colorimetric measurement or built with rigid and permanent materials cannot provide continuous monitoring and/or require additional surgical retrieval of the implants, which comes with increased risks and hospital cost. Herein, we report a flexible, biologically degradable and wirelessly operated electrochemical sensor for real-time NO detection with a low detection limit (3.97 nmol), a wide sensing range (0.01-100 μM), and desirable anti-interference characteristics. The device successfully captures NO evolution in cultured cells and organs, with results comparable to those obtained from the standard Griess assay. Incorporated with a wireless circuit, the sensor platform achieves continuous sensing of NO levels in living mammals for several days. The work may provide essential diagnostic and therapeutic information for health assessment, treatment optimization and postsurgical monitoring.
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Affiliation(s)
- Rongfeng Li
- School of Materials Science and Engineering, The Key Laboratory of Advanced Materials of Ministry of Education, State Key Laboratory of New Ceramics and Fine Processing, Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084, China
| | - Hui Qi
- Laboratory of Musculoskeletal Regenerative Medicine, Beijing Institute of Traumatology and Orthopaedics, Beijing, 100035, China
| | - Yuan Ma
- Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology and Beijing Innovation Center for Future Chips, Tsinghua University, Beijing, 100084, China
| | - Yuping Deng
- School of Materials Science and Engineering, The Key Laboratory of Advanced Materials of Ministry of Education, State Key Laboratory of New Ceramics and Fine Processing, Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084, China
| | - Shengnan Liu
- School of Materials Science and Engineering, The Key Laboratory of Advanced Materials of Ministry of Education, State Key Laboratory of New Ceramics and Fine Processing, Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084, China
| | - Yongsheng Jie
- Laboratory of Musculoskeletal Regenerative Medicine, Beijing Institute of Traumatology and Orthopaedics, Beijing, 100035, China
| | - Jinzhu Jing
- Animal Center, Beijing Institute of Traumatology and Orthopaedics, Beijing, 100035, China
| | - Jinlong He
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, 300070, China
| | - Xu Zhang
- Tianjin Key Laboratory of Metabolic Diseases, Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, 300070, China
| | - Laura Wheatley
- Trinity College, University of Oxford, Oxford, OX1 3BH, UK
| | - Congxi Huang
- School of Materials Science and Engineering, The Key Laboratory of Advanced Materials of Ministry of Education, State Key Laboratory of New Ceramics and Fine Processing, Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084, China
| | - Xing Sheng
- Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology and Beijing Innovation Center for Future Chips, Tsinghua University, Beijing, 100084, China
| | - Milin Zhang
- Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology and Beijing Innovation Center for Future Chips, Tsinghua University, Beijing, 100084, China
| | - Lan Yin
- School of Materials Science and Engineering, The Key Laboratory of Advanced Materials of Ministry of Education, State Key Laboratory of New Ceramics and Fine Processing, Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084, China.
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7
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Govêa KP, Pereira RST, de Assis MDO, Alves PI, Brancaglion GA, Toyota AE, Machado JVC, Carvalho DT, de Souza TC, Beijo LA, Trindade LDOR, Barbosa S. Allelochemical Activity of Eugenol-Derived Coumarins on Lactuca sativa L. PLANTS 2020; 9:plants9040533. [PMID: 32326048 PMCID: PMC7238165 DOI: 10.3390/plants9040533] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 04/09/2020] [Accepted: 04/16/2020] [Indexed: 02/06/2023]
Abstract
Coumarins are widely distributed substances in plant species that promote phytotoxic effects, allowing them to be exploited as herbicides less harmful to the environment, since many invasive species have demonstrated resistance to commercially available products. The derived coumarins used in this study had not been tested in plant models and their effect on plants was unknown. The objective of this study was to evaluate the phytotoxic action of these coumarins in bioassays with Lactuca sativa L., in order to select the most responsive substance whose toxicity was best elucidated by chromosomal complement and enzymatic antioxidant metabolism studies. From the phytotoxicity assays, coumarin 8-methoxy-2-oxo-6-(prop-2-en-1-yl)-2H-chromene-3-carboxylic acid (A1), reported here for the first time, was selected as the most responsive and caused a reduction in the following parameters: number of normal seedlings, fresh biomass, root length and shoot length. Subsequent studies demonstrated that this coumarin is cytogenotoxic due to damage caused to the cell cycle and the occurrence of chromosomal abnormalities. However, it did not interfere with antioxidant enzyme activity and did not cause lipid peroxidation. The changes caused by coumarin A1 described herein can contribute to better understanding the allelochemical actions of coumarins and the potential use of these substances in the production of natural herbicides.
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Affiliation(s)
- Kamilla Pacheco Govêa
- Environmental Biotechnology & Genotoxicity Laboratory (BIOGEN), Institute of Nature Sciences (ICN), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (K.P.G.); (R.S.T.P.); (M.D.O.d.A.); (P.I.A.); (L.d.O.R.T.); (S.B.)
| | - Rafaella Sueko Tomita Pereira
- Environmental Biotechnology & Genotoxicity Laboratory (BIOGEN), Institute of Nature Sciences (ICN), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (K.P.G.); (R.S.T.P.); (M.D.O.d.A.); (P.I.A.); (L.d.O.R.T.); (S.B.)
| | - Mateus Donizetti Oliveira de Assis
- Environmental Biotechnology & Genotoxicity Laboratory (BIOGEN), Institute of Nature Sciences (ICN), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (K.P.G.); (R.S.T.P.); (M.D.O.d.A.); (P.I.A.); (L.d.O.R.T.); (S.B.)
| | - Pâmela Ingrid Alves
- Environmental Biotechnology & Genotoxicity Laboratory (BIOGEN), Institute of Nature Sciences (ICN), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (K.P.G.); (R.S.T.P.); (M.D.O.d.A.); (P.I.A.); (L.d.O.R.T.); (S.B.)
| | - Guilherme Andrade Brancaglion
- Pharmaceutical Chemistry Research Laboratory (LQFar), Faculty of Pharmaceutical Sciences (FCF), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (G.A.B.); (A.E.T.); (J.V.C.M.); (D.T.C.)
| | - André Eidi Toyota
- Pharmaceutical Chemistry Research Laboratory (LQFar), Faculty of Pharmaceutical Sciences (FCF), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (G.A.B.); (A.E.T.); (J.V.C.M.); (D.T.C.)
| | - José Vaz Cardoso Machado
- Pharmaceutical Chemistry Research Laboratory (LQFar), Faculty of Pharmaceutical Sciences (FCF), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (G.A.B.); (A.E.T.); (J.V.C.M.); (D.T.C.)
| | - Diogo Teixeira Carvalho
- Pharmaceutical Chemistry Research Laboratory (LQFar), Faculty of Pharmaceutical Sciences (FCF), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (G.A.B.); (A.E.T.); (J.V.C.M.); (D.T.C.)
| | - Thiago Corrêa de Souza
- Environmental Biotechnology & Genotoxicity Laboratory (BIOGEN), Institute of Nature Sciences (ICN), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (K.P.G.); (R.S.T.P.); (M.D.O.d.A.); (P.I.A.); (L.d.O.R.T.); (S.B.)
- Correspondence: ; Tel.: +553-537-019-683
| | - Luiz Alberto Beijo
- Statistics Department, Institute of Exact Sciences (ICEx), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil;
| | - Luciene de Oliveira Ribeiro Trindade
- Environmental Biotechnology & Genotoxicity Laboratory (BIOGEN), Institute of Nature Sciences (ICN), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (K.P.G.); (R.S.T.P.); (M.D.O.d.A.); (P.I.A.); (L.d.O.R.T.); (S.B.)
| | - Sandro Barbosa
- Environmental Biotechnology & Genotoxicity Laboratory (BIOGEN), Institute of Nature Sciences (ICN), Federal University of Alfenas (UNIFAL-MG), Alfenas MG 37130-001, Brazil; (K.P.G.); (R.S.T.P.); (M.D.O.d.A.); (P.I.A.); (L.d.O.R.T.); (S.B.)
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Brown MD, Hall JR, Schoenfisch MH. A direct and selective electrochemical hydrogen sulfide sensor. Anal Chim Acta 2019; 1045:67-76. [PMID: 30454574 PMCID: PMC6641862 DOI: 10.1016/j.aca.2018.08.054] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/17/2018] [Accepted: 08/28/2018] [Indexed: 01/23/2023]
Abstract
Continuous, in situ detection of hydrogen sulfide (H2S) in biological milieu is made possible with electrochemical methods, but direct amperometry is constrained by the generation of elemental sulfur as an oxidative byproduct. Deposition of a sulfur layer passivates the working electrode, reducing sensitivity and causing performance variability. Herein, we report on the use of a surface preconditioning procedure to deposit elemental sulfur on a glassy carbon electrode prior to measurement and evaluate performance with common analytical metrics. The lack of traditional anti-poisoning techniques (e.g. redox mediators, cleaning pulses) also allowed for facile surface modification with electropolymerized films. For the first time, a series of electropolymerized films were characterized for their H2S permselective behavior against common biological interferents. Highly selective, film-modified electrodes were then evaluated for their anti-biofouling ability in simulated wound fluid. The final optimized electrode was capable of measuring H2S with a low detection limit (i.e., <100 nM) and ∼80% of its initial sensitivity in proteinaceous media.
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Affiliation(s)
- Micah D Brown
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC, 27599, United States
| | - Jackson R Hall
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC, 27599, United States
| | - Mark H Schoenfisch
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC, 27599, United States.
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9
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Development of a flow microsensor for selective detection of nitric oxide in the presence of hydrogen peroxide. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.07.158] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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Bertuola M, Miñán A, Grillo CA, Cortizo MC, Fernández Lorenzo de Mele MA. Corrosion protection of AZ31 alloy and constrained bacterial adhesion mediated by a polymeric coating obtained from a phytocompound. Colloids Surf B Biointerfaces 2018; 172:187-196. [PMID: 30153620 DOI: 10.1016/j.colsurfb.2018.08.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 07/18/2018] [Accepted: 08/14/2018] [Indexed: 12/14/2022]
Abstract
The prevention of microbial biofilm formation on a biomaterial surface is crucial in avoiding implants failures and the development of antibiotic resistant bacteria. It was reported that biodegradable Mg alloys may show antimicrobial effects due to the alkalinization of the corroding area. However, this issue is controversial and deserves a detailed study, since the processes occurring at the [biodegradable metal/biological medium] interface are complex and varied. Results showed that bacterial adhesion on AZ31 was lower than that of the titanium control and revealed that was dependent on surface composition, depicting some preferential sites for bacterial attachment (C-, P-, O-containing corrosion products) and others that are particularly avoided (active corrosion sites). As a key challenge, a strategy able to improve the performance of Mg alloys by both, reducing the formation of corrosion products and inhibiting bacterial adhesion was subsequently developed. A polymeric layer (polyTOH) was obtained by electropolymerization of thymol (TOH), a phytophenolic compound. The polyTOH can operate as a multifunctional film that improves the surface characteristics of the AZ31 Mg alloy by enhancing corrosion resistance (ions release was reduced to almost the half during the first days) and create an anti-adherent surface (bacterial attachment was 30-fold lower on polyTOH-AZ31 than on non-coated Mg alloy and 200-fold lower than Ti control and was constrained to specific regions). This anti-adherent property implies an additional advantage: enhancement of the efficacy of antibiotic treatments.
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Affiliation(s)
- M Bertuola
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, CCT La Plata-CONICET), Facultad de Ciencias Exactas, Departamento de Química, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina.
| | - A Miñán
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, CCT La Plata-CONICET), Facultad de Ciencias Exactas, Departamento de Química, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina.
| | - C A Grillo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, CCT La Plata-CONICET), Facultad de Ciencias Exactas, Departamento de Química, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina.
| | - M C Cortizo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, CCT La Plata-CONICET), Facultad de Ciencias Exactas, Departamento de Química, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina; Facultad de Odontología, Universidad Nacional de La Plata, Calle 50 y 1, 1900, La Plata, Argentina.
| | - M A Fernández Lorenzo de Mele
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, CCT La Plata-CONICET), Facultad de Ciencias Exactas, Departamento de Química, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina; Facultad de Ingeniería, Universidad Nacional de La Plata, Calle 47 y 1, 1900, La Plata, Argentina.
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Monti P, Rocchitta G, Marceddu S, Dettori MA, Fabbri D, Jaoua S, Migheli Q, Delogu G, Serra PA. Use of β-cyclodextrin as enhancer of ascorbic acid rejection in permselective films for amperometric biosensor applications. Talanta 2018; 186:53-59. [DOI: 10.1016/j.talanta.2018.04.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 03/30/2018] [Accepted: 04/08/2018] [Indexed: 12/14/2022]
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Ziyatdinova G, Kozlova E, Budnikov H. Polyquercetin/MWNT-modified Electrode for the Determination of Natural Phenolic Antioxidants. ELECTROANAL 2017. [DOI: 10.1002/elan.201700440] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Guzel Ziyatdinova
- Analytical Chemistry Department, A. M. Butlerov Institute of Chemistry; Kazan Federal University, Kremlyevskaya, 18; Kazan 420008 Russian Federation
| | - Ekaterina Kozlova
- Analytical Chemistry Department, A. M. Butlerov Institute of Chemistry; Kazan Federal University, Kremlyevskaya, 18; Kazan 420008 Russian Federation
| | - Herman Budnikov
- Analytical Chemistry Department, A. M. Butlerov Institute of Chemistry; Kazan Federal University, Kremlyevskaya, 18; Kazan 420008 Russian Federation
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13
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The effect of silver salts and lignosulfonates in the synthesis of lignosulfonate-stabilized silver nanoparticles. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.05.065] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Brown MD, Schoenfisch MH. Nitric oxide permselectivity in electropolymerized films for sensing applications. ACS Sens 2016; 1:1453-1461. [PMID: 31875180 DOI: 10.1021/acssensors.6b00596] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The presence of biological interferents in physiological media necessitates chemical modification of the working electrode to facilitate accurate electrochemical measurement of nitric oxide (NO). In this study, we evaluated a series of self-terminating electropolymerized films prepared from one of three isomers of phenylenediamine (PD), phenol, eugenol, or 5-amino-1-naphthol (5A1N) to improve the NO selectivity of a platinum working electrode. The electrodeposition procedure for each monomer was individually optimized using cyclic voltammetry (CV) or constant potential amperometry (CPA). Cyclic voltammetry deposition parameters favoring slower film formation generally yielded films with improved selectivity for NO over nitrite and l-ascorbate. Nitric oxide sensors were fabricated and compared using the optimized deposition procedure for each monomer. Sensors prepared using poly-phenol and poly-5A1N film-modified platinum working electrodes demonstrated the most ideal analytical performance, with the former demonstrating the best selectivity. In simulated wound fluid, platinum electrodes modified with poly-5A1N films proved superior with respect to the NO sensitivity and detection limit.
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Affiliation(s)
- Micah D. Brown
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North
Carolina 27599, United States
| | - Mark H. Schoenfisch
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North
Carolina 27599, United States
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15
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Monti P, Calia G, Marceddu S, Dettori MA, Fabbri D, Jaoua S, O'Neill RD, Migheli Q, Delogu G, Serra PA. Low electro-synthesis potentials improve permselectivity of polymerized natural phenols in biosensor applications. Talanta 2016; 162:151-158. [PMID: 27837811 DOI: 10.1016/j.talanta.2016.10.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 09/27/2016] [Accepted: 10/02/2016] [Indexed: 01/01/2023]
Abstract
First-generation amperometric biosensors are often based on the electro-oxidation of oxidase-generated H2O2. At the applied potential used in most studies, other molecules such as ascorbic acid or dopamine can be oxidized. Phenylenediamines are commonly used to avoid this problem: when these compounds are electro-deposited onto the transducer surface in the form of poly-phenylenediamine, a highly selective membrane is formed. Although there is no evidence of toxicity of the resulting polymer, phenylenediamine monomers are considered carcinogenic. An aim of this work was to evaluate the suitability of natural phenols as non-toxic alternatives to the ortho isomer of phenylenediamine. Electrosynthesis over Pt-Ir electrodes of 2-methoxy phenols (guaiacol, eugenol and isoeugenol), and hydroxylated biphenyls (dehydrodieugenol and magnolol) was achieved. The potentials used in the present study are significantly lower than values commonly applied during electro-polymerization. Polymers were obtained by means of constant potential amperometry, instead of cyclic voltammetry, in order to achieve multiple polymerizations, hence decreasing the time of realization and variability. Permselective properties of natural phenols were significantly improved at low polymerization potentials. Among the tested compounds, isoeugenol and magnolol, polymerized respectively at +25mV and +170mV against Ag/AgCl reference electrode, proved as permselective as poly-ortho-phenylenediamine and may be considered as effective polymeric alternatives. The natural phenol-coated electrodes were stable and responsive throughout 14 days. A biosensor prototype based on acetylcholine esterase and choline oxidase was electro-coated with poly-magnolol in order to evaluate the interference-rejecting properties of the electrosynthesized film in an amperometric biosensor; a moderate decrease in ascorbic acid rejection was observed during in vitro calibration of biosensors.
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Affiliation(s)
- Patrizia Monti
- Dipartimento di Agraria and Unità di Ricerca Istituto Nazionale di Biostrutture e Biosistemi, Università degli Studi di Sassari, Viale Italia 39, I-07100 Sassari, Italy; Istituto CNR di Chimica Biomolecolare, UOS Sassari, Traversa La Crucca 3, I-07100 Sassari, Italy
| | - Giammario Calia
- Dipartimento di Agraria and Unità di Ricerca Istituto Nazionale di Biostrutture e Biosistemi, Università degli Studi di Sassari, Viale Italia 39, I-07100 Sassari, Italy; Dipartimento di Medicina Clinica e Sperimentale, Università degli Studi di Sassari, Viale S. Pietro 43/b, I-07100 Sassari, Italy
| | - Salvatore Marceddu
- Istituto CNR di Scienze delle Produzioni Alimentari, UOS Sassari, Traversa La Crucca 3, I-07100 Sassari, Italy
| | - Maria A Dettori
- Istituto CNR di Chimica Biomolecolare, UOS Sassari, Traversa La Crucca 3, I-07100 Sassari, Italy
| | - Davide Fabbri
- Istituto CNR di Chimica Biomolecolare, UOS Sassari, Traversa La Crucca 3, I-07100 Sassari, Italy
| | - Samir Jaoua
- Department of Biological & Environmental Sciences, College of Arts and Sciences, Qatar University, P.O. Box: 2713, Doha, Qatar
| | - Robert D O'Neill
- UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Quirico Migheli
- Dipartimento di Agraria and Unità di Ricerca Istituto Nazionale di Biostrutture e Biosistemi, Università degli Studi di Sassari, Viale Italia 39, I-07100 Sassari, Italy
| | - Giovanna Delogu
- Istituto CNR di Chimica Biomolecolare, UOS Sassari, Traversa La Crucca 3, I-07100 Sassari, Italy
| | - Pier A Serra
- Dipartimento di Medicina Clinica e Sperimentale, Università degli Studi di Sassari, Viale S. Pietro 43/b, I-07100 Sassari, Italy.
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Bertuola M, Pissinis DE, Rubert AA, Prieto ED, Fernández Lorenzo de Mele MA. Impact of molecular structure of two natural phenolic isomers on the protective characteristics of electropolymerized nanolayers formed on copper. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.08.100] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Differential pulse voltammetric determination of eugenol at a pencil graphite electrode. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 60:156-162. [DOI: 10.1016/j.msec.2015.11.031] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 10/30/2015] [Accepted: 11/11/2015] [Indexed: 12/22/2022]
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18
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Ziyatdinova G, Kozlova E, Budnikov H. Electropolymerized Eugenol-MWNT-Based Electrode for Voltammetric Evaluation of Wine Antioxidant Capacity. ELECTROANAL 2015. [DOI: 10.1002/elan.201400712] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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19
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Calia G, Monti P, Marceddu S, Dettori MA, Fabbri D, Jaoua S, O'Neill RD, Serra PA, Delogu G, Migheli Q. Electropolymerized phenol derivatives as permselective polymers for biosensor applications. Analyst 2015; 140:3607-15. [PMID: 25857616 DOI: 10.1039/c5an00363f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Amperometric biosensors are often coated with a polymeric permselective film to avoid electroactive interference by reducing agents present in the target medium. Phenylenediamine and phenol monomers are commonly used to form these permselective films in the design of microsensors and biosensors. This paper aims to evaluate the permselectivity, stability and lifetime of polymers electrosynthesized using either constant potential amperometry (CPA) or cyclic voltammetry (CV) from naturally occurring phenylpropanoids in monomeric and dimeric forms (eugenol, isoeugenol, dehydrodieugenol and magnolol). Sensors were characterized by scanning electron microscopy and permselectivity analysis. Magnolol formed an electro-deposited polymer with a more defined three-dimensional texture in comparison with the other films. The phenol-derived films showed different permselectivity towards H2O2 over ascorbic acid and dopamine, likely to be related to the thickness and compactness of the polymer. The CV-derived films had a better permselectivity compared to the CPA-corresponding polymers. Based on these results, the permselectivity, stability and lifetime of a biosensor for glucose were studied when a magnolol coating was electro-deposited. The structural principles governing the permselectivity of the magnolol-derived film are suggested to be mainly related to the conformational flexibility of this monomer. Newly designed biosensors, coated with electropolymerized natural phenol derivatives, may represent promising analytical devices for different application fields.
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Affiliation(s)
- Giammario Calia
- Dipartimento di Agraria and Unità di Ricerca Istituto Nazionale di Biostrutture e Biosistemi, Università degli Studi di Sassari, Viale Italia 39, I-07100 Sassari, Italy
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20
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Kang SZ, Liu H, Li X, Sun M, Mu J. Electrochemical behavior of eugenol on TiO2nanotubes improved with Cu2O clusters. RSC Adv 2014. [DOI: 10.1039/c3ra44895a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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21
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One-step synthesis of lignosulfonate-stabilized silver nanoparticles. Colloids Surf B Biointerfaces 2013; 105:335-41. [DOI: 10.1016/j.colsurfb.2013.01.010] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 01/03/2013] [Accepted: 01/04/2013] [Indexed: 11/19/2022]
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22
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Milczarek G, Ciszewski A. Functionalized gold nanoparticles and films stabilized by in situ formed polyeugenol. Colloids Surf B Biointerfaces 2011; 90:53-7. [PMID: 22019258 DOI: 10.1016/j.colsurfb.2011.09.047] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Accepted: 09/27/2011] [Indexed: 10/17/2022]
Abstract
Eugenol (2-methoxy-4-allyl-phenol) was used as a reducing agent for one-pot synthesis of gold nanoparticles in a mild alkaline aqueous/organic solution at room temperature. In this reaction, eugenol acts also as a stabilizing agent, since it undergoes polymerization upon oxidation. As a result, stable colloids of polyeugenol (PE)-capped gold nanoparticles are formed during the reaction with the average particle size of 44 nm. Moreover, conducting supports, such as ITO glass, are covered by Au/PE composite film when immersed in the reaction medium. The modified ITO shows redox activity assignable to residual quinone moieties of PE with redox couples at a potential range of -0.2 to 0.4V (vs. Ag/AgCl at pH 7.4). Redox properties of Au/PE nanoparticulate films can be exploited for the electrocatalytic oxidation of NADH with over 0.5 V reduction of the reaction overpotential vs. unmodified ITO. Nanoparticulate composite films were characterized by UV-vis spectroscopy, XPS and FT-IR spectroscopy. The characterization revealed structural similarity of the formed PE to lignin.
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Affiliation(s)
- Grzegorz Milczarek
- Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Poznan, Poland.
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23
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Toniolo R, Dossi N, Pizzariello A, Susmel S, Bontempelli G. Simultaneous Detection of Ascorbic Acid and Hydrogen Peroxide by Flow-Injection Analysis with a Thin Layer Dual-Electrode Detector. ELECTROANAL 2010. [DOI: 10.1002/elan.201000511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Arguello J, Magosso HA, Canevari TC, Landers R, Gushikem Y. Activity of SiDbCl in the Electrooxidation of Ascorbic Acid, Dopamine, and Uric Acid. ELECTROANAL 2010. [DOI: 10.1002/elan.201000390] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Rozniecka E, Zawisza I, Jawiczuk M, Branowska D, Opallo M. Electrochemical and IR spectroscopic detection of oxidation products of the monomer and dimer of vanillyl alcohol in a sol–gel processed silicate matrix. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.04.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Gu F, Xu GQ, Ang SG. Studies on CuTAPc-nanotube-modified electrodes as chemical sensors for NO. NANOTECHNOLOGY 2009; 20:305501. [PMID: 19581690 DOI: 10.1088/0957-4484/20/30/305501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Poly-copper tetraaminophthalocyanine (CuTAPc) nanotubes were successfully fabricated on porous alumina templates by electropolymerization. Their high surface area and simple preparation protocol made them potential candidates as the modification layer of electrodes for sensor application. High sensitivities and improved linear ranges were obtained through different measurements such as differential pulse voltammetry (DPV), differential potential amperometric (DPA) and electrochemical impedance spectroscopy (EIS). Detection limits as low as 10 nM were demonstrated in common voltammetric analysis with ultra-high response current in the microA range.
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Affiliation(s)
- Feng Gu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
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27
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Milczarek G. Preparation, characterization and electrocatalytic properties of an iodine|lignin-modified gold electrode. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2008.11.050] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Hetrick EM, Schoenfisch MH. Analytical chemistry of nitric oxide. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2009; 2:409-33. [PMID: 20636069 PMCID: PMC3563389 DOI: 10.1146/annurev-anchem-060908-155146] [Citation(s) in RCA: 213] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Nitric oxide (NO) is the focus of intense research primarily because of its wide-ranging biological and physiological actions. To understand its origin, activity, and regulation, accurate and precise measurement techniques are needed. Unfortunately, analytical assays for monitoring NO are challenged by NO's unique chemical and physical properties, including its reactivity, rapid diffusion, and short half-life. Moreover, NO concentrations may span the picomolar-to-micromolar range in physiological milieus, requiring techniques with wide dynamic response ranges. Despite such challenges, many analytical techniques have emerged for the detection of NO. Herein, we review the most common spectroscopic and electrochemical methods, with a focus on the underlying mechanism of each technique and on approaches that have been coupled with modern analytical measurement tools to create novel NO sensors.
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Affiliation(s)
- Evan M. Hetrick
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Mark H. Schoenfisch
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
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29
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Santos RM, Lourenço CF, Piedade AP, Andrews R, Pomerleau F, Huettl P, Gerhardt GA, Laranjinha J, Barbosa RM. A comparative study of carbon fiber-based microelectrodes for the measurement of nitric oxide in brain tissue. Biosens Bioelectron 2008; 24:704-9. [DOI: 10.1016/j.bios.2008.06.034] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Revised: 06/03/2008] [Accepted: 06/23/2008] [Indexed: 10/21/2022]
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30
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Shin JH, Privett BJ, Kita JM, Wightman RM, Schoenfisch MH. Fluorinated xerogel-derived microelectrodes for amperometric nitric oxide sensing. Anal Chem 2008; 80:6850-9. [PMID: 18714964 PMCID: PMC2772994 DOI: 10.1021/ac800185x] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An amperometric fluorinated xerogel-derived nitric oxide (NO) microelectrode is described. A range of fluorine-modified xerogel polymers were synthesized via the cohydrolysis and condensation of alkylalkoxy- and fluoroalkoxysilanes. Such polymers were evaluated as NO sensor membranes to identify the optimum composition for maximizing NO permeability while providing sufficient selectivity for NO in the presence of common interfering species. By taking advantage of both the versatility of sol-gel chemistry and the "poly(tetrafluoroethylene)-like" high NO permselective properties of the xerogels, the performance of the fluorinated xerogel-derived sensors was excellent, surpassing all miniaturized NO sensors reported to date. In contrast to previous electrochemical NO sensor designs, xerogel-based NO microsensors were fabricated using a simple, reliable dip-coating procedure. An optimal permselective membrane was achieved by synthesizing xerogels of methyltrimethoxysilane (MTMOS) and 20% (heptadecafluoro-1,1,2,2-tetrahydrodecyl)trimethoxysilane (17FTMS, balance MTMOS) under acid-catalyzed conditions. The resulting NO microelectrode had a conical tip of approximately 20 microm in diameter and approximately 55 microm in length and exhibited sensitivities of 7.91 pA x nM (-1) from 0.2 to 3.0 nM (R (2) = 0.9947) and 7.60 nA x microM (-1) from 0.5 to 4.0 microM ( R (2) = 0.9999), detection limit of 83 pM (S/ N = 3), response time ( t 95%) of <3 s, and selectivity (log K NO, j (amp)) of -5.74, <-6, <-6, <-6, <-6, -5.84, and -1.33 for j = nitrite, ascorbic acid, uric acid, acetaminophen, dopamine, ammonia/ammonium, and carbon monoxide. In addition, the sensor proved functional up to 20 d, maintaining >or=90% of the sensor's initial sensitivity without serious deterioration in selectivity.
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Affiliation(s)
- Jae Ho Shin
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Benjamin J. Privett
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Justin M. Kita
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - R. Mark Wightman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Mark H. Schoenfisch
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
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31
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Okumura L, Stradiotto N, Rees N, Compton R. Modifying Glassy Carbon (GC) Electrodes to Confer Selectivity for the Voltammetric Detection ofL-Cysteine in the Presence ofdl-Homocysteine and Glutathione. ELECTROANAL 2008. [DOI: 10.1002/elan.200704151] [Citation(s) in RCA: 12] [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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Vassão DG, Davin LB, Lewis NG. Metabolic Engineering of Plant Allyl/Propenyl Phenol and Lignin Pathways: Future Potential for Biofuels/Bioenergy, Polymer Intermediates, and Specialty Chemicals? BIOENGINEERING AND MOLECULAR BIOLOGY OF PLANT PATHWAYS 2008. [DOI: 10.1016/s1755-0408(07)01013-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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33
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Selective and sensitive detection of nitrite based on NO sensing on a polymer-coated rotating disc electrode. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2007.07.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Milczarek G. Spontaneous formation of an electroactive co-polymeric film derived from nordihydroguaiaretic acid and 4,4′-diaminobibenzyl. Electrochem commun 2007. [DOI: 10.1016/j.elecom.2007.03.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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35
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Yildiz HB, Castillo J, Guschin DA, Toppare L, Schuhmann W. Phenol biosensor based on electrochemically controlled integration of tyrosinase in a redox polymer. Mikrochim Acta 2007. [DOI: 10.1007/s00604-007-0768-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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36
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Patel BA, Arundell M, Parker KH, Yeoman MS, O'Hare D. Detection of nitric oxide release from single neurons in the pond snail, Lymnaea stagnalis. Anal Chem 2007; 78:7643-8. [PMID: 17105154 DOI: 10.1021/ac060863w] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Multiple film-coated nitric oxide sensors have been fabricated using Nafion and electropolymerized polyeugenol or o-phenylenediamine on 30-microm carbon fiber disk electrodes. This is a rare study that utilizes disk electrodes rather than the widely used protruding tip microelectrodes in order to measure from a biological environment. These electrodes have been used to evaluate the differences in nitric oxide release between two different identified neurons in the pond snail, Lymnaea stagnalis. These results show the first direct measurements of nitric oxide release from individual neurons. The electrodes are very sensitive to nitric oxide with a detection limit of 2.8 nM and a sensitivity of 9.46 nA microM-1. The sensor was very selective against a variety of neurochemical interferences such as ascorbic acid, uric acid, and catecholamines and secondary oxidation products such as nitrite. Nitric oxide release was measured from the cell bodies of two neurons, the cerebral giant cell (CGC) and the B2 buccal motor neuron, in the intact but isolated CNS. A high-Ca2+/high-K+ stimulus was capable of evoking reproducible release. For a given stimulus, the B2 neuron released more nitric oxide than the CGC neuron; however, both cells were equally suppressed by the NOS inhibitor l-NAME.
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Affiliation(s)
- Bhavik Anil Patel
- Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK.
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37
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Delogu G, Fabbri D, Dettori MA, Forni A, Casalone G. Enantiopure 2,2′-dihydroxy-3,3′-dimethoxy-5,5′-diallyl-6,6′-dibromo-1,1′-biphenyl: a conformationally stable C2-dimer of a eugenol derivative. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2003.11.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Milczarek G, Ciszewski A. Permselective Properties of Electropolymerized Guaiacol Derivatives. ELECTROANAL 2003. [DOI: 10.1002/elan.200390064] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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