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Dorovskikh SI, Klyamer DD, Fedorenko AD, Morozova NB, Basova TV. Electrochemical Sensor Based on Iron(II) Phthalocyanine and Gold Nanoparticles for Nitrite Detection in Meat Products. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22155780. [PMID: 35957335 PMCID: PMC9371027 DOI: 10.3390/s22155780] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/18/2022] [Accepted: 07/29/2022] [Indexed: 05/27/2023]
Abstract
Nitrites are widely used in the food industry, particularly for the preservation of meat products. Controlling the nitrate content in food is an important task to ensure people's health is not at risk; therefore, the search for, and research of, new materials that will modify the electrodes in the electrochemical sensors that detect and control the nitrate content in food products is an urgent task. In this paper, we describe the electrochemical behavior of a glass carbon electrode (GCE), modified with a Fe(II) tetra-tert-butyl phthalocyanine film (FePc(tBu)4/GCE), and decorated with gold nanoparticles (Au/FePc(tBu)4/GCE); this electrode was deposited using gas-phase methods. The composition and morphology of such electrodes were examined using spectroscopy and electron microscopy methods, whereas the main electrochemical characteristics were determined using cyclic voltammetry (CV) and amperometry (CA) methods in the linear ranges of CV 0.25-2.5 mM, CA 2-120 μM in 0.1 M phosphate buffer (pH = 6.8). The results showed that the modification of bare GCEs, with a Au/FePc(tBu)4 heterostructure, provided a high surface-to-volume ratio, thus ensuring its high sensitivity to nitrite ions of 0.46 μAμM-1. The sensor based on the Au/FePc(tBu)4/GCE has a low limit of nitrite detection at 0.35 μM, good repeatability, and stability. The interference study showed that the proposed Au/FePc(tBu)4/GCE exhibited a selective response in the presence of interfering anions, and the analytical capability of the sensor was demonstrated by determining nitrite ions in real samples of meat products.
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Ahammad AS, Alam MK, Islam T, Hasan MM, Karim R, Anju AN, Mozumder MI. Poly (brilliant cresyl blue)-reduced graphene oxide modified activated GCE for nitrite detection: Analyzing the synergistic interactions through experimental and computational study. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136375] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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3
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Diouf A, El Bari N, Bouchikhi B. A novel electrochemical sensor based on ion imprinted polymer and gold nanomaterials for nitrite ion analysis in exhaled breath condensate. Talanta 2020; 209:120577. [DOI: 10.1016/j.talanta.2019.120577] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 02/01/2023]
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Han Y, Zhang R, Dong C, Cheng F, Guo Y. Sensitive electrochemical sensor for nitrite ions based on rose-like AuNPs/MoS2/graphene composite. Biosens Bioelectron 2019; 142:111529. [DOI: 10.1016/j.bios.2019.111529] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 07/20/2019] [Indexed: 12/19/2022]
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5
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Liu YC, Hsu CH, Lu BJ, Lin PY, Ho ML. Determination of nitrite ions in environment analysis with a paper-based microfluidic device. Dalton Trans 2018; 47:14799-14807. [DOI: 10.1039/c8dt02960a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A new microfluidic paper-based analytical device, a (Ag-μPAD)-based chemiresistor composed of silver ink, has been developed for the selective, sensitive, and quantitative determination of nitrite ions in environmental analysis.
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Affiliation(s)
- Yu-Ci Liu
- Department of Chemistry
- Soochow University
- Taipei 111
- Taiwan
| | - Chia-Hui Hsu
- Department of Chemistry
- Soochow University
- Taipei 111
- Taiwan
| | - Bing-Jyun Lu
- Department of Chemistry
- Soochow University
- Taipei 111
- Taiwan
| | - Peng-Yi Lin
- Department of Chemistry
- Soochow University
- Taipei 111
- Taiwan
| | - Mei-Lin Ho
- Department of Chemistry
- Soochow University
- Taipei 111
- Taiwan
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Üzer A, Sağlam Ş, Can Z, Erçağ E, Apak R. Electrochemical Determination of Food Preservative Nitrite with Gold Nanoparticles/p-Aminothiophenol-Modified Gold Electrode. Int J Mol Sci 2016; 17:ijms17081253. [PMID: 27490543 PMCID: PMC5000651 DOI: 10.3390/ijms17081253] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 07/24/2016] [Accepted: 07/28/2016] [Indexed: 02/01/2023] Open
Abstract
Due to the negative impact of nitrate and nitrite on human health, their presence exceeding acceptable levels is not desired in foodstuffs. Thus, nitrite determination at low concentrations is a major challenge in electroanalytical chemistry, which can be achieved by fast, cheap, and safe electrochemical sensors. In this work, the working electrode (Au) was functionalized with p-aminothiophenol (p-ATP) and modified with gold nanoparticles (Au-NPs) to manufacture the final (Au/p-ATP-Aunano) electrode in a two-step procedure. In the first step, p-ATP was electropolymerized on the electrode surface to obtain a polyaminothiophenol (PATP) coating. In the second step, Au/p-ATP-Aunano working electrode was prepared by coating the surface with the use of HAuCl4 solution and cyclic voltammetry. Determination of aqueous nitrite samples was performed with the proposed electrode (Au/p-ATP-Aunano) using square wave voltammetry (SWV) in pH 4 buffer medium. Characteristic peak potential of nitrite samples was 0.76 V, and linear calibration curves of current intensity versus concentration was linear in the range of 0.5–50 mg·L−1 nitrite with a limit of detection (LOD) of 0.12 mg·L−1. Alternatively, nitrite in sausage samples could be colorimetrically determined with high sensitivity by means of p-ATP‒modified gold nanoparticles (AuNPs) and naphthylethylene diamine as coupling agents for azo-dye formation due to enhanced charge-transfer interactions with the AuNPs surface. The slopes of the calibration lines in pure NO2− solution and in sausage sample solution, to which different concentrations of NO2− standards were added, were not significantly different from each other, confirming the robustness and interference tolerance of the method. The proposed voltammetric sensing method was validated against the colorimetric nanosensing method in sausage samples.
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Affiliation(s)
- Ayşem Üzer
- Analytical Chemistry Division, Chemistry Department, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Şener Sağlam
- Analytical Chemistry Division, Chemistry Department, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Ziya Can
- Analytical Chemistry Division, Chemistry Department, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Erol Erçağ
- Analytical Chemistry Division, Chemistry Department, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
| | - Reşat Apak
- Analytical Chemistry Division, Chemistry Department, Faculty of Engineering, Istanbul University, Avcilar, 34320 Istanbul, Turkey.
- Turkish Academy of Sciences (TUBA) Piyade st. No: 27, 06690 Çankaya Ankara, Turkey.
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7
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Dağcı K, Alanyalıoğlu M. Preparation of Free-Standing and Flexible Graphene/Ag Nanoparticles/Poly(pyronin Y) Hybrid Paper Electrode for Amperometric Determination of Nitrite. ACS APPLIED MATERIALS & INTERFACES 2016; 8:2713-2722. [PMID: 26757200 DOI: 10.1021/acsami.5b10973] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A flexible and free-standing graphene-based hybrid paper was successfully fabricated by successive applications of vacuum filtration and electropolymerization. First, a suspension including graphene oxide (GO) and silver nanoparticles (AgNPs) was prepared, and GO/AgNPs paper was obtained by vacuum-filtration of this suspension through a membrane. This GO/AgNPs paper was transformed to rGO/AgNPs paper by using both chemical reduction with HI and thermal annealing procedures. rGO/AgNPs/poly(PyY) hybrid paper electrode was formed by electropolymerization of Pyronin Y (PyY) on rGO/AgNPs paper electrode from a PyY monomer-containing (pH 1.0) solution. Structural, chemical, and morphological characterization of this hybrid paper was carried out by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, Raman spectroscopy, infrared spectroscopy, UV-vis absorption spectroscopy, four-point probe conductivity measurement, and cyclic voltammetry techniques. Electrooxidation of nitrite on rGO/AgNPs/poly(PyY) hybrid paper electrode has been achieved at 860 mV with a linear range of 0.1-1000 μM, sensitivity of 13.5 μAμM(-1)cm(-2), and a detection limit of 0.012 μM. Amperometry studies have shown that the hybrid paper electrode is suitable for amperometric determination of nitrite in both standard laboratory samples and real samples. Moreover, this paper electrode selectively detects nitrite even in the presence of 100-fold common ions and exhibits an excellent operational stability and good flexibility.
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Affiliation(s)
- Kader Dağcı
- Atatürk University , Sciences Faculty, Department of Chemistry, 25240 Erzurum, Turkey
| | - Murat Alanyalıoğlu
- Atatürk University , Sciences Faculty, Department of Chemistry, 25240 Erzurum, Turkey
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Sahraoui Y, Sbartai A, Chaliaa S, Maaref A, Haddad A, Jaffrezic-Renault N. A Nitrite Electrochemical Sensor Based on Boron-Doped Diamond Planar Electrochemical Microcells Modified with a Monolacunary Silicotungstate Polyoxoanion. ELECTROANAL 2015. [DOI: 10.1002/elan.201400682] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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Barsan MM, Ghica ME, Brett CMA. Electrochemical sensors and biosensors based on redox polymer/carbon nanotube modified electrodes: a review. Anal Chim Acta 2015; 881:1-23. [PMID: 26041516 DOI: 10.1016/j.aca.2015.02.059] [Citation(s) in RCA: 208] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 02/20/2015] [Accepted: 02/22/2015] [Indexed: 11/24/2022]
Abstract
The aim of this review is to present the contributions to the development of electrochemical sensors and biosensors based on polyphenazine or polytriphenylmethane redox polymers together with carbon nanotubes (CNT) during recent years. Phenazine polymers have been widely used in analytical applications due to their inherent charge transport properties and electrocatalytic effects. At the same time, since the first report on a CNT-based sensor, their application in the electroanalytical chemistry field has demonstrated that the unique structure and properties of CNT are ideal for the design of electrochemical (bio)sensors. We describe here that the specific combination of phenazine/triphenylmethane polymers with CNT leads to an improved performance of the resulting sensing devices, because of their complementary electrical, electrochemical and mechanical properties, and also due to synergistic effects. The preparation of polymer/CNT modified electrodes will be presented together with their electrochemical and surface characterization, with emphasis on the contribution of each component on the overall properties of the modified electrodes. Their importance in analytical chemistry is demonstrated by the numerous applications based on polymer/CNT-driven electrocatalytic effects, and their analytical performance as (bio) sensors is discussed.
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Affiliation(s)
- Madalina M Barsan
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - M Emilia Ghica
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - Christopher M A Brett
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal.
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Adekunle AS, Lebogang S, Gwala PL, Tsele TP, Olasunkanmi LO, Esther FO, Boikanyo D, Mphuthi N, Oyekunle JAO, Ogunfowokan AO, Ebenso EE. Electrochemical response of nitrite and nitric oxide on graphene oxide nanoparticles doped with Prussian blue (PB) and Fe2O3 nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra02008e] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Electrocatalytic behaviour of graphene oxide (GO), iron(iii) oxide (Fe2O3) and Prussian blue (PB) nanoparticles towards nitrite (NO2−) and nitric oxide (NO) oxidation was investigated on a platinum modified electrode.
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Affiliation(s)
- Abolanle S. Adekunle
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | - Seonyane Lebogang
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | - Portia L. Gwala
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | - Tebogo P. Tsele
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | - Lukman O. Olasunkanmi
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | - Fayemi O. Esther
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | - Diseko Boikanyo
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | - Ntsoaki Mphuthi
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
| | | | | | - Eno E. Ebenso
- Material Science Innovation and Modelling (MaSIM) Research Focus Area
- Faculty of Agriculture, Science and Technology
- North-West University (Mafikeng Campus)
- Mmabatho 2735
- South Africa
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Sivasubramanian R, Sangaranarayanan MV. Electrochemical Sensing of Nitrite Ions Using Tin-Submicroparticles Modified Glassy Carbon Electrodes. ELECTROANAL 2014. [DOI: 10.1002/elan.201400259] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Gligor D, Walcarius A. Glassy carbon electrode modified with a film of poly(Toluidine Blue O) and carbon nanotubes for nitrite detection. J Solid State Electrochem 2014. [DOI: 10.1007/s10008-013-2365-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Gupta S, Prakash R. Photochemical assisted formation of silver nano dendrites and their application in amperometric sensing of nitrite. RSC Adv 2014. [DOI: 10.1039/c3ra45360j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Dağcı K, Alanyalıoğlu M. Electrochemical preparation of polymeric films of pyronin Y and its electrolcatalytic properties for amperometric detection of nitrite. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.10.016] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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Majidi MR, Saadatirad A, Alipour E. Pencil Lead Electrode Modified with Hemoglobin Film as a Novel Biosensor for Nitrite Determination. ELECTROANAL 2013. [DOI: 10.1002/elan.201300082] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Qinghai S, Bats JW, Schmittel M. Two closely related iridium(III) complexes as colorimetric and fluorometric chemodosimeters for nitrite in aqueous solution operating along different modes of action. Inorg Chem 2011; 50:10531-3. [PMID: 21999680 DOI: 10.1021/ic201753v] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two closely related dual-channel chemodosimeters for nitrite in buffered aqueous acetonitrile were developed using [(pq)(2)IrCl](2) (1) and [(ppy)(2)IrCl](2) (2). In the UV-vis channel, the addition of nitrite caused visibly distinct color changes with both probes as a result of sizable absorption intensity enhancements. In the photoluminescence channel, the probes behaved oppositely upon the addition of nitrite. The emission was increased with 1, while it was quenched with 2. NMR and X-ray studies indicated that structurally very different η(1)-nitrito-N and η(2)-nitrito-O,O' complexes were formed. Linear relationships for the quantification were obtained in both channels, allowing one to analyze for NO(2)(-) in a range from 5 × 10(-5) to 2 × 10(-2) M.
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Affiliation(s)
- Shu Qinghai
- Center for Micro- and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein Strasse, D-57068 Siegen, Germany
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17
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Ojani R, Raoof JB, Rahemi V. A Simple and Efficient Electrochemical Sensor for Electrocatalytic Reduction of Nitrite Based on Poly(4-aminoacetanilide) Film Using Carbon Paste Electrode. J CHIN CHEM SOC-TAIP 2011. [DOI: 10.1002/jccs.201190084] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Pauliukaite R, Ghica ME, Barsan MM, Brett CMA. Phenazines and Polyphenazines in Electrochemical Sensors and Biosensors. ANAL LETT 2010. [DOI: 10.1080/00032711003653791] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Adekunle AS, Pillay J, Ozoemena KI. Probing the electrochemical behaviour of SWCNT–cobalt nanoparticles and their electrocatalytic activities towards the detection of nitrite at acidic and physiological pH conditions. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.02.102] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Yang DW, Liu HH. Poly(brilliant cresyl blue)-carbonnanotube modified electrodes for determination of NADH and fabrication of ethanol dehydrogenase-based biosensor. Biosens Bioelectron 2009; 25:733-8. [PMID: 19740647 DOI: 10.1016/j.bios.2009.08.016] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Revised: 07/29/2009] [Accepted: 08/11/2009] [Indexed: 11/27/2022]
Abstract
A single walled-carbon nanotube (SWNT) modified with poly brilliant cresyl blue (PBCB) glassy carbon electrode has been fabricated by a simple, method in order to facilitate electrocatalytic detection of NADH. At this chemically modified electrode, NADH was determined in neutral phosphate buffer solution at 0V (vs. SCE). The amperometric detection provided a wide linear current vs. concentration range (3.0-104.2 microM), a fast response time (within 5s), high sensitivity [9.89nA (muM)(-1)] and a low detection limit (1.0 microM, S/N=3). No interference was observed with a 100-fold excess of dopamine or uric acid. An ethanol biosensor also was developed using the nanocomposite modified electrode, by immobilizing ethanol dehydrogenase with carrageenan. In this case a linear ethanol concentration response was achieved in the range from 0.4 to 2.4mM and the detection limit was estimated to be 0.1mM (S/N=3). The analytical performance achieved with the of the PBCB/SWNT nanocomposite electrode is expected to the development of novel biosensors, biofuel cells, and other bioelectrochemical devices.
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Affiliation(s)
- Dong-Wei Yang
- Xiangfan University, Xiangfan, Huibei, 441053, China
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Wang P, Mai Z, Dai Z, Li Y, Zou X. Construction of Au nanoparticles on choline chloride modified glassy carbon electrode for sensitive detection of nitrite. Biosens Bioelectron 2009; 24:3242-7. [DOI: 10.1016/j.bios.2009.04.006] [Citation(s) in RCA: 132] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2009] [Revised: 03/20/2009] [Accepted: 04/06/2009] [Indexed: 11/25/2022]
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22
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Electrocatalytic Oxidation and Voltammetric Determination of Nitrite on Hydrophobic Ionic Liquid-Carbon Nanotube Gel-Chitosan Composite Modified Electrodes. ELECTROANAL 2008. [DOI: 10.1002/elan.200804288] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Chen X, Wang F, Chen Z. An electropolymerized Nile Blue sensing film-based nitrite sensor and application in food analysis. Anal Chim Acta 2008; 623:213-20. [PMID: 18620926 DOI: 10.1016/j.aca.2008.06.021] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2008] [Revised: 06/11/2008] [Accepted: 06/13/2008] [Indexed: 11/29/2022]
Abstract
This paper reports a poly-Nile Blue (PNB) sensing film based electrochemical sensor and the application in food analysis as a possible alternative for electrochemical detection of nitrite. The PNB-modified electrode in the sensor was prepared by in situ electropolymerization of Nile Blue at a prepolarized glassy carbon (GC) electrode and then characterized by cyclic voltammetry (CV) and pulse voltammetry in phosphate buffer (pH 7.1). Several key operational parameters affecting the electrochemical response of PNB sensing film were examined and optimized, such as polarization time, PNB film thickness and electrolyte pH values. As the electroactive PNB sensing film provides plenty of active sites for anodic oxidation of nitrite, the nitrite sensor exhibited high performance including high sensitivity, low detection limit, simple operation and good stability at the optimized conditions. The nitrite sensor revealed good linear behavior in the concentration range from 5.0x10(-7) mol L(-1) to 1.0x10(-4) mol L(-1) for the quantitative analysis of nitrite anion with a limit of detection of 1.0x10(-7) mol L(-1). Finally, the application in food analysis using sausage as testing samples was investigated and the results were consistent with those obtained by standard spectrophotometric method.
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Affiliation(s)
- Xiaowei Chen
- Department of Pharmaceutical Analysis, College of Pharmacy, Wuhan University, Wuhan 430072, China
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Affiliation(s)
- Benjamin J Privett
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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