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Hui Y, Yang D, Wei L, Pu M, Mao Y, Chen X, Wang B. Rapid and label-free electrochemical aptasensor based on a palladium nanoparticles/titanium carbide/polyethyleneimine functionalized nitrogen-doped carbon nanotubes composite for amplified detection of streptomycin. Food Chem 2024; 432:137271. [PMID: 37651787 DOI: 10.1016/j.foodchem.2023.137271] [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: 05/16/2023] [Revised: 08/19/2023] [Accepted: 08/22/2023] [Indexed: 09/02/2023]
Abstract
A novel electrochemical aptasensor for the determination of streptomycin (STR) was constructed in this work. We prepared a palladium nanoparticles/titanium carbide/polyethyleneimine-functionalized nitrogen-doped carbon nanotube (Pd@Ti3C2-PEI-NCNTs) composite via hydrothermal-assisted formic acid reduction and employed it as a substrate material for anchoring a NH2-functionalized aptamer (Apt) to the surface of an electrode through the Pd-N bond. The Pd@Ti3C2-PEI-NCNTs composite increased the electrochemically active surface area and conductivity of the electrode, achieving substantial signal amplification (1.87 times). The constructed aptasensor demonstrated accurate STR detection via specific recognition between the Apt and STR, with a detection range and limit of 0.01-700 and 0.003 nmol/L, respectively. The aptasensor also exhibited excellent selectivity, stability, reproducibility, practicability and shorter assay times (60 min). Furthermore, molecular docking and molecular dynamic also elucidated the binding mechanism between the aptamer and STR molecules. Overall, this method is expected to be a helpful tool for detecting STR in food.
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Affiliation(s)
- Yuanyuan Hui
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
| | - Ding Yang
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
| | - Lusha Wei
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
| | - Meixue Pu
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
| | - Yazhou Mao
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
| | - Xiaoxia Chen
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
| | - Bini Wang
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, Shaanxi 710119, China; Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi'an, Shaanxi 710069, China.
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2
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Krukiewicz K, Czerwińska-Główka D, Turczyn RM, Blacha-Grzechnik A, Vallejo-Giraldo C, Erfurt K, Chrobok A, Faure-Vincent J, Pouget S, Djurado D, Biggs MJ. Flexible, Transparent, and Cytocompatible Nanostructured Indium Tin Oxide Thin Films for Bio-optoelectronic Applications. ACS APPLIED MATERIALS & INTERFACES 2023; 15:45701-45712. [PMID: 37737728 PMCID: PMC10561142 DOI: 10.1021/acsami.3c10861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 09/08/2023] [Indexed: 09/23/2023]
Abstract
Electrical stimulation has been used successfully for several decades for the treatment of neurodegenerative disorders, including motor disorders, pain, and psychiatric disorders. These technologies typically rely on the modulation of neural activity through the focused delivery of electrical pulses. Recent research, however, has shown that electrically triggered neuromodulation can be further enhanced when coupled with optical stimulation, an approach that can benefit from the development of novel electrode materials that combine transparency with excellent electrochemical and biological performance. In this study, we describe an electrochemically modified, nanostructured indium tin oxide/poly(ethylene terephthalate) (ITO/PET) surface as a flexible, transparent, and cytocompatible electrode material. Electrochemical oxidation and reduction of ITO/PET electrodes in the presence of an ionic liquid based on d-glucopyranoside and bistriflamide units were performed, and the electrochemical behavior, conductivity, capacitance, charge transport processes, surface morphology, optical properties, and cytocompatibility were assessed in vitro. It has been shown that under selected conditions, electrochemically modified ITO/PET films remained transparent and highly conductive and were able to enhance neural cell survival and neurite outgrowth. Consequently, electrochemical modification of ITO/PET electrodes in the presence of an ionic liquid is introduced as an effective approach for tailoring the properties of ITO for advanced bio-optoelectronic applications.
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Affiliation(s)
- Katarzyna Krukiewicz
- Department
of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland
- Centre
for Organic and Nanohybrid Electronics, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Dominika Czerwińska-Główka
- Department
of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Roman Maria Turczyn
- Department
of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland
- Centre
for Organic and Nanohybrid Electronics, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Agata Blacha-Grzechnik
- Department
of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland
- Centre
for Organic and Nanohybrid Electronics, Silesian University of Technology, 44-100 Gliwice, Poland
| | | | - Karol Erfurt
- Department
of Chemical Organic Technology and Petrochemistry, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Anna Chrobok
- Department
of Chemical Organic Technology and Petrochemistry, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Jérôme Faure-Vincent
- CEA/INAC/SPrAM,
Laboratoire d’Electronique Moléculaire Organique et
Hybride, 38000 Grenoble, France
| | - Stéphanie Pouget
- CEA/INAC/SPrAM,
Laboratoire d’Electronique Moléculaire Organique et
Hybride, 38000 Grenoble, France
| | - David Djurado
- CEA/INAC/SPrAM,
Laboratoire d’Electronique Moléculaire Organique et
Hybride, 38000 Grenoble, France
| | - Manus J.P. Biggs
- Centre
for Research in Medical Devices, University
of Galway, H91 TK33 Galway, Ireland
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3
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Zambry NS, Awang MS, Beh KK, Hamzah HH, Bustami Y, Obande GA, Khalid MF, Ozsoz M, Manaf AA, Aziah I. A label-free electrochemical DNA biosensor used a printed circuit board gold electrode (PCBGE) to detect SARS-CoV-2 without amplification. LAB ON A CHIP 2023; 23:1622-1636. [PMID: 36786757 DOI: 10.1039/d2lc01159j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The emergence of coronavirus disease 2019 (COVID-19) motivates continuous efforts to develop robust and accurate diagnostic tests to detect severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). Detection of viral nucleic acids provides the highest sensitivity and selectivity for diagnosing early and asymptomatic infection because the human immune system may not be active at this stage. Therefore, this work aims to develop a label-free electrochemical DNA biosensor for SARS-CoV-2 detection using a printed circuit board-based gold substrate (PCBGE). The developed sensor used the nucleocapsid phosphoprotein (N) gene as a biomarker. The DNA sensor-based PCBGE was fabricated by self-assembling a thiolated single-stranded DNA (ssDNA) probe onto an Au surface, which performed as the working electrode (WE). The Au surface was then treated with 6-mercapto-1-hexanol (MCH) before detecting the target N gene to produce a well-oriented arrangement of the immobilized ssDNA chains. The successful fabrication of the biosensor was characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and atomic force microscopy (AFM). The DNA biosensor performances were evaluated using a synthetic SARS-CoV-2 genome and 20 clinical RNA samples from healthy and infected individuals through EIS. The developed DNA biosensor can detect as low as 1 copy per μL of the N gene within 5 minutes with a LOD of 0.50 μM. Interestingly, the proposed DNA sensor could distinguish the expression of SARS-CoV-2 RNA in a patient diagnosed with COVID-19 without any amplification technique. We believe that the proposed DNA sensor platform is a promising point-of-care (POC) device for COVID-19 viral infection since it offers a rapid detection time with a simple design and workflow detection system, as well as an affordable diagnostic assay.
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Affiliation(s)
- Nor Syafirah Zambry
- Institute for Research in Molecular Medicine (INFORMM), Health Campus, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia.
| | - Mohd Syafiq Awang
- Collaborative Microelectronic Design Excellence Center (CEDEC), Universiti Sains Malaysia, Sains@USM, Level 1, Block C, No. 10 Persiaran Bukit Jambul, 11900 Bayan Lepas, Pulau Pinang, Malaysia.
| | - Khi Khim Beh
- Collaborative Microelectronic Design Excellence Center (CEDEC), Universiti Sains Malaysia, Sains@USM, Level 1, Block C, No. 10 Persiaran Bukit Jambul, 11900 Bayan Lepas, Pulau Pinang, Malaysia.
| | - Hairul Hisham Hamzah
- School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia.
| | - Yazmin Bustami
- School of Biological Sciences, Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia
| | - Godwin Attah Obande
- Department of Medical Microbiology and Parasitology, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia
- Department of Microbiology, Faculty of Science, Federal University of Lafia, Lafia, Nasarawa State, Nigeria
| | - Muhammad Fazli Khalid
- Institute for Research in Molecular Medicine (INFORMM), Health Campus, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia.
| | - Mehmet Ozsoz
- Institute for Research in Molecular Medicine (INFORMM), Health Campus, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia.
- Department of Biomedical Engineering, Faculty of Engineering, Near East University, 99138 Nicosia, Turkey
| | - Asrulnizam Abd Manaf
- Collaborative Microelectronic Design Excellence Center (CEDEC), Universiti Sains Malaysia, Sains@USM, Level 1, Block C, No. 10 Persiaran Bukit Jambul, 11900 Bayan Lepas, Pulau Pinang, Malaysia.
| | - Ismail Aziah
- Institute for Research in Molecular Medicine (INFORMM), Health Campus, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia.
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Khownarumit P, Choosang K, Poo-arporn RP, Poo-arporn Y, Chanlek N, Surareungchai W. Bio-Electroanalysis Performance of Heme Redox-Center for π- π Interaction Bonding of a Methylene Blue-Graphene Modified Electrode. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:745. [PMID: 36839114 PMCID: PMC9963319 DOI: 10.3390/nano13040745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/08/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
Hemeprotein detection has motivated extensive research on the direct reaction of a heme molecule and a redox dye. The present study used methylene blue as both donor and acceptor for a redox reaction. First, the solid phases of methylene blue (MB) and graphene (GP) formed a π-π interaction bond at the aromatic rings. The conductivity of GP was better than that of carbon in a carbon electrode (CE). Then, the working CE was modified using strong adsorption of MB/GP on the electrode surface. The surface of the electrode was investigated using a modified and an unmodified electrode. The electrode's properties were studied using voltammograms of redox couple K3[Fe(CN)6]3-/4-. Its reaction was used to find the active area of the modified electrode, which was 1.76 times bigger than that of the unmodified electrode. The surface coverage values of the modified and unmodified electrodes were 8.17 × 10-6 and 1.53 × 10-5 mol/cm2, respectively. This research also studied the application of hemeprotein detection. Hemoglobin (Hb), myoglobin (Mb), and cytochrome c (Cyt. C) were studied by the reaction of Fe (III/II) at the heme-redox center. The electrocatalytic reaction between MB/GP and hemeproteins produced an anodic peak at 0.35 V for Hb, Mb, and Cyt. C. This nanohybrid film enhanced electron transfer between protein molecules and the modified carbon electrode. The amperometric measurements show that the limit of detection was 0.2 µM, 0.3 µM, and 0.1 µM for Hb, Mb, and Cyt. C, respectively. The measurement spanned a linear range of 0.2 µM to 5 µM, 0.3 µM to 5 µM, and 0.1 µM to 0.7 µM for Hb, Mb, and Cyt. C, respectively. Hb showed the lowest sensitivity compared with Mb and Cyt. C due to the role of steric hindrance in the hemeprotein specificity structure. This study offers a simple and efficient fabrication platform for electrochemical sensors for hemeproteins. When compared to other complex immobilization processes, the fabrication method for this sensor has many benefits, including no need for special chemicals and easy preparation and electrode modification-both of which are crucial for the development of electrochemical sensing devices.
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Affiliation(s)
- Porntip Khownarumit
- Sensor Technology Laboratory, Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok 10150, Thailand
| | - Kanmanee Choosang
- Sensor Technology Laboratory, Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok 10150, Thailand
| | - Rungtiva P. Poo-arporn
- Biological Engineering Program, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
| | - Yingyot Poo-arporn
- Synchrotron Research and Applications Division, Synchrotron Light Research Institute, 111 University Avenue, Nakhon Ratchasima 30000, Thailand
| | - Narong Chanlek
- Synchrotron Research and Applications Division, Synchrotron Light Research Institute, 111 University Avenue, Nakhon Ratchasima 30000, Thailand
| | - Werasak Surareungchai
- Faculty of Science and Nanoscience & Nanotechnology Graduate Program, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
- Bangkhuntein Campus, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok 10150, Thailand
- Analytical Sciences and National Doping Test Institute, Mahidol University, Bangkok 10400, Thailand
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5
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Anand P, Verma A, Hong YA, Hu A, Jaihindh DP, Wong MS, Fu YP. Morphological and elemental tuning of BiOCl/BiVO 4 heterostructure for uric acid electrochemical sensor and antibiotic photocatalytic degradation. CHEMOSPHERE 2023; 310:136847. [PMID: 36241103 DOI: 10.1016/j.chemosphere.2022.136847] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 09/27/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
Deep eutectic solvents (DES) consisting of EG-(ChCl: C2H6O2) and TU-(ChCl: CH4N2S) assisted synthesized BiOCl/BiVO4 heterostructured catalyst studied for electrochemical uric acid (UA) sensor and tetracycline photocatalytic degradation. The chemical composition of the BiOCl/BiVO4 catalyst was analyzed by X-ray photoelectron spectroscopy (XPS). UV-vis spectroscopy reveals increased absorption of visible light till the near-infrared region, which results in a narrowing of band gap energy from 2.3 eV to 2.2 eV for BiOCl/BiVO4-TU. Morphology of catalyst analyzed using field-emission scanning electron microscope (FE-SEM) and Transmission electron microscope (TEM) technique. Time-Resolved photoluminescence (TRPL) confirms an increased lifetime of e-/h+ pair after heterostructure formation. The catalyst-modified glassy carbon electrode shows selectivity toward the detection of uric acid (UA). The limit of detection (LOD) is estimated to be 0.04688 μM for UA; also, interference and stability of catalyst were studied. Photocatalytic activity of the synthesized catalyst was investigated by degrading tetracycline (TC) antibiotic pollutants, and their intermediate product was analyzed by ion trap mass spectrometry (MS).
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Affiliation(s)
- Pandiyarajan Anand
- Department of Materials Science and Engineering, National Dong Hwa University, Shou-Feng, Hualien, 97401, Taiwan
| | - Atul Verma
- Department of Materials Science and Engineering, National Dong Hwa University, Shou-Feng, Hualien, 97401, Taiwan
| | - Yi-An Hong
- Institute of Medical Sciences, Tzu-Chi University, Hualien, 97002, Taiwan
| | - Anren Hu
- Institute of Medical Sciences, Tzu-Chi University, Hualien, 97002, Taiwan; Department of Laboratory Medicine and Biotechnology, Tzu-Chi University, Hualien, 97004, Taiwan
| | | | - Ming-Show Wong
- Department of Materials Science and Engineering, National Dong Hwa University, Shou-Feng, Hualien, 97401, Taiwan.
| | - Yen-Pei Fu
- Department of Materials Science and Engineering, National Dong Hwa University, Shou-Feng, Hualien, 97401, Taiwan.
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6
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Near to neutral pH all-iron redox flow battery based on environmentally compatible coordination compounds. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Diclofenac determination using CeO2 nanoparticle modified screen-printed electrodes – A study of background correction. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105258] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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8
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Güney S, Arslan T, Yanık S, Güney O. An Electrochemical Sensing Platform Based on Graphene Oxide and Molecularly Imprinted Polymer Modified Electrode for Selective Detection of Amoxicillin. ELECTROANAL 2020. [DOI: 10.1002/elan.202060129] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Sevgi Güney
- Department of Chemistry Istanbul Technical University 34469, Maslak Istanbul Turkey
| | - Taner Arslan
- Department of Chemistry Istanbul Technical University 34469, Maslak Istanbul Turkey
| | - Serhat Yanık
- Department of Metallurgical and Materials Engineering Marmara University, Kadıkoy Istanbul 34722 Turkey
| | - Orhan Güney
- Department of Chemistry Istanbul Technical University 34469, Maslak Istanbul Turkey
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9
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Giaccherini A, Al Khatib M, Cinotti S, Piciollo E, Berretti E, Giusti P, Innocenti M, Montegrossi G, Lavacchi A. Analysis of mass transport in ionic liquids: a rotating disk electrode approach. Sci Rep 2020; 10:13433. [PMID: 32778683 PMCID: PMC7417597 DOI: 10.1038/s41598-020-70301-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 06/10/2020] [Indexed: 11/16/2022] Open
Abstract
Ionic Liquids are a promising alternative to water electrolytes for the electrodeposition of metals. These solvents have a much larger electrochemical window than water that expands the potential of electrodeposition. However, mass transport in Ionic Liquids is slow. The slow mass transport dramatically affects the rate of reactions at the solid-liquid interface, hampering the exploitation of Ionic Liquids in high-throughput electrodeposition processes. In this paper, we clarify the origin of such poor mass transport in the diffusion-advection (convection) regime. To determine the extent and the dynamics of the convection boundary layers, we performed Rotating Disk Electrode (RDE) experiments on model reactions along with the finite element simulation. Both the experiments and the finite element modelling showed the occurrence of peaks in the RDE curves even at relatively high rotation rates (up to 2000 rpm). The peak in the RDE is the fingerprint of partial diffusion control that happens for the relative extent of the diffusion and convection boundary layers. In looking for a close match between the experiments and the simulations, we found that the ohmic drop plays a critical role and must be considered in the calculation to find the best match with the experimental data. In the end, we have shown that the combined approach consisting of RDE experiments and finite elements modelling providing a tool to unravel of the structure of the diffusion and convection boundary layers both in dynamic and stationary conditions.
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Affiliation(s)
- Andrea Giaccherini
- Dipartimento di Ingegneria Industriale, Università Degli Studi di Firenze, Via Santa Marta 3, 50139, Firenze, Italy
- Dipartimento di Chimica, Università Degli Studi di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, FI, Italy
| | - Maher Al Khatib
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università degli Studi di Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Serena Cinotti
- Dipartimento di Chimica, Università Degli Studi di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, FI, Italy
| | | | - Enrico Berretti
- CNR, Istituto per la Chimica dei Composti Organometallici (ICCOM), Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Paolo Giusti
- CDR S.R.L., Via degli Artigiani, 6, 50055, Ginestra Fiorentina, FI, Italy
| | - Massimo Innocenti
- Dipartimento di Chimica, Università Degli Studi di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, FI, Italy
| | - Giordano Montegrossi
- CNR, Istituto di Geoscienze e Georisorse (IGG), Via La Pira 4, 50121, Firenze, FI, Italy
| | - Alessandro Lavacchi
- CNR, Istituto per la Chimica dei Composti Organometallici (ICCOM), Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy.
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10
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Ozoemena O, Maphumulo T, Shai JL, Ozoemena KI. Electrospun Carbon Nanofibers as an Electrochemical Immunosensing Platform for Vibrio cholerae Toxin: Aging Effect of the Redox Probe. ACS OMEGA 2020; 5:5762-5771. [PMID: 32226855 PMCID: PMC7097905 DOI: 10.1021/acsomega.9b03820] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Accepted: 02/18/2020] [Indexed: 06/01/2023]
Abstract
An electrochemical immunosensor for Vibrio cholerae toxin (VCT) has been developed using electrospun carbon nanofibers (CNFs) as the electrode platform. To fabricate the immunosensor, the anti-cholera toxin antibody (Ab) was covalently immobilized on the electrode platforms using the carbodiimide chemistry for the amide bond formation. Every step of the formation of the immunosensor and the subsequent binding of the VCT subunit antigen (Ag) was electrochemically interrogated. The immunosensor gave excellent reproducibility and sensitivities: limits of detection (ca. 1.2 × 10-13 g mL-1), limits of quantification (ca. 1.3 × 10-13 g mL-1), and a wide linear range for the anti-cholera detection of 8 orders of magnitude (10-13 to 10-5 g mL-1). One of the key findings was the enhanced sensitivity of the VCT detection using aged rather than the freshly prepared redox probe, described here as Redox Probe Aging-Induced Sensitivity Enhancement ("Redox-PrAISE"). The Redox-PrAISE was found more useful in the real application of these immunosensors, showing comparable or even better sensitivity for eight real cholera-infested water samples than the conventional clinical culture method. This immunosensor shows promise for the potential development of point-of-care diagnosis of VCT. Importantly, this study highlights the importance of considering the nature of the redox probe on the electrochemical sensing conditions when designing impedimetric immunosensors.
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Affiliation(s)
- Okoroike
C. Ozoemena
- Department
of Biomedical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
- Department
of Chemistry, University of Pretoria, Pretoria 0002, South Africa
| | - Tobile Maphumulo
- Molecualr
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Jerry L. Shai
- Department
of Biomedical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Kenneth I. Ozoemena
- Department
of Chemistry, University of Pretoria, Pretoria 0002, South Africa
- Molecualr
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
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11
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Kelly A, Farid N, Krukiewicz K, Belisle N, Groarke J, Waters EM, Trotier A, Laffir F, Kilcoyne M, O'Connor GM, Biggs MJ. Laser-Induced Periodic Surface Structure Enhances Neuroelectrode Charge Transfer Capabilities and Modulates Astrocyte Function. ACS Biomater Sci Eng 2020; 6:1449-1461. [PMID: 33455378 DOI: 10.1021/acsbiomaterials.9b01321] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The brain machine interface (BMI) describes a group of technologies capable of communicating with excitable nervous tissue within the central nervous system (CNS). BMIs have seen major advances in recent years, but these advances have been impeded because of a temporal deterioration in the signal to noise ratio of recording electrodes following insertion into the CNS. This deterioration has been attributed to an intrinsic host tissue response, namely, reactive gliosis, which involves a complex series of immune mediators, resulting in implant encapsulation via the synthesis of pro-inflammatory signaling molecules and the recruitment of glial cells. There is a clinical need to reduce tissue encapsulation in situ and improve long-term neuroelectrode functionality. Physical modification of the electrode surface at the nanoscale could satisfy these requirements by integrating electrochemical and topographical signals to modulate neural cell behavior. In this study, commercially available platinum iridium (Pt/Ir) microelectrode probes were nanotopographically functionalized using femto/picosecond laser processing to generate laser-induced periodic surface structures (LIPSS). Three different topographies and their physical properties were assessed by scanning electron microscopy and atomic force microscopy. The electrochemical properties of these interfaces were investigated using electrochemical impedance spectroscopy and cyclic voltammetry. The in vitro response of mixed cortical cultures (embryonic rat E14/E17) was subsequently assessed by confocal microscopy, ELISA, and multiplex protein array analysis. Overall LIPSS features improved the electrochemical properties of the electrodes, promoted cell alignment, and modulated the expression of multiple ion channels involved in key neuronal functions.
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Affiliation(s)
- Adriona Kelly
- Centre for Research in Medical Devices, National University of Ireland, Galway H91 TK33, Ireland
| | - Nazar Farid
- National Centre for Laser Applications, School of Physics, National University of Ireland, Galway H91 TK33, Ireland
| | - Katarzyna Krukiewicz
- Centre for Research in Medical Devices, National University of Ireland, Galway H91 TK33, Ireland.,Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, Gliwice 44-100, Poland
| | - Nicole Belisle
- Centre for Research in Medical Devices, National University of Ireland, Galway H91 TK33, Ireland
| | - John Groarke
- Centre for Research in Medical Devices, National University of Ireland, Galway H91 TK33, Ireland
| | - Elaine M Waters
- Glycosciences School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Alexandre Trotier
- Centre for Research in Medical Devices, National University of Ireland, Galway H91 TK33, Ireland
| | - Fathima Laffir
- Bernal Institute, Materials and Surface Science Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Michelle Kilcoyne
- Glycosciences School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Gerard M O'Connor
- Centre for Research in Medical Devices, National University of Ireland, Galway H91 TK33, Ireland.,National Centre for Laser Applications, School of Physics, National University of Ireland, Galway H91 TK33, Ireland
| | - Manus J Biggs
- Centre for Research in Medical Devices, National University of Ireland, Galway H91 TK33, Ireland
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12
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Electricity generation from untreated fresh digestate with a cost-effective array of floating microbial fuel cells. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2018.12.039] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Krukiewicz K, Janas D, Vallejo-Giraldo C, Biggs MJ. Self-supporting carbon nanotube films as flexible neural interfaces. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.10.157] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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14
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Güney S. Electrosynthesis of Molecularly Imprinted Poly‐o‐phenylenediamine on MWCNT Modified Electrode for Selective Determination of Meldonium. ELECTROANAL 2019. [DOI: 10.1002/elan.201800678] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Sevgi Güney
- Department of ChemistryIstanbul Technical University 34469, Maslak Istanbul Turkey
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15
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Huang B, Li N, Lin W, Li H. A highly ordered honeycomb-like nickel(III/II) oxide-enhanced photocatalytic fuel cell for effective degradation of bisphenol A. JOURNAL OF HAZARDOUS MATERIALS 2018; 360:578-586. [PMID: 30149344 DOI: 10.1016/j.jhazmat.2018.08.058] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 08/16/2018] [Accepted: 08/17/2018] [Indexed: 06/08/2023]
Abstract
The honeycomb-like nickel(III/II) oxide interpenetrated framework arrays labelled as H-NiOx are used as cathode catalysts for the degradation of bisphenol A (BPA) in visible light-excited fuel cells. The nanoparticle close-packed NiOx aggregates (C-NiOx) and H-NiOx are prepared by conventional electrodeposition (ED) and advanced oxidation-associated electrodeposition (AO-ED) strategies, carried out by multiple voltammetry controlled in the potential ranges of 0 to -1.3 V and 1.3 to -1.3 V (vs. SCE), respectively. Compared with C-NiOx, the H-NiOx frameworks with smaller charge transfer resistance and higher surface-confined redox-active centers exhibit larger cathode electrocatalytic activity for the photocatalytic degradation of BPA. The NaClO can act as a sacrificial agent to sustain the integrity and stability of H-NiOx cathode. The H-NiOx-assisted BPA degradation conditions are optimized by changing process variables. The BPA is degraded by 48.5% within 120 min in photocatalytic BPA (1.0 mmol L-1, pH 13) fuel cell employing H-NiOx cathode, CdS/TiO2 photoanode and 0.2 mol L-1 NaClO catholyte, and its degradation rate conforms to the first-order reaction kinetic model. The H-NiOx can remarkably enhance the performances of the photocatalytic fuel cell, achieving a 4.1-fold or 15.2-fold increase in the short circuit current and maximum power density compared with that using bare cathode.
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Affiliation(s)
- Bin Huang
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
| | - Nanxi Li
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
| | - Weiliang Lin
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China
| | - Hong Li
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
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16
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Krukiewicz K, Krzywiecki M, Biggs MJP, Janas D. Chirality-sorted carbon nanotube films as high capacity electrode materials. RSC Adv 2018; 8:30600-30609. [PMID: 35546838 PMCID: PMC9085468 DOI: 10.1039/c8ra03963a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 08/18/2018] [Indexed: 11/21/2022] Open
Abstract
Carbon nanomaterials show great promise for a wide range of applications due to their excellent physicochemical and electrical properties. Since their discovery, the state-of-the-art has expanded the scope of their application from scientific curiosity to impactful solutions. Due to their tunability, carbon nanomaterials can be processed into a wide range of formulations and significant scope exists to couple carbon structures to electronic and electrochemical applications. In this paper, the electrochemical performance of various types of CNT films, which differ by the number of walls, diameter, chirality and surface chemistry is presented. Especially, chirality-sorted (6,5)- and (7,6)-based CNT films are shown to possess a high charge storage capacity (up to 621.91 mC cm-2), areal capacitance (262 mF cm-2), significantly increased effective surface area and advantageous charge/discharge characteristics without addition of any external species, and outperform many other high capacity materials reported in the literature. The results suggest that the control over the CNT structure can lead to the manufacture of macroscopic CNT devices precisely tailored for a wide range of applications, with the focus on energy storage devices and supercapacitors. The sorted CNT macroassemblies show great potential for energy storage technologies to come from R&D laboratories into real life.
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Affiliation(s)
- Katarzyna Krukiewicz
- CÚRAM - Centre for Research in Medical Devices, National University of Ireland 118 Corrib Village Galway Ireland
- Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology M. Strzody 9 44-100 Gliwice Poland
| | - Maciej Krzywiecki
- Institute of Physics - CSE, Silesian University of Technology Konarskiego 22B 44-100 Gliwice Poland
| | - Manus J P Biggs
- CÚRAM - Centre for Research in Medical Devices, National University of Ireland 118 Corrib Village Galway Ireland
| | - Dawid Janas
- Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Silesian University of Technology B. Krzywoustego 4 44-100 Gliwice Poland +48 32 2371082
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17
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Vallejo-Giraldo C, Krukiewicz K, Calaresu I, Zhu J, Palma M, Fernandez-Yague M, McDowell B, Peixoto N, Farid N, O'Connor G, Ballerini L, Pandit A, Biggs MJP. Attenuated Glial Reactivity on Topographically Functionalized Poly(3,4-Ethylenedioxythiophene):P-Toluene Sulfonate (PEDOT:PTS) Neuroelectrodes Fabricated by Microimprint Lithography. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1800863. [PMID: 29862640 DOI: 10.1002/smll.201800863] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 04/17/2018] [Indexed: 06/08/2023]
Abstract
Following implantation, neuroelectrode functionality is susceptible to deterioration via reactive host cell response and glial scar-induced encapsulation. Within the neuroengineering community, there is a consensus that the induction of selective adhesion and regulated cellular interaction at the tissue-electrode interface can significantly enhance device interfacing and functionality in vivo. In particular, topographical modification holds promise for the development of functionalized neural interfaces to mediate initial cell adhesion and the subsequent evolution of gliosis, minimizing the onset of a proinflammatory glial phenotype, to provide long-term stability. Herein, a low-temperature microimprint-lithography technique for the development of micro-topographically functionalized neuroelectrode interfaces in electrodeposited poly(3,4-ethylenedioxythiophene):p-toluene sulfonate (PEDOT:PTS) is described and assessed in vitro. Platinum (Pt) microelectrodes are subjected to electrodeposition of a PEDOT:PTS microcoating, which is subsequently topographically functionalized with an ordered array of micropits, inducing a significant reduction in electrode electrical impedance and an increase in charge storage capacity. Furthermore, topographically functionalized electrodes reduce the adhesion of reactive astrocytes in vitro, evident from morphological changes in cell area, focal adhesion formation, and the synthesis of proinflammatory cytokines and chemokine factors. This study contributes to the understanding of gliosis in complex primary mixed cell cultures, and describes the role of micro-topographically modified neural interfaces in the development of stable microelectrode interfaces.
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Affiliation(s)
- Catalina Vallejo-Giraldo
- CÚRAM-Centre for Research in Medical Devices-Galway, Biosciences Research Building, 118 Corrib Village, Newcastle, Galway, H91 D577, Ireland
| | - Katarzyna Krukiewicz
- CÚRAM-Centre for Research in Medical Devices-Galway, Biosciences Research Building, 118 Corrib Village, Newcastle, Galway, H91 D577, Ireland
- Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, Gliwice, 44-100, Poland
| | - Ivo Calaresu
- Scuola Internazionale Superiore di Studi Avanzati (SISSA), Via Bonomea, 265, 34136, Trieste, Italy
| | - Jingyuan Zhu
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London, E14NS, UK
| | - Matteo Palma
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London, E14NS, UK
| | - Marc Fernandez-Yague
- CÚRAM-Centre for Research in Medical Devices-Galway, Biosciences Research Building, 118 Corrib Village, Newcastle, Galway, H91 D577, Ireland
| | - BenjaminW McDowell
- Department of Electrical and Computer Engineering, George Mason University, 4400 University Drive, MS-1G5 Fairfax, VA, 22030, USA
| | - Nathalia Peixoto
- Department of Electrical and Computer Engineering, George Mason University, 4400 University Drive, MS-1G5 Fairfax, VA, 22030, USA
| | - Nazar Farid
- School of Physics, National University of Ireland, Galway, University Road, Galway, H91 CF50, Ireland
| | - Gerard O'Connor
- School of Physics, National University of Ireland, Galway, University Road, Galway, H91 CF50, Ireland
| | - Laura Ballerini
- Scuola Internazionale Superiore di Studi Avanzati (SISSA), Via Bonomea, 265, 34136, Trieste, Italy
| | - Abhay Pandit
- CÚRAM-Centre for Research in Medical Devices-Galway, Biosciences Research Building, 118 Corrib Village, Newcastle, Galway, H91 D577, Ireland
| | - Manus Jonathan Paul Biggs
- CÚRAM-Centre for Research in Medical Devices-Galway, Biosciences Research Building, 118 Corrib Village, Newcastle, Galway, H91 D577, Ireland
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18
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Yildiz G, Aydogmus Z, Cinar ME, Senkal F, Ozturk T. Electrochemical oxidation mechanism of eugenol on graphene modified carbon paste electrode and its analytical application to pharmaceutical analysis. Talanta 2017; 173:1-8. [PMID: 28602182 DOI: 10.1016/j.talanta.2017.05.056] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 05/15/2017] [Accepted: 05/20/2017] [Indexed: 01/29/2023]
Abstract
Electrochemical properties of eugenol were investigated on a graphene modified carbon paste electrode (CPE) by using voltammetric methods, which exhibited a well-defined irreversible peak at about 0.7V vs Ag/AgCl, NaCl (3M) in Britton-Robinson buffer at pH 2.0. Mechanism of the electrochemical reaction of eugenol was studied by performing density functional theory (DFT) computations and mass spectroscopic analysis. (CPCM:water)-wB97XD/aug-cc-PVTZ//(CPCM:water)-wB97XD/6-31G(d) level calculations predicted that the formation of product P2, possessing a para-quinoid structure, is preferred rather than the product P1, suggested in the literature, having an ortho-quinoid system. Determination of eugenol in a pharmaceutical sample was realized in the light of the electrochemical findings, and a validated voltammetric method for quantitative analysis of eugenol in a pharmaceutical formulation was proposed. The differential pulse voltammogram (DPV) peak currents were found to be linear in the concentration range of 1.0 × 10-7 to 1.7 × 10-5M. The limit of detection (LOD) and the limit of quantification (LOQ) were obtained to be 7.0 × 10-9 and 2.3 × 10-8, respectively.
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Affiliation(s)
- Gulcemal Yildiz
- Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, Maslak, Istanbul 34469, Turkey.
| | - Zeynep Aydogmus
- Department of Analytical Chemistry, Faculty of Pharmacy, Istanbul University, Beyazıt, 34116 Istanbul, Turkey
| | - M Emin Cinar
- Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, Maslak, Istanbul 34469, Turkey; Department Chemie-Biologie, OC1, Universität Siegen, Adolf-Reichwein-Str., 57068 Siegen, Germany
| | - Filiz Senkal
- Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, Maslak, Istanbul 34469, Turkey
| | - Turan Ozturk
- Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, Maslak, Istanbul 34469, Turkey; Chemistry Group Laboratories, TUBITAK UME, PO Box 54, 41470 Gebze, Kocaeli, Turkey.
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19
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Mondal S, Sangaranarayanan MV. Permselectivity and thickness-dependent ion transport properties of overoxidized polyaniline: a mechanistic investigation. Phys Chem Chem Phys 2016; 18:30705-30720. [PMID: 27791209 DOI: 10.1039/c6cp04975c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report here the permselectivity of overoxidized polyaniline obtained using anodic polarization of polyaniline on glassy carbon electrodes. The contrasting redox behavior of overoxidized polyaniline coated electrodes towards [Fe(CN)6]3- and [Ru(NH3)6]3+ has been analyzed using cyclic voltammetry, hydrodynamic voltammetry and electrochemical impedance spectroscopy. This permselectivity vis a vis anion exclusivity arises from the incorporation of counter anions rather than by the formation of new functional groups in the polymer upon overoxidation - as inferred from FT Raman and UV-Visible spectral data. The surface charges of the polymeric films are also deduced from the zeta potential analysis. The thickness-dependent anion exclusion behavior of overoxidized polyaniline is quantitatively interpreted using diffusion coefficient measurements with rotating disc electrodes. The mechanism pertaining to the non-trivial role of film thickness in influencing anion exclusion is confirmed by additional impedance spectroscopy carried out during the overoxidation of polyaniline.
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Affiliation(s)
- Subrata Mondal
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India.
| | - M V Sangaranarayanan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India.
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20
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Liu J, Lu S, Liang X, Gan Q, Wang Y, Li H. Photoelectrocatalytic oxidation of ascorbic acid and electrocatalytic reduction of dioxygen by polyaniline films for renewable energy conversion. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.01.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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21
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Abdel-Hamid R, Newair EF. Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:1104-12. [PMID: 27547628 PMCID: PMC4979647 DOI: 10.3762/bjnano.7.103] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 07/15/2016] [Indexed: 05/02/2023]
Abstract
A simple and sensitive poly(gallic acid)/multiwalled carbon nanotube modified glassy carbon electrode (PGA/MWCNT/GCE) electrochemical sensor was prepared for direct determination of the total phenolic content (TPC) as gallic acid equivalent. The GCE working electrode was electrochemically modified and characterized using scanning electron microscope (SEM), cyclic voltammetry (CV), chronoamperometry and chronocoulometry. It was found that gallic acid (GA) exhibits a superior electrochemical response on the PGA/MWCNT/GCE sensor in comparison with bare GCE. The results reveal that a PGA/MWCNT/GCE sensor can remarkably enhance the electro-oxidation signal of GA as well as shift the peak potentials towards less positive potential values. The dependence of peak current on accumulation potential, accumulation time and pH were investigated by square-wave voltammetry (SWV) to optimize the experimental conditions for the determination of GA. Using the optimized conditions, the sensor responded linearly to a GA concentration throughout the range of 4.97 × 10(-6) to 3.38 × 10(-5) M with a detection limit of 3.22 × 10(-6) M (S/N = 3). The fabricated sensor shows good selectivity, stability, repeatability and (101%) recovery. The sensor was successfully utilized for the determination of total phenolic content in fresh pomegranate juice without interference of ascorbic acid, fructose, potassium nitrate and barbituric acid. The obtained data were compared with the standard Folin-Ciocalteu spectrophotometric results.
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Affiliation(s)
- Refat Abdel-Hamid
- Unit of Electrochemistry Applications (UEA), Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
| | - Emad F Newair
- Unit of Electrochemistry Applications (UEA), Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
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22
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Shi X, Simpson DE, Roy D. The role of chemisorbed hydroxyl species in alkaline electrocatalysis of glycerol on gold. Phys Chem Chem Phys 2015; 17:11432-44. [PMID: 25855265 DOI: 10.1039/c5cp00313j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The mechanism of energy conversion in a direct glycerol fuel cell (DGFC) is governed by the anode supported heterogeneous steps of glycerol electro-oxidation. In aerated alkaline electrolytes, glycerol also participates in a base catalyzed process, which can release certain species mixing with the anode catalyzed surface products. As a result, selective probing of the surface catalytic reactions involving such systems can be difficult. The present work addresses this issue for a gold anode by using the analytical capability of cyclic voltammetry (CV). In addition, surface plasmon resonance measurements are used to optically probe the adsorption characteristics of the electrolyte species. The net exchange current of the oxidation process and the transfer coefficient of the rate determining step are evaluated by analyzing the CV data. The interfacial reactions and their products on Au are identified by measuring the number of electrons released during the electro-oxidation of glycerol. The results indicate that these reactions are facilitated by the surface bound hydroxyl species on Au (chemisorbed OH(-) and faradaically formed Au-OH). By comparing the findings for stationary and rotating electrodes, it is shown that, convective mass transport is critical to maintaining efficient progression of the consecutive oxidation steps of glycerol. In the absence of hydrodynamic support, the main surface products of glycerol oxidation appear to be glyceraldehyde, glycerate and malonate, formed through a net six-electron route. In the presence of controlled convection, a ten-electron process is activated, where mesaxolate is the likely additional product.
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Affiliation(s)
- X Shi
- Department of Physics, Clarkson University, Potsdam, New York 13699-5820, USA.
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23
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Batalla P, Martín A, López MÁ, González MC, Escarpa A. Enzyme-Based Microfluidic Chip Coupled to Graphene Electrodes for the Detection of D-Amino Acid Enantiomer-Biomarkers. Anal Chem 2015; 87:5074-8. [DOI: 10.1021/acs.analchem.5b00979] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Pilar Batalla
- Department of Analytical
Chemistry, Physical Chemistry and Chemical Engineering, Faculty of
Biology, Environmental Sciences and Chemistry, University of Alcalá, E-28871, Alcalá de Henares, Madrid, Spain
| | - Aída Martín
- Department of Analytical
Chemistry, Physical Chemistry and Chemical Engineering, Faculty of
Biology, Environmental Sciences and Chemistry, University of Alcalá, E-28871, Alcalá de Henares, Madrid, Spain
| | - Miguel Ángel López
- Department of Analytical
Chemistry, Physical Chemistry and Chemical Engineering, Faculty of
Biology, Environmental Sciences and Chemistry, University of Alcalá, E-28871, Alcalá de Henares, Madrid, Spain
| | - María Cristina González
- Department of Analytical
Chemistry, Physical Chemistry and Chemical Engineering, Faculty of
Biology, Environmental Sciences and Chemistry, University of Alcalá, E-28871, Alcalá de Henares, Madrid, Spain
| | - Alberto Escarpa
- Department of Analytical
Chemistry, Physical Chemistry and Chemical Engineering, Faculty of
Biology, Environmental Sciences and Chemistry, University of Alcalá, E-28871, Alcalá de Henares, Madrid, Spain
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24
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Microfluidic system for enzymeless electrochemical determination of inulin using catalytically active metal nanowires. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1384-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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25
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Photoelectrocatalytic oxidation of uric acid on a novel ruthenium(II) polypyridyl complex modified ZnO electrode for photo-stimulated fuel cells. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.05.061] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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26
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Martín A, Hernández-Ferrer J, Vázquez L, Martínez MT, Escarpa A. Controlled chemistry of tailored graphene nanoribbons for electrochemistry: a rational approach to optimizing molecule detection. RSC Adv 2014. [DOI: 10.1039/c3ra44235g] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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27
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García M, Escarpa A. Microchip electrophoresis-copper nanowires for fast and reliable determination of monossacharides in honey samples. Electrophoresis 2013; 35:425-32. [PMID: 24115078 DOI: 10.1002/elps.201300458] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 09/20/2013] [Accepted: 09/21/2013] [Indexed: 12/22/2022]
Abstract
Microchip electrophoresis (ME) with electrochemical detection has been demonstrated to be a powerful tool in food analysis. However, the coupling of ME with electrochemical detection and nanotechnologies is still in its infancy, knowing that nanomaterials can significantly improve the ME analytical performance. This work reports the coupling between ME and copper nanowires (CuNWs) for the selective analysis of monosaccharides in honey samples. Also, in terms of real applicability, the study of analytical reliability of ME is an issue of paramount importance. To this end, a representative group of nine honey samples were analyzed and the results were compared with those previously obtained by HPLC-refractive index. ME-CuNWs approach allowed the separation of glucose and fructose in <250 s under optimized separation (20 mM NaOH + 10 mM H3 BO3 , pH 12; separation voltage + 1000 V) and detection (E = +0.70 V in 20 mM NaOH + 10 mM H3 BO3 , pH 12) conditions. An excellent stability of EOF during sample analysis was achieved with RSDs for migration times <2% and for amperometric currents <9%. The quantitative contents for individual glucose and fructose obtained using ME-CuNWs in comparison with those obtained by HPLC-refractive index were highly in agreement with errors <10% indicating the reliability of the approach. The excellent analytical performance obtained confirms the analytical potency of ME-CuNWs approach, enhancing the maturity of the microchip technology and opening new avenues for future implementation of applications in the field of food analysis.
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Affiliation(s)
- Miguel García
- Department of Analytical Chemistry, Physical Chemistry, and Chemical Engineering, Faculty of Chemistry, University of Alcalá, Alcalá de Henares, Madrid, Spain
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28
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García M, Alonso-Fernández JR, Escarpa A. Copper Nanowires Immobilized on the Boards of Microfluidic Chips for the Rapid and Simultaneous Diagnosis of Galactosemia Diseases in Newborn Urine Samples. Anal Chem 2013; 85:9116-25. [DOI: 10.1021/ac402331v] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Miguel García
- Department
of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, E-28871, Alcalá de Henares, Madrid, Spain
| | - José Ramón Alonso-Fernández
- Laboratorio
de Metabolopatías, Departamento de Pediatría, Hospital Clínico (CHUS) and Universidade de Santiago de Compostela, Santiago de Compostela, Galicia, Spain
| | - Alberto Escarpa
- Department
of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, E-28871, Alcalá de Henares, Madrid, Spain
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29
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Wu JW, Mei WJ, Yan ZH, Liu JC, Li H. In situ spectroelectrochemical monitoring during the electrocatalytic oxidation of guanine on [Ru(bpy)2(MPyTMPP)Cl]+/ITO electrode. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.03.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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30
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Dickinson EJF, Limon-Petersen JG, Compton RG. The electroneutrality approximation in electrochemistry. J Solid State Electrochem 2011. [DOI: 10.1007/s10008-011-1323-x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Zelinskii AG. Peculiarities of mass transfer and natural convection in the redox system [Fe(CN)6]3−/[Fe(CN)6]4− with current flowing through a microorifice in insulating coating on the electrode. RUSS J ELECTROCHEM+ 2010. [DOI: 10.1134/s1023193510040087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Nowicka A, Donten M, Palys M, Van den Bossche B, Stojek Z. Voltammetric Studies of Parallel Electrode Processes Under Low Ionic Strength Conditions. Influence of Convection. ELECTROANAL 2006. [DOI: 10.1002/elan.200503452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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33
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Swaddle TW. Homogeneous versus Heterogeneous Self-Exchange Electron Transfer Reactions of Metal Complexes: Insights from Pressure Effects. Chem Rev 2005; 105:2573-608. [PMID: 15941222 DOI: 10.1021/cr030727g] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas W Swaddle
- Department of Chemistry, University of Calgary, Alberta, Canada.
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34
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Massari AM, Gurney RW, Schwartz CP, Nguyen ST, Hupp JT. Walljet electrochemistry: quantifying molecular transport through metallopolymeric and zirconium phosphonate assembled porphyrin square thin films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:4422-9. [PMID: 15969148 DOI: 10.1021/la049900+] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
By employing redox-active probes, condensed-phase molecular transport through nanoporous thin films can often be measured electrochemically. Certain kinds of electrode materials (e.g. conductive glass) are difficult to fabricate as rotatable disks or as ultramicroelectrodes-the configurations most often used for electrochemical permeation measurements. These limitations point to the need for a more materials-general measurement method. Herein, we report the application of walljet electrochemistry to the study of molecular transport through model metallopolymeric films on indium tin oxide electrodes. A quantitative expression is presented that describes the transport-limited current at the walljet electrode in terms of mass transport through solution and permeation through the film phase. A comparison of the film permeabilities for a series of redox probes measured using the walljet electrode and a rotating disk electrode establishes the accuracy of the walljet method, while also demonstrating similar precision for the two methods. We apply this technique to a system consisting of zirconium phosphonate assembled films of a porphyrinic molecular square. Transport through films comprising three or more layers is free from significant contributions from pinhole defects. Surprisingly, transport through films of this kind is 2-3 orders of magnitude slower than through films constructed via interfacial polymerization of nearly identical supramolecular square building blocks (Keefe; et al. Adv. Mater. 2003, 15, 1936). The zirconium phosphate assembled films show good size exclusion behavior. The details of the observed dependence of permeation rates on probe molecule size can be rationalized with a model that assumes that the walls of the squares are slightly tilted from a strictly vertical geometry, consistent with atomic force microscopy measurements, and assumes that the individual wall geometries are locked by rigid interlayer linkages.
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Affiliation(s)
- Aaron M Massari
- Department of Chemistry and the Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
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Bieniasz L. Use of dynamically adaptive grid techniques for the solution of electrochemical kinetic equations. Part 14: extension of the patch-adaptive strategy to time-dependent models involving migration–diffusion transport in one-dimensional space geometry, and its application to example transient experiments described by Nernst–Planck–Poisson equations. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2003.10.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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