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Nunez FA, Castro ACH, de Oliveira VL, Lima AC, Oliveira JR, de Medeiros GX, Sasahara GL, Santos KS, Lanfredi AJC, Alves WA. Electrochemical Immunosensors Based on Zinc Oxide Nanorods for Detection of Antibodies Against SARS-CoV-2 Spike Protein in Convalescent and Vaccinated Individuals. ACS Biomater Sci Eng 2023; 9:458-473. [PMID: 36048716 PMCID: PMC9469957 DOI: 10.1021/acsbiomaterials.2c00509] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 08/24/2022] [Indexed: 01/11/2023]
Abstract
Even after over 2 years of the COVID-19 pandemic, research on rapid, inexpensive, and accurate tests remains essential for controlling and avoiding the global spread of SARS-CoV-2 across the planet during a potential reappearance in future global waves or regional outbreaks. Assessment of serological responses for COVID-19 can be beneficial for population-level surveillance purposes, supporting the development of novel vaccines and evaluating the efficacy of different immunization programs. This can be especially relevant for broadly used inactivated whole virus vaccines, such as CoronaVac, which produced lower titers of neutralizing antibodies. and showed lower efficacy for specific groups such as the elderly and immunocompromised. We developed an impedimetric biosensor based on the immobilization of SARS-CoV-2 recombinant trimeric spike protein (S protein) on zinc oxide nanorod (ZnONR)-modified fluorine-doped tin oxide substrates for COVID-19 serology testing. Due to electrostatic interactions, the negatively charged S protein was immobilized via physical adsorption. The electrochemical response of the immunosensor was measured at each modification step and characterized by scanning electron microscopy and electrochemical techniques. We successfully evaluated the applicability of the modified ZnONR electrodes using serum samples from COVID-19 convalescent individuals, CoronaVac-vaccinated with or without positive results for SARS-CoV-2 infection, and pre-pandemic samples from healthy volunteers as controls. ELISA for IgG anti-SARS-CoV-2 spike protein was performed for comparison, and ELISA for IgG anti-RBDs of seasonal coronavirus (HCoVs) was used to test the specificity of immunosensor detection. No cross-reactivity with HCoVs was detected using the ZnONR immunosensor, and more interestingly, the sensor presented higher sensitivity when compared to negative ELISA results. The results demonstrate that the ZnONRs/spike-modified electrode displayed sensitive results for convalescents and vaccinated samples and shows excellent potential as a tool for the population's assessment and monitoring of seroconversion and seroprevalence.
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Affiliation(s)
- Freddy A. Nunez
- Centro de Ciências Naturais e Humanas,
Universidade Federal do ABC, Av. dos Estados, 5001, Santo
André, São Paulo09210-580, Brazil
| | - Ana C. H. Castro
- Centro de Ciências Naturais e Humanas,
Universidade Federal do ABC, Av. dos Estados, 5001, Santo
André, São Paulo09210-580, Brazil
| | - Vivian L. de Oliveira
- Centro de Ciências Naturais e Humanas,
Universidade Federal do ABC, Av. dos Estados, 5001, Santo
André, São Paulo09210-580, Brazil
- Laboratório de Imunologia, LIM19, Instituto do
Coração (InCor), Hospital das Clínicas da Faculdade de
Medicina da Universidade de São Paulo (HCFMUSP), Av. Dr. Arnaldo,
44, São Paulo, São Paulo05403-900, Brazil
| | - Ariane C. Lima
- Departamento de Clínica Médica, Disciplina
de Alergia e Imunologia Clínica, Faculdade de Medicina da Universidade
de São Paulo, Av. Dr. Arnaldo, 455, São Paulo, São
Paulo01246-903, Brazil
| | - Jamille R. Oliveira
- Departamento de Clínica Médica, Disciplina
de Alergia e Imunologia Clínica, Faculdade de Medicina da Universidade
de São Paulo, Av. Dr. Arnaldo, 455, São Paulo, São
Paulo01246-903, Brazil
| | - Giuliana X. de Medeiros
- Departamento de Clínica Médica, Disciplina
de Alergia e Imunologia Clínica, Faculdade de Medicina da Universidade
de São Paulo, Av. Dr. Arnaldo, 455, São Paulo, São
Paulo01246-903, Brazil
| | - Greyce L. Sasahara
- Laboratório de Imunologia, LIM19, Instituto do
Coração (InCor), Hospital das Clínicas da Faculdade de
Medicina da Universidade de São Paulo (HCFMUSP), Av. Dr. Arnaldo,
44, São Paulo, São Paulo05403-900, Brazil
| | - Keity S. Santos
- Laboratório de Imunologia, LIM19, Instituto do
Coração (InCor), Hospital das Clínicas da Faculdade de
Medicina da Universidade de São Paulo (HCFMUSP), Av. Dr. Arnaldo,
44, São Paulo, São Paulo05403-900, Brazil
- Departamento de Clínica Médica, Disciplina
de Alergia e Imunologia Clínica, Faculdade de Medicina da Universidade
de São Paulo, Av. Dr. Arnaldo, 455, São Paulo, São
Paulo01246-903, Brazil
| | - Alexandre J. C. Lanfredi
- Centro de Engenharia, Modelagem e Ciências
Sociais Aplicadas, Universidade Federal do ABC, Av. dos
Estados, 5001, Santo André, São Paulo09210-580,
Brazil
| | - Wendel A. Alves
- Centro de Ciências Naturais e Humanas,
Universidade Federal do ABC, Av. dos Estados, 5001, Santo
André, São Paulo09210-580, Brazil
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Li Y, Li H, Li G, Wang D, Wang S, Zhao X. Low-temperature N-anchored ordered Pt 3Co intermetallic nanoparticles as electrocatalysts for methanol oxidation reaction. NANOSCALE 2022; 14:14199-14211. [PMID: 36125088 DOI: 10.1039/d2nr04316e] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To enhance nanocatalyst performance and durability for the methanol oxidation reaction (MOR) in a direct methanol fuel cell, small-sized (2.1 nm) and structurally ordered Pt3Co intermetallic nanoparticles are uniformly anchored onto nitrogen-doped carbon nanotubes (N-CNTs) via a low-temperature N-anchoring method, and the N-doping abilities of different N-containing reagents are compared. After investigating the microstructure of Pt3Co/N-CNTs and evaluating their catalytic activity for the MOR, the results show that N-doping facilitates the uniform loading of Pt3Co NPs and plays a crucial role in improving the electrocatalytic activity of Pt3Co NPs supported on CNTs. Pt3Co/N-CNT-M with melamine as the N dopant exhibits the highest MOR activity and stability among all N-CNT-supported Pt3Co NPs and Pt/N-CNT-M. Density functional theory calculations suggest that the doping of N enhances the binding energy of CNTs to Pt3Co NPs, and the MOR mechanism shows that the introduction of Co is the reason for the enhancement of MOR reaction kinetics. The excellent electrochemical performance of Pt3Co/N-CNT-M is mainly attributed to the synergistic effect of N and Pt3Co intermetallic nanoparticles. The combination of ordered alloy nanoparticles and high-performance carrier N-CNT-M described herein exhibits great potential for fuel cells and may provide an unequivocal direction for the optimization of catalyst performance.
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Affiliation(s)
- Yanru Li
- School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China.
- Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou, 730050, China
| | - Hongwei Li
- School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China.
- Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou, 730050, China
| | - Guixian Li
- School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China.
- Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou, 730050, China
| | - Dongliang Wang
- School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China.
- Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou, 730050, China
| | - Shoudeng Wang
- School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China.
- Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou, 730050, China
| | - Xinhong Zhao
- School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China.
- Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou, 730050, China
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Voltammetric estimation of residual nitroxynil in food products using carbon paste electrode. Sci Rep 2022; 12:14289. [PMID: 35995815 PMCID: PMC9395526 DOI: 10.1038/s41598-022-18305-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 08/09/2022] [Indexed: 11/11/2022] Open
Abstract
A simple and sensitive voltammetric method was developed and validated for the recognition of the veterinary drug nitroxynil (NTX). The method is based on studying its voltammetric behavior at a carbon paste electrode. Square wave voltammetry (SWV) was successfully applied in this study. The anodic peak current obtained was a linear function of NTX concentration in Britton Robinson buffer of pH 3 over the range of 3.9 × 10–6–1.0 × 10−4 M with lower detection and quantitation limits of 3.1 × 10–7 and 9.4 × 10–7 M, respectively. The proposed method was first applied to the assessment of the drug in commercial vials. The method was further used to monitor the residual amounts of the drug in bovine meat, kidney, fat, and milk samples. The results obtained were favourably compared with those given by reference method. The interference likely to be introduced by co-administered drugs was evaluated. The electrode reaction was elucidated, and electron transfer kinetics were studied.
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Jiwanti PK, Wardhana BY, Sutanto LG, Chanif MF. A Review on Carbon‐based Electrodes for Electrochemical Sensor of Quinolone Antibiotics. ChemistrySelect 2022. [DOI: 10.1002/slct.202103997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Prastika K. Jiwanti
- Nanotechnology Engineering Faculty of Advanced Technology and Multidiscipline Universitas Airlangga Surabaya 60115 Indonesia
| | - Brasstira Y. Wardhana
- Nanotechnology Engineering Faculty of Advanced Technology and Multidiscipline Universitas Airlangga Surabaya 60115 Indonesia
| | - Laurencia G. Sutanto
- Nanotechnology Engineering Faculty of Advanced Technology and Multidiscipline Universitas Airlangga Surabaya 60115 Indonesia
| | - Muchammad F. Chanif
- Nanotechnology Engineering Faculty of Advanced Technology and Multidiscipline Universitas Airlangga Surabaya 60115 Indonesia
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