Tallita Stéfanne e Silva, Guilherme Ramos Oliveira e Freitas, Lucas Franco Ferreira, Diego Leoni Franco
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引用次数: 0
Abstract
Respiratory syncytial virus (RSV) is responsible for outbreaks of bronchiolitis, bronchitis, and pneumonia and is effective and lethal in children under five years old. Current RSV detection methods are expensive, time-consuming, and require highly skilled personnel. Therefore, we developed a cost-effective impedimetric immunosensor for the detection of RSV based on a pencil graphite electrode (PGE) modified with a polymeric film derived from 3-amino phenylacetic acid. The current responses in the potassium ferricyanide and methylene blue solutions suggest the presence of unchanged carboxylic acid groups in the polymer. With a similar number of electrons involved in the first step of the reaction and electron/proton ratio to those proposed for aniline, a mechanism for electropolymerization was proposed. The immunosensor was assembled by activating the carboxyl groups via an EDC/NHS nucleophilic substitution reaction with the amino groups present in the anti-RSV monoclonal antibody (mAb). The detection was performed using electrochemical impedance spectroscopy, and the data were evaluated using equivalent circuits. The charge transfer resistance values increased as PGE was modified in the following order: PGE < PGE/polymer < PGE/polymer/mAb < PGE/polymer/mAb/virus. 100 ng of mAb was used, and the immobilization times for mAb and blocker were 3 h and 50 min, respectively. The response time for RSV immobilization was 30 min. The limit of detection was 22.54 PFU mL−1, and the limit of quantification was 75.12 PFU mL−1, with a linear range from 50 – 2000 PFU mL−1, demonstrating that the proposed immunosensor is a viable alternative for the detection of RSV.
期刊介绍:
The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry.
The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces.
The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis.
The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.