Abstract
Vaccinia is caused by the vaccinia virus and affects thousands of people, particularly in underprivileged communities, in over 100 countries worldwide. In Brazil, more than 10,000 cases are registered between January and June 2023, with some resulting in fatalities. This study investigates the use of pencil graphite electrodes (PGEs) modified with polymeric films from 2-hydroxybenzamide (2HB) and 4-hydroxybenzamide (4HB) to develop a biosensor to diagnose vaccinia virus (VACV) infection. Polymeric films were produced by electropolymerization of the respective monomers using cyclic voltammetry. The modified electrodes showed a reduced response to the potassium ferro/ferricyanide solution and increased charge transfer resistance (Rct). Two recognition strategies have been proposed: immobilizing VACV for detecting anti-VACV antibodies and immobilizing anti-VACV for virus detection. In the detection of anti-VACV, Rct increased by approximately 162% for PGE/poly(2HB) and 55% for PGE/poly(4HB), with no significant changes observed for non-specific antibodies. For VACV detection, the Rct response increased by 30 and 190% in the presence of the viral particles for PGE/poly(2HB) and PGE/poly(4HB), respectively. The biosensors displayed a significant increase in Rct response in the presence of viral particles, demonstrating their potential for detecting viral antigens or antibodies. PGE/poly(2HB) and PGE/poly(4HB) were found to be suitable for detecting anti-VACV and the vaccinia virus itself, respectively, using the applied method. These findings highlight the versatility of the biosensor for a wide range of applications, including diagnostic tests and vaccine quality control, and emphasize its potential for VACV diagnosis. A biosensor that detects both vaccinia antigens and viruses can aid in monitoring immune responses, diagnosing infections, ensuring vaccine safety, and tracking outbreaks.
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Acknowledgements
The authors gratefully acknowledge financial support from Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brasil (CAPES), Finance Code 001.
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RMC performed conceptualization, methodology, investigation, writing—original draft. KLS analyzed resources, methodology, investigation, writing—original draft. AOA and PIS conducted investigation. DBO provided resources, conceptualization, writing—review, review & editing. ACP and DLF drafted writing—review & editing. LFF approved conceptualization, supervision, project administration, funding acquisition, writing—review & editing.
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Coelho, R.M., de Oliveira Almeida, A., Soares, P.I. et al. A low-cost electrochemical biosensor for vaccinia virus using pencil graphite electrodes modified with poly(hydroxybenzamide). Chem. Pap. 77, 7563–7575 (2023). https://doi.org/10.1007/s11696-023-03073-y
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DOI: https://doi.org/10.1007/s11696-023-03073-y