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Rodríguez‐Penedo, Alejandro; Rioboó‐Legaspi, Pablo; González‐López, Andrea; Lores‐Padín, Ana; Pereiro, Rosario; García‐Suárez, María del Mar; Cima‐Cabal, María Dolores; Costa‐Rama, Estefanía; Fernández, Beatriz; Fernández‐Abedul, M. Teresa
Advanced healthcare materials, 05/2023, Letnik: 12, Številka: 12Journal Article
Quantitative polymerase chain reaction (qPCR) is considered the gold standard for pathogen detection. However, improvement is still required, especially regarding the possibilities of decentralization. Apart from other reasons, infectious diseases demand on‐site analysis to avoid pathogen spreading and increase treatment efficacy. In this paper, the detection of SARS‐CoV‐2 is carried out by reverse transcription loop‐mediated isothermal amplification, which has the advantage of requiring simple equipment, easily adaptable to decentralized analysis. It is proposed, for the first time, the use of palladium nanoclusters (PdNCs) as indicators of the amplification reaction at end point. The pH of the medium decreases during the reaction and, in turn, a variation in the catalytic activity of PdNCs on the oxygen reduction reaction (ORR) can be electrochemically observed. For the detection, flexible and small‐size screen‐printed electrodes can be premodified with PdNCs, which together with the use of a simple and small electrochemical equipment would greatly facilitates their integration in field‐deployable devices. This would allow a faster detection of SARS‐CoV‐2 as well as of other future microbial threats after an easy adaptation. In this article, authors propose an innovative methodology for electrochemical COVID‐19 diagnosis using palladium nanoclusters (PdNCs)‐based voltammetry. The product of the isothermal loop‐mediated amplification (LAMP) is transferred to a card with screen‐printed electrodes, previously modified with PdNCs. The change in the pH that occurs during a LAMP reaction produces a variation in the catalytic activity of PdNCs.
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