Izvorni znanstveni članak

https://doi.org/https://doi.org/10.5599/admet.2577

Gold nanoparticle-modified screen-printed carbon electrodes for label-free detection of SARS-CoV-2 RNA using drop casting and spray coating methods

Salma Nur Zakiyyah ; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung 40173, Indonesia
Nadya Putri Satriana ; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung 40173, Indonesia
Natasha Fransisca ; Universitas Padjadjaran , Department of Chemistry, Faculty of Mathematics and Natural Science, Indonesia
Shabarni Gaffar ; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung 40173, Indonesia
Norman Syakir ; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung 40173, Indonesia
Irkham Irkham ; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung 40173, Indonesia
Yeni Wahyuni Hartati ; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Bandung 40173, Indonesia

Sažetak

Background and purpose: This study aimed to explore the modification of screen-printed carbon electrode (SPCE) to produce an extensive conductive surface with gold nanoparticles (AuNPs) for the detection of Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ribonucleic acid (RNA). Experimental approach: The experiment was carried out using drop casting (DC) and spray coating (SC) methods. Au-S covalent interactions were formed between thiolated single-stranded DNA (ssDNA ) and Au surface, which further hybridized with the target RNA to be detected using differential pulse voltammetry (DPV). Optimization of experimental conditions was performed using Box-Behnken design (BBD) on probe ssDNA concentration, probe ssDNA immobilization time, and target hybridization time. The morphology of the modified electrode was characterized using a scanning electron microscope, while the electrochemical behaviour was determined with DPV and electron impedance spectroscopy. Key results: The results showed that SPCE modification with AuNPs by DC produced a higher peak current height of 12.267 μA with an Rct value of 2.534 kΩ, while SC improved the distribution of AuNPs in the electrode surface. The optimum experimental conditions obtained using BBD were 0.5 µg mL-1 ssDNA-probe concentration, an immobi¬liza¬tion time of 22 minutes, and a hybridization time of 12 minutes. The limit of SARS-CoV-2 RNA detection at a concentration range of 0.5 to 10 μg mL-1 was 0.1664 and 0.694 μg mL-1 for DC and SC, respectively. The T-test results for both methods show that the current response of target RNA with SPCE/AuNP by DC does not show the same result, indicating a significant difference in the current response between those two methods. Conclusion: SPCE/AuNP by DC is better than SPCE/AuNP by SC for immobilizing inosine-substituted ssDNA, which subsequently hybridizes with viral RNA, enabling label-free detection of guanine from SARS-CoV-2 RNA.

Ključne riječi

Electrochemistry; biosensor; drop casting; spray coating; SARS-CoV-2; gold nanoparticles

Hrčak ID:

329609

URI

https://hrcak.srce.hr/329609

Datum izdavanja:

17.2.2025.

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