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Silica-coated magnetic particles for efficient RNA extraction for SARS-CoV-2 detection
Natalia Capriotti1, Leslie C Amorós Morales2, Elisa de Sousa3
1Laboratorio de Neurobiología de Insectos (LNI), Centro Regional de Estudios Genómicos, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CENEXA, CONICET, La Plata, Buenos Aires, Argentina.
Heliyon
|February 7, 2024
Summary
This study developed an efficient, locally sourced magnetic nanoparticle method for purifying viral RNA from COVID-19 patient swabs. The method is comparable to existing techniques, aiding high-throughput molecular diagnostics.
Area of Science:
- Molecular Diagnostics
- Nanotechnology
- Virology
Background:
- Molecular diagnostic methods for viral RNA detection, such as quantitative reverse transcription polymerase chain reaction (qRT-PCR), require efficient nucleic acid purification.
- Automation is crucial for high-throughput clinical laboratories to process large sample volumes efficiently.
- Magnetic solid-phase separation (MSPS) using magnetic microparticles offers an automatable approach for RNA isolation.
Purpose of the Study:
- To develop and evaluate a novel, cost-effective MSPS method for purifying viral RNA from nasopharyngeal and oropharyngeal swabs.
- To assess the efficiency and comparability of the developed method for high-throughput severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) diagnosis.
- To address the shortage of imported diagnostic supplies by creating a locally synthesized RNA extraction procedure.
Main Methods:
- Synthesized silica-coated magnetite nanoparticles (Fe3O4@SiO2) via coprecipitation and hydrolysis of tetraethyl orthosilicate (TEOS).
- Developed an RNA extraction protocol using these magnetic nanoparticles (MNPs) for oro- and nasopharyngeal swab samples.
- Evaluated RNA quantity and purity using gel electrophoresis, spectrophotometry, and qRT-PCR; compared performance against spin column and commercial automated MSPS methods.
Main Results:
- The developed MSPS method efficiently purified RNA from nasopharyngeal and oropharyngeal swabs.
- RNA extraction efficiency was comparable to established spin column and commercial automated magnetic particle methods.
- The method demonstrated comparable sensitivity for SARS-CoV-2 detection via qRT-PCR.
Conclusions:
- The locally synthesized magnetic nanoparticle-based MSPS method is an effective and sensitive tool for viral RNA purification in high-throughput SARS-CoV-2 diagnostics.
- This approach provides a viable alternative to imported kits, particularly crucial during global health crises.
- The study successfully validated a low-cost, automatable RNA extraction technique for clinical molecular diagnostics.
