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MALDI-TOF Mass Spectrometry01:19

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Specific and Rapid SARS-CoV-2 Identification Based on LC-MS/MS Analysis.

Ofir Schuster1, Anat Zvi2, Osnat Rosen3

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ACS Omega
|February 15, 2021
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Summary

A new mass spectrometry (MS) assay offers rapid and specific identification of SARS-CoV-2. This method complements real-time quantitative polymerase chain reaction (RT-qPCR) testing for COVID-19 diagnosis.

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Area of Science:

  • Virology
  • Analytical Chemistry
  • Biochemistry

Background:

  • The COVID-19 pandemic, caused by SARS-CoV-2, necessitates accurate diagnostic tools.
  • Real-time quantitative polymerase chain reaction (RT-qPCR) is the gold standard but has limitations.
  • Alternative diagnostic methods are needed to complement existing assays.

Purpose of the Study:

  • To develop and validate a novel mass spectrometry (MS)-based assay for SARS-CoV-2 identification.
  • To establish a rapid, specific, and reliable diagnostic method for COVID-19.
  • To assess the concordance of the MS assay with RT-qPCR in clinical samples.

Main Methods:

  • Development of a multistep procedure for selecting specific SARS-CoV-2 peptide markers.
  • Utilizing liquid chromatography coupled to high-resolution mass spectrometry (LC-MS/MS) for peptide identification.
  • Validation using purified proteins, cell-cultured virus, spiked matrices, and clinical nasopharyngeal samples.

Main Results:

  • Identification of six unique and specific peptide markers for SARS-CoV-2.
  • The assay demonstrated a limit of detection of 10^4 PFU/mL.
  • Achieved 94% concordance with RT-qPCR in 16 clinical samples.

Conclusions:

  • A novel, rapid (2.5-hour) MS-based assay for SARS-CoV-2 detection has been developed.
  • The assay is specific, sensitive, and reproducible, offering a complementary diagnostic approach.
  • This method provides a valuable alternative or adjunct to RT-qPCR for COVID-19 diagnosis.