A Rapid Label-Free Disposable Electrochemical Salivary Point-of-Care Sensor for SARS-CoV-2 Detection and Quantification.

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  • Additional Information
    • Source:
      Publisher: MDPI Country of Publication: Switzerland NLM ID: 101204366 Publication Model: Electronic Cited Medium: Internet ISSN: 1424-8220 (Electronic) Linking ISSN: 14248220 NLM ISO Abbreviation: Sensors (Basel) Subsets: MEDLINE
    • Publication Information:
      Original Publication: Basel, Switzerland : MDPI, c2000-
    • Subject Terms:
      COVID-19*/diagnosis ; Metal Nanoparticles* ; Nanotubes, Carbon* ; Biosensing Techniques*; Humans ; SARS-CoV-2 ; Gold ; Point-of-Care Systems
    • Abstract:
      The coronavirus disease 2019 (COVID-19) pandemic has created an urgent need for accurate early diagnosis and monitoring. A label-free rapid electrochemical point-of-care (POC) biosensor for SARS-CoV-2 detection in human saliva is reported here to help address the shortcomings of traditional nucleic acid amplification methods and give a quantitative assessment of the viral load to track infection status anywhere, using disposable electrochemical sensor chips. A new chemical construct of gold nanoparticles (GNp) and thionine (Th) are immobilized on carboxylic acid functionalized carbon nanotubes (SWCNT-COOH) for high-performance biosensing. The sensor uses saliva with a one-step pretreatment and simple testing procedure as an analytical medium due to the user-friendly and non-invasive nature of its procurement from patients. The sensor has a response time of 5 min with a limit of detection (LOD) reaching 200 and 500 pM for the freely suspended spike (S) protein in phosphate buffer saline (PBS) and human saliva, respectively. The sensor's performance was also proven for detecting a COVID-19 pseudovirus in an electrolyte solution with a LOD of 10 6 copies/mL. The results demonstrate that the optimized POC sensor developed in this work is a promising device for the label-free electrochemical biosensing detection of SARS-CoV-2 and different species of viruses.
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    • Contributed Indexing:
      Keywords: COVID-19; SARS-CoV-2 detection; biosensor; electrochemistry; point-of-care; saliva; spike protein
    • Accession Number:
      7440-57-5 (Gold)
      0 (Nanotubes, Carbon)
    • Publication Date:
      Date Created: 20230108 Date Completed: 20230110 Latest Revision: 20230111
    • Publication Date:
      20231215
    • Accession Number:
      PMC9823438
    • Accession Number:
      10.3390/s23010433
    • Accession Number:
      36617031