Self-directed molecular diagnostics (SdMDx) system for COVID-19 via one-pot processing

Yoon Ok Jang, Nam Hun Kim, Yeonjeong Roh, Bonhan Koo, Hyo Joo Lee, Ji Yeun Kim, Sung Han Kim, Yong Shin

Research output: Contribution to journalArticlepeer-review


Rapid, sensitive, and specific detection of the severe acute respiratory syndrome coronavirus (SARS-CoV)− 2 during early infection is pivotal in controlling the spread and pathological progression of Coronavirus Disease 2019 (COVID-19). Thus, highly accurate, affordable, and scalable point-of-care (POC) diagnostic technologies are necessary. Herein, we developed a rapid and efficient self-directed molecular diagnostic (SdMDx) system for SARS-CoV-2. This system combines the sample preparation step, including virus enrichment and extraction processes, which involve dimethyl suberimidate dihydrochloride and diatomaceous earth functionalized with 3-aminopropyl(diethoxy)methylsilane, and the detection step using loop-mediated isothermal amplification-lateral flow assay (LAMP-LFA). Using the SdMDx system, SARS-CoV-2 could be detected within 47 min by hand without the need for any larger instruments. The SdMDx system enabled detection as low as 0.05 PFU in the culture fluid of SARS-CoV-2-infected VeroE6 cells. We validated the accuracy of the SdMDx system on 38 clinical nasopharyngeal specimens. The clinical utility of the SdMDx system for targeting the S gene of SARS-CoV-2 showed 94.4% sensitivity and 100% specificity. This system is more sensitive than antigen and antibody assays, and it minimizes the use of complicated processes and reduces contamination risks. Accordingly, we demonstrated that the SdMDx system enables a rapid, accurate, simple, efficient, and inexpensive detection of SARS-CoV-2 at home, in emergency facilities, and in low-resource sites as a pre-screening platform and POC testing through self-operation and self-diagnosis.

Original languageEnglish
Article number133193
JournalSensors and Actuators B: Chemical
Publication statusPublished - 2023 Mar 1

Bibliographical note

Funding Information:
This study was supported by the Korea Medical Device Development Fund grant funded by the Korea government (Project Number: HW20C2062 ), and also supported by the Ministry of Science, ICT and Future Planning ( MSIP ) through the National Research Foundation of Korea (NRF) ( 2020R1A2C2007148 ), and also supported by the National Research Council of Science & Technology ( NST ) grant by the Korea government (MSIT) ( CRC-20–02-KIST ).

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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