Temperature-Responsive Liposome-Linked Immunosorbent Assay for the Rapid Detection of SARS-CoV-2 Using Immunoliposomes

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is the etiological agent of coronavirus disease 2019 (COVID-19), has infected more than 340 million people since the outbreak of the pandemic in 2019, resulting in approximately 55 million deaths. The rapid and effective diagnosis of COVID-19 patients is vital to prevent the spread of the disease. In a previous study, we reported a novel temperature-responsive liposome-linked immunosorbent assay (TLip-LISA) using biotinylated-TLip that exhibited high detection sensitivity for the prostate-specific antigen. Herein, we used immunoglobulin-TLip (IgG-TLip), in which the antibodies were directly conjugated to the liposomal surface to simplify pretreatment procedures and reduce the detection time for SARS-CoV-2. The results indicated that TLip-LISA could detect the recombinant nucleocapsid protein and the nucleocapsid protein in inactivated virus with 20 min incubation time in total, and the limit of detection was calculated to be 2.2 and 1.0 pg/mL, respectively. Therefore, TLip-LISA has high potential to be used in clinic for rapid diagnosis and disease control.

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