Dopamine Sensitive ELISA Assay Utilized in Recent Publication

The Eagle Bioscience’s Polystreptavidin R Extraordinary High Biotin Binding Capacity was utilized in a recent publication. The researchers of this study were focusing on the use of an aptamer sandwich lateral flow assay (AptaFlow) for antibody-free SARS-CoV-2 detection. Check out the full text and abstract below.


The COVID-19 pandemic is among the greatest health and socioeconomic crises in recent history. Although COVID-19 vaccines are being distributed, there remains a need for rapid testing to limit viral spread from infected individuals. We previously identified the SARS-CoV-2 spike protein N-terminal domain (NTD) binding DNA aptamer 1 (SNAP1) for detection of SARS-CoV-2 virus by aptamer–antibody sandwich enzyme-linked immunoassay (ELISA) and lateral flow assay (LFA). In this work, we identify a new aptamer that also binds at the NTD, named SARS-CoV-2 spike protein NTD-binding DNA aptamer 4 (SNAP4). SNAP4 binds with high affinity (<30 nM) for the SARS-CoV-2 spike protein, a 2-fold improvement over SNAP1. Furthermore, we utilized both SNAP1 and SNAP4 in an aptamer sandwich LFA (AptaFlow), which detected SARS-CoV-2 UV-inactivated virus at concentrations as low as 106 copies/mL. AptaFlow costs <$1 per test to produce, provides results in <1 h, and detects SARS-CoV-2 at concentrations that indicate higher viral loads and a high probability of contagious transmission. AptaFlow is a potential approach for a low-cost, convenient antigen test to aid the control of the COVID-19 pandemic.

Yang L.F., Kacherovsky N., Panpradist N., et al. Aptamer Sandwhich Lateral Flow Assay (AptaFlow) for Antibody-Free SARS-CoV-2 Detection. Anal. Chem. 2022: 94:20, 7278–7285.

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