Specific detection of avian influenza H5N2 whole virus particles on lateral flow strips using a pair of sandwich-type aptamers

Sang Hoon Kim, Junho Lee, Bang Hyun Lee, Chang Seon Song, Man Bock Gu

Research output: Contribution to journalArticle

4 Citations (Scopus)


We report a selection of a cognate pair of aptamers for whole avian influenza virus particles of H5N2 by using graphene-oxide based systemic evolution of ligands by exponential enrichment (GO-SELEX), and the application of a pair of sandwich-type binding aptamers on the lateral flow strips. The aptamers were characterized by GO-FRET assay, and Kd values of the selected aptamers were estimated to be from 6.913 × 10 5 to 1.27 × 10 6 EID 50 /ml (EID 50 /ml: 50% egg infective dose). Based on the evidence from confocal laser scanning microscope (CLSM), surface plasmon resonance (SPR), and circular dichroism (CD) spectrum analysis, the aptamers, J 3 APT and JH 4 APT, were found to be working as a cognate pair that binds to the target virus at the different sites simultaneously. This cognate pair of aptamers then was successfully applied on the lateral flow strips, clearly showing sandwich-type binding images with the presence of the certain numbers of H5N2 virus particles. On the newly developed lateral flow strips, the target virus was detectable down to 6 × 10 5 EID 50 /ml in the buffer and 1.2 × 10 6 EID 50 /ml in the duck's feces, respectively, by the naked eye. By using the ImageJ software, the LOD was found to be 1.27 × 10 5 EID 50 /ml in the buffer and 2.09 × 10 5 EID 50 /ml in the duck's feces, respectively. Interestingly, on the lateral flow strips, enhanced specificity towards the target virus (H5N2) appeared over other subtypes of H5Nx. To the best of our knowledge, this is the first report about the application of the cognate pair of aptamers for the detection of influenza virus on the lateral flow strips. This study shows the promising perspective of a cognate pair of aptamers for the on-site detection system which could be useful for rapid detection of avian influenza viruses for preventing the pandemic influenza viruses from spreading.

Original languageEnglish
Pages (from-to)123-129
Number of pages7
JournalBiosensors and Bioelectronics
Publication statusPublished - 2019 Jun 1



  • A cognate pair of aptamers
  • Lateral flow strip
  • Sandwich-type binding
  • Whole influenza virus particle

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry

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