Aptamer-aptamer linkage based aptasensor for highly enhanced detection of small molecules

Van Thuan Nguyen, Bang Hyun Lee, Sang Hoon Kim, Man Bock Gu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The multi-target colorimetric aptasensors can be easily fabricated by using two different aptamer sequences. However, there have been no research reports about improvement or enhancing of colorimetric signals based on the aggregation properties of AuNPs. Herein, we report a simple and efficient method to control and enhance the function of the multi-target aptasensor using an aptamer-aptamer linkage method. The aptasensor was developed for highly sensitive multiple-target detection of small molecules. The extension of aptamer DNA sequences using this method resulted in the enhanced analytical sensitivity of this aptasensor in sensing applications for two small molecule targets. Furthermore, the mechanism of the interaction between DNA aptamer and AuNPs was studied by measuring the zeta potential to explain the enhancement of the sensitivity of this multi-target aptasensor. The limit of detection of this multi-target aptasensor was found to be 1 nM and 37 nM for kanamycin (KAN) and chlortetracycline (CHLOR), respectively. It is 25-fold lower than in the previous report using an AuNP-based sensor for defining the limit of detection (LOD) of KAN and five times lower than the LOD for CHLOR. This aptasensor has great potential in the simultaneous detection of a wide range of KAN and CHLOR concentrations.

Original languageEnglish
Pages (from-to)843-849
Number of pages7
JournalBiotechnology Journal
Issue number6
Publication statusPublished - 2016 Jun 1


  • Aptasensor
  • AuNPs
  • Multi-target
  • Small molecules
  • Zeta potential

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Molecular Medicine


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