Microchimica Acta

, 186:485 | Cite as

Two colorimetric ampicillin sensing schemes based on the interaction of aptamers with gold nanoparticles

  • Omid Heydari Shayesteh
  • Raouf GhavamiEmail author
Original Paper


Two kinds of aptasensors for ampicillin (AMP) are described. The assay strategies include the use of gold nanoparticles (AuNPs) that were modified with (a) a thiolated aptamer (T-Apt), and (b) a non-thiolated polyadenine aptamer (polyA Apt). The AuNPs and the aptamers were brought to interaction prior to addition of AMP. T-Apt and polyA Apt are adsorbed on the AuNPs by different mechanisms. The adsorbed aptamer was able to bind the target while preventing non-specific interactions. Remarkably different optical absorbances (measured at 520 and 680 nm) are produced the absence and presence of AMP. The assay can selectively recognize AMP even in the presence of species of similar chemical structure. The T-Apt based assay has a linear response in the 1–600 nM AMP concentration range and a 0.1 nM limit of detection. The respective data for the polyA Apt assay are 1–400 nM and 0.49 nM.

Graphical abstract

Schematic presentation of the colorimetric aptasensor for ampicillin detection using two kinds of anti-ampicillin aptamers and gold nanoparticles. Polydiallyldimethylammonium chloride (PDDA) acts as aggregation agent.


Aptasensor Non-thiolated aptamer Ampicillin PolyA aptamer Gold nanoparticles 


Compliance with ethical standards

The author(s) declare that they have no competing interests. The authors alone are responsible for the content and writing of the paper.

Supplementary material

604_2019_3524_MOESM1_ESM.doc (487 kb)
ESM 1 (DOC 487 kb)


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of ScienceUniversity of KurdistanSanandajIran

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