Microchimica Acta

, 185:21 | Cite as

Selection of DNA aptamers against Mycobacterium tuberculosis Ag85A, and its application in a graphene oxide-based fluorometric assay

  • Najmeh Ansari
  • Kiarash Ghazvini
  • Mohammad Ramezani
  • Mahin Shahdordizadeh
  • Rezvan Yazdian-Robati
  • Khalil AbnousEmail author
  • Seyed Mohammad TaghdisiEmail author
Original Paper


The Mycobacterium Ag85 complex is the major secretory protein of M. tuberculosis. It is a potential marker for early diagnosis of tuberculosis (TB). The authors have identified specific aptamers for Ag85A (FbpA) via protein SELEX using magnetic beads. After twelve rounds of selection, two aptamers (Apt8 and Apt22) were chosen from different groups, and their binding constants were determined by flow cytometry. Apt22 (labeled with Atto 647N) binds to FbpA with high affinity (Kd = 63 nM) and specificity. A rapid, sensitive, and low-cost fluorescent assay was designed based on the use of Apt22 and graphene oxide, with a limit of detection of 1.5 nM and an analytical range from 5 to 200 nM of FbpA.
Graphical abstract

Schematic illustration of graphene oxide-based aptasensor for fluorometric determination of FbpA.


SELEX Serum Fluorescent assay Limit of detection Secretory protein Quenching 



Financial support of this study was provided by Mashhad University of Medical Sciences. This report has been extracted from the Ph.D. thesis of Najmeh Ansari.

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2017_2550_MOESM1_ESM.doc (302 kb)
ESM 1 (DOC 302 kb)


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of Microbiology and Virology, Faculty of MedicineMashhad University of Medical SciencesMashhadIran
  2. 2.Antimicrobial Resistance Research Center, Buali Research Institute, Department of Microbiology and Virology, Faculty of MedicineMashhad University of Medical SciencesMashhadIran
  3. 3.Nanotechnology Research CenterMashhad University of Medical SciencesMashhadIran
  4. 4.Department of Pharmaceutical Biotechnology, School of PharmacyMashhad University of Medical SciencesMashhadIran
  5. 5.Pharmaceutical Research CenterMashhad University of Medical SciencesMashhadIran
  6. 6.Targeted Drug Delivery Research CenterMashhad University of Medical SciencesMashhadIran

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