A Novel DNA biosensor based on a pencil graphite electrode modified with polypyrrole/functionalized multiwalled carbon nanotubes for determination of 6-mercaptopurine anticancer drug

  • Hassan Karimi-Maleh*
  • , Fahimeh Tahernejad-Javazmi
  • , Necip Atar
  • , Mehmet Lütfi Yola
  • , Vinod Kumar Gupta
  • , Ali A. Ensafi
  • *Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

419 Scopus citations

Abstract

A novel and sensitive biosensor employing immobilized DNA on a pencil graphite electrode modified with polypyrrole/functionalized multiwalled carbon nanotubes for the determination of 6-mercaptopurine (6-MP) is presented. In the first step, we modified the pencil graphite surface with polypyrrole and functionalized multiwalled carbon nanotubes (MWCNT/COOH). The developed electrode was characterized by scanning electron microscopy, atomic force microscopy, reflection-absorption infrared spectroscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. In the other step, we used decreases in the oxidation responses of guanine and adenine as a sign of the interaction of 6-MP with salmon sperm double-stranded DNA using differential pulse voltammetry. The signal of guanine oxidation was linear with respect to the 6-MP concentration in the range of 0.2-100 μmol L-1 with a detection limit of 0.08 μmol L-1. The modified electrode was utilized for the determination of 6-MP in real samples.

Original languageEnglish
Pages (from-to)3634-3639
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume54
Issue number14
DOIs
StatePublished - 15 Apr 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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