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 language | English |
|---|---|
| Pages (from-to) | 3634-3639 |
| Number of pages | 6 |
| Journal | Industrial and Engineering Chemistry Research |
| Volume | 54 |
| Issue number | 14 |
| DOIs | |
| State | Published - 15 Apr 2015 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2015 American Chemical Society.
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering