Determination of epinephrine at different types of carbon paste electrodes

Zuzana Jemelkova, Jiri Barek, Jiri Zima

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The voltammetric behavior of epinephrine was investigated by differential pulse voltammetry (DPV) at a carbon paste electrodes (CPE) made of different carbon powders - CR-2, glassy carbon (GC) microparticles, and single-wall carbon nanotubes (SWNT). In Briton-Robinson (BR) buffer solution pH 6, the linear dependence was found for the determination of epinephrine by the given method in the concentration ranges of 1 · 10-6-1 · 10-4 (CR-2), 1 · 10-6-1 · 10-4 (GC microparticles) and 4 · 10-6-1 · 10-4 (SWNT) mol · dm-3. Limits of detection were 8 · 10-7, 8 · 10-7, and 2 · 10-6mol · dm-3, respectively. The best results were obtained employing CPE containing carbon paste with 50% (m/m) of SWNT, a linear dynamic range being 4 · 10-7-1 · 10-4 mol · dm-3 and a limit of detection 2 · 10-7 mol · dm-4. The attempt to increase the sensitivity by adsorptive accumulation of epinephrine was not successful.

Original languageEnglish
Pages (from-to)1367-1376
Number of pages10
JournalAnalytical Letters
Volume43
Issue number7
DOIs
Publication statusPublished - 1 May 2010
Externally publishedYes

Keywords

  • Carbon nanotubes
  • Carbon paste electrode
  • Crystal graphite
  • Differential pulse voltammetry
  • Epinephrine
  • Glassy carbon microparticles

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Analytical Chemistry
  • Electrochemistry
  • Spectroscopy
  • Biochemistry, medical

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