engleski

Caffeine – electrochemical behaviour on the surface of swnt electrode

Caffeine is a white crystalline powder, bitter in taste and odourless. It is an alkaloid from the xanthine group. The main sources of caffeine are coffee, energy drinks, dietary supplements. Caffeine is electroactive species and therefore, the aim of this work was to investigate the electrochemical behaviour of caffeine on the surface of single-walled carbon nanotubes (SWCNT) electrode as a working electrode. The investigated cyclic voltammetry conditions were as follow the effect of pH values of inert buffer, the concentration of caffeine, polarization rate, and multiple consecutive polarization. The electrochemical behaviour of caffeine on the surface of the SWCNT electrode had shown irreversible electrode reaction and diffusion- controlled process. The effect of concentration had shown linear increase in anode current response with increasing analyte concentration (R2 = 0.9999 ; LOD = 4.4 mg L-1 ; LOQ = 14.8 mg L-1). The cyclic voltammetry had shown as an applicable method to the characterization of caffeine.

caffeine ; SWNT electrode ; cyclic voltammetry

nije evidentirano