Electrochemical Determination of Tyramine Using a Carbon Ionic Liquid Paste Electrode Modified with f-MWCNTs/Graphene Nanocomposite Film

This paper describes the development of a carbon paste electrode based on the butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([bmim] NTF2) ionic liquid and its modification with functionalized multiwalled carbon nanotubes (f-MWCNTs) /graphene (GR) nanocomposite film. The f-MWCNTs-GR modified carbon ionic liquid paste electrode (CILPE) was utilized for electrochemical determination of tyramine using the square wave voltammetry technique. The prepared electrochemical sensor exhibited an excellent electrocatalytic behavior for oxidation of tyramine molecules in solutions compared to the carbon paste electrode. This behavior can be assigned to the synergistic effect of carbon nanotubes, graphen and ionic liquid. The oxidation peak currents of tyramine were linear in the concentration range of 1-1000 mu M with a detection limit of 0.5 mu M. The obtained experimental results showed that the f-MWCNTs-GR/CILPE has a good selectivity toward tyramine molecules in the presence of interfering specious and it can be used confidently for measurement the concentration of tyramine in food and biological samples.

Automated summary

This paper presents the development of a carbon paste electrode modified with f-MWCNTs/GR nanocomposite film and the butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([bmim] NTF2) ionic liquid. The modified electrode showed excellent electrocatalytic behavior for the oxidation of tyramine, attributed to the synergistic effect of carbon nanotubes, graphene, and ionic liquid. The sensor exhibited linear oxidation peak currents for tyramine in the concentration range of 1-1000 μM and a detection limit of 0.5 μM. The f-MWCNTs-GR/CILPE demonstrated good selectivity for tyramine molecules in the presence of interfering specious, making it suitable for determining tyramine concentrations in food and biological samples.