The influence of addition of dsDNA on the electrocatalytic effect of carbon matrices, e.g. synthetic monocrystalline
diamond, fullerenes C60 and multi-walled carbon nanotubes was studied. Three neurotransmitters: dopamine, epinephrine
and norepinephrine, which are known as biomarkers that play an important role in transporting and modulating
nervous impulses in the synapse were chosen as model analytes. Cyclic voltammetry was used to determine the optimum
working conditions with a phosphate buffer solution at a pH=4 with KNO3 as support electrolyte. Differential pulse voltammograms
(DPVs) were employed to assess the electrolytic effect of dsDNA on carbon matrices under the optimized
conditions, and the potential applications of the biosensors for pharmaceutical and biomedical analysis.