The planar carbon working microelectrodes modified with MWCNTs/DMF to promote the
electrochemical oxidation of insulin were fabricated. Our experiments using cyclic voltammetry
confirmed the possibility of electrochemical insulin detection on our working electrode. We were able to
determine insulin from the concentration of 250 nmol.L-1. We obtained linear calibration curve in the
range of insulin concentration from 250 nmol.L-1 to 1.6 Pmol.L-1. Considering these first results could be
concluded that there is high possibility to fabricate special three-electrode sensor for fast insulin
detection.