Özok, H.İ.Yardım, Y.2025-05-102025-05-1020230925-963510.1016/j.diamond.2023.1100582-s2.0-85161302663https://doi.org/10.1016/j.diamond.2023.110058https://hdl.handle.net/20.500.14720/3122This work demonstrates an electroanalytical evaluation for voltammetric sensing of the anti-cancer drug imiquimod (IMQ) at the boron-doped diamond electrode. By using cyclic voltammetric technique, IMQ demonstrated a well-defined, adsorption-controlled, irreversible anodic peak at approximately +1.56 V (vs Ag/AgCl) in 0.1 M H2SO4 solution. A possible mechanism for the electro-oxidation of IMQ was proposed based on the pH investigation data. The voltammetric signals of IMQ were improved by adding sodium dodecyl sulfate (SDS), an anionic surfactant, to the selected supporting electrolyte. By utilizing the square wave-adsorptive stripping voltammetric technique, acceptable linearity was obtained in 0.1 M H2SO4 solution with SDS at about +1.49 V (vs Ag/AgCl). The presented approach was linear in the concentration range of 0.005 and 1.0 μg mL−1 (2.1 × 10−8-4.2 × 10−6 M), with a lower limit of detection of 0.0015 μg mL−1 (6.2 × 10−9 M). Eventually, the proposed approach's applicability was investigated by sensing IMQ in pharmaceutical formulations and urine samples. © 2023 Elsevier B.V.eninfo:eu-repo/semantics/closedAccessAnionic SurfactantBoron-Doped Diamond ElectrodeImiquimodPharmaceutical FormulationSensingUrine SamplesArticle136Q2Q2