Sensitive voltammetric determination of testosterone in pharmaceuticals and human urine using a glassy carbon electrode in the presence of cationic surfactant.

Highlights: [•] The first report on the reduction and determination of testosterone by a voltammetric technique in surfactant media. [•] Usefulness of glassy carbon electrode without any modification (except adding cationic surfactant to the solution). [•] More improved sensitivity (detection limit of 1.18nM) over a previously reported voltammetric method. [•] Practical applicability by the direct assays of oil-based pharmaceuticals and urine samples. [ABSTRACT FROM AUTHOR]