Sensitive and selective voltammetric method for determination of quinoline alkaloid, quinine in soft drinks and urine by applying a boron-doped diamond electrode

In this paper, for the first time, the method of determination of the alkaloid of quinoline derivation, quinine (QN), was developed. A miniatured planar electrochemical cell with a working electrode, a boron-doped diamond electrode (BDDE), was used. QN is easily oxidized in a strongly acidic environment – 2 M HClO4 at a potential of Epa = +1.42 V, and in an alkaline environment.