Chemically modified pencil electrodes for application in reagentless chronopotentiometric antioxidant activity measurement

Recently a novel chronopotentiometric method has been introduced that was found useful for assessing antioxidant activity. In our experiments, the performance of chemically modified working electrodes made of different pencil materials were tested in the novel method. Redox mediator film of Meldola Blue was formed on electrode surfaces. The stability of the film, the number of molecules structuring it has been studied. In antioxidant measurements, controlled potential oxidation of the mediator was made followed by recording the open cell potential in time. The initial slope of this was used as analytical signal. Results proved applicability of the pencil probes.

Automated summary

Recently, a novel chronopotentiometric method has been introduced for assessing antioxidant activity. The performance of chemically modified working electrodes made of different pencil materials were tested in this method. The stability and structure of the formed Meldola Blue film on the electrode surfaces were studied. Antioxidant measurements were conducted by controlled potential oxidation of the mediator and recording the open cell potential over time. The initial slope of the recorded potential was used as the analytical signal, showing the applicability of the pencil probes.