Original scientific paper

https://doi.org/10.5562/cca2527

A Newly Developed Electrocatalytic Oxidation and Voltammetric Determination of Curcumin at the Surface of PdNp-graphite Electrode by an Aqueous Solution Process with Al3+

Semiha Çakır ; Department of Chemistry, Faculty of Science, Gazi University, 06500 Teknikokullar, Ankara, Turkey
Ender Biçer ; Department of Chemistry, Faculty of Arts and Sciences, Ondokuz Mayıs University, 55139 Atakum, Samsun, Turkey
Emine Yılmaz Arslan ; Ministry of Health of Turkey, Turkey Pharmaceuticals and Medical Devices Agency, 06520 Çankaya-Ankara, Turkey

Abstract

In the first stage, the palladium nanoparticles (PdNps)-coated graphite electrode (PdNp/GE) has been prepared. Scanning electron microscopy (SEM) technique showed that the palladium nanoparticles were uniformly distributed with an average particle diameter of 60–75 nm. And then, a novel-modified electrode has been developed by the physical deposition of Al3+ ions on palladium nanoparticles (PdNps)-coated graphite electrode (Al3+/PdNp/GE). This modified electrode was characterized by square-wave voltammetry (SWV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The sensitivities of PdNp/GE and Al3+/PdNp/GE electrodes were tested with dopamine. Al3+/PdNp/GE exhib¬ited a catalytic activity for curcumin oxidation. The square-wave voltammogram of curcumin in phosphate buffer (pH = 2) gave an anodic peak at 0.56 V. The anodic peak current of curcumin was found to be linearly related to its concentration in the range of 3.0×10-8 M to 6.0×10-7 M with a detection limit of 2.2×10-8 M. It was also found that the novel Al3+/PdNp/GE electrode had the best sensitivity when compared to glassy carbon electrode (GCE), hanging mercury drop electrode (HMDE) and glassy carbon electrode electropolymerized with acid chrome blue K (poly-ACBK/GCE), used for the determination of curcumin. The curcumin was detected in marketed spices sample of turmeric powder. Pure turmeric powder had the highest curcumin concentration, averaging 4.317±0.175 % by weight.

Keywords

modified graphite electrode; Al³⁺ ion; physical deposition; palladium nanoparticles; curcumin

Hrčak ID:

141981

URI

https://hrcak.srce.hr/141981

Publication date:

20.7.2015.

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