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Palladium nanoparticles and nanowires deposited electrochemically: AFM and elec...
Diculescu, Victor; Chiorcea-Paquim, Ana-Maria; Corduneanu, Oana; Oliveira-Brett, AnaAbstract Palladium nanoparticles and nanowires electrochemically deposited onto a carbon surface were studied using cyclic voltammetry, impedance spectroscopy and atomic force microscopy. The ex situ and in situ atomic force microscopy (AFM) topographic images showed that nanoparticles and nanowires of palladium were preferentially electrodeposited to surface defects on the highly oriented pyrolytic graphite s...
On the Electrochemical Oxidation of Resveratrol
Corduneanu, Oana; Janeiro, Patricia; Brett, Ana Maria OliveiraResveratrol (3,5,4prime-trihydroxystilbene) is an organic metabolite produced by plants in response to fungal infection. It is found in various plant fruits and is abundant in the skins of unripe grapes and related products. This photosensitive molecule exists in two isomeric forms, trans and cis-resveratrol. The antioxidant activity of resveratrol, both trans and cis forms, was evaluated by means of cyclic, di...
Chrysin and (±)-Taxifolin Electrochemical Oxidation Mechanisms
Janeiro, Patricia; Corduneanu, Oana; Brett, Ana Maria OliveiraThe electrochemical behaviour of the flavone chrysin and the dihydroflavonol (±)-taxifolin was investigated by different electrochemical techniques at different pH values. Dihydroflavonol (±)-taxifolin presented two oxidation peaks. The first electrooxidation reaction of (±)-taxifolin is reversible over the whole pH range. The dependence of peak current on pH showed a maximum around neutral pH values with a dec...
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