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Gold electrodes modified with gold nanoparticles and thio compounds for electrochemical sensing of dopamine alone and in presence of potential interferents. A comparative study |
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| Authors: | Teresa ?uczak Maria Be?towska-Brzezinska |
| Institution: | 1. Department of Physical Chemistry, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, PL-60-780, Pozna??, Poland |
| Abstract: | Gold electrodes were modified with self assembled layers (SAMs) composed of mercaptopropionic acid, thiodipropionic acid, dithiodipropionic acid, cysteamine and gold nanoparticles and used to study the electrooxidation of dopamine (DA) in solution at pH 7. SAMs endowed with gold nanoparticles gave the highest catalytic effect. The results showed that such electrodes are capable of resolving the oxidation peaks of DA, ascorbic acid, and uric acid which is most favourable with respect to the detection of DA in physiological matrices. Gold electrodes modified with S-containing compound and gold nanoparticles were used for determination of dopamine in aqueous solution. The modified electrodes could clearly resolve the oxidation peaks of dopamine, ascorbic acid and uric acid with peak-to-peak separation enabling determination of these compounds in the presence of each other. |
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