caa a22 4500 445881216 CHVBK 20180317145544.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00604-011-0632-1 doi (NATIONALLICENCE)springer-10.1007/s00604-011-0632-1 Determination of dopamine with improved sensitivity by exploiting an accumulation effect at a nano-gold electrode modified with poly(sulfosalicylic acid) [Elektronische Daten] [Juan Li, Jia Chen, Xiaoli Zhang] We describe a glassy carbon electrode modified with nano-gold and a film of poly(sulfosalicylic acid) that was obtained by electropolymerization of sulfosalicylic acid. The electrochemical characteristics of the electrode were investigated by using (a) the anionic hexacyanoferrate, and (b) the cationic ruthenium-trisbipyridyl systems as redox probes. The electrode displayed selective and enhanced electroanalytical response towards dopamine (DA), obviously because DA (which is cationic) is accumulated at the electrode, while anions such as ascorbic acid (AA) do not and in fact are being repelled. A 2000-fold molar excess of AA is tolerated after a 120-s accumulation time followed by stripping detection at pH6.5. Response is linear with the concentration of DA in the range from 0.05 to 5μM, and the detection limit is 7 nM (at an S/N of 3) even in the presence of 100 μM concentrations of AA. Figure The poly (sulfosalicylic acid) film incorporated nano-gold modified electrode was fabricated and used for the selective detection of dopamine. A 2000-fold molar excess of ascorbic acid is tolerated by exploiting an accumulation effect. This work shows high specificity, sensitivity and wide linear range. Springer-Verlag, 2011 Polymer film incorporated nano-gold modified electrode nationallicence Electropolymerization nationallicence Electrodeposition nationallicence Voltammetry nationallicence Dopamine nationallicence Preconcentration nationallicence Li Juan School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, China aut Chen Jia School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, China aut Zhang Xiaoli School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, China aut Microchimica Acta Springer Vienna 174/3-4(2011-09-01), 345-352 0026-3672 174:3-4<345 2011 174 604 https://doi.org/10.1007/s00604-011-0632-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00604-011-0632-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Juan School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, China aut NATIONALLICENCE 700 1- Chen Jia School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, China aut NATIONALLICENCE 700 1- Zhang Xiaoli School of Chemistry and Chemical Engineering, Shandong University, 250100, Jinan, China aut NATIONALLICENCE 773 0- Microchimica Acta Springer Vienna 174/3-4(2011-09-01), 345-352 0026-3672 174:3-4<345 2011 174 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer