Bio-inspired recognition of dopamine versus ascorbic acid

Selective NO reduction using blue ferrocenyl cation

“…The gold electrode was cleaned and standardized as described earlier [10]. The surface of gold electrodes needs proper pretreatment to get a smooth and reproducible surface.…”

Selective determination of dopamine in the presence of ascorbic acid at the carbon atom wire modified electrode

“…It has been recognized that (1) at pH 6.0, AA (pK a = 4.10) and DA (pK a = 8.87) exist in the anionic and cationic forms, respectively [7,15,17]; (2) oxidized DA can be chemically reduced by AA [5,15]; (3) an oxidized acid can introduce carboxyl and hydroxyl groups on carbon nanotubes, and, these groups, in turn, increase the negativity of the carbon nanotubes [9,11]. From the point of view of electrostatic interaction, the negatively charged surface of CAW, especially the HNO 3 treated CAW modified electrode, due to the existence of a number of hydroxyl and carboxyl groups [6], would tend to adsorb the positively charged DA and retard the oxidation of AA negatively charged, resulting in the positive shift of E pa and the decrease of i pa of AA in the presence of DA, compared to the case without the presence of DA, as shown in Table 1.…”

“…However, in real biological matrixes, dopamine coexists with some other compounds, such as ascorbic acid (AA) which has voltammetric responses overlapped with those of DA at usual electrodes. Many researchers have made their efforts to tackle the problem by use of various modified electrodes [7][8][9][10][11][12][13][14][15][16][17].…”

Tailoring self-assembled monolayers at the electrochemical interface

“…30,40 On a cleaned Au surface, cysteamine monolayer was formed and the terminal amino groups were exploited for crosslinking reactions using glutaraldehyde. 1,4-Diamino anthraquinone was used as mediator to which the enzyme glucose oxidase was immobilized.…”