Detection of dopamine on a mercapto-terminated hexanuclear Fe(III) cluster modified gold electrode

A label-free aptasensor based on polyethyleneimine wrapped carbon nanotubes in situ formed gold nanoparticles as signal probe for highly sensitive detection of dopamine

“…Detection limit and linear calibration range of the proposed modified electrode were compared with those previously reported and the results are summarized in Table 1. As can be seen, the analytical parameters are comparable or better than the results reported for DA determination at the surface of other modified electrodes [33][34][35][36][37][38][39][40][41][42][43].…”

Gold Electrodes Modified with Calix[4]arene for Electrochemical Determination of Dopamine in the Presence of Selected Neurotransmitters

“…The first well-defined couple (peak 1) is located in the range of potential from −100 to +600 mV. According to the literature, these redox peaks correlate with an oxidation/reduction of the catechol group of DA/DAQ (reaction 1, Scheme 1) [15,34,35,36,37]. For these two peaks, the relations of cathodic as well as anodic peak current versus the scan rate, are linear (Figure 2B).…”

“…The difference between the position of anodic and cathodic peaks current indicates, that the redox reactions in the tested potential range are quasi reversible. The second couple of peaks (peak 2) observed at the potential range from −600 to −250 mV are attributed to the redox reaction of the DA cyclized products (LDAC → DAC) (reaction 3, Scheme 1) [34,36,37,38]. Peak 2 is observed because the reaction 2 rate was fast enough and a sufficient amount of LDAC was generated for the subsequent reaction 3.…”

Graphene Oxide Modified Electrodes for Dopamine Sensing

“…Rapid, simple, and sensitive electrochemical methods with modified electrodes have shown promising platform for detection of DA. Numerous materials, such as metal nanoparticles, carbon nanotubes, fullerenes, polymers, graphene, and enzymes, have been used as modifiers to construct highly sensitive and selective DA biosensors to distinguish the coexistence of DA, AA, and UA in a biological environment [50][51][52][53][54]. Table 1 shows analytical data of DA detection in presence of AA and UA obtained from use of different modified electrodes.…”