Electrocatalytic oxidation of NADH at graphene-modified electrodes based on electropolymerized poly(thionine-methylene blue) films from nature deep eutectic solvents

Voltammetric Sensor for Doxorubicin Determination Based on Self-Assembled DNA-Polyphenothiazine Composite

“…If the maximal potential was chosen below this value, no significant changes were observed on multiple cycling. Similar activation of the polymerization at high anodic potential was reported for the electropolymerization of aniline and phenothiazine dyes [47,56]. Increasing the number of the cycles of the potential between −0.5 and 1.3 V consecutively increased the peaks attributed to the products of electrosynthesis (0.4 V on anodic branch of the voltammogram and 0.2 V at the cathodic branch).…”

“…As examples, electropolymerization of thionine [ 41 ], methylene blue [ 42 ], methylene green [ 43 ], azure A [ 44 ], and azure B [ 45 ] can be mentioned. Appropriate polymeric products improved the conditions of the electron exchange and demonstrated catalytic activity in the conversion of hydrogen peroxide [ 46 ] and NADH [ 47 ]. Meanwhile, spontaneous aggregation and limited solubility of the monomeric dyes affects the regularity of the polymer films obtained and the reproducibility of the modifier properties.…”

Synergistic Applications of Graphene-Based Materials and Deep Eutectic Solvents in Sustainable Sensing: A Comprehensive Review

“…Again, Hu and collaborators proposed a modification of a glassy carbon electrode for the electrocatalytic oxidation of NADH with an approach similar to the previously mentioned one, except for the fact that they used a ternary NADES (choline chloride, malic acid, and H 2 O at a molar ratio of 1:1:2, and choline chloride, glucose, and H 2 O at a molar ratio of 1:1:11) as the DES (see Figure 4 ) [ 98 ]. Excellent electrocatalytic activity was displayed by the sensor functionalized with this combination of materials, with a high degree of reproducibility (the maximum relative standard deviation (RSD%) ranged from 3.65 to 4.32%), a large linear range (0.51–3333.33 µM), a low LOD (0.159 nM), and good stability (4 weeks).…”

“…( b ) Fabrication of the PTH-MB NADES and PTH-MB NADES -ERG electrodes. ( c ) The proposed NADH measurement mechanism on the proposed electrode [ 98 ]. Reproduced with permission from Elsevier.…”