Efficient electrocatalytic oxidation and selective determination of isoniazid by Fe(tmphen) 3 2+ -exchanged Nafion®-modified electrode

Electrocatalytic Oxidation and Determination of Cysteine at Oxovanadium(IV) Salen Coated Electrodes

“…However, our attempts failed and VO 2+ -S could not be incorporated/adsorbed on MCM-41 type silica materials due to unknown reasons. Similarly, clay film [48,49] and Nafion film [31,32,38] coated electrodes were also examined to ion-exchange/incorporate VO 2+ -S into the respective films as per our previous procedures [50]. Surprisingly, VO 2+ -S could not be ion-exchanged/incorporated on clay and Nafion films also.…”

“…To avoid this type of problem, generally modified electrodes with immobilized electrocatalysts are used. For efficient immobilization of electrocatalysts, electrode modifiers such as Nafion, organic polymers, clays, zeolites, and sol-gel silica materials are largely used [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Coating of such electrode modifiers not only avoids the electrode poisoning but also disperses the electrocatalyst uniformly on the electrode surface and increases the active surface area [43][44][45].…”

Selective determination of isoniazid using bentonite clay modified electrodes

“…After obtaining stable redox response, the electrodes were used for electroanalytical applications or kinetic measurements. Commercial fabrication of GC/Na + -bt electrodes would be less expensive than the fabrication of GC/Nf electrodes [9] since clay is quite cheap and commercially available easily as compared to Nf. For absorption spectral studies, Na + -bt and Fe(dmbpy) 3 2+ exchanged Na + -bt films were prepared on clean glass plates similar to the films on the GC electrodes.…”

“…IZ). Our previous report [9] with Nafion ® (Nf) modified electrodes showed slow diffusion of IZ leading to low sensitivity and high detection limit. In this work, a cheap material, clay is used to achieve faster electron transfer with high sensitivity and low detection limit (vide infra).…”

“…Coating the surface of GC with a film of appropriate modifier which can accommodate/incorporate suitable electrocatalyst can achieve this goal. We have reported recently our work on the development of electrochemical sensors for nitrite, IZ and arsenite based on metal complexes of iron immobilized electrodes [8][9][10][11]. There is a wide range of modifiers (organic polymers and inorganic matrixes with or without ion exchange groups) which can be used for the purpose [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”