Electrochemical studies of the oxidation mechanism of polyamide on glassy carbon electrode

Studies on Electrochemical Oxidation Mechanisms of Polyamides Containing N-Methylpyrrole and N-Methylimidazole by Electrospray Ionization Tandem Mass Spectrometry

“…In previous work we observed that the potentials of the three anodic peaks, Ia and IIa of polyamide 1 and IIIa of polyamide 2 , depend on the solution pH, in which three potentials shift negatively with increasing pH. The three slopes of the fitted lines from E −pH curves are close to the theoretical value of −0.0591 V/pH unit, suggesting that the same number of electrons and protons is involved in the oxidation processes.…”

“…The numbers of peaks suggest that polyamide 1 was oxidized by two steps, while polyamide 2 may be oxidized by one step. Furthermore, the appearance of two shoulder peaks following IIIa indicates that the oxidation of the two imidazole rings have slight close peak potentials, and pyrrole ring in polyamide 2 In previous work 9 we observed that the potentials of the three anodic peaks, Ia and IIa of polyamide 1 and IIIa of polyamide In the MS/MS spectrum of [M + 16 + H] + , the ion at m/z 475 ([M + 16 + H -126] + ) was produced from NO 2 Imextrusion by a 1 fragmentation, which means that the first oxygen atom was not added to the imidazole ring with a nitro group. In the MS/MS spectrum of [M + 32 + H] + , the loss of PyγDp fragment from [M + 32 + H] + yields the ion at m/z 325 by c 2 cleavage (Figure 3b), which suggests the second oxygen atom is added into the outer imidazole (the one with a nitro group).…”

Electrochemistry of deoxyribonucleic acid–cetyltrimethylammonium complex with considering O2 effect

“…The oxidation of DNA-CTMA at~0.5 V is also related to the deprotonation besides its sensitivity to O 2 . No detectable peak is observed when NaOH content is lower than 0.05 M. Many experimental and theoretical results show that Guanine (G) is the most electroactive base in DNA chain [28,[39][40][41][42][43][44][45][46]. Usually, G loses its electron at~0.7 V, while Adenine (A) is oxidized at~0.85 V. In addition, the oxidation potential may shift positively due to the position of bases in DNA chains.…”

Direct electrochemical detection of sodium azide in physiological saline buffers using highly boron-doped diamond electrodes

“…We proposed the possibility of the imidazole effect is due to an adsorption problem. Electrochemical oxidation of imidazole has been reported to form the oligomers in which imidazole moieties are linked by N N bonds [22,23]. This product is estimated to adsorb on the surface of the electrode, resulting in shifting of the oxidation peak potential.…”