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Electrocatalytic oxidation of NADH in a new nanostructured interface with an entrapped butylpyrene nitroaromatic derivative

dc.contributor.authorMoscoso R.
dc.contributor.authorBarrientos C.
dc.contributor.authorMoris S.
dc.contributor.authorSquella J.A.
dc.date.accessioned2020-09-02T22:23:42Z
dc.date.available2020-09-02T22:23:42Z
dc.date.issued2019
dc.identifier10.1016/j.jelechem.2019.02.013
dc.identifier.citation837, , 48-54
dc.identifier.issn15726657
dc.identifier.urihttps://hdl.handle.net/20.500.12728/5456
dc.descriptionIn a previous study, we revealed a new way to modify multi-walled carbon nanotubes (MWCNTs) with 3,5-dinitrobenzoic acid (35DNB). Furthermore, we proved that a 35DNB-MWCNTGC electrode efficiently catalysed the oxidation of NADH. In this paper, with the aim of obtaining a stronger bond of the electrocatalytic mediator 35DNB with the MWCNTs, we have synthesized a modified compound of 35DNB. The modification consisted of adding a 4-(piren-1-yl)butyl terminal to 35DNB to form 4-(pyren-1-yl)butyl 3,5-dinitrobenzoate (35DNBpy). The synthesis of 35DNBpy was obtained with a yield of 78.3% (mp = 202–204 °C). With this change, we improved the electrocatalytic activity by several oxidation cycles, conferring electrocatalytic stability. The preparation and modification of electrodes with carbon nanotubes and 35DNBpy is fast and simple. The electrochemical study was performed by cyclic voltammetry in 3 mM NADH solutions. Oxidation of NADH occurs at 0.1 (V vs Ag/AgCl) in aqueous media at pH 7 and the same electrode can be used for up to 50 min. In this work, the electrocatalytic activity of new modified electrodes with MWCNTs and 35DNBpy is reported. The electrocatalytic activity was evaluated by cyclic voltammetry. The electrocatalytic capacity of the electrode and the heterogeneous electron transfer rate constant were calculated. Sensitivity of the modified electrode 35DNBpy/MWCNT/GCE is measured by voltammetric method which showed linear variation with NADH concentration with limit of detection (LOD) and sensitivity of 0.885 μM (3S/N) and 0.33 μA/μM, respectively. © 2019 Elsevier B.V.
dc.language.isoen
dc.publisherElsevier B.V.
dc.subjectButylpyrene nitroaromatic derivative
dc.subjectCarbon nanotube
dc.subjectElectrocatalysis
dc.subjectElectrode modification
dc.subjectNADH
dc.subjectAromatic compounds
dc.subjectCarbon nanotubes
dc.subjectCatalysis
dc.subjectCyclic voltammetry
dc.subjectElectrocatalysis
dc.subjectElectrodes
dc.subjectNanotubes
dc.subjectOxidation
dc.subjectRate constants
dc.subjectSensitivity analysis
dc.subjectYarn
dc.subjectElectro-catalytic oxidation
dc.subjectElectrocatalytic activity
dc.subjectElectrochemical studies
dc.subjectElectrode modification
dc.subjectHeterogeneous electron transfer rate constant
dc.subjectModified electrodes
dc.subjectNADH
dc.subjectVoltammetric methods
dc.subjectMultiwalled carbon nanotubes (MWCN)
dc.titleElectrocatalytic oxidation of NADH in a new nanostructured interface with an entrapped butylpyrene nitroaromatic derivative
dc.typeArticle


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