Dataset Information

Phenyliminophenothiazine based self-organization of polyaniline nanowires and application as redox probe in electrochemical sensors.

ABSTRACT: Synthesis and application of nanostructured materials applicable in the assembly of electrochemical sensors is one of the important trends in material sciences and analytical chemistry. In this work, we have proposed and implemented simple non-template method for assembling nanofibers from the polyaniline ultrasonicated with phenyliminophenothiazine in aqueous media. Two-step procedure including association with emeraldine dispersion and reorganization under ultrasonication led to formation of nanofibrillar structures with average diameter of 20?nm. UV-spectroscopy confirms that association of phenyliminophenothiazine and polyaniline in acidic medium resulted in an intense absorption band at 900-910?nm due to donor-acceptor interaction between the reactants. The material combined emeraldine charge transmission with redox activity of phenyliminophenothiazine was found promising for electrochemical sensing. It was confirmed by comparison of characteristics of appropriate solid-contact sensors based on emeraldine and phenyliminophenothiazine toward Fe(III) ions, ascorbic acid and hydroquinone. In all the cases, the use of phenyliminophenothiazine results in a wider concentration range and more reproducible signal against characteristics of similar sensor based on polyaniline. The applicability of the sensor was confirmed by determination of iron content in commercial medication.

SUBMITTER: Khadieva AI

PROVIDER: S-EPMC6344644 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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Phenyliminophenothiazine based self-organization of polyaniline nanowires and application as redox probe in electrochemical sensors.

Khadieva Alena I AI Gorbachuk Vladimir V VV Evtugyn Gennady A GA Belyakova Svetlana V SV Latypov Ruslan R RR Drobyshev Sergey V SV Stoikov Ivan I II

Scientific reports 20190123 1

Synthesis and application of nanostructured materials applicable in the assembly of electrochemical sensors is one of the important trends in material sciences and analytical chemistry. In this work, we have proposed and implemented simple non-template method for assembling nanofibers from the polyaniline ultrasonicated with phenyliminophenothiazine in aqueous media. Two-step procedure including association with emeraldine dispersion and reorganization under ultrasonication led to formation of n ...[more]

PMID: 30674972

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Project description:Recent years have seen the development of a large number of electrochemical sandwich assays and reagentless biosensor architectures employing biomolecules modified via the attachment of a redox-active "reporter." Here we survey a large set of potential redox reporters in order to determine which exhibits the best long-duration stability in thiol-on-gold monolayer-based sensors and to identify reporter "sets" signaling at distinct, nonoverlapping redox potentials in support of multiplexing and error correcting ratiometric or differential measurement approaches. Specifically, we have characterized the performance of more than a dozen potential reporters that are, first, redox active within the potential window over which thiol-on-gold monolayers are reasonably stable and, second, are available commercially in forms that are readily conjugated to biomolecules or can be converted into such forms in one or two simple synthetic steps. To test each of these reporters we conjugated it to one terminus of a single-stranded DNA "probe" that was attached by its other terminus via a six-carbon thiol to a gold electrode to form an "E-DNA" sensor responsive to its complementary DNA target. We then measured the signaling properties of each sensor as well as its stability against repeated voltammetric scans and against deployment in and reuse from blood serum. Doing so we find that the performance of methylene blue-based, thiol-on-gold sensors is unmatched; the near-quantitative stability of such sensors against repeated scanning in even very complex sample matrices is unparalleled. While more modest, the stability of sensors employing a handful of other reporters, including anthraquinone, Nile blue, and ferrrocene, is reasonable. Our work thus serves as both to highlight the exceptional properties of methylene blue as a redox reporter in such applications and as a cautionary tale-we wish to help other researchers avoid fruitless efforts to employ the many, seemingly promising and yet ultimately inadequate reporters we have investigated. Finally, we hope that our work also serves as an illustration of the pressing need for the further development of useful redox reporters.

Dataset Information

Phenyliminophenothiazine based self-organization of polyaniline nanowires and application as redox probe in electrochemical sensors.

Publications

Phenyliminophenothiazine based self-organization of polyaniline nanowires and application as redox probe in electrochemical sensors.

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