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Advances and Perspectives in Chemical Imaging in Cellular Environments Using Electrochemical Methods

1
Department of Chemistry, University of Cincinnati, Cincinnati, OH 45219, USA
2
Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH 45219, USA
*
Author to whom correspondence should be addressed.
Chemosensors 2018, 6(2), 24; https://doi.org/10.3390/chemosensors6020024
Received: 23 April 2018 / Revised: 22 May 2018 / Accepted: 23 May 2018 / Published: 29 May 2018
(This article belongs to the Special Issue Advances in Chemical Imaging and its Applications)
This review discusses a broad range of recent advances (2013–2017) in chemical imaging using electrochemical methods, with a particular focus on techniques that have been applied to study cellular processes, or techniques that show promise for use in this field in the future. Non-scanning techniques such as microelectrode arrays (MEAs) offer high time-resolution (<10 ms) imaging; however, at reduced spatial resolution. In contrast, scanning electrochemical probe microscopies (SEPMs) offer higher spatial resolution (as low as a few nm per pixel) imaging, with images collected typically over many minutes. Recent significant research efforts to improve the spatial resolution of SEPMs using nanoscale probes and to improve the temporal resolution using fast scanning have resulted in movie (multiple frame) imaging with frame rates as low as a few seconds per image. Many SEPM techniques lack chemical specificity or have poor selectivity (defined by the choice of applied potential for redox-active species). This can be improved using multifunctional probes, ion-selective electrodes and tip-integrated biosensors, although additional effort may be required to preserve sensor performance after miniaturization of these probes. We discuss advances to the field of electrochemical imaging, and technological developments which are anticipated to extend the range of processes that can be studied. This includes imaging cellular processes with increased sensor selectivity and at much improved spatiotemporal resolution than has been previously customary. View Full-Text
Keywords: SEPM; SECM; SICM; biosensors; high-resolution imaging; ion channels; microelectrode arrays SEPM; SECM; SICM; biosensors; high-resolution imaging; ion channels; microelectrode arrays
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Lazenby, R.A.; White, R.J. Advances and Perspectives in Chemical Imaging in Cellular Environments Using Electrochemical Methods. Chemosensors 2018, 6, 24.

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