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Cited by 295

The DOI matches its Crossref record; 36 of the 36 references it cites were found in a registry or an index.

Microelectrodes for the Measurement of Catecholamines in Biological Systems

Cahill, Paula S., Walker, Q. David, Finnegan, Jennifer M., Mickelson, George E., Travis, Eric R., Wightman, R. Mark·1996·Analytical Chemistry

Abstract

Many of the molecules involved in biological signaling processes are easily oxidized and have been monitored by electrochemical methods. Temporal response, spatial considerations, and sensitivity of the electrodes must be optimized for the specific biological application. To monitor exocytosis from single cells in culture, constant potential amperometry offers the best temporal resolution, and a low-noise picoammeter improves the detection limits. Smaller electrodes, with 1-micron diameters, provided spatial resolution sufficient to identify the locations of release sites on the surface of single cells. For the study of neurotransmitter release in vivo, larger cylindrical microelectrodes are advantageous because the secreted molecules come from multiple terminals near the electrode, and the greater amounts lead to a larger signal that emerges from the Johnson noise of the current amplifier. With this approach, dopamine release elicited by two electrical stimulus pulses at 10 Hz was detected with fastscan cyclic voltammetry in vivo. Nafion-coated elliptical electrodes have previously been shown to be incapable of detecting such concentration changes without extensive signal averaging. In addition, we demonstrate that high-pass filtering (200 Hz) of cyclic voltammograms recorded at 300 V/s decreases the background current and digitization noise at these microelectrodes, leading to an improved signal. Also, high-pass filtering discriminated against ascorbic acid, DOPAC, and acidic pH changes, three common interferences in vivo.

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Crossref · 10.1021/ac960347d

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Metadata

Authors
Cahill, P. S., Walker, Q. D., Finnegan, J. M., Mickelson, G. E., Travis, E. R., & Wightman, R. M.
Venue
Analytical Chemistry
Published
1996-01-01
Volume
68
Issue
18
Pages
3180-3186
ISSN
  • 0003-2700 (ISSN-L)
  • 1520-6882
OpenAlex
W2013195053
Cited by
295
References
36
FWCI
6.71
Type
journal article
Language
en
Open access
closed

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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