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Tsujimura A, Kamae Y, Kawasaki H, Nagai H, Kano M, Tabata T. Carbon powder-filled microelectrode: An easy-to-fabricate probe for cellular electrochemistry. Anal Biochem 2021; 629:114316. [PMID: 34314725 DOI: 10.1016/j.ab.2021.114316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 07/05/2021] [Accepted: 07/23/2021] [Indexed: 10/20/2022]
Abstract
Carbon fiber and carbon fiber disc microelectrodes are widely used for electrochemical detection of biochemicals released from cells. However, fabricating these types of microelectrodes is difficult and time-consuming. Here, we report an easy-to-fabricate, carbon powder-filled microelectrode consisting of a pulled glass capillary backfilled with carbon powder. Carbon tip size and responsiveness can be controlled by adjusting the settings of the puller. Carbon powder-filled microelectrodes with tip opening diameters of 7-24 μm detected sub-micromolar to sub-millimolar levels of dopamine and catecholamines released from PC-12 cells. This simple microelectrode should promote further work on cellular and tissue electrochemistry.
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Affiliation(s)
- Asuka Tsujimura
- Laboratory for Biological Information Processing, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan.
| | - Yuhi Kamae
- Laboratory for Biological Information Processing, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan.
| | - Hikaru Kawasaki
- Laboratory for Biological Information Processing, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan.
| | - Haruki Nagai
- Laboratory for Biological Information Processing, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan.
| | - Masanobu Kano
- Department of Neurophysiology, Graduate School of Medicine, The University of Tokyo, Tokyo, 113-0033, Japan; International Research Center for Neurointelligence (WPI-IRCN), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo, Tokyo, 113-0033, Japan.
| | - Toshihide Tabata
- Laboratory for Biological Information Processing, Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan.
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