Publication

On-chip non-invasive voltage clamp on Xenopus oocytes

Martinus Adela Maria Gijs, Thomas Lehnert
2005
Conference Papers

Abstract

In order to improve the throughput of the traditional “Two Electrode Voltage Clamp” (TEVC) measurements on Xenopus oocytes, we present here a chip-based non-invasive technique for the measurement of ion channels activity. We focus especially on the integration of the electrical measurement site into a microfluidic structure, allowing rapid exchange of various small-volume solutions.

Official source

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Martinus Adela Maria Gijs, Thomas Lehnert
2005
Conference Papers

Abstract

Official source

Related concepts (25)

Microfluidics

Microfluidics refers to a system that manipulates a small amount of fluids ((10−9 to 10−18 liters) using small channels with sizes ten to hundreds micrometres. It is a multidisciplinary field that involves molecular analysis, biodefence, molecular biology, and microelectronics. It has practical applications in the design of systems that process low volumes of fluids to achieve multiplexing, automation, and high-throughput screening.

Voltage clamp

The voltage clamp is an experimental method used by electrophysiologists to measure the ion currents through the membranes of excitable cells, such as neurons, while holding the membrane voltage at a set level. A basic voltage clamp will iteratively measure the membrane potential, and then change the membrane potential (voltage) to a desired value by adding the necessary current. This "clamps" the cell membrane at a desired constant voltage, allowing the voltage clamp to record what currents are delivered.

Voltage-gated ion channel

Voltage-gated ion channels are a class of transmembrane proteins that form ion channels that are activated by changes in the electrical membrane potential near the channel. The membrane potential alters the conformation of the channel proteins, regulating their opening and closing. Cell membranes are generally impermeable to ions, thus they must diffuse through the membrane through transmembrane protein channels. They have a crucial role in excitable cells such as neuronal and muscle tissues, allowing a rapid and co-ordinated depolarization in response to triggering voltage change.

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On-chip non-invasive voltage clamp on Xenopus oocytes

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