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Related Experiment Videos

L-lactate measures in brain tissue with ceramic-based multisite microelectrodes.

Jason J Burmeister1, Michael Palmer, Greg A Gerhardt

  • 1Department of Anatomy, Center for Sensor Technology, The Morris K. Udall Parkinson's Disease Research Center of Excellence, University of Kentucky Chandler Medical Center, Room 306 Davis Mills Building, Lexington, KY 40536-0098, USA.

Biosensors & Bioelectronics
|February 1, 2005
PubMed
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A new microelectrode accurately measures L-lactate in vivo. This biosensor is selective and fast, ideal for brain research and detecting real-time L-lactate changes.

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Analytical Chemistry

Background:

  • L-lactate is a crucial metabolite in brain function.
  • Accurate in vivo monitoring of L-lactate is essential for understanding neurological processes.
  • Existing methods for L-lactate measurement face challenges in selectivity and real-time application.

Purpose of the Study:

  • To develop and characterize a novel multisite array microelectrode for in vivo L-lactate quantification.
  • To evaluate the microelectrode's performance, including linearity, detection limits, selectivity, and response time.
  • To demonstrate the microelectrode's capability for measuring endogenous L-lactate changes in brain tissue.

Main Methods:

  • Fabrication of a three-layer microelectrode: Nafion for anion repulsion, L-lactate oxidase for L-lactate conversion, and polyurethane for range adjustment.

Related Experiment Videos

  • Enzymatic conversion of L-lactate to hydrogen peroxide (H2O2).
  • Electrochemical quantification of H2O2 at platinum recording sites.

    • Main Results:

    • Microelectrodes exhibited linearity up to 20 mM L-lactate (R2 = 0.997 +/- 0.001).
    • Achieved low detection limits of 0.078 +/- 0.013 mM.
    • Demonstrated high selectivity, suitable for in vivo brain measurements due to low interference from other neurochemicals.

    Conclusions:

    • The developed L-lactate microelectrode is a sensitive, selective, and rapid tool for in vivo measurements.
    • It is well-suited for monitoring endogenous L-lactate dynamics in the brain.
    • Preliminary in vivo studies in rats confirm its ability to detect rapid L-lactate changes.