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Related Experiment Videos

Microchip device for performing enzyme assays

A G Hadd1, D E Raymond, J W Halliwell

  • 1Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Tennessee 37831-6142, USA.

Analytical Chemistry
|September 1, 1997
PubMed
Summary
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This study presents an automated microfluidic enzyme assay for beta-galactosidase (beta-Gal). The system precisely mixes reagents in nanoliter volumes, significantly reducing reagent consumption for efficient kinetic analysis.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Microfluidics

Background:

  • Enzyme assays traditionally require large reagent volumes and time.
  • Microfluidic devices offer potential for miniaturization and automation of biochemical assays.
  • Automating enzyme kinetics studies can improve efficiency and reduce costs.

Purpose of the Study:

  • To develop and validate an automated microfluidic system for enzyme assays.
  • To determine kinetic parameters (Michaelis-Menten constants) and inhibitor constants for beta-galactosidase on-chip.
  • To demonstrate the significant reduction in reagent consumption using the microfluidic platform.

Main Methods:

  • Enzyme assays were conducted in a microfabricated channel network using electrokinetic flow for precise reagent mixing.

Related Experiment Videos

  • Beta-galactosidase (beta-Gal) activity was measured using resorufin beta-D-galactopyranoside (RBG) and laser-induced fluorescence.
  • Michaelis-Menten kinetics and inhibitor constants were determined by varying substrate and inhibitor concentrations on-chip.

    • Main Results:

    • On-chip determination of Michaelis-Menten constants for beta-Gal showed good agreement with conventional assays.
    • The inhibition constant (Ki) for phenylethyl beta-D-thiogalactoside (PETG) was determined to be 8 microM.
    • Reagent consumption was reduced by four orders of magnitude, requiring only picograms of enzyme and nanograms of substrate for a 20-minute assay.

    Conclusions:

    • Automated microfluidic enzyme assays are feasible and highly efficient.
    • The developed system enables rapid kinetic analysis and inhibitor screening with minimal reagent use.
    • Microfluidic platforms represent a significant advancement for biochemical assays, reducing waste and cost.