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Electronic speckle pattern interferometry: a tool for determining diffusion and partition coefficients for proteins

David Karlsson1, Guido Zacchi, Anders Axelsson

  • 1Department of Chemical Engineering 1, PO Box 124, SE-221 00 Lund, Sweden.

Biotechnology Progress
|December 7, 2002
PubMed
Summary

Electronic Speckle Pattern Interferometry (ESPI) accurately measures protein diffusion and partition coefficients in gels. This method provides reliable data for lysozyme, BSA, and IgG from a single experiment.

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Area of Science:

  • Biophysics
  • Materials Science
  • Analytical Chemistry

Background:

  • Accurate determination of diffusion and partition coefficients is crucial for understanding protein behavior in complex media like gels.
  • Conventional methods for measuring these coefficients can be time-consuming and may introduce variability.
  • Electronic Speckle Pattern Interferometry (ESPI) offers a novel approach for in-situ analysis.

Purpose of the Study:

  • To establish Electronic Speckle Pattern Interferometry (ESPI) as an effective technique for quantifying diffusion and partition coefficients of proteins within gels.
  • To demonstrate the advantages of ESPI, including its ability to freely select reference states and perform measurements in a single experimental run.
  • To compare the diffusion and partitioning behavior of different proteins (lysozyme, BSA, IgG) under controlled conditions.

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Main Methods:

  • Utilized ESPI with a CCD camera to capture interferometric images during protein diffusion in agarose gel.
  • Employed MATLAB to fit Fick's law to experimental data for calculating diffusion coefficients in both gel and liquid phases.
  • Determined partition coefficients by analyzing the flux condition at the gel-liquid interface.

Main Results:

  • Diffusion coefficients in 4% agarose gel were determined for lysozyme (11.2 ± 1.6), BSA (4.8 ± 0.6), and IgG (3.0 ± 0.3) x 10⁻¹² m²/s.
  • Partition coefficients were found to be 0.65 ± 0.04 for lysozyme, 0.44 ± 0.06 for BSA, and 0.51 ± 0.04 for IgG.
  • ESPI provided accurate and comparable data for diffusion and partition coefficients from a single experimental setup.

Conclusions:

  • ESPI is a powerful, user-friendly tool for simultaneously determining protein diffusion and partition coefficients in gels.
  • The method enhances reliability by enabling direct comparison of diffusants within the same experimental framework.
  • The study successfully quantified key transport properties for lysozyme, BSA, and IgG in agarose gel, validating ESPI's utility.