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Rapid diffusion coefficient measurements using analytical SPLITT fractionation: application to proteins

C Bor Fuh1, S Levin, J C Giddings

  • 1Department of Chemistry, University of Utah, Salt Lake City 84112.

Analytical Biochemistry
|January 1, 1993
PubMed
Summary
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This study introduces a novel method using SPLITT cells for quickly measuring diffusion coefficients. This technique accurately determines diffusion coefficients for proteins and other substances.

Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Biophysical Chemistry

Background:

  • Diffusion coefficients are crucial for understanding molecular transport.
  • Accurate measurement of diffusion coefficients is essential in various scientific fields.
  • Existing methods for diffusion coefficient measurement can be time-consuming or complex.

Purpose of the Study:

  • To develop and validate a new, rapid technique for measuring diffusion coefficients.
  • To utilize a specialized flow cell, the SPLITT (Sidestream Split Free-flow) cell, for this purpose.
  • To establish a predictable and efficient method for determining diffusion coefficients of proteins and other solutes.

Main Methods:

  • Employing a SPLITT cell designed for continuous fractionation.

Related Experiment Videos

  • Utilizing differential transport across a thin liquid lamina within the cell.
  • Measuring relative concentrations in two outlet substreams to calculate the diffusion coefficient (D).

    • Main Results:

    • The technique was successfully tested on dilute protein solutions.
    • Results demonstrated good self-consistency across different stream-splitting ratios.
    • Measured diffusion coefficients agreed with literature values within a 5% margin of error.

    Conclusions:

    • The SPLITT cell offers a simple, rapid, and predictable method for diffusion coefficient determination.
    • This technique is applicable to proteins and potentially other substances.
    • The findings contribute a valuable tool for analytical and physical chemistry research.