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An extrapolation method for reducing equilibration times in sedimentation equilibrium experiments

J J Correia, D A Yphantis

    Biophysical Journal
    |November 1, 1977
    PubMed
    Summary
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    This study introduces an extrapolation technique to speed up sedimentation equilibrium experiments. The Aitken transformation significantly reduces running times, offering substantial time savings with accurate optical systems.

    Area of Science:

    • Biophysical Chemistry
    • Analytical Chemistry

    Background:

    • Sedimentation equilibrium experiments are crucial for determining molecular weights and interactions.
    • Traditional methods can be time-consuming, limiting experimental throughput.

    Purpose of the Study:

    • To investigate an extrapolation technique for accelerating sedimentation equilibrium experiments.
    • To quantify the time savings achieved by the proposed method.

    Main Methods:

    • Application of the Aitken transformation to concentration profiles obtained at various time intervals.
    • Mathematical analysis of the convergence rate of extrapolated profiles to equilibrium.

    Main Results:

    • The Aitken transformation accelerates convergence to equilibrium concentration profiles.

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  • Time savings range from 2x for meniscus depletion to 4-8x for lower speeds or smaller molecular weights.
  • The technique's sensitivity to noise necessitates accurate optical detection systems.

    • Conclusions:

    • The extrapolation technique offers significant reductions in sedimentation equilibrium experiment durations.
    • Optimal use requires high-precision optical measurement systems to mitigate noise interference.
    • This method enhances efficiency in biophysical and analytical characterization.