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Related Experiment Videos

The concentration dependence of the hemoglobin mutual diffusion coefficient

S S Alpert, G Banks

    Biophysical Chemistry
    |May 1, 1976
    PubMed
    Summary

    Laser correlation spectroscopy measured the diffusion of human cyanomethemoglobin. The diffusion coefficient decreased with protein concentration, allowing estimation of values within red blood cells.

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    Area of Science:

    • Biophysics
    • Physical Chemistry

    Background:

    • Hemoglobin diffusion is crucial for oxygen transport.
    • Understanding diffusion coefficients at varying concentrations is key to cellular function.

    Purpose of the Study:

    • To measure the mutual diffusion coefficient (D) of human cyanomethemoglobin (Fe+++:CN) across a range of protein concentrations.
    • To investigate the relationship between diffusion and protein concentration.
    • To test theoretical models for diffusion in concentrated protein solutions.

    Main Methods:

    • Laser correlation spectroscopy was employed.
    • Measurements were conducted at 20°C in a 0.1 M phosphate buffer at pH 7.0.
    • Human cyanomethemoglobin solutions at varying concentrations were analyzed.

    Main Results:

    • At low concentrations, D = (6.43 ± 0.26) x 10⁻⁷ cm²/s.
    • A near-linear decrease in D was observed with increasing protein concentration.
    • The linear frictional volume fraction coefficient (Kf) was determined to be 7.75.
    • Extrapolated D at red blood cell concentration is estimated at 4.25 x 10⁻⁷ cm²/s.

    Conclusions:

    • The diffusion coefficient of human cyanomethemoglobin decreases linearly with concentration.
    • The generalized Stokes-Einstein relation, with a hard-sphere model and hydrodynamic interaction integral, fits high-concentration data.
    • This study provides insights into hemoglobin's behavior within the crowded cellular environment.

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