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Amylose-iodine complex. I. Sedimentation behavior

F R Dintzis, A C Beckwith, G E Babcock

    Macromolecules
    |May 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    Sedimentation studies reveal that blue amylose-iodine complexes aggregate, significantly increasing sedimentation coefficients. This aggregation is the primary cause of the observed changes in sedimentation behavior, particularly in iodine-saturated solutions.

    Area of Science:

    • Biochemistry
    • Polymer Science

    Background:

    • Amylose-iodine complexes are crucial in carbohydrate chemistry and have applications in various fields.
    • Understanding the solution behavior of these complexes is essential for controlling their properties.

    Purpose of the Study:

    • To investigate the sedimentation behavior of blue amylose-iodine complexes.
    • To determine the factors influencing the sedimentation coefficients of these complexes.

    Main Methods:

    • Sedimentation measurements were performed on solutions of amylose fractions (B and F2) complexed with iodine.
    • The effect of potassium iodide concentration on sedimentation coefficients was analyzed.
    • Time-dependent changes in sedimentation were observed for saturated and unsaturated solutions.

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    Main Results:

    • Amylose-iodine complexes formed polydisperse solutions with limited solubility and stability.
    • Sedimentation coefficients increased with increasing potassium iodide concentration for both amylose fractions.
    • Sedimentation coefficients were independent of amylose concentration at constant potassium iodide levels.
    • For iodine-saturated complexes, sedimentation coefficients were significantly higher than for parent amylose.

    Conclusions:

    • Aggregation of amylose-iodide complexes is the main mechanism responsible for the observed increase in sedimentation coefficients.
    • Polyelectrolytic charge effects may play a role but aggregation is the dominant factor.
    • The study provides insights into the solution stability and behavior of amylose-iodine complexes.