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Interaction between cholesterol and calcium ions in solution.

S P Marfey, R Van Meter, M E Bartlet

    Zeitschrift Fur Naturforschung. Section C, Biosciences
    |November 1, 1975
    PubMed
    Summary
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    Complex formation between cholesterol and calcium chloride dihydrate was detected using dialysis. This complex formation significantly slowed dialysis rates through cellulose membranes but accelerated them through protein membranes.

    Area of Science:

    • Biochemistry
    • Physical Chemistry

    Background:

    • Cholesterol and calcium chloride dihydrate are important biological and chemical compounds.
    • Understanding their interactions is crucial for various scientific applications.

    Purpose of the Study:

    • To investigate the dialysis rates of cholesterol and calcium chloride dihydrate separately and as a mixture.
    • To characterize the interaction between cholesterol and calcium chloride dihydrate in 90% aqueous dioxane.

    Main Methods:

    • Dialysis experiments using Visking cellulose and natural protein membranes.
    • Determination of half-escape times (t1/2) for individual components and their mixture.
    • Milliosmolality measurements using freezing point depression.

    Main Results:

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    • Dialysis rates differed significantly between cellulose and protein membranes.
    • A complex formed between cholesterol and calcium chloride dihydrate, with an association constant of 3.9 X 10(14).
    • Complex formation reduced osmotically active particles in the mixture.

    Conclusions:

    • Complexation between cholesterol and calcium chloride dihydrate was confirmed through dialysis and milliosmolality studies.
    • The nature of the membrane influences the observed dialysis rates of the complex.