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Temperature dependent ionic structure of phospholipid monolayers

T Seimiya, M Ashida, T Muramatsu

    Chemistry and Physics of Lipids
    |October 1, 1978
    PubMed
    Summary
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    Calcium adsorption to phospholipid monolayers shows a critical temperature around 30°C. Binding increases with temperature up to this point, then decreases, impacting ionic structure.

    Area of Science:

    • Biophysical chemistry
    • Surface science
    • Materials science

    Background:

    • Phospholipid monolayers are crucial in biological membranes and biomaterials.
    • Understanding ion interactions with these monolayers is key to many applications.
    • Calcium ions play vital roles in biological processes and material properties.

    Purpose of the Study:

    • To investigate the temperature-dependent adsorption of calcium to dipalmitoylphosphatidyl-alkanolamine monolayers.
    • To determine the effect of temperature on calcium binding constants.
    • To analyze the resulting temperature-dependent ionic structure of the ampholytic phospholipid monolayers.

    Main Methods:

    • Radiotracer techniques were employed to quantify calcium adsorption.
    • Experiments were conducted across a range of temperatures.

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  • Analysis focused on binding constants and ionic structural changes.

    • Main Results:

    • The binding constant of calcium to the phospholipid monolayer exhibited a peak around 30°C.
    • Above this critical temperature, the binding constant decreased significantly.
    • Temperature variations influenced the ionic structure of the ampholytic monolayers.

    Conclusions:

    • The adsorption of calcium to dipalmitoylphosphatidyl-alkanolamine monolayers is strongly temperature-dependent, with an optimal binding temperature around 30°C.
    • This temperature sensitivity suggests a complex interplay between calcium ions and the phospholipid monolayer's structure.
    • The findings provide insights into the behavior of phospholipid monolayers in response to thermal changes and ionic environments.