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    This study shows that mixed micelles formed from triblock copolymer and alpha-casein can encapsulate hydrophobic compounds. These micelles, with a proposed "necklace and bead" structure, solubilize pyrene effectively.

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    Area of Science:

    • Colloid and Surface Science
    • Biophysical Chemistry
    • Materials Science

    Background:

    • Micelles serve as potential delivery systems for bioactive compounds.
    • Triblock copolymer (PEO13-PPO30-PEO13) and alpha-casein exhibit miscibility within specific conditions.
    • Understanding mixed micelle formation is crucial for encapsulation applications.

    Purpose of the Study:

    • To test the hypothesis that mixed micelles of PEO13-PPO30-PEO13 and alpha-casein form.
    • To investigate the ability of these mixed micelles to solubilize hydrophobic compounds.
    • To elucidate the molecular arrangement within the mixed micelles.

    Main Methods:

    • Fluorescence spectroscopy using pyrene as a hydrophobic probe.
    • Analysis of pyrene fluorescence emission spectra (I1/I3 and Iex/I1 ratios).
    • Evaluation of tryptophan emission spectra to assess the microenvironment.

    Main Results:

    • Micelles were formed across all tested casein mole fractions.
    • Successful solubilization of the hydrophobic probe pyrene was observed.
    • Antagonistic mixing indicated by the interaction parameter (beta), likely due to steric hindrance.
    • Tryptophan residues were found in a hydrophobic environment above the critical micelle concentration (CMC).

    Conclusions:

    • Mixed micelles of PEO13-PPO30-PEO13 and alpha-casein are formed and can solubilize hydrophobic molecules.
    • A proposed "necklace and bead" model suggests hydrophobic polymer segments interact with casein hydrophobic regions.
    • The molecular arrangement places tryptophan residues in a hydrophobic core, supporting the proposed model.