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Alginate-hydroxypropylcellulose hydrogel microbeads for alkaline phosphatase encapsulation.

A Karewicz1, K Zasada, D Bielska

  • 1Faculty of Chemistry, Jagiellonian University , 30-060 Kraków, Ingardena 3 , Poland .

Journal of Microencapsulation
|July 10, 2013
PubMed
Summary

This study developed novel hydrogel microparticles for enhanced protein delivery. The system demonstrated sustained release of active alkaline phosphatase (ALP), showing potential for therapeutic applications.

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Protein Therapeutics

Background:

  • Proteins are valuable therapeutic agents but face challenges with stability and bioavailability.
  • Developing effective delivery systems is crucial for successful protein-based therapies.

Purpose of the Study:

  • To engineer novel hydrogel microparticles for improved protein delivery.
  • To encapsulate alkaline phosphatase (ALP) within alginate/hydroxypropylcellulose (ALG-HPC) microparticles.
  • To characterize the release kinetics and bioactivity of encapsulated ALP.

Main Methods:

  • Protein encapsulation within physically cross-linked sodium alginate/hydroxypropylcellulose (ALG-HPC) hydrogel microparticles.
  • Characterization of microparticle morphology and size using optical microscopy and SEM.

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  • Assessment of ALP release profiles under physiological conditions (pH 7.4, 37°C) for chitosan-coated microspheres.
  • Evaluation of released ALP activity through induced mineralization assays.
  • Analysis of mineral formation using SEM, AFM, FTIR, and XRD.

    • Main Results:

    • Spherical ALG-HPC microparticles (∼4 µm) were successfully fabricated.
    • Controlled release of active ALP was achieved with chitosan-coated microspheres, exhibiting no initial burst effect.
    • Induced mineralization confirmed the bioactivity of released ALP.
    • FTIR and XRD analyses confirmed the formation of hydroxyapatite mineral.

    Conclusions:

    • ALG-HPC hydrogel microparticles represent a promising platform for the sustained and active delivery of protein therapeutics.
    • The developed system overcomes limitations of protein stability and bioavailability.
    • The ability to induce mineralization highlights the therapeutic potential of this delivery system.