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Related Experiment Videos

Acrylic/cyclodextrin hydrogels with enhanced drug loading and sustained release capability.

Ulf Siemoneit1, Christoph Schmitt, Carmen Alvarez-Lorenzo

  • 1Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain.

International Journal of Pharmaceutics
|February 9, 2006
PubMed
Summary

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Acrylamidomethyl-gamma-cyclodextrin enhanced acrylic acid hydrogels for drug delivery. These modified hydrogels significantly increased loading of hydrophobic triamcinolone acetonide and provided sustained release, while showing limited effect on hydrophilic propranolol.

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Drug Delivery Systems

Background:

  • Hydrogels are versatile polymeric networks with applications in drug delivery.
  • Loading and releasing hydrophobic drugs from hydrogels remains a challenge.
  • Cyclodextrins are known for their ability to form inclusion complexes with hydrophobic molecules.

Purpose of the Study:

  • To evaluate the influence of acrylamidomethyl-gamma-cyclodextrin (gamma-CD-NMA) on the loading and release of triamcinolone acetonide (TA) and propranolol (PR) by acrylic acid hydrogels.
  • To investigate the potential of copolymerizing cyclodextrins with acrylic monomers for enhanced drug delivery.

Main Methods:

  • Synthesis of gamma-CD-NMA via condensation of gamma-cyclodextrin (gamma-CD) with N-(hydroxymethyl) acrylamide.

Related Experiment Videos

  • Preparation of acrylic acid hydrogels incorporating varying amounts of gamma-CD-NMA using free radical polymerization.
  • Evaluation of hydrogel swelling, drug loading capacity (TA and PR), and drug release kinetics under different conditions.

    • Main Results:

    • Hydrogels with gamma-CD-NMA (above 5%) showed a significantly higher capacity to load hydrophobic TA (33 mg/g vs. 0.6 mg/g without gamma-CD-NMA) due to inclusion complex formation.
    • Sustained release of TA for at least 24 hours was observed, independent of pH and medium composition.
    • Loading and controlled release of hydrophilic PR were not significantly improved by gamma-CD-NMA, with rapid release (<2 hours) observed, attributed to strong electrostatic interactions with the hydrogel network.

    Conclusions:

    • Copolymerization of gamma-cyclodextrin with acrylic monomers creates pH-sensitive hydrogels with high loading capacity for hydrophobic drugs.
    • These modified hydrogels offer sustained release of hydrophobic drugs, overcoming limitations of conventional hydrogels.
    • The incorporation of gamma-CD-NMA did not enhance the loading or controlled release of hydrophilic drugs like propranolol.