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Related Experiment Videos

Drug release from new bioartificial hydrogel

J C Gayet1, G Fortier

  • 1Département de chimie-biochimie, Université du Québec à Montréal, Canada.

Artificial Cells, Blood Substitutes, and Immobilization Biotechnology
|January 1, 1995
PubMed
Summary

High water content hydrogels made from bovine serum albumin and poly(ethylene glycol) effectively control the release of various substances, including proteins. Release rates depend on hydrogel porosity, influenced by poly(ethylene glycol) molecular weight.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery Systems

Background:

  • Hydrogels are widely explored for controlled release applications due to their high water content and biocompatibility.
  • Bovine serum albumin (BSA) and poly(ethylene glycol) (PEG) are common biopolymers with potential for creating advanced hydrogel systems.

Purpose of the Study:

  • To investigate the efficacy of high water content hydrogels, formed by BSA-PEG copolymerization, as a controlled release system.
  • To evaluate the release kinetics of both soluble and hydrophobic substances, including proteins, from these BSA-PEG hydrogels.
  • To determine the influence of hydrogel porosity, modulated by PEG molecular weight, on drug diffusion.

Main Methods:

  • Copolymerization of bovine serum albumin (BSA) and poly(ethylene glycol) (PEG) to form high water content hydrogels (>96%).

Related Experiment Videos

  • Fabrication of hydrogel discs (2.4 mm thickness) using BSA-PEG (MW 10000).
  • Investigation of release kinetics for theophylline (soluble) and lysozyme (protein) from the hydrogels.
  • Evaluation of hydrogel porosity by varying PEG molecular weight and assessing its impact on the diffusion of theophylline and hydrocortisone.

    • Main Results:

    • The BSA-PEG hydrogels demonstrated controlled release of both soluble and hydrophobic substances, including proteins.
    • Release followed a diffusion-controlled mechanism with half-life times ranging from 0.8 hours (theophylline) to 4.2 hours (lysozyme) for a 2.4 mm thick BSA-PEG (MW 10000) disc.
    • Higher molecular weight PEG resulted in more porous hydrogels, leading to faster diffusion rates for theophylline and hydrocortisone.

    Conclusions:

    • BSA-PEG hydrogels are effective and versatile platforms for the controlled release of diverse molecules.
    • Hydrogel porosity, controllable via PEG molecular weight, is a critical factor influencing diffusion-based release rates.
    • These findings highlight the potential of tailored BSA-PEG hydrogels for advanced drug delivery applications.