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Related Experiment Videos

A controlled release system for proteins based on poly(ether ester) block-copolymers: polymer network

J M Bezemer1, D W Grijpma, P J Dijkstra

  • 1Institute for Biomedical Technology (BMTI), Polymer Chemistry and Biomaterials, Faculty of Chemical Engineering, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|October 21, 1999
PubMed
Summary
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This study explores poly(ethylene glycol)/poly(butylene terephthalate) (PEG/PBT) copolymers for protein delivery. Higher PEG content enhances swelling and degradation, indicating tunable properties for controlled release applications.

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery Systems

Background:

  • Multiblock copolymers combining hydrophilic poly(ethylene glycol) (PEG) and hydrophobic poly(butylene terephthalate) (PBT) are promising for biomedical applications.
  • Understanding their swelling, mesh size, and degradation is crucial for controlled release matrix development.

Purpose of the Study:

  • To investigate the properties of PEG/PBT copolymers for controlled protein release.
  • To correlate copolymer composition and molecular weight with swelling behavior and mesh size.
  • To evaluate the in vitro degradation profiles of these copolymers.

Main Methods:

  • Synthesis and characterization of PEG/PBT multiblock copolymers.
  • Measurement of swelling degree (Q) and equilibrium stress-strain to determine mesh sizes.

Related Experiment Videos

  • Experimental validation of mesh sizes using diffusion of model molecules (vitamin B12, lysozyme, BSA).
  • In vitro degradation studies in phosphate-buffered saline at 37°C.

    • Main Results:

    • Swelling (Q) increased with higher PEG content and molecular weight, ranging from 1.26 to 3.64.
    • Copolymer mesh sizes ranged from 38 to 93 Å, confirmed by diffusion experiments.
    • Faster weight loss during degradation was observed for matrices with higher PEG content.
    • Molecular weight (M(n)) decreased by 35-45% over 54 days, with stable composition.

    Conclusions:

    • PEG/PBT copolymers exhibit tunable swelling and degradation properties based on PEG content and molecular weight.
    • The determined mesh sizes are suitable for the diffusion of proteins like lysozyme and BSA.
    • These copolymers demonstrate potential as matrices for controlled protein release, with degradation rates influenced by PEG content.