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Related Experiment Video

Updated: Jul 11, 2026

A Freeze-Thawing Method to Prepare Chitosan-Poly(vinyl alcohol) Hydrogels Without Crosslinking Agents and Diflunisal Release Studies
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Modifying the release of proxyphylline from PVA hydrogels using surface crosslinking.

Linfeng Wu1, Christopher S Brazel

  • 1Department of Chemical and Biological Engineering, Box 870203, 201 7th Avenue, The University of Alabama, Tuscaloosa, AL 35487, USA.

International Journal of Pharmaceutics
|September 19, 2007
PubMed
Summary

Surface crosslinking poly(vinyl alcohol) (PVA) hydrogels controls drug release. This method prevents initial burst release and achieves reproducible delayed drug delivery by managing layer thickness and crosslinking density.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomedical Engineering

Background:

  • Poly(vinyl alcohol) (PVA) hydrogels are widely used in drug delivery.
  • Controlling drug release profiles, particularly preventing initial burst release, is crucial for effective hydrogel-based therapeutics.
  • Surface modification techniques offer a promising approach to tailor hydrogel properties.

Purpose of the Study:

  • To investigate the creation of surface crosslinked layers in PVA hydrogels.
  • To evaluate the impact of surface crosslinking on drug release profiles, specifically aiming to eliminate burst release and introduce delayed release.
  • To understand the relationship between surface crosslinking parameters and hydrogel properties.

Main Methods:

  • Fabrication of PVA hydrogels.
  • Surface crosslinking using glutaraldehyde (GTA) with varying exposure times and concentrations.
  • Confocal laser scanning microscopy (CLSM) for characterizing surface layers.
  • In vitro drug release studies using proxyphylline as a model drug.

Main Results:

  • Successful formation of surface crosslinked layers on PVA hydrogels confirmed by CLSM.
  • Surface layer thickness and crosslinking density were dependent on GTA concentration and exposure time.
  • Elimination of initial burst release and achievement of reproducible delayed drug release were observed.
  • Hydrogel swelling led to layer rupture, which coincided with the delayed release of proxyphylline.

Conclusions:

  • Surface crosslinking is an effective strategy to control drug release from PVA hydrogels.
  • Tunable surface crosslinking parameters allow for the prevention of burst release and the induction of delayed drug delivery.
  • The findings provide a foundation for designing advanced PVA hydrogel systems for controlled drug delivery applications.