Macroporous poly(sucrose acrylate) hydrogel for controlled release of macromolecules

Nitin S. Patil, Jonathan S. Dordick, David G. Rethwisch

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

We have studied the controlled release of proteins from poly(sucrose acrylate) hydrogels. The hydrogels were prepared by a two-step procedure in which sucrose was first acylated to sucrose-1'-acrylate followed by free radical polymerization. By adjusting the cross-link ratio and initial monomer concentration, the swelling ratio of the hydrogel was varied from five to 28. The mechanical strength of these hydrogels was comparable to that of other hydrogels with approximately the same swelling ratio. Scanning electron micrographs and mesh size calculations indicate that the hydrogel is macroporous, suggesting it may be suitable for a variety of biomedical applications. The release kinetics of β-lactoglobulin, bovine serum albumin and γ-globulin were studied as a function of initial monomer concentrations for the sucrose-based hydrogel. All of the release profiles were characterized by an initial burst of protein in the first 25 h followed by a long period of sustained release (> 500 h). The magnitude of the initial burst was reduced by increasing the initial monomer concentration and by increasing the molecular weight of the protein. A quantitative model based on the heterogeneous nature of the hydrogel was developed to explain the observed release kinetics.

Original languageEnglish
Pages (from-to)2343-2350
Number of pages8
JournalBiomaterials
Volume17
Issue number24
DOIs
StatePublished - Dec 1996
Externally publishedYes

Keywords

  • Controlled release
  • Drug delivery
  • Hydrogels
  • Poly(sucrose acrylate)
  • Protein delivery

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