Fabrication of a pure porous chitosan bead matrix: Influences of phase separation on the microstructure

Il Juhn Roh, Ick Chan Kwon

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The material properties and the microstructure of the scaffold are important parameters that determine the suitability of a material for tissue growth and controlled drug release. Because of its non-toxic, biocompatible, biodegradable, and antithrombogenic nature, chitosan has generated enormous interest for such applications. Chitosan bead-type scaffolds having various microstructures without any other material introduction were fabricated. For fabricating pure chitosan beads, a modified wet process and an extended thermally induced phase separation (TIPS) process were adapted. In the modified wet process, an acidic chitosan solution was phase-separated by changing its pH using an NaOH solution. The microstructure of the chitosan beads became looser with a decrease in the initial chitosan concentration, an increase in the acetic acid concentration, as well as with the addition of PEG to the dope solution. In contrast, the microstructure densified with an increase in the NaOH concentration in the coagulation bath. Through the modified wet process, porous chitosan beads with a relatively small pore size (0.01-13 μm) and moderate porosity (33-71%) could be prepared. In the extended TIPS process, chitosan solutions cast at different temperatures below 0°C resulted in different microstructures wherein the microstructure densified with an increase in the quenching rate. The chitosan beads fabricated via extended TIPS had large pore sizes (26-120 μm) and high porosity (85-92%). All of these matrices showed good interconnected pores.

Original languageEnglish
Pages (from-to)769-782
Number of pages14
JournalJournal of Biomaterials Science, Polymer Edition
Volume13
Issue number7
DOIs
Publication statusPublished - 2002

Keywords

  • Extended thermally induced phase separation process
  • Fabrication methods
  • Modified wet process
  • Porous chitosan bead

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering

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