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Development of chitosan–tripolyphosphate fibers through pH dependent ionotropic gelation

Authors
Journal
Carbohydrate Research
0008-6215
Publisher
Elsevier
Publication Date
Volume
346
Issue
16
Identifiers
DOI: 10.1016/j.carres.2011.08.028
Keywords
  • Chitosan–Tripolyphosphate Fiber
  • Ionotropic Gelation
  • Degree Of Cross-Linking
  • Phosphate Content
  • Crystallinity
Disciplines
  • Biology
  • Chemistry

Abstract

Abstract Incorporation of phosphate groups into a material may be of particular interest as they act as templates for hydroxyapatite growth through complexation with Ca 2+ and thus improve the osteoconduction property. The phosphate groups can be incorporated into chitosan through ionotropic gelation with tripolyphosphate (TPP). Interestingly, the ion pairs formed through negatively charged phosphate groups with protonated amine functionality of chitosan in ionotropic gelation are expected to provide chitosan with an amphoteric character, which may facilitate protein adhesion following enhanced attachment of anchorage dependant cells than chitosan, which shows poor cell adhesion properties. In this study, chitosan–tripolyphosphate (TPP) fibers with varying phosphate contents were prepared through wet spinning in STPP baths of different pH. Gelation kinetics and gel strength of chitosan with STPP solutions of three different pH were evaluated and compared with that of NaOH solution for evaluation of their influence on nature of gelation. The solution pH of STPP baths was found to have significant control on the extent of ionic cross-linking and physico-chemical properties of the fibers. Moreover, this kinetically driven ionotropic gelation of chitosan by TPP results in low degree of crystallinity of chitosan–TPP fibers and consequently their lower thermal stability than chitosan fibers.

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