Studies on encapsulation of Rifampicin and its release from chitosan-dextran sulfate capsules

M. Geetha Devi*, Susmita Dutta, Ashraf Talib Al Hinai, S. Feroz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Biodegradable capsules of size around 350 nm were prepared by layer-by-layer (L-b-L) assembly of oppositely charged chitosan and dextran sulfate on silica particles and the subsequent removal of template. The resulting capsules were loaded with rifampicin, an anti-tuberculosis drug under modest conditions, as demonstrated by scanning electron microscopy (SEM). Maximum encapsulation of rifampicin was found to be about 82 μg at 25 °C and pH of 3. Release studies were done in-vitro mode by semiautomatic release protocol, with different pH solutions in water and phosphate buffered saline (PBS). The microcapsules exhibited a slow and sustained release over 72 hours and maximum release was obtained at a pH of 1.2 in water and a pH of 7.4 in PBS. The size of silica particle was analyzed by dynamic light scattering method. Scanning electron microscopy (SEM) measurements showed the surface morphology of the hollow capsules. UV spectroscopy was employed to monitor the drug release processes in both solutions. The kinetics of drug release mechanism was studied using Ritger-Peppas and Higuchi models.

Original languageEnglish
Pages (from-to)118-124
Number of pages7
JournalKorean Journal of Chemical Engineering
Issue number1
Publication statusPublished - Jan 2014


  • Biodegradable Capsules
  • Chitosan
  • Dextran Sulfate
  • Drug Release
  • Encapsulation
  • Microcapsules
  • Rifampicin

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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