pH-dependent release of insulin from layer-by-layer-deposited polyelectrolyte microcapsules

Kentaro Yoshida, Tetsuya Ono, Yoshitomo Kashiwagi, Shigehiro Takahashi, Katsuhiko Sato, Jun Ichi Anzai

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Insulin-containing microcapsules were prepared by a layer-by-layer (LbL) deposition of poly(allylamine hydrochloride) (PAH) and polyanions, such as poly(styrenesulfonate) (PSS), poly(vinyl sulfate) (PVS), and dextran sulfate (DS) on insulin-containing calcium carbonate (CaCO3) microparticles. The CaCO3 core was dissolved in diluted HCl solution to obtain insulin-containing hollow microcapsules. The microcapsules were characterized by scanning electron microscope (SEM) and atomic force microscope (AFM) images and ζ-potential. The release of insulin from the microcapsules was faster at pH 9.0 and 7.4 than in acidic solutions due to the different charge density of PAH. In addition, insulin release was suppressed when the microcapsules were constructed using PAH with a lower molecular weight, probably owing to a thicker shell of the microcapsules. The results suggested a potential use of the insulin-containing microcapsules for developing insulin delivery systems.

Original languageEnglish
Pages (from-to)1269-1278
Number of pages10
Issue number7
Publication statusPublished - 2015


  • Controlled release
  • Drug delivery
  • Insulin
  • Layer-by-layer film
  • Polyelectrolyte microcapsule

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics


Dive into the research topics of 'pH-dependent release of insulin from layer-by-layer-deposited polyelectrolyte microcapsules'. Together they form a unique fingerprint.

Cite this