Lectin-functionalized carboxymethylated kappa-carrageenan microparticles for oral insulin delivery

Kok Hoong Leong, Lip Yong Chung, Mohamed Ibrahim Noordin, Yoshinori Onuki, Mariko Morishita, Kozo Takayama

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


We hypothesized that pH-responsive carboxymethylated kappa-carrageenan microparticles could protect entrapped oral insulin from acidic and proteolytic degradation in the gastrointestinal tract. Therefore, the objectives of this study were to prepare and characterize insulin entrapped in lectin- functionalized carboxymethylated kappa-carrageenan microparticles and to evaluate their therapeutic efficacy in vitro and in vivo. The encapsulation of insulin was performed using an ionic gelation technique and was optimized to give an encapsulation efficiency of 94.2 ± 2.6% and a drug-loading capacity of 13.5 ± 0.4%. The microparticles were further surface-lectin-functionalized for improved intestinal mucoadhesiveness. The oral administration of insulin entrapped in the microparticles led to a prolonged duration of the hypoglycemic effect, up to 12-24 h, in diabetic rats. From the release profile and the low toxicity of the microparticles, it can be concluded that these lectin-functionalized carboxymethylated kappa-carrageenan microparticles have the potential to be developed into an oral insulin delivery system.

Original languageEnglish
Pages (from-to)555-565
Number of pages11
JournalCarbohydrate Polymers
Issue number2
Publication statusPublished - Aug 15 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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