Regioselective succinylation and gelation behavior of glycol chitosan

Keunsoo Jeong, Wonbum Lee, Jueun Cha, Chong Rae Park, Yong Woo Cho, Ick Chan Kwon

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Chitosan is normally acylated and subsequently conjugated with drugs for biomedical applications. This study examined the relationship between the succinylation and gelation behaviors of glycol chitosan. Glycol chitosan was acylated with succinic anhydride under a wide variety of reaction conditions, such as different molar ratios of succinic anhydride to glucosamine, different methanol content in the reaction media, and different reaction temperatures. Among these reaction parameters, the methanol content in the solvent played an important role in determining the regioseletive succinylating site. N-succinylation and N-N cross-linking occurred regardless of the reaction conditions. However, O-succinylation was observed under specific conditions, i.e. a methanol content > 0.6 (v/v) and a reaction temperature > 25 °C. O-succinylation accelerated the N-O cross-linking of glycol chitosan, and led to gelation. The N-succinylated glycol chitosans were water-soluble, whereas the N- and O-succinylated glycol chitosans formed a gel. These physico-chemical structural differences in the succinylated glycol chitosans would definitely influence subsequent drug-conjugation reactions and consequently the drug loading and release kinetics.

Original languageEnglish
Pages (from-to)57-61
Number of pages5
JournalMacromolecular Research
Issue number1
Publication statusPublished - 2008 Jan


  • Biopolymers
  • Chitosan
  • Gelation
  • Regioselectivity
  • Succinylation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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