Simultaneous deacetylation and degradation of chitin hydrogel by electrical discharge plasma using low sodium hydroxide concentrations

Ratana Rujiravanit, Maneekarn Kantakanun, Chayanaphat Chokradjaroen, Chutima Vanichvattanadecha, Nagahiro Saito

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electrical discharge plasma occurring in a liquid phase, so called solution plasma, can generate highly active species, e.g. free radicals, which can involve in various chemical reactions, leading to less chemical uses. In this study, solution plasma was applied to deacetylation of chitin aiming to reduce the use of alkali. It was found that solution plasma could induce deacetylation of chitin hydrogels that were dispersed in MeOH/water solutions containing low NaOH concentrations (1–12%). Due to the action of free radicals, some extent of chain session of the polymer occurred during the plasma treatment. The degree of deacetylation and molecular weight of the obtained chitosan were 78% and 220 kDa, respectively, after the plasma treatment for five cycles (1 h/cycle) by using 90% MeOH/water solution containing 12% NaOH. The obtained chitosan could completely dissolve in 2% acetic acid solution and had antibacterial activities against S. aureus and E. coli.

Original languageEnglish
Article number115377
JournalCarbohydrate Polymers
Volume228
DOIs
Publication statusPublished - 2020 Jan 15
Externally publishedYes

Keywords

  • Chitin hydrogel
  • Chitosan
  • Deacetylation
  • Electrical discharge plasma

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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