Effect of polysaccharide chain conformation on ultrasonic degradation of curdlan in alkaline solution

Yi Ching Cheung, Junyi Yin, Jian Yong Wu (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)

Abstract

This study was to investigate the effects of polysaccharide chain conformation on ultrasonic degradation of curdlan, a high MW β-glucan with wide applications. The ultrasonic degradation was performed in alkaline solution at 0.1 M and 0.3 M NaOH, in which the curdlan chain was mainly in triple helical conformation and random coil form, respectively. The degradation rate was represented by the kinetic model, 1/Mt − 1/Mo = kt, with the rate constant k increasing with the ultrasonic power. The degradation rate was much higher in 0.3 M NaOH than in 0.1 M NaOH, suggesting that curdlan in random coil conformation was more liable to degradation than in helical conformation. Curdlan in 0.1 M NaOH was changed from triple helices to single helices and eventually to random coils with a higher solubility. In summary, ultrasonic degradation of curdlan in alkaline solution had a close and complex relationship to the chain conformation changes.

Original languageEnglish
Pages (from-to)298-302
Number of pages5
JournalCarbohydrate Polymers
Volume195
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Chain conformation
  • Curdlan
  • Intrinsic viscosity
  • Kinetics
  • Molecular weight
  • Ultrasonic degradation

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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