Effect of ultrasonic treatments on nanoparticle preparation of acid-hydrolyzed waxy maize starch

Hee Young Kim, Jung Ah Han, Dong Keon Kweon, Jong Dae Park, Seung Taik Lim

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

Waxy maize starch was dispersed (14.7% solids) in an aqueous sulfuric acid solution (3.16 M), and hydrolyzed by stirring for up to 7 days at 40°C with ultrasonic treatments at different vibration amplitudes (20 and 40%) and durations (30 and 60 min/day). The amount of starch nanoparticles in the hydrolyzates isolated after 7 days, measured by a dynamic light scattering detector, was raised from 20% to 70% by an ultrasonic treatment (20% amplitude, 30 min). The aggregation of nanoparticles possibly occurring during the hydrolysis was effectively prevented by the ultrasonication. Alternatively, ultrasonic treatments were applied to the re-dispersed suspension of the large microparticles of starch hydrolyzates (2 days) precipitated by a mild centrifugation (500 rpm, 10 min). By an ultrasonic treatment at 60% vibration amplitude for 3 min, the microparticles could be completely transformed to nanoparticles. The inherent crystalline structure of waxy maize starch (A-type in X-ray diffraction) remained after the ultrasonic treatments during acid hydrolysis, but it was disrupted by the ultrasonic treatments for the re-dispersed microparticles.

Original languageEnglish
Pages (from-to)582-588
Number of pages7
JournalCarbohydrate Polymers
Volume93
Issue number2
DOIs
Publication statusPublished - 2013 Apr 2

Keywords

  • Acid hydrolysis
  • Nanoparticles
  • Starch
  • Ultrasonication

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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