Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80668
Title: Effects of ultrasonication on the conformational, microstructural, and antioxidant properties of konjac glucomannan
Authors: Yin, JY 
Ma, LY
Siu, KC 
Wu, JY 
Keywords: Antioxidant activity
Conformation
Konjac glucomannan
Microstructure
Ultrasonic treatment
Issue Date: 2019
Publisher: Molecular Diversity Preservation International (MDPI)
Source: Applied sciences, 2019, v. 9, no. 3, 461 How to cite?
Journal: Applied sciences 
Abstract: This study aims to evaluate the effects of ultrasonication (US) on the conformational, microstructural, and antioxidant properties of konjac glucomannan (KGM). US treatment with a 20-kHz and 750-W ultrasonic processor at 60% amplitude was applied for partial degradation of KGM with an average molecular weight (MW) of 823.4 kDa. Results indicated that the US treatment caused dramatic reduction in the MW, apparent viscosity, hydrodynamic radius, and z-average mean radius of gyration. The flexibility of chain conformation of native KGM was slightly increased during the US treatment. According to electronic microscopic imaging, the compact, smooth, and orderly fibrous strings formed by KGM were changed to amorphous, porous flakes and globular particles after US treatment. KGM and its US-treated fractions showed moderate radical-scavenging and ferric-reducing antioxidant activity. US degradation of KGM affected these activities either positively or negatively, depending on the US treatment period. In summary, ultrasonic degradation of KGM caused changes in its conformation characteristics, microstructure, and antioxidant activities.
URI: http://hdl.handle.net/10397/80668
ISSN: 2076-3417
DOI: 10.3390/app9030461
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