Effects of Ultrasonication on the Conformational, Microstructural, and Antioxidant Properties of Konjac Glucomannan

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 molecu...

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Bibliographic Details
Published in:Applied sciences 2019-01, Vol.9 (3), p.461
Main Authors: Yin, Jun-Yi, Ma, Lu-Yao, Siu, Ka-Chai, Wu, Jian-Yong
Format: Article
Language:English
Subjects:
antioxidant activity
Antioxidants
Conformation
Degradation
Food
Fourier transforms
konjac glucomannan
Methods
Microprocessors
Microstructure
Molecular conformation
Molecular weight
Polymers
Rheology
Scavenging
Temperature effects
Ultrasonic imaging
ultrasonic treatment
Viscosity
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9030461