Journal
CARBOHYDRATE POLYMERS
Volume 237, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116117
Keywords
Konjac glucomannan; Enzyme hydrolysis; Molecular weight; Viscosity; Short chain fatty acids
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Funding
- National Key R&D Program of China [2017YFD0400104]
- National High-tech R&D Program of China [2013AA102102]
- Postdoctoral Science Foundation of Jiangxi Province [2017KY03]
- Hong Kong Scholars Program [XJ2016058]
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Konjac glucomannan (KGM) with a molecular weight (MW) of 823.4 kDa was partially degraded by endo-1,4-beta-mannanase. Two hydrolyzed KGM fractions (KGM-M-1: 147.2 kDa and KGM-M-2: 21.5 kDa) were characterized and applied to the animal tests in comparison with the native KGM. After oral feeding to the mice, KGM-M-1 and KGM-M-2 significantly increased the levels of short chain fatty acids (SCFAs) in the colonic contents and the native KGM increased the SCFAs in the cecum. The more significant effect of the native KGM in the cecum may be attributable to its high viscosity, slowing down the movement of intestinal microflora through the cecum, while the lower MW KGM-M-1 and KGM-M-2 could move more easily through the colon to be fermented by colonic bacteria. This new finding may be useful for future research and development of low-MW KGM polysaccharides through enzyme hydrolysis for the desired gut health benefits.
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