Send to

Choose Destination
J Nutr Sci Vitaminol (Tokyo). 1998 Jun;44(3):423-36.

Degradation of konjac glucomannan by enzymes in human feces and formation of short-chain fatty acids by intestinal anaerobic bacteria.

Author information

Department of Nutritionl Science, Faculty of Health and Welfare Science, Okayama Prefectural University, Soja, Japan.


Konjac (konnyaku) glucomannan was examined for its degradation in human intestines and fermentation products. The konjac glucomannan was degraded almost 100% by soluble enzymes in human feces to give 4-O-beta-D-mannopyranosyl-D-mannopyranose (beta-1,4-D-mannobiose), 4-O-beta-D-glucopyranosyl-D-glucopyranose (cellobiose), 4-O-beta-D-glucopyranosyl-D-mannopyranose, and small amounts of glucose and mannose. These three disaccharides were further degraded by a cell-associated enzyme(s) to glucose or mannose, or to both. Konjac glucomannan underwent fermentation by intestinal anaerobic bacteria and produced formic acid, acetic acid, propionic acid, and 1-butyric acid. These fatty acids were different in their proportions among test subjects, their total amounts ranging from 17.1% to 48.8% of the initial konjac glucomannan.

[Indexed for MEDLINE]

Supplemental Content

Loading ...
Support Center