Evaluation of available energy of several dietaryfiber materials based on the fermentability from breath hydrogenexcretion in healthy human subjects Sadako Nakamura and Tsuneyuki Oku
Graduate School of Human Health Science, Siebold University ofNagasaki
In order to evaluate the available energy ofdietary fiber materials, the fermentability was estimated frombreath hydrogen excretion for 8 h after ingestion of 5g of dietaryfiber materials in healthy human subjects. Fructo-oligosaccharide,of which available energy has been 2kcal/g, was used as a positivecontrol, because it is not digested and is completely fermented byintestinal microbes. The following results were obtained based onthe variable fermentability of each dietary fiber material.
1) Polydextrose, indigestible dextrin, partially hydrolyzed guargum, Iowered molecular alginate-Na and glucomannan were estimatedas 1 kcal/g.
2) Nondigestible starch, which was resistant for the fermentationby intestinal microbes, was estimated as 0kcal/g.
3) Cellulose, which is a water-insoluble dietary fiber, was slowlyfermented and was estimated as 1 kcal/g.
These results demonstrate that the method using breath hydrogenanalysis is available to estimate the fermentability of dietaryfiber in human gastrointestinal tract. However, it was not enoughto collect expiratory gas of every 30 min period for 8 h afteringestion of dietary fiber materials. The fermentation of eachdietary fiber material did not have been finished yet till 8 hafter ingestion. Therefore, if the breath is collected for longerperiods, the fermentability might increase and the available energywould be changed from the values as mention above. Another studywith longer periods of breath collection will be needed. Key words:available energy, dietary fiber, fermentability, breath hydrog |
Return
|
