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Dose-dependent prebiotic effect of lactulose in a computer-controlled in vitro model of the human large intestine

Author: Bothe, M.K. · Maathuis, A.J.H. · Bellmann, S. · Vossen, J.M.B.M. van der · Berressem, D. · Koehler, A. · Schwejda-Guettes, S. · Gaigg, B. · Kuchinka-Koch, A. · Stover, J.F.
Type:article
Date:2017
Source:Nutrients, 7, 9
Identifier: 777386
doi: doi:10.3390/nu9070767
Article number: 767
Keywords: Biology · Ammonia · Anaerostipes · Bifidobacteria · Butyrate · Lactobacilli · Lactulose · Microbial fermentation · Biomedical Innovation · Healthy Living · Life Triskelion BV · MSB - Microbiology and Systems Biology ADME - ADME/DMPK · EELS - Earth, Environmental and Life Sciences TNO Bedrijven

Abstract

Lactulose, a disaccharide of galactose and fructose, used as a laxative or ammonia-lowering drug and as a functional food ingredient, enhances growth of Bifidobacterium and Lactobacillus at clinically relevant dosages. The prebiotic effect of subclinical dosages of Lactulose, however, remains to be elucidated. This study analyses changes in the microbiota and their metabolites after a 5 days Lactulose treatment using the TIM-2 system, a computer-controlled model of the proximal large intestine representing a complex, high density, metabolically active, anaerobic microbiota of human origin. Subclinical dosages of 2-5 g Lactulose were used. While 2 g Lactulose already increased the short-chain fatty acid levels of the intestinal content, 5 g Lactulose were required daily for 5 days in this study to exert the full beneficial prebiotic effect consisting of higher bacterial counts of Bifidobacterium, Lactobacillus, and Anaerostipes, a rise in acetate, butyrate and lactate, as well as a decrease in branched-chain fatty acids, pH (suggested by an increase in NaOH usage), and ammonia. © 2017 by the authors. Licensee MDPI, Basel, Switzerland.