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In vitro fermentation of lactulose-derived oligosaccharides by mixed fecal microbiota

By Alejandra Cardelle-Cobas, Agustín Olano, Nieves Corzo, Mar Villamiel, Michelle Collins, Sofia Kolida and Bob Rastall

Abstract

Fermentation properties of oligosaccharides derived from lactulose (OsLu) and lactose (GOS) have been assessed in pH-controlled anaerobic batch cultures using lactulose and Vivinal-GOS as reference carbohydrates. Changes in gut bacterial populations and their metabolic activities were monitored over 24 h by fluorescent in situ hybridization (FISH) and by measurement of short-chain fatty acid (SCFA) production. Lactulose-derived oligosaccharides were selectively fermented by Bifidobacterium and lactic acid bacterial populations producing higher SCFA concentrations compared to GOS. The highest total SCFA production was from Vivinal-GOS > lactulose > OsLu > GOS. Longer incubation periods produced a selective fermentation of OsLu when they were used as a carbon source reaching the highest selective index scores. The new oligosaccharides may constitute a good alternative to lactulose, and they could belong to a new generation of prebiotics to be used as a functional ingredient for improving the composition of gut microflora

Publisher: American Chemical Society
Year: 2012
DOI identifier: 10.1021/jf203622d
OAI identifier: oai:centaur.reading.ac.uk:26945
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