Diversity of microbial communities in open mixed culture fermentations: impact of the pH and carbon source.

ABSTRACT: Anaerobic fermentation by an open mixed culture was investigated at different pH values (4-8.5) and with three substrates (glucose, glycerol and xylose). The populations established in each condition were assessed by denaturing gradient gel electrophoresis analysis of the 16S ribosomal RNA gene fragments. The fermentation pattern and the composition of the microbial population were also evaluated when operational variations were imposed (increase of substrate concentration or introduction of a second substrate). The experimental results demonstrated that at low and high pH values, a clearly different fermentation pattern was associated with the dominance of a specialised group of clostridiae. At intermediate pH values, the product spectrum was rather variable and seemed to be sensitive to

SUBMITTER: Temudo MF 

PROVIDER: S-EPMC7419374 | biostudies-literature | 2008 Oct

REPOSITORIES: biostudies-literature