Lactobacillus Research Today is a free monthly online journal that collates and summarizes the latest research about Lactobacillus, including details on probiotics, digestion, diet, health, lactobacillus acidophilus.

Generation of aroma compounds in sourdough: effects of stress exposure and lactobacilli-yeasts interactions.

Guerzoni ME, Vernocchi P, Ndagijimana M, Gianotti A, Lanciotti R

Dipartimento di Scienze degli Alimenti, Alma Mater Studiorum, University of Bologna, Via Fanin, 46, 40127 Bologna, Italy. guerzoni@foodsci.unibo.it

The effects of the interaction between Saccharomyces cerevisiae LBS and Lactobacillus sanfranciscensis LSCE1 and of their responses to acid, oxidative or osmotic stress on alcohol and aroma production were assessed. The exposure of S. cerevisiae LBS and L. sanfranciscensis LSCE1 cells to oxidative, acid or osmotic sub-lethal stress gave rise to a common or specific responses. Gamma-decalactone, 2(5H)-furanones and aldehydes were overproduced by LAB following oxidative stress. The acid stress induced both in yeasts and LAB, as well as in their co-cultures, a relevant accumulation of isovaleric and acetic acids and higher alcohols. A cross-exposure of yeasts and LAB to their preconditioned media, generated in S. cerevisiae a release of esters including esters of long-chain unsaturated fatty acids coming from membrane phospholipids. These esters were excreted also by yeasts following a pressure stress.

Published 29 September 2006 in Food Microbiol, 24(2): 139-48.
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