Persistence and β-glucan formation of beer-spoiling lactic acid bacteria in wheat and rye sourdoughs.

Food Microbiology
Julia A BockwoldtFrank Jakob

Abstract

Some beverage-spoiling lactic acid bacteria (LAB) produce capsular β-glucans from UDP-glucose, which is accompanied by cell network formation causing viscosity increases of liquids. This feature of certain LAB is feared in breweries but could be useful for structural and nutritional improvement of baked goods, provided that these LAB are suited for the manufacture of sourdoughs. The aim of this study was to investigate the persistence and β-glucan formation of the brewery isolates Levilactobacillus (L.) brevis TMW 1.2112 and Pediococcus (P.) claussenii TMW 2.340 in wheat and rye sourdoughs. Both the wild-type strains and the respective β-glucan-deficient mutants were dominant in wheat and rye sourdoughs and acidified them to characteristic pH ranges. The formation of β-glucan capsules during sourdough fermentations was stable in L. brevis TMW 1.2112 in contrast to P. claussenii TMW 2.340. Wheat sourdoughs fermented with the β-glucan producing L. brevis TMW 1.2112 cells were significantly more viscous than doughs fermented by the P. claussenii TMW 2.340 cells and the applied mutant strains. In conclusion, L. brevis TMW 1.2112 and P. claussenii TMW 2.340 were suited and persistent wheat and rye sourdough starters, while the in si...Continue Reading

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