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Increasing popularity of sour beer urges the development of novel solutions for controlled fermentations both for fast acidification and consistency in product flavor and quality. One possible approach is the use of  Saccharomyces cerevisiae  in co-fermentation with  Lactobacillus  species, which produce lactic acid as a major end-product of carbohydrate catabolism. The ability of lactobacilli to ferment beer is determined by their capacity to sustain brewing-related stresses, including hop iso-α acids, low pH and ethanol. Here, we evaluated the tolerance of  Lactobacillus brevis  BSO464 and  Lactobacillus buchneri  CD034 to beer conditions and different fermentation strategies as well as their use in the brewing process in mixed fermentation with a brewer’s yeast,  S. cerevisiae  US-05. Results were compared with those obtained with a commercial  Lactobacillus plantarum  (WildBrew TM  Sour Pitch), a strain commonly used for kettle souring. In pure cultures, the three strains showed varying susceptibility to stresses, with  L. brevis  being the most resistant and  L. plantarum  displaying the lowest stress tolerance. When in co-fermentation with  S. cerevisiae , both  L. plantarum  and  L. brevis  were able to generate sour beer in as little as 21 days, and their presence positively influenced the composition of flavor-active compounds. Both sour beers were sensorially different from each other and from a reference beer fermented by  S. cerevisiae  alone. While the beer produced with  L. plantarum  had an increased intensity in fruity odor and dried fruit odor, the  L. brevis  beer had a higher total flavor intensity, acidic taste and astringency. Remarkably, the beer generated with  L. brevis  was perceived as comparable to a commercial sour beer in multiple sensory attributes. Taken together, this study demonstrates the feasibility of using  L. brevis  BSO464 and  L. plantarum  in co-fermentation with  S. cerevisiae  for controlled sour beer production with shortened production time.

frontiers in microbiology

Co-fermentation Involving Saccharomyces cerevisiae and Lactobacillus Species Tolerant to Brewing-Related Stress Factors for Controlled and Rapid Production of Sour Beer