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Preventing Spoilage in Beer Fermentations

Bacterial infections during beer fermentations give rise to off-flavours. To redress this yeast strains have been constructed which have been shown to prevent bacterial spoilage of beer fermentations. This process have been patented by Ursula Bond et al. (United States Patent Application No.0120308538, Preventing Spoilage in AlcoholFermentations). 

 

beerSpoilage

Yeast expressing antimicrobial peptides provide protection against bacterial infection of beer fermentations. Bacterial growth in fermentations with (black) and without (grey). More information may be found in

T.C. James et al; In situ production of human b defensin-3 in lager yeasts provides bactericidal activity against beer-spoiling bacteria under fermentation conditions. Journal of Applied Microbiology (2014), doi:10.1111/jam.12382.