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FEMS Yeast Res. 2003 Mar;3(1):53-62.

Biotransformation of hop aroma terpenoids by ale and lager yeasts.

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Cardiff School of Biosciences, Cardiff University, PO Box 915, CF10 3TL, Cardiff, UK.


Terpenoids are important natural flavour compounds, which are introduced to beer via hopping. It has been shown recently that yeasts are able to biotransform some monoterpene alcohols. As a first step towards examining whether yeasts are capable of altering hop terpenoids during the brewing of beer, we investigated whether they were transformed when an ale and lager yeast were cultured in the presence of a commercially available syrup. Both yeasts transformed the monoterpene alcohols geraniol and linalool. The lager yeast also produced acetate esters of geraniol and citronellol. The major terpenoids of hop oil, however, were not biotransformed. Oxygenated terpenoids persisted much longer than the alkenes.

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