LIBERATION OF STALING ALDEHYDES DURING STORAGE OF BEER
Open Access
- 12 November 1983
- journal article
- research article
- Published by Chartered Institute of Brewers and Distillers in Journal of the Institute of Brewing
- Vol. 89 (6) , 411-415
- https://doi.org/10.1002/j.2050-0416.1983.tb04216.x
Abstract
Trans-2-nonenal, 3-hydroxynonanal and 3-hydroxybutanal were isolated from barley and wort and mass spectral evidence for the presence of further hydroxyaldehydes was found. The concentration of free aldehydes in a model solution was found to decrease in the presence of bisulphite. Addition of acetaldehyde to a mixture of aldehyde bisulphite complexes released trans-2-nonenal in preference to other aldehydes. The concentration of sulphite in beer decreased by 66% over four months. This data was combined in a theory in which the papery, cardboard stage of beer staling is ascribed to a decrease in bisulphite concentration and subsequent bisulphite transfer from unsaturated aldehyde bisulphite addition complexes.Keywords
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