Identification of a stale-beer-like odorant in extracts of naturally aged beer.
For a long time, beer staling has been a prime concern in brewery research. Yet, to improve flavor stability, better knowledge of all chemicals involved is still needed. From our aroma extract dilu-tion analyses (AEDA) applied to naturally aged lager beers emerged an old-beer-like odorant at RICP-SIL 5 CB = 1532 and RIFFAP = 2809, with a FD value close to that of trans-2-nonenal (the well-known cardboard off-flavor found in aged beers). Specific phenol extraction, GC cold trapping, and mass spectrometry (electron impact and chemical ionization) enabled us to identify it as 4-vinylsyringol. Although already mentioned in some fresh beers, this compound had never been highlighted as involved in the aging process of lager beers.
Callemien
Delphine
D
Unité de Brasserie et des Industries Alimentaires, Université catholique de Louvain, Croix du Sud, 2/bte 7, B-1348 Louvain-la-Neuve, Belgium.
Dasnoy
Sébastien
S
Collin
Sonia
S
D001515:Beer / Q000032:analysis*; D002849:Chromatography, Gas; D008401:Gas Chromatography-Mass Spectrometry; D009812:Odorants / Q000032:analysis*; D011748:Pyrogallol / Q000031:analogs & derivatives* / Q000032:analysis; D013649:Taste; D013997:Time Factors
C509202:4-vinylsyringol; D011748:Pyrogallol