Stability of hop beta acids and their decomposition products during natural ageing

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60193697%3A_____%2F13%3A%230000824" target="_blank" >RIV/60193697:_____/13:#0000824 - isvavai.cz</a>
Alternative codes found
RIV/14864347:_____/13:#0000506
Result on the web
<a href="http://www.actahort.org/members/showpdf?booknrarnr=1010_26" target="_blank" >http://www.actahort.org/members/showpdf?booknrarnr=1010_26</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Stability of hop beta acids and their decomposition products during natural ageing
Original language description
Instability and tendency to oxidation depending to conditions is a dominant property of hop beta acids. Mentioned property has an impact both on hop storage and beer brewing process. Approximately half amount decomposes at room temperature under open airconditions in the course of one month. After 6 months the rate of degradation is more than 90%. Dynamics of decomposition is much slower in leaf hops, primarily during first 6 months of storage. Beers hopped by partially oxidized beta acids showed perceptible sensorial bitterness. Bitterness was pleasant and not clinging. Changes of beta acids in the course of ageing explain that bittering potential of old hops does not declines proportionally to alpha acid loss. A large share of degradation products are formed by cyclization of prenyl side chains of beta acids as arises from mass spectra analysis (tricyclolupulones and hydroxytricyclolupulones). Comparison of decomposition products mass spectra emerging during natural ageing and labor
Czech name
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Czech description
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Project
<a href="/en/project/QI91B227" target="_blank" >QI91B227: Significance of hop beta acids for Czech beers</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proceedings of theThird International Humulus Symposium, Acta Horticulturae No. 1010
ISBN
978-90-6605-696-1
ISSN
0567-7572
e-ISSN
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Number of pages
10
Pages from-to
221-230
Publisher name
International Society for Horticultural Science
Place of publication
Belgium
Event location
Žatec,ČR
Event date
Jan 1, 2012
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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