Assessment of changes in hop resins and polyphenols during long-term storage

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60193697%3A_____%2F12%3A%230000711" target="_blank" >RIV/60193697:_____/12:#0000711 - isvavai.cz</a>

Result on the web

<a href="http://onlinelibrary.wiley.com/doi/10.1002/jib.40/abstract" target="_blank" >http://onlinelibrary.wiley.com/doi/10.1002/jib.40/abstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/jib.40" target="_blank" >10.1002/jib.40</a>

Result language

angličtina

Original language name

Assessment of changes in hop resins and polyphenols during long-term storage

Original language description

Changes in the content and composition of hop secondary metabolites during storage are reflected in beer quality and in the economics of beer production. A 12-month storage experiment with T90 pellets of four hop varieties showed different dynamics of hop aging in relation to both storage conditions and hop variety. Negligible effects on the ?- and ?-acids were detected during storage without air access at +2°C. Storage at +20°C resulted in a final loss of 20?25% ?-acids, but the content of ?-acids didnot change significantly. Large decreases in ?-acids (64?88%) and in ?-acids (51?83%) were found in hops stored with access to air at +20°C. The rate of decline accelerated markedly after 6 months of storage. In terms of hop resin changes, Premiant and Sládek were the most and the least stable varieties, respectively. After 12 months, the content of the total polyphenols and flavonoids decreased by 30?40% and by 20?30%, respectively, irrespective of storage conditions. The rate of declin

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

GM - Food industry

OECD FORD branch

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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

2012

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of the Institute of Brewing

ISSN

0046-9750

e-ISSN

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Volume of the periodical

118

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

269-279

UT code for WoS article

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EID of the result in the Scopus database

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