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Statements

Subject Item
n2:RIV%2F14864347%3A_____%2F10%3A%230000308%21RIV11-MSM-14864347
rdf:type
n10:Vysledek skos:Concept
dcterms:description
Content of isoxanthohumol (IX) in most of Czech and foreign beer brands did not exceed limit of 2000 mg.l-1. Concentration of xanthohumol (XN) was up to 100 mg.l-1. The most of prenylflavonoids out of all investigated beers were found in Czech dark 12 % lager - 2500 mg.l-1 IX a 500 mg.l-1 XN. In average less prenylflavonoids were found in draught and alcohol-free beer brands due to lower hopping rate and higher proportion of CO2-extracts. Level of IX in beer can be influenced by choice of hop veriety with higher XN/alpha acid ratio. The most of prenylflavonoids is inserted into brewing process if vatieties Sládek and Saaz are used for hopping. Total rate of xanthohumol utilisation during beer production in full-scale is approximately 20-30 %. Tracing of the stability of IX and XN contents in bottled beers which was done in the time period of 3 months showed, that concentration of isoxanthohumol is reduced by 10-15 % based on storage temperature. Content of isoxanthohumol (IX) in most of Czech and foreign beer brands did not exceed limit of 2000 mg.l-1. Concentration of xanthohumol (XN) was up to 100 mg.l-1. The most of prenylflavonoids out of all investigated beers were found in Czech dark 12 % lager - 2500 mg.l-1 IX a 500 mg.l-1 XN. In average less prenylflavonoids were found in draught and alcohol-free beer brands due to lower hopping rate and higher proportion of CO2-extracts. Level of IX in beer can be influenced by choice of hop veriety with higher XN/alpha acid ratio. The most of prenylflavonoids is inserted into brewing process if vatieties Sládek and Saaz are used for hopping. Total rate of xanthohumol utilisation during beer production in full-scale is approximately 20-30 %. Tracing of the stability of IX and XN contents in bottled beers which was done in the time period of 3 months showed, that concentration of isoxanthohumol is reduced by 10-15 % based on storage temperature.
dcterms:title
The content of hop prenylflavonoids in Czech and foreign beers The content of hop prenylflavonoids in Czech and foreign beers
skos:prefLabel
The content of hop prenylflavonoids in Czech and foreign beers The content of hop prenylflavonoids in Czech and foreign beers
skos:notation
RIV/14864347:_____/10:#0000308!RIV11-MSM-14864347
n3:aktivita
n16:Z
n3:aktivity
Z(MSM1486434701)
n3:cisloPeriodika
1
n3:dodaniDat
n12:2011
n3:domaciTvurceVysledku
n15:9814299
n3:druhVysledku
n11:J
n3:duvernostUdaju
n7:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
251952
n3:idVysledku
RIV/14864347:_____/10:#0000308
n3:jazykVysledku
n4:eng
n3:klicovaSlova
hops and beer; xanthohumol and isoxanthohumol; liquid chromatography
n3:klicoveSlovo
n9:hops%20and%20beer n9:liquid%20chromatography n9:xanthohumol%20and%20isoxanthohumol
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[61E4B801AFAE]
n3:nazevZdroje
Kvasný průmysl
n3:obor
n17:CB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
1
n3:rokUplatneniVysledku
n12:2010
n3:svazekPeriodika
56
n3:tvurceVysledku
Krofta, Karel
n3:zamer
n14:MSM1486434701
s:issn
0023-5830
s:numberOfPages
8