About: Investigation of Czech hop varieties authenticity by means of chemical and genetic analyses

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://kvasnyprumysl.net/en/journal/2011/7-8/
Description	Autenticity of the current file of eleven Czech hop varieties was elaborated on the basis of analyses of alpha acids, beta acids, hop oils and prenylated flavonoids. Varietal discrimination was based on cohumulone ratio, contents of selected aliphatic esters and sesquiterpenes farnesene and selinenes in hop oils and content of xanthohumol, desmethylxanthohumol and xanthohumol/alpha acids ratio. Identification scheme was constructed with the help of these descriptors. Analyses of dried hops by molecular-genetic methods proved that identification of hop varieties is feasible from this material. Reliability of hop varieties identification generally depends on age of samples and on the way of raw hops processing to hop products. DNA analyses are not practicable in hop extracts and are limited in hop pellets due to DNA fractionation or destruction under processing conditions. Model tests of Saaz aroma variety adulteration with the help of chemical and geonome analyses identically showed that the lowest level of conclusiveness is at about of 10 % admixture. Recently discovered real incident of Saaz hops adulteration showed that proportion of unknown variety was in the interval of 50–70 %. Autenticity of the current file of eleven Czech hop varieties was elaborated on the basis of analyses of alpha acids, beta acids, hop oils and prenylated flavonoids. Varietal discrimination was based on cohumulone ratio, contents of selected aliphatic esters and sesquiterpenes farnesene and selinenes in hop oils and content of xanthohumol, desmethylxanthohumol and xanthohumol/alpha acids ratio. Identification scheme was constructed with the help of these descriptors. Analyses of dried hops by molecular-genetic methods proved that identification of hop varieties is feasible from this material. Reliability of hop varieties identification generally depends on age of samples and on the way of raw hops processing to hop products. DNA analyses are not practicable in hop extracts and are limited in hop pellets due to DNA fractionation or destruction under processing conditions. Model tests of Saaz aroma variety adulteration with the help of chemical and geonome analyses identically showed that the lowest level of conclusiveness is at about of 10 % admixture. Recently discovered real incident of Saaz hops adulteration showed that proportion of unknown variety was in the interval of 50–70 %. (en)
Title	Investigation of Czech hop varieties authenticity by means of chemical and genetic analyses Investigation of Czech hop varieties authenticity by means of chemical and genetic analyses (en)
skos:prefLabel	Investigation of Czech hop varieties authenticity by means of chemical and genetic analyses Investigation of Czech hop varieties authenticity by means of chemical and genetic analyses (en)
skos:notation	RIV/14864347:_____/11:#0000344!RIV12-MZE-14864347
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(QH81052)
http://linked.open...iv/cisloPeriodika	7-8
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Krofta, Karel Patzak, Josef
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Chmelařský institut s.r.o.
http://linked.open...dnocenehoVysledku	205690
http://linked.open...ai/riv/idVysledku	RIV/14864347:_____/11:#0000344
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	alpha and beta acids; hop oils and farnesene; DNA analyses (en)
http://linked.open.../riv/klicoveSlovo	DNA analyses alpha and beta acids hop oils and farnesene
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[50BCED2CFFEB]
http://linked.open...i/riv/nazevZdroje	Kvasný průmysl
http://linked.open...in/vavai/riv/obor	CB
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Development of molecular-genetic markers for modern breeding and gene engineering of hop (Humulus lupulus) based on the system of genomic and expression libraries.
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	57
http://linked.open...iv/tvurceVysledku	Krofta, Karel Patzak, Josef
issn	0023-5830
number of pages	9 (xsd:int)

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