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| Description
| - Excellent liquid chromatographic (LC) separation of cis/trans stereoisomers of iso-alpha-acids has been achieved with reversedphase sorbent XTerra MS C18. An isocratic alkaline mobile phase, consisting of a mixture of 5 mmol l-1 ammonium acetate (pH 8)-acetonitrile-methanol, 62:21:17 (v/v/v), was used. In the DCHA-Iso international calibration standard trans-isoposthumulone was identified combining photo diode array (PDA) spektra and electrospray high-accuracy mass spectrometric (MS) data. Moreover, the molecular mass of two degradation products resulting from the in-solution storage of the DCHA-Iso standard was determined. The presence of trans and cis isomers of isoposthumulone, isocohumulone, isoadhumulone and iso-n-humulone in beer samples was confirmed. The trans isomers of iso-alpha-acids showed characteristic and reproducibly slightly different ultraviolet absorbance spectra with respect to cis isomers.
- Excellent liquid chromatographic (LC) separation of cis/trans stereoisomers of iso-alpha-acids has been achieved with reversedphase sorbent XTerra MS C18. An isocratic alkaline mobile phase, consisting of a mixture of 5 mmol l-1 ammonium acetate (pH 8)-acetonitrile-methanol, 62:21:17 (v/v/v), was used. In the DCHA-Iso international calibration standard trans-isoposthumulone was identified combining photo diode array (PDA) spektra and electrospray high-accuracy mass spectrometric (MS) data. Moreover, the molecular mass of two degradation products resulting from the in-solution storage of the DCHA-Iso standard was determined. The presence of trans and cis isomers of isoposthumulone, isocohumulone, isoadhumulone and iso-n-humulone in beer samples was confirmed. The trans isomers of iso-alpha-acids showed characteristic and reproducibly slightly different ultraviolet absorbance spectra with respect to cis isomers. (en)
- Excelentní rozdělení cis/trans stereoisomerů iso-alpha-kyselin bylo dosaženo kapalinovou chromatografií s použitím sorbetu reverzní fází XTerra MS C18. Isokratická alkalická mobilní fáze sestávající se ze směsi 5 mmol l-1 octanu amonného (pH 8)-acetonitril-methanol, 62:21:17 (v/v/v). V DCHA-iso mezinárodním kalibračním standardu byl identifikován trans-isoposthumulon pomocí kombinace detekce diodového pole (spektra) a dat získaných vysoko-rozlišující hmotnostní spektrometrií s ionizací elektrosprejem. Dále byla změřena hmota dvou degradačních produktů, které vznikají při skladování kalibračního roztoku DCHA-iso standardu. Přítomnost trans a cis isomerů isoposthumulonu, isokohumulonu, isoadhumulonu and iso-n-humulonu Byla potvrzena ve vzorcích piva. Trans isomery of iso-alfa-kyselin vykazují charakteristické mírně odlišné spektra ve srovnání s cis isomery. (cs)
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| Title
| - Liquid Chromatography-Diode Array
- Liquid Chromatography-Diode Array (en)
- Kapalinová chromatografie iso-alfa-kyselin v DCHA-iso standardu a pivu s detekci diodovým polem a hmotovou spektrometrií s ionizací elektrosprejem (cs)
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| skos:prefLabel
| - Liquid Chromatography-Diode Array
- Liquid Chromatography-Diode Array (en)
- Kapalinová chromatografie iso-alfa-kyselin v DCHA-iso standardu a pivu s detekci diodovým polem a hmotovou spektrometrií s ionizací elektrosprejem (cs)
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| skos:notation
| - RIV/60461373:22330/07:00019110!RIV08-MSM-22330___
|
| http://linked.open.../vavai/riv/strany
| |
| http://linked.open...avai/riv/aktivita
| |
| http://linked.open...avai/riv/aktivity
| - P(1M0570), Z(MSM6046137305)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
| |
| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22330/07:00019110
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - Beer; DCHA-Iso standard; electrospray; food analysis; high-accuracy mass spectrometry; isoadhumulone; isocohumulone; iso-n-humulone; isoposthumulone; UV spectra (en)
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| http://linked.open.../riv/klicoveSlovo
| |
| http://linked.open...odStatuVydavatele
| - GB - Spojené království Velké Británie a Severního Irska
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| http://linked.open...ontrolniKodProRIV
| |
| http://linked.open...i/riv/nazevZdroje
| - Journal of the Institute of Brewing
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Dostálek, Pavel
- Sýkora, David
- Hofta, Pavel
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| http://linked.open...n/vavai/riv/zamer
| |
| issn
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| number of pages
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| http://localhost/t...ganizacniJednotka
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