Determination of Bitter Compounds in Hops - Effect of Crop Year and Hops Age

Krofta, Karel; Mikyška, Alexandr; Jurková, Marie; Moravcová, Lenka; Vondráčková, Petra

doi:10.18832/kp201725

Cited by 4 publications

(5 citation statements)

References 9 publications

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“…It should be noted that the results obtained using different methods are not fully comparable. The values obtained by the lead conductance methods are generally higher than the values obtained by the HPLC method in accordance with Analytica EBC because the lead conductance value also covers additional components of the hop resins (Krofta et al, 2017).…”

Section: Introductionsupporting

confidence: 66%

Analysis and prognosis of bitter acids content in Czech hop varieties – year 2020 and long-term comparisons and trends

Mikyška

Belešová

Tichá

2021

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The article deals with the harvest forecast of the content of bitter acids in Czech hop varieties harvested in 2020. This is presented in the context of long-term trends in the content and composition of bitter acids analogues and the stability of the varietal characteristics in the aforementioned harvest. This analysis is usually available at the end of the calendar year. 180 hop samples were analysed using EBC 7.7 (HPLC) method. The α-acids content in the most important variety of Saaz (3.65% in dry matter) was 12.8% rel. higher than in the 2019 harvest and 4.2% rel. higher than the 28-year average. The α-acids content in Saaz Late (3.23%), Sladek (7.9%), Kazbek (6.4%) and Agnus (12.4%) was significantly higher than both the long-term averages for the varieties and the harvest of 2019. The Premiant (8.0%) variety was close to the long-term average. The ratio of α-/β-acids, the relative content of cohumulone and the relative content of colupulone were consistent with long-term averages of the tested varieties. It was confirmed that the harvest forecast provides timely information on the α-acids content of the given harvest, the results being in good agreement with the values of the final evaluation of all harvested hops.

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Section: Introductionsupporting

confidence: 66%

Analysis and prognosis of bitter acids content in Czech hop varieties – year 2020 and long-term comparisons and trends

Mikyška

Belešová

Tichá

2021

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“…The results obtained using different methods are not fully comparable. The values obtained by lead conductance methods are generally higher than the values obtained by the HPLC method in accordance with Analytica EBC because the lead conductance value also covers additional components of the hop resins (Krofta et al 2017). The content and composition of hop resins as well as other secondary metabolites important for beer brewing and pharmaceutical industry, eg.…”

Section: Introductionmentioning

confidence: 57%

Analysis and prognosis of bitter acids content in Czech hop varieties - year 2018 and long-term comparisons and trends

Mikyška¹,

Jurková²

2019

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This article presents the results of the harvest forecast of the alpha- and beta-bitter acids of the Czech hop varieties in the 2018 harvest, the results are discussed in relation to the long-term averages, the composition of the bitter acid analogs and the stability of the varietal characteristics. 180 hop samples were analyzed using EBC 7.7 (HPLC) method. The alpha-acid content of the most important Saaz variety (2.9% in dry matter) was identical to the 2017 harvest and 18% rel. lower than the 26-year average. The alpha-acid content of Sladek (5.0%), Premiant (4.8%), and Saaz Late (1.6%) varieties was significantly lower than the long-term average. The harvest of the hops of the Kazbek and Agnus varieties was close to the long-term average. The ratio of alpha- and beta-acids, the relative content of cohumulone and the relative content of colupulone were consistent with long-term averages for the tested varieties. It was confirmed, that the harvest forecast gives timely information on the alpha-acids content of the harvest, the results were in good agreement with the values of the final evaluation of all harvested hops samples.

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“…A multi-year comparison of the harvest forecast results and actual harvesting data shows that the results are in good agreement (Krofta et al, 2017). The harvest prognosis gives a fairly good picture of the quality of the hops in advance of the overall harvest results that are available only in January of the following year.…”

Section: / 2018 (3)mentioning

confidence: 81%

“…natelné. Výsledek konduktometrického stanovení je zpravidla vyšší nežli výsledek analýzy metodou HPLC podle EBC, při konduktometrickém stanovení se totiž uplatňují i další složky chmelových pryskyřic (Krofta et al, 2017).…”

Section: Growing Are žAtecunclassified

“…Jsou tedy k dispozici výsledky sledování kvality chmele v ČR touto metodou za dvacet tři let. Hodnoty stanovené různými metodami nejsou plně porov- ance method are generally higher than the values obtained by the HPLC method accordance with Analytica EBC because the lead conductance value also covers additional components of the hop resins (Krofta et al, 2017).…”

Section: ■ ■ 1 Introductionunclassified

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Evaluation of α- and β-Bitter Acids Content in Harvest of Czech Hops in 2017

Mikyška¹,

Jurková²

2018

Kvasny Prum

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This article presents the results of the harvest forecast of the α-and β-acid content of the Czech hop varieties in the 2017 harvest (194 samples in total). Hops were analyzed using EBC 7.7 (HPLC) method. The results are discussed in relation to the long-term averages, structure of bitter acids analogs and stability of varietal character. The α-acid content of the Saaz variety (2.81% in dry matter) was 20% rel. lower than the 25-year average, the content of α-acids in the varieties with a later maturity date, Sládek, Premiant, Agnus, Kazbek and Saaz Late, was only slightly lower or comparable to the multi-annual averages. The ratio of α-and β-acids, the relative content of cohumulone and the relative content of colupulone were consistent with long-term averages for the tested varieties. The harvest forecast gives a timely information on the α-acids content of the harvest, the results were in good agreement with the results of the whole harvested hops.

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Determination of Bitter Compounds in Hops - Effect of Crop Year and Hops Age

Cited by 4 publications

References 9 publications

Analysis and prognosis of bitter acids content in Czech hop varieties – year 2020 and long-term comparisons and trends

Analysis and prognosis of bitter acids content in Czech hop varieties – year 2020 and long-term comparisons and trends

Analysis and prognosis of bitter acids content in Czech hop varieties - year 2018 and long-term comparisons and trends

Evaluation of α- and β-Bitter Acids Content in Harvest of Czech Hops in 2017

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