Abstract
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.
Highlights
This paper presents the evaluation of the harvest forecast for the content of α- and β -bitter acids in significant Czech hop cultivars from the 2018 harvest
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 Agnus variety has been evaluated since 2009, aroma variety Kazbek since 2014, and in 2015 started the assessment of aroma variety Saaz Late, which was recommended by the Research Institute of Brewing and Malting (RIBM) for beer production according to PGI Czech beer in 2013 (Mikyška et al 2013)
Summary
This paper presents the evaluation of the harvest forecast for the content of α- and β -bitter acids in significant Czech hop cultivars from the 2018 harvest. The evaluation of the α- and β -bitter acids of the harvested hops at the Research Institute of Brewing and Malting (RIBM) is carried out yearly and has been done since 1950. In 2004 the RIBM started the evaluation of other Czech hop varieties Sládek and Premiant which are important for domestic breweries (Mikyška 2010). The most important variety is still the Saaz variety, it was cultivated on 86.6% of all hop yards in the Czech Republic in 2018. Other Czech varieties Sládek, Premiant, Agnus, Kazbek and Saaz Late cultivated on 6.4%, 3.4%, 0.8%, 0.7% and 0.9% of the hop yards, are from this point of view only minor varieties (Barborka 2019a)
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