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

Authors

  • Alexandr Mikyška Research Institute of Brewing and Malting, Lípová 511/15, 120 00 Prague 2, Czech Republic
  • Klára Belešová Research Institute of Brewing and Malting, Lípová 511/15, 120 00 Prague 2, Czech Republic
  • Jana Tichá Chmelarstvi, cooperative Zatec, Mostecká 2580, 438 01, Zatec, Czech Republic

DOI:

https://doi.org/10.18832/kp2021.67.474

Keywords:

hops harvest, alpha acids, beta acids, Saaz hops, Sladek, Premiant, Kazbek, Agnus, Saaz Late

Abstract

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.

References

Algazzali, V., Shellhammer, T. (2016). Bitterness Intensity of Oxidized Hop Acids: Humulinones and Hulupones. Journal of the American Society of Brewing Chemists, 74(1), 36–43. https://doi.org/10.1094/ASBCJ-2016-1130-01

Chromý, Z. (2021). České chmelařství v přehledech ÚKZÚZ. Chmelařská ročenka 2021, VÚPS, Praha, 296–321. ISBN 978-80-86576-92-3. Available only in Czech.

Chromý, Z. (2021a). Odrůdová skladba chmele. Chmelařská ročenka 2021, VÚPS, Praha, 322–324 ISBN 978-80-86576-92-3. Available only in Czech.

ČSN 462520 (1997). Czech Technical Standard - Hops Testing part 15: Determination of lead conductance value of hops. Czech Standards Institute. Available only in Czech.

Dresel, M., Vogt, C., Dunkel, A., Hofmann, T. (2016). The Bitter Chemodiversity of Hops (Humulus lupulus L.). Journal of Agricultural and Food Chemistry, 64, 7789−7799. https://doi.org/10.1021/acs.jafc.6b03933

Dušek, M., Olšovská, J., Krofta, K., Jurková, M., Mikyška, A (2014). Qualitative determination of β acids and their transformation products in beer and hop using HR/AM-LC-MS/MS. Journal of Agricultural and Food Chemistry, 62, 7690−7697. https://doi.org/10.1021/jf501852r

EBC Analysis committee (2010). Analytica-EBC. Nürenberg, Fachverlag Hans Carl, pp. 794. ISBN 978-3-418-00759-5 Forster, A., Gahr, A. (2014). A Comparison of the Analytical and Brewing Characteristics of Cascade and Comet Hop Varieties as Grown in Yakima (USA) and Hallertau (Germany). Brewing Science, 67(11/12), 138–148.

Forteschi, M., Porcu, M.C., Fanari, M., Zinellu, M., Secchi, N., Buiatti, S., Passaghe, P., Bertoli, S., Pretti, L. (2018). Quality assessment of Cascade Hop (Humulus lupulus L.) grown in Sardinia. European Food Research and Technology, 245, 863–871. https://doi.org/10.1007/s00217-018-3215-0

Inui, T., Matsui, H., Hosoya, T., Kumazawa, S., Fukui, N., Oka, K. (2016). Effect of Harvest Time and Pruning Date on Aroma Characteristics of Hop Teas and Related Compounds of Saaz Hops. Journal of the American Society of Brewing Chemists, 74(4), 231–241. https://doi.org/10.1094/ASBCJ-2016-4628-01

Inui, T., Okumura K., Matsui, H., Hosoya, T., Kumazawa, S. (2017). Effect of harvest time on some in vitro functional properties of hop polyphenols. Food Chemistry, 225, 69–75. https://doi.org/10.1016/j.foodchem.2017.01.002

Jelínek, L., Dolečková, M., Karabin, M., Hudcová, T., Kotlíková, B., Dostálek, P. (2012). Influence of growing area, plant age, and virus infection on the contents of hop secondary metabolites. Czech Journal of Food Sciences, 30, 541–547. https://doi.org/10.17221/50/2012-CJFS

Kavalier, A.R., Litt, A., Ma, C., Pitra, N.J., Coles, M.C., Kennelly, E.J., Matthews, P.D. (2011). Phytochemical and Morphological Characterization of Hop (Humulus lupulus L.) Cones over Five Developmental Stages Using High Performance Liquid Chromatography Coupled to Timeof-Flight Mass Spectrometry, Ultrahigh Performance Liquid Chromatography Photodiode Array Detection, and Light Microscopy Techniques. Journal of Agricultural and Food Chemistry, 59, 4783–4793. https://doi.org/10.1021/jf1049084

Krofta, K., Klapal, I., Fritschová, G., Vojtěchová, D., Tichá, J. (2021). Hodnocení kvalitativních ukazatelů českých chmelů ze sklizně 2020 (Evaluation of qualitative indicators of Czech hops from the 2020 harvest). Chmelařství, 94(1-2), 8–13. Available only in Czech.

Krofta, K., Mikyška, A., Jurková, M., Mravcová, L., Vondráčková, P. (2017). Determination of Bitter Compounds in Hops – Effect of Crop Year and Hops Age. Kvasny prumysl, 63(5), 241–247. https://doi.org/10.18832/kp201725

Mikyška, A., Dušek, M. , Jurková, M. (2017). Evaluation of α- and β-bitter Acids Content in Harvest of Czech Hops in 2016. Kvasny prumysl, 63(4), 190–198. https://doi.org/10.18832/kp201721

Mikyška, A., Slabý, M., Jurková, M., Krofta, K., Patzak, J., Nesvadba, V. (2013). Saaz-Late – the Czech hop variety recommended for Czech beer. Kvasny prumysl, 59(10–11), 296–305. https://doi.org/10.18832/kp2013031

Nesvadba, V., Polončíková, Z., Henychová, A., Krofta, K., Patzak, J. (2012). Czech hop varieties. Chmelařský institut s.r.o. Žatec. ISBN 978-80-87357-11-8

Distribution of alpha-bitter acid content of Saaz hops harvested in 2020

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Published

2021-08-15

How to Cite

Mikyška, A., Belešová, K., & Tichá, J. (2021). Analysis and prognosis of bitter acids content in Czech hop varieties – year 2020 and long-term comparisons and trends. KVASNY PRUMYSL, 67(4), 474-483. https://doi.org/10.18832/kp2021.67.474
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