Brewing tests of new fine aroma hop varieties (Humulus lupulus L.) Saaz Brilliant, Saaz Comfort and Saaz Shine
Alexandr Mikyška (Research Institute of Brewing and Malting, Lípová 511/15, 120 00 Prague 2, Czech Republic) | Jitka Charvátová (Hop Research Institute, Kadaňská 2525, 438 01 Žatec, Czech Republic) | Karel Štěrba (Research Institute of Brewing and Malting, Lípová 511/15, 120 00 Prague 2, Czech Republic) | Martin Slabý (Research Institute of Brewing and Malting, Lípová 511/15, 120 00 Prague 2, Czech Republic) | Vladimír Nesvadba (Hop Research Institute, Kadaňská 2525, 438 01 Žatec, Czech Republic)
Characterization of varietal profiles of hop secondary metabolites in beer is of considerable importance for hop growing and brewing. This three-year study focused on pilot brewing tests of three new Saaz derived hop varieties, namely Saaz Brilliant, Saaz Shine and Saaz Comfort. The sensory profiles of kettle and kettle+dry single hopped beers were monitored. At the same time, the impact of dry hopping technology on sensory perception of final beers and changes in volatile compounds was investigated. Pilot brews (200 l) of 12% pale lager were prepared in kettle and kettle+dry variants using the new Czech varieties and traditional Saaz as a control sample. Essential oils in beers were determined by GC/MS-MS method with the aim to clarify links to the beer sensory profile of both, kettle and dry hopping mode. The descriptive sensory method of hop-derived aromas and the triangle tests were employed to determine the sensory quality of beer. The overall sensory impression of beers from all tested varieties was at least comparable to traditional Saaz, and Saaz Comfort even reached better evaluation. The profile of essential oils and hop flavours in beer was partially different, however it was not rated worse than Saaz. The kettle+dry hopped beers of new varieties were significantly different from Saaz in the triangle test, Saaz Brilliant was preferred over the Saaz. The results showed considerable potential of new varieties for the production of interesting and taste-specific beers and the enrichment of the spectrum of fine aroma varieties of Czech hops.
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