Summary Evaluation of bitter acids and polyphenols content in Czech hops harvest in 2013 - I: Contents of α- and β-Bitter Acids..

The contents of α- and β- bitter acids from hops harvested in the Czech Republic in 2013 have been evaluated. The sampling was done in all three growing areas - Žatec (77.8% of the hop yard areas in the Czech Republic), Úštěk (10.6%) and Tršice (11.7%). The Saaz variety (ŽPČ) was cultivated on 87.8% of the harvest areas, the Sládek variety on 5.6%, Premiant variety on 4.7% and the Agnus variety on 1.0% of the harvest areas. The hops were analyzed in accordance with the Analytica-EBC, method 7.7 (HPLC) and all results are given in weight % in dry matter. The average value for α-bitter acids in the Saaz variety in the Czech Republic was 3.34% (in the Žatec area 3.46%, in the Úštěk area 3.24% and in the Tršice area 2.90%). The content of β-bitter acids was 3.58%. The content of α-bitter acids was 0.78% (18.9% rel.) lower when compared to the year 2012 and 0.32% (8,7% rel.) lower when compared to the average of the last 20 years. The content of β-bitter acids was 1.17% lower when compared to the year 2012 and 1.15 lower to the long-term average. The average content of α-bitter acids in the Sládek variety in the Czech Republic was 6.17% and the content of β-bitter acids was 5.14%. The content of α-bitter acids was 0.81% (11.6% rel.) lower when compared to the harvest in 2012 and 0.68 % (9.9 % rel.) lower compared to the average of the last 10 years. The content of α-bitter acids in the Premiant variety was 8.35% and the content of β-bitter acids was 4.18%. The content of α-bitter acids was in 0.5% (5.6% rel.) and 1.05% (11.2% rel.) lower when compared to the harvest in 2011 and to the average of the last 10 years respectively. The average content of α-bitter acids in the Agnus variety was 11.16% and the content of β-bitter acids was 5.60%. The content of α-bitter acids was 0.9% (7.5% rel.) lower when compared to the harvest in 2012 and 0.62% (5.3% rel.) lower compared to average of last five years.The contents of α- and β- bitter acids from hops harvested in the Czech Republic in 2013 have been evaluated. The sampling was done in all three growing areas - Žatec (77.8% of the hop yard areas in the Czech Republic), Úštěk (10.6%) and Tršice (11.7%). The Saaz variety (ŽPČ) was cultivated on 87.8% of the harvest areas, the Sládek variety on 5.6%, Premiant variety on 4.7% and the Agnus variety on 1.0% of the harvest areas. The hops were analyzed in accordance with the Analytica-EBC, method 7.7 (HPLC) and all results are given in weight % in dry matter. The average value for α-bitter acids in the Saaz variety in the Czech Republic was 3.34% (in the Žatec area 3.46%, in the Úštěk area 3.24% and in the Tršice area 2.90%). The content of β-bitter acids was 3.58%. The content of α-bitter acids was 0.78% (18.9% rel.) lower when compared to the year 2012 and 0.32% (8,7% rel.) lower when compared to the average of the last 20 years. The content of β-bitter acids was 1.17% lower when compared to the year 2012 and 1.15 lower to the long-term average. The average content of α-bitter acids in the Sládek variety in the Czech Republic was 6.17% and the content of β-bitter acids was 5.14%. The content of α-bitter acids was 0.81% (11.6% rel.) lower when compared to the harvest in