The Evaluation of alpha- and beta- Bitter Acid Contents of Czech and Moravian Hops from the 2012 Harvest

摘要

The contents of alpha- and beta- bitter acids from hops harvested in the Czech Republic in 2012 have been evaluated. The sampling was done in all three growing areas - Zatec (77.8% of the hop yard areas in the Czech Republic), Ustek (10.8%) and Trsice(11.5%). The Saaz variety (ZPC) was cultivated on 87.2% of the harvest areas, the Sladek variety on 5.5%, Premiant variety on 5.2% and the Agnus variety on 1.2% 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 a-bitter acids in the Saaz variety in the Czech Republic was 4.12% (in the Zatec area 4.21%, in the Ustek area 4.04% and in the Trsice area 3.84%). The content of p-bitter acids was 4.75%. The content of a-bitter acids was 0.08% lower when compared to the year 2011 and 0.45% higher when compared to the average of the last 19 years. The content of p-bitter acids was 0.38% lower when compared to the year 2011 and identicalto the long-term average. The average content of a-bitter acids in the Sladek variety in the Czech Republic was 6.98% and the content of beta-bitter acids was 5.24%. The content of alpha-bitter acids was 1.24% lower when compared to the harvest in 2011and identical to the average of the last 9 years. The content of alpha-bitter acids in the Premiant variety was 8.85% and the content of p-bitter acids was 5.12%. The content of alpha-bitter acids was in 0.23% and 0.78% lower when compared to the harvestin 2011 and to the average of the last 9 years respectively. The average content of a-bitter acids in the Agnus variety was 12.06% and the content of p-bitter acids was 6.01%. The content of alpha-bitter acids was 1.07% lower when compared to the harvest in 2011.