Chemical properties of the naturally dried hop plant and it's influence on the quality of beer | Kemijske značilnosti na rastlini naravno posušenega hmelja in njihov vpliv na kakovost piva
2003
VIRANT, Majda
Inglés. In the past five years we have been monitoring the chemical composition of two hop cultivars Aurora and Bobek, harvested during the time of technical maturity and naturally dried on the hop plant in the hop garden. The hop was harvested at the end of November or at the beginning of December. The influence of chemical changes on hop resins, the quantity of essential oil and the composition of the oils was measured in beer, brewed in the pilot brewery. The results show that late harvest of so-called 'Ice Hop' affects the colour of wort and beer (more intense), the content of polyphenols and anthocyanogenes is reduced and the utilisation of alpha acids is better. It also affects the sensory estimates of beer.
Mostrar más [+] Menos [-]Esloveno. V obdobju 5 let smo spremljali kemijski sestav hmelja kultivarjev Aurora in Bobek obranega v času tehnološke zrelosti in naravno (v hmeljišču na rastlini) posušenega hmelja, obranega koncem novembra, oziroma v začetku decembra. Vpliv kemijskih sprememb hmeljnih smol, ter količine eteričnega olja in njegove sestave smo ugotavljali na pivu proizvedenem v pilotni varilnici. Izsledki kažejo, da pozno obiranje tako imenovanega 'ledenega hmelja' vpliva na intenzivnejšo barvo pivine in piva, na zmanjšano vsebnost polifenolov in antocianogenov, na boljši izkoristek alfa kislin in na senzorično oceno piva.
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