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首页> 外文期刊>Journal of the Institute of Brewing >Assessment of changes in hop resins and polyphenols during long-term storage
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Assessment of changes in hop resins and polyphenols during long-term storage

机译：评估啤酒花树脂和多酚在长期储存过程中的变化

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摘要

Changes in the content and composition of hop secondary metabolites during storage are reflected in beer quality and in the economics of beer production. A 12-month storage experiment with T90 pellets of four hop varieties showed different dynamics of hop aging in relation to both storage conditions and hop variety. Negligible effects on the α- and β-acids were detected during storage without air access at +2 ℃. Storage at +20 ℃ resulted in a final loss of 20-25% a-acids, but the content of β-acids did not change significantly. Large decreases in a-acids (64-88%) and in β-acids (51-83%) were found in hops stored with access to air at +20 ℃. The rate of decline accelerated markedly after 6 months of storage. In terms of hop resin changes, Premiant and Sladek were the most and the least stable varieties, respectively. After 12 months, the content of the total polyphenols and flavonoids decreased by 30-40% and by 20-30%, respectively, irrespective of storage conditions. The rate of decline accelerated strongly after 6 months. The DPPH (1,1 -diphenyl-2-picrylhydrazyl) antiradical potential decrease was significant only in hops stored under aerobic conditions. The depletion was 9-25% after 1 year; Saaz was the most stable variety.
机译：啤酒花次生代谢产物的含量和组成在存储过程中的变化反映在啤酒质量和啤酒生产的经济性中。用四个啤酒花品种的T90颗粒进行的为期12个月的储存实验显示，啤酒花老化的动力学与储存条件和啤酒花品种有关。在+2℃下没有空气进入的储存过程中，对α-和β-酸的影响可忽略不计。在+20℃下储存导致最终损失20-25％的a-酸，但β-酸的含量没有明显变化。在+20℃下可以接触空气的啤酒花中，α-酸（64-8％）和β-酸（51-83％）的下降幅度很大。储存六个月后，下降速度明显加快。就啤酒花树脂的变化而言，Premiant和Sladek分别是最稳定和最不稳定的品种。 12个月后，不管储存条件如何，总多酚和类黄酮的含量分别下降了30-40％和20-30％。 6个月后，下降速度大大加快。仅在有氧条件下储存的啤酒花中，DPPH（1,1-二苯基-2-吡啶基肼基）的抗自由基潜力明显降低。一年后的耗竭率为9-25％；萨斯（Saaz）是最稳定的品种。

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