It is well known that alpha acids in hops are responsible for beers bitterness via their thermal isomerization into iso-alpha acids during the kettle boil. Alpha acids that don’t isomerize generally absorb onto the trub and yeast during fermentation, with little if any getting into the final beer.

It is well known that hop is a nitrate storing plant and therefore the concentrations are rather high, as shown in the graph below with the data from crop 2013. The various colors stand for different growing regions. Yellow (Spalt), blue (Tettnang), green (Hallertau) and red (Elbe-Saale) are the German growing areas and the US hops are presented in grey. The values vary between 4410 and 9900 mg/kg.

As in previous years we would like to demonstrate how the contribution of hop oils to beer can vary from one crop year to another. We have chosen linalool as a representative hop aroma substance as it correlates well with the sensory impression of hoppy aroma in beer.

The Hopsteiner Guidelines 2013 will soon be published and be available during November. We are still working on some details of the beer production and will present the balance of World Alpha Acid Supply and Demand as soon as possible.So far we have ἀnalized our estimate for the alpha production 2013 which we are pleased to present in the following charts: ...

On the occasion of the nomination of hops as the "Medicinal Plant of the Year 2007", Dr. Christoph Pinzl (Head of the German Hop Museum in Wolnzach) and Dr. Martin Biendl (Head of Research and Development at Hopsteiner, Mainburg) wrote a book on this subject. Since the first edition is now out of print, a second, updated edition has now been published.

Estimates for the 2013 hop crop in Germany were finalized in the Hallertau on August 21st. We are pleased to attach a list comparing the crop results for 2012 with the estimates for 2013 for the world’s main growing areas.

At the Hopsteiner Forum in June 2013, five different wheat beers were presented to an audience of brewers and brewing scientists showing the influence of different hop varieties used for dry hopping.

For the past year, Hopsteiner has been developing an in-house sensory panel to provide additional evaluation of hop varieties and products. The Hopsteiner Sensory Panel trains on a set of sixty aroma reference standards in order to correctly identify common aromas found in hops (e.g. lemon, pine, mango, rose, etc.).

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