Houben-Weyl Methoden der organischen Chemie vol.10-3 by Putter R., et al. (eds.)

By Putter R., et al. (eds.)

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Adding and mixing the isomerized extraxts with beer is also much more difficult than might be expected. Pre-isomerized extracts are ideally suited for correcting bitter level faults in finished beers; this application is on the increase. Furthermore, the quality of pre-isomerized formulations may be expected to improve continuously as a better understanding of the problems cited above is reached. 4. ECONOMICS AND UTILIZATION YIELD OF HOPS. As mentioned in the preceding section, there are several ways to use hops in the brewery.

The Laboratory of Organic Chemistry of the University of Gent picked up the thread in 1945, followed by the Brewing Research Foundation at Nutfield in Great Britain. Results were soon forthcoming, which initiated a real research boom in this field with many scientific publications on hop chemistry from laboratories all over the world. The greatest progress became possible only with the advent of better separation techniques (Counter-Current Distribution-CCD and Gas Chromatography-GC) and with the application of the new spectrometric techniques (especially NMR).

These isomerized extracts can therefore be added at a later stage in the beer production process, preferably as late as possible in order to increase their utilization yield. Notwithstanding the obvious economic advantages of using pre-isomerized hop extracts, they have not achieved 11 the expected success for a number of reasons. Brewers have a reputation for their aversion to change. Pre-isomerized extracts do influence beer taste and however small the change may be, this is deemed to be unacceptable.

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