Keeping beer fresh longer

Researchers are reporting discovery of a scientific basis for extending the shelf life of beer so that it stays fresh and tastes good longer. For the first time, they identified the main substances that cause the bitter, harsh aftertaste of aged beer and suggest that preventing the formation of these substances could help extend its freshness. Their findings appear in ACS' Journal of Agricultural and Food Chemistry.

Thomas Hofmann and colleagues point out that beer can develop an unpleasant, bitter aftertaste as it ages. Unlike , scotch whiskey, and bourbon, beer tastes best when consumed fresh. Experts estimate that the average beer goes bad after 6 to 12 months of storage. Scientists have identified several dozens of the key bitter-tasting substances formed during beer manufacturing — mostly so-called "prenylated polyketides" derived from hops. Until now, however, nobody had solid information about the bitter substances that form as beer ages.

The scientists analyzed a variety of commercial beers both before and after storage. They identified 56 substances that contribute to beer's bitter taste, including five that appear to be largely responsible for its harsh flavor after aging. "The present study offers the scientific basis for a knowledge-based extension of the shelf life of the desirable beer's bitter taste and the delay of the onset of the less preferred harsh aftertaste by controlling the initial pH value of the and by keeping the temperature as low as possible during of the final beverage," the study concludes.


Explore further

Keeping beer fresher

Citation: Keeping beer fresh longer (2011, April 13) retrieved 18 April 2019 from https://phys.org/news/2011-04-beer-fresh-longer.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
0 shares

Feedback to editors

User comments

Apr 13, 2011
This it not a discovery... it's been known throughout the beer world for a long, long time

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more