Showing posts with label fermentation. Show all posts
Showing posts with label fermentation. Show all posts

Thursday, September 24, 2009

Brewing Yeast and Fermentation

Brewing Yeast and Fermentation

Brewing Yeast and Fermentation
By Chris Boulton, David Quain

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Product Description

Now Available for the First Time in Paperback!

This unique volume provides a definitive overview of modern and traditional brewing fermentation. Written by two experts with unrivalled experience from years with a leading international brewer, coverage includes all aspects of brewing fermentation together with the biochemistry, physiology and genetics of brewers' yeast. Brewing Yeast and Fermentation is unique in that brewing fermentation and yeast biotechnology are covered in detail from a commercial perspective.


Now available for the first time in paperback, the book is aimed at commercial brewers and their ingredient and equipment suppliers (including packaging manufacturers). It is also an essential reference source for students on brewing courses and workers in research and academic institutions.


  • Definitive reference work and practical guide for the industry.
  • Highly commercially relevant yet academically rigorous.
  • Authors from industry leading brewers.

Product Details

  • Amazon Sales Rank: #928014 in Books
  • Published on: 2006-05-22
  • Original language: English
  • Number of items: 1
  • Binding: Paperback
  • 656 pages

Editorial Reviews

Review
“… easily the most comprehensive book on the subject, now reissued in paperback at a more accessible price. The wealth of detail is extraordinary and the scholarship displayed by the authors, who between them have over 50 years experience of microbiological research in the brewing industry, is exemplary. …[a] splendid, well produced and clearly illustrated book. It will continue to be the definitive text for the foreseeable future.”
Microbiology Today, November 2006




“This is a “must-have” book [and] will be used as a prime reference text for many years… should be in every brewing library, and on the bookshelf of anyone who has an interest in brewing yeast and fermentation at the advanced level…it has very rapidly become the first reference book I turn to when looking for detailed information on yeast…highly recommended”
Inge Russell, Journal of The Institute of Brewing Vol 109, No. 2, 2003



".a valuable resource for researchers in industry or academia interested in beer fermentation. "
Journal of Food Quality, Vol 25:3, Food & Nutrition Press Inc.

"Recommended to all researchers with an interest in yeast technology and brewing fermentation"
E-Streams, 2002

"This book provides a definitive review of modern and traditional brewery fermentation." Cerevisia, Belgian Journal of Brewing and Biotechnology, Vol 30, 2005

From the Back Cover
This unique volume provides a definitive overview of modern and traditional brewing fermentation. Written by two experts with unrivalled experience from years with a leading international brewer, coverage includes all aspects of brewing fermentation together with the biochemistry, physiology and genetics of brewers' yeast. Brewing Yeast and Fermentation is unique in that brewing fermentation and yeast biotechnology are covered in detail from a commercial perspective.


Now available for the first time in paperback, the book is aimed at commercial brewers and their ingredient and equipment suppliers (including packaging manufacturers). It is also an essential reference source for students on brewing courses and workers in research and academic institutions.

About the Author
Chris Boulton, Coors Brewers Limited, Burton on Trent, UK and David Quain, red.ts Ltd, Willington, Derbyshire, UK

Saturday, June 21, 2008

Beer Brewing Basics

Beer
From Wikipedia, the free encyclopedia

Beer is made by brewing. The essential stages of brewing are mashing, sparging, boiling, fermentation, and packaging. Most of these stages can be accomplished in several different ways, but the purpose of each stage is the same regardless of the method used to achieve it.

Mashing manipulates the temperature of a mixture of water and a starch source (known as mash) in order to convert starches to fermentable sugars. The mash goes through one or more stages of being raised to a desired temperature and left at the temperature for a period of time. During each of these stages, enzymes (alpha and beta amylase primarily) break down the long dextrins that are present in the mash into simpler fermentable sugars, such as glucose. The number of stages required in mashing depends on the starch source used to produce the beer. Most malted barley used today requires only a single stage.
Sparging (a.k.a. lautering) extracts the fermentable liquid, known as wort, from the mash. During sparging the mash is contained in a lauter-tun, which has a porous barrier through which wort but not grain can pass. The brewer allows the wort to flow past the porous barrier and collects the wort. The brewer also adds water to the lauter-tun and lets it flow through the mash and collects it as well. This rinses fermentable liquid from the grain in the mash and allows the brewer to gather as much of the fermentable liquid from the mash as possible. The leftover grain is not usually further used in making the beer. However, in some places second or even third mashes would be performed with the not quite spent grains. Each run would produce a weaker wort and thus a weaker beer.
Boiling sterilises the wort and increases the concentration of sugar in the wort. The wort collected from sparging is put in a kettle and boiled, usually for about one hour. During boiling, water in the wort evaporates, but the sugars and other components of the wort remain; this allows more efficient use of the starch sources in the beer. Boiling also destroys any remaining enzymes left over from the mashing stage as well as coagulating proteins passing into the wort, especially from malted barley, which could otherwise cause protein 'hazes' in the finished beer. Hops are added during boiling in order to extract bitterness, flavour and aroma from them. Hops may be added at more than one point during the boil. As hops are boiled longer, they contribute more bitterness but less hop flavour and aroma to the beer.
Fermentation uses yeast to turn the sugars in wort to alcohol and carbon dioxide. During fermentation, the wort becomes beer. Once the boiled wort is cooled and in a fermenter, yeast is propagated in the wort and it is left to ferment, which requires a week to months depending on the type of yeast and strength of the beer. In addition to producing alcohol, fine particulate matter suspended in the wort settles during fermentation. Once fermentation is complete, the yeast also settles, leaving the beer clear. Fermentation is sometimes carried out in two stages, primary and secondary. Once most of the alcohol has been produced during primary fermentation, the beer is transferred to a new vessel and allowed a period of secondary fermentation. Secondary fermentation is used when the beer requires long storage before packaging or greater clarity.
Pasteurisation is an optional stage of the beer process in which the beer is slowly heated and cooled to kill off any existing bacteria in order to maintain longer shelf life. This is generally a stage not included in higher end beers, but is quite common in mass-produced beers such as American-Style lite beers, and other mass-produced lagers. It is less common in ales as pasteurization can change the many flavours.
Packaging, the fifth and final stage of the brewing process, prepares the beer for distribution and consumption. During packaging, beer is put into the vessel from which it will be served: a keg, cask, can or bottle. Beer is carbonated in its package, either by forcing carbon dioxide into the beer or by "natural carbonation". Naturally carbonated beers may have a small amount of fresh wort/sugar and/or yeast added to them during packaging. This causes a short period of fermentation which produces carbon dioxide.