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Fermentation/Maturation

Fermentation tanks in a craft brewery

Flavour and aroma variety | Yeast’s impressive natural biodiversity has often been overlooked in modern industrialized brewing in favour of workhorse yeast strains that offer consistency. Today, in an age of rapid expansion in brewing creativity, yeast’s biodiversity is being harnessed to help fuel innovation in beer making.

First International Workshop on Brewing Yeast | Yeast scientists and brewing technologists from all over the world met on 5 - 6 October 2018 in San Andrés de Bariloche, Argentina, to share their latest research findings on brewing yeast.


Designing Yeast | In this concluding section of our three-part series (part 1 and 2 see BRAUWELT International No. 5, 2018, pp. 354-356 and No. 6, 2018, pp. 430-432) we outline the various non-GMO methods by which new brewer’s yeast are being created to drive beer flavour and aroma innovations. By applying the classical technique of selective breeding – used for millennia in the domestication of species – it becomes possible to re-imagine brewer’s yeast, thereby enhancing and expanding yeast’s natural ability to define beer styles and flavours.


Controlling yeast | In the first part of this three-part article (BRAUWELT International No. 5, 2018, pp. 354-356), we outlined the enormous impact yeast has on the flavour and aroma profile of beer. In this sec ond part, we discuss the variables and methods by which brewers can exert direct control over yeast during the brewing process. In the concluding article, we will examine the time-honoured, non-GMO classical development techniques by which new and exciting yeasts are being developed to help create whole new flavour and aroma profiles in beer.


Describing flavour | Continuing our series on the topic Better Yeast, Better Beer, here we provide the first part of a three-part article explaining yeast’s significant potential in developing revolutionary new beer tastes and flavours to meet rising consumer demands for innovative beer tastes. In part two, we examine the many variables that brewers can exploit to modulate yeast impact on beer flavour and aroma. And finally, in part three, we explore the idea of developing novel brewer’s yeast strains, using classical non-GMO techniques, to help deliver better yeasts for better beer.


Yeast recycling | Yeasts are usually used for one fermentation cycle in industrial fermentation. In the brewing industry, however, yeasts are recycled several times, also as a result of a continuous succession of production processes. Consistent and, in particular, reproducible fermentation results have to be obtained. Optimal yeast management is required in order to achieve this objective. Moreover, the number of cycles is crucial for fermentation performance and depends on the yeast strain as well as on the experience and philosophy of the brewmaster.


Incredible diversity | Again and again, the excessive limitations posed by the Purity Law are being contested. However, the inconceivable diversity of one of the main components of beer brewing – yeast – has not been exhausted by far. Yeast, with the aroma components it produces, contributes to more than 70 per cent to overall aroma of beer and no two yeast strains are the same [1,2].


Better brewing | Counting yeast cells is one of the more tedious and repetitive tasks in the beer industry. It requires either a skilled professional to perform a manual count with a microscope and a hemocytometer or an expensive piece of equipment – or both. Challenges exist in this process, even for professionals performing a good cell count. Did I count that cell? Is that daughter cell 50 per cent the size of the mother cell or less? Should I count that blueish cell as alive or dead?


Well-Equipped | Paradise Beverages (Fiji) Ltd, based in Suva, Fiji, was originally part of Pacific Ltd, a subsidiary of Foster’s Group. The company changed its name in 2012, when it became a member of Coca-Cola Amatil (Fiji) Ltd. Currently, the brewery, founded in 1957, produces about 100 000 hl annually. Paradise Beverages’ flagship beer is Fiji Gold, a pale lager with 4.6 percent ABV and comprises about 60 percent of the brewery’s production. In addition to the gradual renovation of the production facilities for packaged beers, the establishment of a high-gravity production facility is the brewery’s latest project.


Benefits of Omnium | The Omnium by Ziemann® brewhouse concept that will be unveiled at drinktec 2017 is covered in the final part of a series of articles “A Novel Mash Filtration Process” published in BRAUWELT International and is the result of interdisciplinary research. Omnium is the integration of the novel Nessie by Ziemann® process for mash filtration, opening up new possibilities in brewhouse operation resulting from different approaches and wort composition.


Taming the Wild Yeast | How do the strains of yeast we use for brewing and baking differ from their wild cousins? And when did the changes that make them more amenable to food production occur? Chris White and his colleagues have devoted their professional lives to working with and studying the microbes we employ in industrial food production processes, especially Saccharomyces cerevisiae.