ULLAGE & SPILLAGE | brewing
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Selected strains are scaled up in medium-size equipment familiar to most home brewers. Bright then works with commercial partners to trial their strains in fullsize brewery operations.
These will come as 500-gram packs of active dry yeast. Bright hopes eventually to supply home brewers, but that will require very different packaging and distribution channels.
As an example, Bright’s new Saison yeast had the gene responsible for diastatic activity removed so that it produces that classic fully attenuated dryness without the potential to ferment dextrins in can or bottle, which could lead to serious over-carbonation. Furthermore, if this yeast contaminates another used in the brewery, it will not cause over-attenuation in the beers produced.
One trait that will be of special interest to brewery owners is the capacity of certain yeast strains to release additional terpenes and thiols from non-flavoured compounds in hops. That means brewers can use lower amounts for dry hopping and still get the desired level of resinous or herbal flavours from the terpenes and tropical fruit flavour from thiols.
A Bright Brewers technologist locates and manipulates specific yeast cells under the microscope.
Brewers typically collect yeast cells from one brew to pitch into the next. However, unless sophisticated lab facilities are present on site, a batch of yeast can only be used about seven to ten times. After that a fresh culture is needed, since there is too much potential for contamination or development of undesirable characteristics.
• • • • • •
Bright Brewers Yeast now have over 5000 strains stashed away in their culture collection. Through their partners, Angel Yeast, Bright plans to release eight new products to commercial brewers by the end of the summer, including:
An English ale strain with medium attenuation An American ale yeast with low ester production A New England–type strain which will develop tropical fruit flavours A cold-tolerant ale yeast for Kolsch A clean fermenting lager yeast A Belgian strain for high-gravity brewing producing dried fruit esters A wheat strain with improved consistency A Saison yeast with no risk of gushing cans or bottles
Bright Brewing’s rapid selective breeding technologies create the potential for entirely new styles of beer. Bright’s scientists would very much welcome brewer input on the characteristics they are looking for in a yeast strain, by email or through their web site, www. brewingbright.com. J. Random is a former VP of CAMRA Vancouver, occasional homebrewer and has written for What's Brewing since 2003.
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S U M M E R 2019 WHAT'S BREWING 45