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Brettanomyces

No change in size, 17:57, 12 October 2017
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When pitching just ''Brettanomyces'' from a commercial pure or blended culture and no other microbes, it is recommended to make a starter for the culture. If the ''Brettanomyces'' is being pitched into secondary, no starter is necessary unless the brewer suspects that the ''Brettanomyces'' has lost a lot of viability due to age, heat exposure, etc., or prefers higher cell count pitches (current information suggests that there is no significant flavor difference between high and low pitching rates in secondary pitches of ''Brettanomyces''; see [[Brettanomyces secondary fermentation experiment]]). ''Brettanomyces'' growth is inhibited by the concurrent growth of ''S. cerevisiae'' under anaerobic conditions. In aerobic conditions, oxygen appears to help ''Brettanomyces'' out-compete ''S. cerevisiae''. The presence of lactic acid bacteria does not greatly effect ''Brettanomyces'' growth <ref name="Hubbe"></ref><ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1362220513806159/ MTF post by Brian Martyniak on ''Brettanomyces'' growth in competition with ''Saccharomyces'' under aerobic and anaerobic conditions. 07/29/2016.]</ref>. Therefore, when making starters for mixed cultures of ''Brettanomyces'' and ''Saccharomyces'', the brewer can favor ''Saccharomyces'' by limiting oxygen, or favor ''Brettanomyces'' by introducing oxygen during growth. Data from Thomas Hübbe and Mark Trent support that the initial pitching rate doesn't have a great effect on the final cell count in pure ''Brettanomyces'' starters or beer, indicating that ''Brettanomyces'' is fairly forgiving in regards to small initial cell counts <ref name="Hubbe"></ref><ref>[[Brettanomyces_Propagation_Experiment|MTF ''Brettanomyces'' Propagation Experiment]]</ref>.
Just like in other yeast species, temperature has a direct effect on the rate of growth for ''Brettanomyces''. The optimal growth rate temperature range for ''Brettanomyces'' is between 25-32°C (77-90°F). Growth is about half as slow at 20°C (68°F). ''Brettanomyces'' will still grow at temperatures as low as (and maybe lower than) 15°C (59°F) and will be much slower, however one study showed a slightly higher viability during the full -time period of fermentation at 15°C as opposed to the optimal growth temperature range of 20-32°C. At a temperature of 35°C (95°F), both growth and viability over time are greatly inhibited <ref name="Brandam_2008">[http://oatao.univ-toulouse.fr/1595/1/Brandam_1595.pdf Effect of temperature on Brettanomyces bruxellensis: metabolic and kinetic aspects. Brandam C, Castro-Martínez C, Délia ML, Ramón-Portugal F, Strehaiano P. 2008.]</ref>.
* For information on mixed culture starters, see [[Mixed_Cultures#Starters_and_Other_Manufacturer_Tips|Mixed Culture Starters]].

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