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Food microbiology v.70, 2018년, pp.76 - 84   SCI SCIE
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Primary souring: A novel bacteria-free method for sour beer production

Osburn, Kara    (Molecular and Cellular Biochemistry Department, 212 South Hawthorne Drive, Simon Hall MSB1, Room 405B, Indiana University, Bloomington, IN 47405, USA   ); Amaral, Justin    (Mainiacal Brewing Company, Bangor, ME 04401, USA   ); Metcalf, Sara R.    (Molecular and Cellular Biochemistry Department, 212 South Hawthorne Drive, Simon Hall MSB1, Room 405B, Indiana University, Bloomington, IN 47405, USA   ); Nickens, David M.    (Molecular and Cellular Biochemistry Department, 212 South Hawthorne Drive, Simon Hall MSB1, Room 405B, Indiana University, Bloomington, IN 47405, USA   ); Rogers, Cody M.    (Molecular and Cellular Biochemistry Department, 212 South Hawthorne Drive, Simon Hall MSB1, Room 405B, Indiana University, Bloomington, IN 47405, USA   ); Sausen, Christopher    (Molecular and Cellular Biochemistry Department, 212 South Hawthorne Drive, Simon Hall MSB1, Room 405B, Indiana University, Bloomington, IN 47405, USA   ); Caputo, Robert    (Wild Pitch Yeast, Bloomington, IN 47405, USA   ); Miller, Justin    (Wild Pitch Yeast, Bloomington, IN 47405, USA   ); Li, Hongde    (Department of Biology, Indiana University, 1001 East Third Street, Bloomington, IN 47405, USA ;  ); Tennessen, Jason M.   Bochman, Matthew L.  
  • 초록  

    Abstract In the beverage fermentation industry, especially at the craft or micro level, there is a movement to incorporate as many local ingredients as possible to both capture terroir and stimulate local economies. In the case of craft beer, this has traditionally only encompassed locally sourced barley, hops, and other agricultural adjuncts. The identification and use of novel yeasts in brewing lags behind. We sought to bridge this gap by bio-prospecting for wild yeasts, with a focus on the American Midwest. We isolated 284 different strains from 54 species of yeast and have begun to determine their fermentation characteristics. During this work, we found several isolates of five species that produce lactic acid and ethanol during wort fermentation: Hanseniaspora vineae , Lachancea fermentati , Lachancea thermotolerans , Schizosaccharomyces japonicus , and Wickerhamomyces anomalus . Tested representatives of these species yielded excellent attenuation, lactic acid production, and sensory characteristics, positioning them as viable alternatives to lactic acid bacteria (LAB) for the production of sour beers. Indeed, we suggest a new LAB-free paradigm for sour beer production that we term “primary souring” because the lactic acid production and resultant pH decrease occurs during primary fermentation, as opposed to kettle souring or souring via mixed culture fermentation. Highlights The fermentative capabilities of 284 wild yeasts were characterized. Isolates from five species generate lactic acid during fermentation. Primary souring can be used without bacteria to make sour beer.


  • 주제어

    Yeast .   Lactic acid .   Sour beer .   Heterolactic fermentation.  

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