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| Brettanomyces | |
|---|---|
| Name | Brettanomyces |
| Domain | Eukaryota |
| Regnum | Fungi |
| Phylum | Ascomycota |
| Classis | Saccharomycetes |
| Ordo | Saccharomycetales |
| Familia | Saccharomycetaceae |
| Genus | Brettanomyces |
Brettanomyces is a genus of yeast recognized for its distinctive sensory contributions to fermented beverages and its role as both spoilage organism and craft-character organism. It has been studied across industrial microbiology, enology, and brewing science for its metabolic versatility, persistence in production environments, and capacity to produce phenolic and volatile compounds. Research on Brettanomyces intersects with institutions, regulatory agencies, historic breweries, and contemporary craft producers.
Brettanomyces species are placed within Saccharomycetales and have been reclassified over time by taxonomists at institutions such as the Natural History Museum and laboratories associated with the Royal Society and the American Society for Microbiology. Classical taxonomy relied on morphological features observable with microscopes like those in collections at the Smithsonian and the Wellcome Trust, while modern phylogenetics uses gene markers sequenced at universities including Harvard, Oxford, MIT, Stanford, UC Berkeley, and University of Copenhagen. Morphologically, isolates show budding patterns and pseudohyphal growth similar to yeasts characterized by the Linnean collections at Kew Gardens and the New York Botanical Garden. Species delineation has been guided by multilocus sequence typing in studies published by Elsevier, Springer, and Nature Research teams associated with the Max Planck Society and the Karolinska Institutet.
Brettanomyces has been isolated from environments curated by organizations such as the British Museum, the Dutch National Collection, and the Institut Pasteur, reflecting its presence in cellars, wooden barrels, and plant materials. Field surveys coordinated by the Food and Agriculture Organization, the United Nations Environment Programme, and regional agricultural extensions documented its occurrence on grapes, oak staves imported through ports like Rotterdam and Hamburg, and in wild fermentations studied by researchers at UC Davis, INRAE, and CSIRO. Ecological studies link Brettanomyces distribution with materials handled by cooperages servicing Château estates, distilleries in Scotland, wineries in Bordeaux, and craft breweries in Belgium, Germany, and the United States.
In winemaking, Brettanomyces has a dual reputation documented in reports from the International Organisation of Vine and Wine and case studies from estates such as Château Margaux, Domaine de la Romanée-Conti, and boutique producers covered by journals like Wine Spectator and Decanter. It can generate compounds that some tasters associated with terroir in tasting notes from sommeliers trained at institutions like Le Cordon Bleu, while regulatory frameworks from agencies such as the European Commission and the TTB address allowable practices. Winemakers using barrels from cooperages like Seguin Moreau and Francisco Esteves may encounter persistence of Brettanomyces in wood, leading to management strategies developed at research centers including the Australian Wine Research Institute and the Institute of Grapevine Physiology and Enology.
Brewers at historic breweries such as Cantillon, Westvleteren, and modern craft operations in Portland, Brussels, and Copenhagen intentionally employ Brettanomyces to produce sour and wild ales, a practice profiled by the Brewers Association and in books from publishers like Ten Speed Press and CAMRA. Conversely, commercial breweries distributing via channels like Molson Coors and Anheuser-Busch face contamination concerns investigated by quality control teams at Interbrew and SABMiller. Beyond beer, kombucha producers, cider houses, and distilleries documented in trade publications from Craft Distillers and the American Cider Association report interactions between Brettanomyces and other microbiota, with sensory outcomes discussed in reviews in journals such as Applied and Environmental Microbiology and Food Microbiology.
Brettanomyces exhibits metabolic pathways characterized in biochemical studies at institutions like the Max Planck Institute, ETH Zurich, and the Scripps Research Institute. It can metabolize sugars, hydroxycinnamic acids, and other precursors to generate 4-ethylphenol and 4-ethylguaiacol—compounds analyzed via instrumentation sold by Agilent, Shimadzu, and Thermo Fisher and reported in papers in journals by Elsevier and Springer Nature. Enzymes such as phenolic acid decarboxylases and vinyl phenol reductases have been sequenced in projects affiliated with EMBL-EBI, GenBank submissions from researchers at the University of Copenhagen, and proteomics efforts supported by the Wellcome Trust. Studies at biotechnology firms and academic labs including Novozymes, DSM, University of California labs, and Wageningen University probed stress responses relevant to tolerance to ethanol, low pH, and sulfite compounds regulated under standards from Codex Alimentarius.
Detection methods span culture-based approaches employed in quality labs at Heineken, Carlsberg, and Boston Beer Company, to molecular assays developed at UCSF, Imperial College London, and Kyoto University. Techniques include selective media used by microbiology teams at the FDA and CFIA, PCR and qPCR protocols standardized in publications by the Journal of Microbiological Methods, and metagenomic sequencing implemented in projects at the Broad Institute, EMBL, and the J. Craig Venter Institute. Analytical chemistry approaches using GC-MS and LC-MS are routine at university core facilities like those at MIT, UCLA, and the University of Toronto, and in contract labs accredited by ISO and EPA standards.
Control strategies are practiced by wineries and breweries represented by organizations such as the Brewers Association, the Wine Institute, and regional trade bodies; they include sanitation programs based on guidelines from the World Health Organization, cleaning-in-place systems used in facilities by Siemens and Alfa Laval, and sterilization approaches employing ozone generators and UV systems assessed in studies from NIST and the Oak Ridge National Laboratory. Chemical options leverage sulfite regimens aligned with OIV recommendations, while physical measures involve barrel management techniques used at cooperages and practices adopted by Château and distillery operations. Biocontrol research at academic centers like INRAE, UC Davis, and Wageningen explores competitive inoculation, bacteriophage-inspired strategies, and enzymatic remediation supported by biotechnology firms and patent filings reviewed at patent offices such as the EPO and USPTO.
Category:Yeasts