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THE INCIDENCE AND SIGNIFICANCE OF WILD SACCHAROMYCES CONTAMINANTS IN THE BREWERY
Author(s) -
Richards M.
Publication year - 1968
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.1968.tb03155.x
Subject(s) - brewing , saccharomyces , yeast , contamination , saccharomyces cerevisiae , persistence (discontinuity) , food science , biology , fermentation , biochemistry , engineering , ecology , geotechnical engineering
The persistence of low levels of contamination by non‐brewing Saccharomyces through several batch fermentations establishes the immuno‐fluorescent method as a very sensitive procedure for estimating the microbiological purity of pitching yeasts. Trade return figures for draught beers show that in this brewery the principal cause for high rejection rates has, on several occasions, been contamination of pitching yeasts with “wild” Saccharomyces . The recommendation is made that pitching yeasts should be discarded when the level of infection achieves 100 cells of wild Saccharomyces per million cells of brewing yeast.