PMID: 8586282Dec 15, 1995Paper

The importance of surface charge and hydrophobicity for the flocculation of chain-forming brewing yeast strains and resistance of these parameters to acid washing

FEMS Microbiology Letters
K L Wilcocks, Katherine A Smart

Abstract

The cell surface charge and hydrophobicity of the brewing yeast cell surface influences flocculation. Physiological stress, such as starvation, affects the capacity of some strains to flocculate due to the reorganisation of the cell wall and the modification of the surface physical properties. On completion of a brewery fermentation, yeast is removed from the beer, stored and inoculated (repitched) into a subsequent fermentation. Prior to repitching, brewing yeast slurries may be acid washed to remove any contaminating bacteria. This treatment has been shown to cause yeast cell surface "blistering". Acid washing treatment was used to examine the susceptibility of the physical properties of two chain-forming brewing yeast strains to stress. Although acid-washing affected the cell surface charge and hydrophobicity in both strains, the flocculation response was strain dependant. It is suggested that surface charge and the non-separation of progeny from mother cells rather than hydrophobicity influences the flocculation of chain-forming brewing yeast.

References

Apr 1, 1975·Canadian Journal of Microbiology·A W DayG G Stewart
Dec 1, 1989·Canadian Journal of Microbiology·B F JohnsonG B Calleja
Jun 1, 1988·Yeast·M Stratford, M H Keenan

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Citations

Oct 20, 2005·Journal of Bioscience and Bioengineering·A J ToughR A Herbert
May 11, 2010·International Journal of Food Microbiology·Stefania VichiSusana Buxaderas
Dec 11, 2014·Chemical Communications : Chem Comm·Ji Hun ParkSung Ho Yang
Apr 17, 2003·Applied Microbiology and Biotechnology·K J VerstrepenF R Delvaux
Nov 21, 2007·Applied Biochemistry and Biotechnology·Silvio S SilvaJuliana Polizel
Oct 31, 2018·Journal of Fungi·Ronnie G Willaert
Nov 16, 2019·Applied Microbiology and Biotechnology·Dorota CierniakŁukasz Chrzanowski

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