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Behaviour of Saccharomyces cerevisiae wine strains during adaptation to unfavourable conditions of fermentation on synthetic medium: cell lipid composition, membrane integrity, viability and fermentative activity

Mannazzu, Ilaria Maria and Angelozzi, Daniele and Belviso, Simona and Budroni, Marilena and Farris, Giovanni Antonio and Goffrini, Paola and Lodi, Tiziana and Marzona, Mario and Bardi, Laura (2008) Behaviour of Saccharomyces cerevisiae wine strains during adaptation to unfavourable conditions of fermentation on synthetic medium: cell lipid composition, membrane integrity, viability and fermentative activity. International Journal of Food Microbiology, Vol. 121 (1), p. 84-91. ISSN 0168-1605. Article.

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DOI: 10.1016/j.ijfoodmicro.2007.11.003

Abstract

During must fermentation wine strains are exposed to a variety of biotic and abiotic stresses which, when prevailing over the cellular defence systems, can affect cell viability with negative consequences on the progression of the fermentative process. To investigate the ability of wine strains to survive and adapt to unfavourable conditions of fermentation, the lipid composition, membrane integrity, cell viability and fermentative activity of three strains of Saccharomyces cerevisiae were analysed during hypoxic growth in a sugar-rich medium lacking lipid nutrients. These are stressful conditions, not unusual during must fermentation, which, by affecting lipid biosynthesis may exert a negative effect on yeast viability. The results obtained showed that the three strains were able to modulate cell lipid composition during fermentation. However, only two of them, which showed highest viability and membrane integrity at the end of the fermentation process, reached a fatty acid composition which seemed to be optimal for a successful adaptation. In particular, C16/TFA and UFA/TFA ratios, more than total lipid and ergosterol contents, seem to be involved in yeast adaptation.

Item Type:Article
ID Code:3810
Status:Published
Refereed:Yes
Uncontrolled Keywords:Wine yeast, Saccharomyces cerevisiae, viability, lipid composition, membrane integrity, fatty acids
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Elsevier
ISSN:0168-1605
Copyright Holders:© 2007 Elsevier
Deposited On:03 May 2010 16:53

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