Torulaspora delbrueckii produces high levels of C5 and C6 polyols during wine fermentations.

Abstract:

:Non-Saccharomyces yeasts impact wine fermentations and can diversify the flavor profiles of wines. However, little information is available on the metabolic networks of most of these species. Here we show that unlike the main wine yeast Saccharomyces cerevisiae, Torulaspora delbrueckii and to a lesser extent Lachancea thermotolerans produce significant concentrations of C5 and C6 polyols under wine fermentation conditions. In particular, D-arabitol, D-sorbitol and D-mannitol were produced at significant levels. Their release into the extracellular matrix started when that of glycerol ceased. The data also show that polyol production is influenced by initial sugar concentration, repressed by acetic acid and induced in ethanol supplemented media. Moreover, unlike glycerol and sorbitol, mannitol was partially re-assimilated when populations started to decline. The findings suggest that polyol synthesis is a physiological adaptation to stressful conditions characteristic of alcoholic fermentation and that these polyols may serve a similar purpose as glycerol production in S. cerevisiae, including osmoadaptation and redox balancing.

journal_name

FEMS Yeast Res

journal_title

FEMS yeast research

authors

Mbuyane LL,de Kock M,Bauer FF,Divol B

doi

10.1093/femsyr/foy084

subject

Has Abstract

pub_date

2018-11-01 00:00:00

issue

7

eissn

1567-1356

issn

1567-1364

pii

5061120

journal_volume

18

pub_type

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