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For optimal expression of varietal red thiols in wines

Red thiols in wine, what do we talk about?

Varietal red thiols are:

Raisen

Present in the grapes as odorless precursors (bound to glutathione and cystein)

Ban

Revealed by the yeast through enzymatic action during alcoholic fermentation

scissors

The β-lyase is the enzyme related to the release
of volatile thiols, from odorless thiol precursors

There are 3 main volatile thiols in red grapes with a significant impact on the sensorial profile of red wines:

aromas

4MMP, 3MH, 3MH-A

Their influence in red wines is very different from the one they have in white.

Are all yeasts equal in their ability to reveal thiols?

There is a wide variability between yeast strains, due to their intrinsic beta-lyase activity modulated by the IRC7 gene expression.

Aroma
precursor Beta-Lyase scissors green

Thiols
Release
of aromas

IRC7 dnk

IRC7 gene (like every gene) possesses 2 alleles which exist in two versions:

LONG FORM IRC7L

Higher

beta-lyase expression

colba colba

IRC7L
Long

colba2 colba2

IRC7L
Long

SHORT FORM IRC7S

Not fully

functional beta-lyase

colba colba

IRC7S
Short

colba2 colba2

IRC7L
Long

Fleche

Only 17% of all yeasts have double alleles in their long form (IRC7L)

And there are also 2 different versions of IRC7 whatever the allele length (short or long): an original version and an altered one.

Fleche green

Only 20% of wine yeasts have the ORIGINAL version of IRC7

Original

schema-1
Original
altered

Up to 80% less thiol release compared to original version

Altered

schema-2
altered

Up to 80% less thiol release compared to original version

Only 3% of all wine yeasts own both features.*

RUBY™ is one of them and is the first wine yeast specifically selected to release red thiols in red wines.

Product
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chart 2

RUBY™ IS A MAJOR INNOVATION IN THE SELECTION OF WINE YEASTS AND OPENS UP EXCITING PROSPECTS FOR THE MANAGEMENT OF RED WINEMAKING, BRINGING RED WINES TO ANOTHER SENSORIAL DIMENSION.

 

 

 

 

 

*SAUVY™, a wine yeast produced by Lallemand Oenology, and suited for white wines, also owns both features. Discover SAUVY™

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