| Wine yeast strains are one of the most important factors shaping a wine's aroma, flavor, texture, alcohol level, and fermentation performance. Most commercial winemaking uses strains of Saccharomyces cerevisiae, though other yeasts can play a role as well. |
Why yeast matters
During fermentation, yeast converts sugars into alcohol, carbon dioxide, and hundreds of flavor compounds. Different strains can influence:
Fruit character (citrus, tropical fruit, stone fruit, berry notes), Floral aromas, Spice and herbaceous qualities, Mouthfeel and texture, Alcohol tolerance, Fermentation speed, Production of glycerol, esters, and other aroma compounds.
The same grape variety fermented with different yeast strains can produce noticeably different wines, even when all other winemaking conditions are kept the same. |
Common commercial wine yeast strains
EC-1118
Originally isolated from Champagne fermentations.
Characteristics:
Very reliable fermenter, High alcohol tolerance (up to ~18%), Neutral flavor profile, Excellent for restarting stuck fermentations
Typical use: Sparkling wines, Fruit wines, Difficult fermentations
D47
A popular strain for white wines.
Characteristics:
Enhances mouthfeel, Produces honey and floral notes, Moderate fermentation speed, Performs best at cooler temperatures.
Typical use: Chardonnay, Viognier, Mead
QA23
Developed in Portugal.
Characteristics:
Strong tropical and citrus aromas, Good cold-temperature fermentation, Preserves freshness.
Typical use: Sauvignon Blanc, Aromatic white wines
RC-212
Associated with red wine production.
Characteristics:
Enhances color stability, Promotes berry and spicy aromas, Good extraction of phenolics.
Typical use: Pinot Noir, Syrah, Other premium reds
BM4x4
A blend of multiple yeast strains.
Characteristics:
High complexity, Increased mouthfeel, Enhanced fruit expression.
Typical use: Rich red wines, Complex blends
71B
Originally selected in France.
Characteristics:
Can metabolize some malic acid, Produces fruity esters, Softens acidity
Typical use: Rosé wines, Young red wines, Fruit wines |
Wild vs. cultured yeast
Wild (native) fermentation
Uses naturally occurring yeasts found on grapes and in the winery.
Advantages:
Potentially greater complexity, Strong expression of vineyard character
Disadvantages:
Less predictable, Higher risk of stuck fermentation, Greater variation between batches
Common non-Saccharomyces yeasts involved early in wild fermentations include:
Hanseniaspora uvarum, Metschnikowia pulcherrima, Torulaspora delbrueckii.
These often start fermentation before being overtaken by Saccharomyces cerevisiae as alcohol levels rise.
Cultured yeast
Commercial strains are selected for:
Predictable fermentation, Desired flavor profiles, Alcohol tolerance, Low production of off-flavors
Most modern wineries use cultured yeast, either alone or after a short period of native fermentation. |
Yeast selection by wine style.
Sparkling wine, EC-1118
Sauvignon Blanc, QA23, VIN13
Chardonnay, D47, CY3079
Pinot Noir, RC-212, D254
Syrah/Shiraz, RC-212, BM4x4
Rosé, 71B, QA23
Fruit wine, EC-1118, 71B
Mead, D47, 71B |
Beyond Saccharomyces
Modern winemakers increasingly use mixed cultures that include non-Saccharomyces species to create distinctive wines. For example:
Torulaspora delbrueckii can increase complexity and mouthfeel.
Metschnikowia pulcherrima may enhance fruity aromas.
Lachancea thermotolerans can increase acidity through lactic acid production.
These are often inoculated first and followed later by Saccharomyces cerevisiae to complete fermentation. |
A useful rule of thumb
For beginners:
EC-1118 = reliability.
71B = fruity wines and softer acidity.
D47 = fuller-bodied whites and mead.
QA23 = aromatic whites.
RC-212 = expressive red wines. |
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