Autolysis: Difference between revisions
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== Definition and mechanism == | == Definition and mechanism == | ||
Autolysis occurs after alcoholic fermentation, when yeast cells die and their cellular membranes begin to break down due to enzymatic activity. Intracellular enzymes degrade structural components of the yeast, releasing compounds into the surrounding wine. | [[Autolysis]] occurs after alcoholic fermentation, when yeast cells die and their cellular membranes begin to break down due to enzymatic activity. Intracellular enzymes degrade structural components of the yeast, releasing compounds into the surrounding wine. | ||
Key compounds released during autolysis include: | Key compounds released during autolysis include: | ||
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== Role in winemaking == | == Role in winemaking == | ||
Autolysis is most closely associated with traditional method sparkling wines such as Champagne, where wines are aged for extended periods on lees following secondary fermentation in bottle. | Autolysis is most closely associated with traditional method sparkling wines such as [[Champagne]], where wines are aged for extended periods on lees following secondary fermentation in bottle. | ||
During this ageing process: | During this ageing process: | ||
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The process requires prolonged contact between wine and lees, often for several years in premium sparkling wines.<ref>Feuillat, M.; Charpentier, C., “Autolysis of Yeasts in Champagne”, ''American Journal of Enology and Viticulture'', 1982.</ref> | The process requires prolonged contact between wine and lees, often for several years in premium sparkling wines.<ref>Feuillat, M.; Charpentier, C., “Autolysis of Yeasts in Champagne”, ''American Journal of Enology and Viticulture'', 1982.</ref> | ||
In still wines, autolysis may occur during ''sur lie'' ageing, particularly in white wines such as Muscadet or certain styles of Chardonnay. | In still wines, autolysis may occur during ''sur lie'' ageing, particularly in white wines such as [[Muscadet]] or certain styles of [[Chardonnay]]. | ||
== Sensory impact == | == Sensory impact == | ||
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Autolysis contributes a range of characteristic sensory attributes: | Autolysis contributes a range of characteristic sensory attributes: | ||
* Aromas of bread, brioche and toasted pastry | * [[Aromas]] of bread, brioche and toasted pastry | ||
* Increased body and creaminess on the palate | * Increased body and creaminess on the palate | ||
* Enhanced integration of acidity and structure | * Enhanced integration of acidity and structure | ||
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* ''Autolysis'' is the biochemical process that occurs within those cells over time | * ''Autolysis'' is the biochemical process that occurs within those cells over time | ||
Lees ageing creates the conditions necessary for autolysis, but the extent of autolytic impact depends on duration and winemaking choices such as bâtonnage (lees stirring).<ref>Maryland Wine Compass, “Autolysis: A closer look”.</ref> | [[Lees ageing]] creates the conditions necessary for autolysis, but the extent of autolytic impact depends on duration and winemaking choices such as bâtonnage (lees stirring).<ref>Maryland Wine Compass, “Autolysis: A closer look”.</ref> | ||
== Factors influencing autolysis == | == Factors influencing autolysis == | ||
Latest revision as of 00:00, 10 April 2026
Autolysis is a biochemical process in winemaking in which dead yeast cells (lees) undergo enzymatic self-digestion, releasing intracellular compounds such as amino acids, polysaccharides and proteins into the wine. This process is particularly significant in sparkling wine production and in wines aged on lees, where it contributes to texture, stability and aromatic complexity.[1]
Definition and mechanism
Autolysis occurs after alcoholic fermentation, when yeast cells die and their cellular membranes begin to break down due to enzymatic activity. Intracellular enzymes degrade structural components of the yeast, releasing compounds into the surrounding wine.
Key compounds released during autolysis include:
- Amino acids and peptides
- Mannoproteins and polysaccharides
- Fatty acids and nucleotides
These substances influence both the chemical composition and sensory profile of the wine.[2]
The rate and extent of autolysis depend on several factors, including temperature, pH, alcohol level and duration of lees contact.[3]
Role in winemaking
Autolysis is most closely associated with traditional method sparkling wines such as Champagne, where wines are aged for extended periods on lees following secondary fermentation in bottle.
During this ageing process:
- Yeast cells gradually break down over months or years
- Released mannoproteins enhance mouthfeel and foam stability
- Amino acids contribute to flavour development and complexity
The process requires prolonged contact between wine and lees, often for several years in premium sparkling wines.[4]
In still wines, autolysis may occur during sur lie ageing, particularly in white wines such as Muscadet or certain styles of Chardonnay.
Sensory impact
Autolysis contributes a range of characteristic sensory attributes:
- Aromas of bread, brioche and toasted pastry
- Increased body and creaminess on the palate
- Enhanced integration of acidity and structure
These effects are especially pronounced in long-aged sparkling wines, where autolytic character is considered a hallmark of quality.[5]
The release of polysaccharides also improves colloidal stability, reducing protein haze and contributing to a smoother mouthfeel.[6]
Autolysis vs ageing on lees
Although closely related, autolysis and ageing on lees are not identical concepts:
- Ageing on lees refers to the practice of leaving wine in contact with dead yeast cells
- Autolysis is the biochemical process that occurs within those cells over time
Lees ageing creates the conditions necessary for autolysis, but the extent of autolytic impact depends on duration and winemaking choices such as bâtonnage (lees stirring).[7]
Factors influencing autolysis
Several variables influence the progression of autolysis:
- Time: extended ageing increases compound release
- Temperature: higher temperatures accelerate enzymatic breakdown
- pH and alcohol: affect enzyme activity and cell stability
- Yeast strain: different strains vary in autolytic potential
Winemakers may manipulate these factors to control the intensity of autolytic character in the final wine.
See also
References
- ↑ PhD Jackson, Ronald S., Wine Science: Principles and Applications, Academic Press Inc, 14 April 2020. ISBN 9780128161180.
- ↑ Pascal Ribéreau-Gayon, Yves Glories, Alain Maujean, Denis Dubourdieu, & 1 more, Handbook of Enology, Volume 2: The Chemistry of Wine - Stabilization and Treatments, Wiley, 31 Mar. 2006. ISBN 9780470010372.
- ↑ Pons Mercadé, Pere, Yeasts autolysis on the manufacture of sparkling wines, Universitat Rovira i Virgili, 2021.
- ↑ Feuillat, M.; Charpentier, C., “Autolysis of Yeasts in Champagne”, American Journal of Enology and Viticulture, 1982.
- ↑ Marr, Bernard, “The Difference Between Autolysis And Aging On Lees”, bmwineguide.co.uk.
- ↑ Andrew L. Waterhouse, Understanding Wine Chemistry, Wiley, 19 Aug. 2016. ISBN 9781118627808.
- ↑ Maryland Wine Compass, “Autolysis: A closer look”.