Autolysis in Champagne is the gradual breakdown of what and what notes does it contribute?

• A. Gradual breakdown of yeast, desirable in sparkling wine production. Yeast settles out of the solution and decomposes, contributing biscuity, brioche-y notes typical of champagne's bouquet. The most active time of autolysis is 18 months-4 years after fermentation.
• B. Immediate decomposition of grapes after fermentation
• C. Bacterial breakdown causing faults
• D. Oxygen exposure causing browning

Answer: (A)

Autolysis is the breakdown of yeast cells during aging on their lees in Champagne. As the spent yeast degrades, enzymes release compounds such as amino acids, peptides, and aroma molecules that create the characteristic autolytic aromas. In Champagne, these contribute aromas like biscuit and brioche, sometimes with toast and nutty accents, adding depth to the bouquet. This process develops gradually and is most noticeable after extended lees aging, typically many months to a few years—often cited as around 18 months up to 4 years after fermentation. It’s specifically about yeast breakdown, not grape decay, bacterial faults, or oxidation, which is why this option best describes autolysis and its notes.