Corked wine is most closely associated with which phenomenon?

• A. Oxidation
• B. Brett contamination
• C. Malolactic fermentation
• D. Cork taint (trichloroanisole)

Answer: (D)

Cork taint is the phenomenon behind a corked wine. It produces a musty, damp cardboard or moldy aroma and flavor that can ruin the wine even at very low levels. The culprit is trichloroanisole (TCA), which forms when chlorine-based sanitizers used in cork processing interact with mold precursors on the cork or in the environment and then diffuses into the wine. Because the sensory impact can be detected at tiny concentrations, many wines can taste corky even when the flaw is subtle.

This fault is distinct from oxidation, which comes from oxygen exposure and typically yields nutty, sherry-like, or browned characteristics. It’s also different from Brett contamination, which brings barnyard or medicinal notes due to wild yeast, and from malolactic fermentation, which is a deliberate secondary fermentation that can give buttery or creamy notes rather than a musty aroma. Cork taint is specifically tied to the cork and its interaction with compounds like TCA.