What is a sensory consequence of oxidation in beer?

What is a sensory consequence of oxidation in beer?

• A. Increased hop aroma.
• B. Cleaner, crisper finish.
• C. A grape-like estery note.
• D. Loss of hop aroma and stale, cardboard flavors.

Answer: (D)

Oxidation in beer alters its chemistry when oxygen interacts with lipids and volatile aroma compounds, causing aromas to fade and off-flavors to form. A hallmark sensory result is the loss of hop aroma accompanied by a stale, cardboard-like flavor, produced in part by aldehydes such as trans-2-nonenal that develop as fats oxidize. This makes the beer taste flat and aged rather than fresh and bright. So the best match is the description of reduced hop aroma with a stale, cardboard character. The other options don’t fit oxidation’s effects: oxidation does not add hop aroma; ester-derived grape-like notes come from fermentation, not oxygen exposure; and a cleaner, crisper finish is characteristic of freshness, not oxidized beer.

Oxidation in beer alters its chemistry when oxygen interacts with lipids and volatile aroma compounds, causing aromas to fade and off-flavors to form. A hallmark sensory result is the loss of hop aroma accompanied by a stale, cardboard-like flavor, produced in part by aldehydes such as trans-2-nonenal that develop as fats oxidize. This makes the beer taste flat and aged rather than fresh and bright. So the best match is the description of reduced hop aroma with a stale, cardboard character. The other options don’t fit oxidation’s effects: oxidation does not add hop aroma; ester-derived grape-like notes come from fermentation, not oxygen exposure; and a cleaner, crisper finish is characteristic of freshness, not oxidized beer.