Which aroma is associated with reduction?

Which aroma is associated with reduction?

• A. Nutty, caramelized
• B. Vinegar-like aromas
• C. Sulfurous, burnt matches, or rotten egg aromas
• D. Floral

Answer: (C)

Reduction aromas come from sulfur-containing compounds that build up when oxygen is scarce during fermentation or storage. The classic signs are sulfurous notes—burnt matches, rotten eggs—caused by hydrogen sulfide and related compounds. These off-aromas aren’t fruity or sweet; they reflect a redox imbalance and yeast stress under low oxygen. Nutty or caramelized scents come from malt chemistry and Maillard reactions, not reduction. Vinegar-like aromas indicate oxidation or bacterial activity, not reduction. Floral scents come from esters and hop compounds, also not reduction. So the sulfurous, burnt matches, or rotten egg aromas are the best match for reduction.

Reduction aromas come from sulfur-containing compounds that build up when oxygen is scarce during fermentation or storage. The classic signs are sulfurous notes—burnt matches, rotten eggs—caused by hydrogen sulfide and related compounds. These off-aromas aren’t fruity or sweet; they reflect a redox imbalance and yeast stress under low oxygen. Nutty or caramelized scents come from malt chemistry and Maillard reactions, not reduction. Vinegar-like aromas indicate oxidation or bacterial activity, not reduction. Floral scents come from esters and hop compounds, also not reduction. So the sulfurous, burnt matches, or rotten egg aromas are the best match for reduction.