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Advanced Cicerone® · Beer Flavor and Evaluation

Aldehydes

Syllabus Path

Acetaldehyde is commonly perceived as green apple, raw pumpkin, latex paint, or fresh-cut grass and can indicate young beer, stressed yeast, or oxygen-related staling. Name the specific aldehyde impression and decide whether it points to incomplete maturation, oxidation, or acceptable age character.

  1. III. Beer Flavor and Evaluation
  2. C. Specific beer flavor compounds
  3. 1. Aldehydes

Exam Focus

  • Explain aldehydes as a sensory evaluation topic within Specific beer flavor compounds.
  • Differentiate green-apple-like acetaldehyde from other aldehydic, fruity, grassy, or oxidation-related impressions using context and corroborating evidence.
  • Trace aldehyde formation and reduction through fermentation and aging, then rank plausible process or packaging sources without asserting a single cause.

Core knowledge

  • Acetaldehyde is commonly perceived as green apple, raw pumpkin, latex paint, or fresh-cut grass and can indicate young beer, stressed yeast, or oxygen-related staling.
  • Staling aldehydes such as trans-2-nonenal can read as papery or wet cardboard; sherry-like aldehyde notes may be acceptable in some aged strong beers.
  • Evaluate aldehydes by descriptor and context because youthful fermentation character and oxidative age can both sit in this family.

Study application

Name the specific aldehyde impression and decide whether it points to incomplete maturation, oxidation, or acceptable age character.

Key Terms

Acetaldehyde
Acetaldehyde is commonly perceived as green apple, raw pumpkin, latex paint, or fresh-cut grass and can indicate young beer, stressed yeast, or oxygen-related staling.
Staling aldehydes such as trans-2-nonenal
Staling aldehydes such as trans-2-nonenal can read as papery or wet cardboard; sherry-like aldehyde notes may be acceptable in some aged strong beers.

References

2 available