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Craft beer production benefits from specific yeast combinations and late dry-hopping techniques, enhancing antioxidant capacity and polyphenol content. An electronic nose effectively differentiates beer types based on volatile compounds.

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Area of Science:

  • Food Science
  • Brewing Technology
  • Sensory Analysis

Background:

  • The craft beer market is expanding, with consumers seeking novel products.
  • Nine distinct craft beer treatments were explored, focusing on fermentation and dry-hopping methods.
  • Key quality attributes including polyphenols, antioxidants, bitterness, color, and alcohol content were assessed.

Purpose of the Study:

  • To investigate the impact of different fermentation and dry-hopping strategies on craft beer quality.
  • To evaluate the effectiveness of an electronic nose in distinguishing between various craft beer types.

Main Methods:

  • Pilot-scale production of nine craft beer variants.
  • Analysis of key beer quality parameters: polyphenols, antioxidants, bitterness (IBUs), color, and alcohol.
  • Application of an electronic nose coupled with Principal Component Analysis (PCA) for volatile compound analysis.

Main Results:

  • Warm-temperature dry hopping during maturation increased bitterness to 40 IBUs.
  • A combination of two yeast types and two fermentation temperatures yielded the highest antioxidant capacity (approx. 92%).
  • Late dry hopping with ale yeasts significantly boosted antioxidant activity. PCA explained 97% of the variability in volatile compounds.

Conclusions:

  • Combining ale and lager yeasts enhances beer's antioxidant capacity and polyphenol levels.
  • Late dry hopping is an effective method for increasing antioxidant activity.
  • Electronic nose technology provides a reliable means to differentiate beer based on its complex volatile profile.