A Wild Yeast Laboratory Activity: From Isolation to Brewing

Area of Science:

• Microbiology
• Molecular Ecology
• Biotechnology

Background:

• Microbial fermentation is a vital metabolic process with extensive industrial and culinary applications.
• Fermented beverages have a long history, and wild yeasts are gaining interest for unique brewing characteristics.
• Understanding yeast ecology and genetics is crucial for optimizing fermentation processes.

Purpose of the Study:

• To describe a guided inquiry-based laboratory course integrating yeast molecular ecology and brewing.
• To compare domesticated Saccharomyces cerevisiae strains with wild yeast for brewing potential.
• To enhance student understanding of microbiology through real-world applications.

Main Methods:

• Students isolated and identified wild yeast strains.
• Phenotypic characterization of wild and commercial ale yeast strains was performed.
• A brewing recipe was scientifically designed and compared using commercial and wild yeast strains.

Main Results:

• The course successfully integrated yeast molecular ecology and brewing principles.
• Students demonstrated significant learning gains in course objectives through pre- and postassessments.
• The curriculum provided a relevant and accessible platform for students to connect microbiology to practical applications.

Conclusions:

• The developed laboratory course effectively teaches yeast molecular ecology and brewing.
• Comparing wild and commercial yeast strains offers valuable insights into brewing science.
• Inquiry-based learning in this context enhances student engagement and comprehension of microbiology.