What You Need to Know
Levain maintains a symbiotic culture of Saccharomyces exiguus and various Lactobacillus species (L. sanfranciscensis, L. brevis) that produce CO2, ethanol, and organic acids through heterofermentative metabolism.
Provides superior oven spring, complex flavor profiles, and extended shelf life compared to commercial yeast breads.
Key Parameters
Temperature
22°C
15°C - 28°C
Time
12 hours
5 hours - 36 hours
Equipment
Glass or food-grade plastic containerDigital scale (0.1g precision)Stiff spatulaBreathable cover (cheesecloth)
Steps
- 1.
Pain au Levain (Boulangeries of Paris): Creates open crumb and caramelized crust
- 2.
Miche Poilâne-style (Boulangerie Poilâne): Enables 2kg loaves with 36-hour fermentation
The Science
Primary Reaction
C6H12O6 → 2C2H5OH + 2CO2 (ethanol fermentation)