Description
Microbial conversion of rye carbohydrates producing distinct sour flavors and improved digestibility.
Technical
Lactic acid bacteria (LAB) and wild yeasts metabolize pentosans and arabinoxylans in rye flour, creating lactic/acetic acids and CO2. Lower pH (3.8-4.5) inhibits spoilage organisms while fostering protease activity.
Culinary Significance
Essential for developing the characteristic tangy flavor and moist crumb structure in rye breads, while enabling fermentation where wheat yeasts struggle.
Science
Primary Reaction
Lactic acid fermentation
Parameters
Temperature
24°C optimal
18°C to 32°C range
Time
18-24 hours
12 hours – 36 hours
Equipment
Stone milling for whole grain retentionWooden fermentation vessels (traditional)pH meter for precision brewing