What You Need to Know
During ambient fermentation (18–22 °C, 24–48 h) native lactic acid bacteria hydrolyze nixtamalized starch to glucose, which is metabolized to lactic acid, acetic acid, ethanol and CO₂. Amylolytic activity from resident molds (e.g., Aspergillus spp.) further saccharifies starch, enhancing flavor and reducing antinutrients. The resulting pH drop (3.5–4.0) improves digestibility and creates a characteristic sour aroma.
Steps
- 1.
Piki bread (Hopi people): Provides structural integrity for paper-thin sheets
- 2.
Chaquegüe (Zuni people): Base for fermented corn pudding
- 3.
Tepary bean tamales (Tohono O'odham): Sourness balances earthy bean filling
The Science
Primary Reaction
Starch → (amylolysis) → glucose → (heterofermentative LAB & yeasts) → lactic acid + acetic acid + ethanol + CO₂