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Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Ancient Mesopotamian bakers maintained a mixed culture of wild yeast and lactic acid bacteria in a wheat‑barley starter that fermented at ambient temperatures to leaven and preserve bread.
Origin: Sumerians (c. 3500–3000 BCE) — Mesopotamia
See full technique reference →The yeast (likely *Saccharomyces cerevisiae* or *Candida milleri*) metabolized fermentable sugars to ethanol and CO₂, while lactic acid bacteria (e.g., *Lactobacillus sanfranciscensis*, *Leuconostoc* spp.) produced lactic and acetic acids, lowering the pH to 3.5–4.5. This acidic milieu inhibited spoilage microbes and contributed to the bread’s flavor and crumb structure.
Primary Reaction
Fermentation of starches to ethanol, CO₂, lactic acid, and acetic acid
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