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Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Traditional kefir and koumiss are symbiotic fermentations of cow/goat or mare’s milk by lactic bacteria and yeasts, producing lactic acid, ethanol, CO₂ and the exopolysaccharide kefiran.
Origin: North Caucasus peoples (Kurdish‑Turkic) and Central Asian nomadic herders (Kazakh, Kyrgyz, Mongol) (Traditional/ancient) — North Caucasus and Central Asian steppe
See full technique reference →During fermentation lactose is metabolized by lactobacilli to lactic acid and by yeasts to ethanol and CO₂. The co‑culture also synthesizes kefiran, a β‑1,4‑glucan that forms the grain matrix and contributes to viscosity. The process is pH‑driven, with acidification lowering pH to 3.8–4.5 and yeast activity peaking at moderate temperatures.
Primary Reaction
Fermentation of lactose to lactic acid, ethanol, CO₂, and synthesis of kefiran polysaccharide
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Key Variables