Thermophilic bacterial fermentation of skim milk producing a dense, acidic yogurt with high protein retention.
Technical
Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus convert lactose into lactic acid at 40-45°C, causing casein micelle aggregation while whey proteins remain soluble. The strained process removes liquid whey, concentrating proteins and creating a thick gel structure.
Culinary Significance
Produces a yogurt with 10-12% protein content (3-4× regular yogurt) and clean acidic flavor, used as both staple food and cooking ingredient.
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Primary Reaction
C12H22O11 (lactose) + H2O → 4 CH3CHOHCOOH (lactic acid)
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Molecular Events
Key Variables
Failure Modes
Weak gel formation
Cause: Insufficient acid production (<0.7% lactic acid)
Visual: Runny consistency
Fix: Extend fermentation time or increase culture dosage
Grainy texture
Cause: Overacidification (>1.2% lactic acid)
Visual: Syneresis (whey separation)
Fix: Reduce fermentation time by 1-2 hours
Temperature
43°C optimal
38°C – 46°C range
Time
18 hours
12 hours – 24 hours
Equipment
Aroma ()
Compounds: diacetyl, acetaldehyde, 2,3-pentanedione, acetic acid, butyric acid
Taste
Texture
Wine Analogy
Like a high-acid Chablis with lees aging
Coffee Analogy
Cold brew concentrate mouthfeel
Civilization
Norse/Viking
Era
9th century
Region
Iceland
Spread Path
Scandinavian colonization → Modern dairy globalization
Ingredient Affinities
Key Compounds Produced
Pairing Affinities
Smoked salmon — shared: 3-methylbutanal (umami enhancer)
Lingonberry — shared: Quinic acid (synergistic acidity)
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French carbon steel — lighter than cast iron, seasons like a wok
1000+ recipes from every Indian state — the definitive reference
Italy's definitive home cookbook — 2,000 recipes, every region
Precision bread baking — detailed formulas, troubleshooting
The all-in-one American cooking reference — every technique covered
As an Amazon Associate, Foodgeist earns from qualifying purchases.
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