Lactobacillus delbrueckii subsp. bulgaricus

A thermophilic lactic acid bacterium used with Streptococcus thermophilus to ferment milk into yogurt. It produces lactic acid and contributes to yogurt’s characteristic texture and flavor.

Streptococcus thermophilus: A thermophilic lactic acid bacterium widely used as a starter culture in yogurt production. It grows alongside this bacterium, exchanging nutrients and accelerating milk fermentation.
Yogurt: A fermented milk food produced by bacterial cultures that acidify and thicken milk. This bacterium is one of the defining starter organisms used to make it.
Lactobacillus: A historically broad bacterial genus whose species are rod-shaped and commonly produce lactic acid. The organism’s traditional name places it in this familiar group of lactic acid bacteria.
Stamen Grigorov: A Bulgarian physician and microbiologist who identified the bacterium associated with yogurt in 1905. His work linked this bacterium to Bulgarian yogurt and gave it its original species name.
Lactic acid fermentation: A metabolic process that converts sugars into lactic acid, regenerating NAD⁺ without oxygen. This is the central energy-producing route by which the bacterium acidifies milk.
Yogurt starter culture: A microbial culture added to milk to initiate controlled fermentation into yogurt. It is commonly combined with Streptococcus thermophilus in the standard yogurt starter.
Bacterial taxonomy: The classification and naming of bacteria based on evolutionary relationships and shared traits. Its subspecies name reflects a formal rank within bacterial classification.
Lactobacillus delbrueckii: A bacterial species that includes several subspecies used in fermented foods. The yogurt organism is classified as one subspecies within this species.
Lactose: A disaccharide sugar composed of glucose and galactose, abundant in mammalian milk. The bacterium metabolizes this milk sugar during yogurt fermentation.
Thermophilic fermentation: Fermentation carried out by microorganisms that grow best at elevated temperatures. Yogurt production uses warm incubation suited to this bacterium’s growth.

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