What is the main fermentation product of Lactobacillus delbrueckii?

Lactobacillus delbrueckii is a species of lactic acid bacteria primarily involved in the fermentation of carbohydrates to produce lactic acid. This process is known as lactic acid fermentation, which occurs in anaerobic environments where oxygen is limited. The fermentation by Lactobacillus delbrueckii leads to the accumulation of lactic acid as the main metabolic end product. This characteristic is fundamental in various applications, such as in the production of yogurt and other fermented dairy products, where the tangy flavor and preservation effects are derived from the lactic acid produced.

The other substances mentioned, such as ethanol, acetic acid, and propionic acid, are associated with different fermentation processes and organisms. Ethanol is primarily produced by yeast fermentation during alcoholic fermentation, acetic acid is typically produced by acetic acid bacteria, and propionic acid is notably produced by certain bacteria involved in Swiss cheese production. Thus, when considering the specific metabolism of Lactobacillus delbrueckii, lactic acid stands out as the primary product.