GENERAL MICROBIOLOGY - T.P. Pyrog - 2004

14. TYPES OF FERMENTATION

14.3. LACTIC ACID FERMENTATION AND THE FAMILY LACTOBACILLACEAE

14.3.2. Homofermentative lactic acid fermentation

Homofermentative lactic acid Bacteria produce exclusively lactic acid (accounting for at least 90% of all Fermentation products). Glucose is catabolized via The Glycolytic Pathway. Hydrogen released during the dehydrogenation of glyceraldehyde-3-phosphate as NADH is transferred to Pyruvate (Fig. 14.3). In the presence of Lactate dehydrogenase, pyruvate is reduced to lactate. Only a minor fraction of pyruvate undergoes decarboxylation to form acetic acid, ethanol, CO2, and acetoin. Homofermentative Lactic acid fermentation is carried out by streptococci, and among lactobacilli, by Lactobacillus lactis, L. bulgaricus, L. delbruckii, and L. acidophilus.

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Fig. 14.3. Lactic acid fermentation



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