Non-dairy lactic fermentations: the cereal world

Area of Science:

• Food Microbiology
• Fermentation Science
• Applied Microbiology

Background:

• Sourdough fermentation is a primary method for cereal processing globally.
• Lactobacilli, particularly Lactobacillus sanfranciscensis, Lactobacillus reuteri, and Lactobacillus pontis, are key microorganisms in sourdough.
• Understanding these bacteria is crucial for optimizing sourdough production and exploring their functional traits.

Purpose of the Study:

• To investigate the molecular biology and metabolism of key lactobacilli in sourdough.
• To identify specific genes involved in sugar metabolism in Lactobacillus sanfranciscensis.
• To explore unique properties of sourdough lactobacilli, such as antimicrobial production and gut cell adhesion.

Main Methods:

• Isolation and identification of lactobacilli from various sourdough fermentations.
• Application of molecular biology tools for strain monitoring.
• Cloning and characterization of key metabolic genes from Lactobacillus sanfranciscensis.

Main Results:

• Identification of Lactobacillus sanfranciscensis, L. reuteri, and L. pontis as dominant species.
• Elucidation of sugar degradation pathways through gene cloning in L. sanfranciscensis.
• Discovery of strains producing antagonistic compounds and exhibiting adhesion to human intestinal cells.

Conclusions:

• Molecular tools enable effective monitoring of sourdough fermentation processes.
• Understanding lactobacilli metabolism explains their prevalence and interactions.
• Certain sourdough lactobacilli strains possess valuable properties for food applications and potential probiotic use.