# Lactobacillus delbrueckii: A Functional Powerhouse in Dairy Fermentation and Emerging Probiotic Applications

## TL;DR

Lactobacillus delbrueckii is a powerful dairy fermenting bacterium with potential health benefits and applications in functional foods.

## Contribution

This review highlights L. delbrueckii's novel roles in precision fermentation and functional food development.

## Key findings

- L. delbrueckii produces bioactive peptides and EPS with antioxidant and anti-inflammatory effects.
- It contributes to gut health, cholesterol reduction, and potential anti-cancer activity.
- Its metabolic properties improve texture, flavor, and nutritional quality of fermented dairy products.

## Abstract

Lactobacillus delbrueckii
is a key lactic acid bacterium (LAB) widely used in dairy fermentation, particularly in the production of yogurt, cheese, and kefir. Its metabolic activities—such as efficient lactose utilization, rapid acidification, and high proteolytic activity—make it an indispensable starter culture in the dairy industry. Beyond its technological advantages,
L. delbrueckii
contributes significantly to human health through the production of bioactive peptides (BAPs), extracellular polysaccharides (EPS), and other functional metabolites with antioxidant, anti‐inflammatory, and immunomodulatory effects. Recent studies have also highlighted its role in gut health, cholesterol reduction, and potential anti‐cancer activity, underscoring its value as a probiotic. This review provides a comprehensive overview of the taxonomy, metabolism, and health‐promoting properties of
L. delbrueckii
while also exploring its potential applications in precision fermentation and the development of functional foods. The insights discussed herein position
L. delbrueckii
as a promising candidate for next‐generation probiotic dairy innovations.

Lactobacillus delbrueckii
is a key lactic acid bacterium widely used in dairy fermentation, particularly in yogurt and cheese production. This graphical abstract highlights its technological roles in lactose metabolism, acidification, proteolysis, and exopolysaccharide (EPS) production, which contribute to improved texture, flavor, and nutritional quality of fermented dairy products. In addition, fermentation‐derived metabolites, including bioactive peptides and EPS, are associated with gut health, immune modulation, and emerging functional food applications.