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Deciphering milk microflora and its contribution to cheese quality

Deciphering milk microflora and its contribution to cheese quality

Steve Labrie
Claude P. Champagne
Université Laval
  • Processing

Project summary

Cheese quality is influenced by complex factors, including natural milk microbiota, dairy production conditions and seasonal variations in milk composition. However, the main sources of natural microbiota, the effect of sanitizers on its composition, and its impact on cheese texture and ripening remain poorly understood.

This project aims to characterize the microbiological and chemical factors influencing cheese quality. The research team will study the dairy microbiota throughout the production chain, measure the effects of natural antimicrobial systems (lysozyme, lactoperoxidase) on proteolysis, and analyze the relationship between milk composition and cheese rheology.

The results could be used to optimize production practices and better understand the impact of microbiological and chemical parameters on cheese texture and quality.


Expected results

This research project could offer recommendations to producers and processors to improve cheese quality and authenticity. The results will help identify the role of the natural milk microbiota in the production of aromatic compounds and bacterial species that influence organoleptic qualities. Special attention will be given to microbial signatures associated with terroir, potentially supporting the addition of value-enhancing labels, such as designations of origin and specificity.

Researchers will also analyze the impact of demineralization and proteolysis on cheese texture during ripening, separating out their respective contributions. A comparative study of the properties of summer and winter milks will aim to explain seasonal variations and propose appropriate technological solutions.

Finally, natural antimicrobial systems (lactoperoxidase, lysozyme) will be studied to understand their effect on the refining microbiota. This knowledge could guide the standardization of milk in order to modulate this microbiota. This project, involving eight cheese dairies, will include cheddar and washed-rind types.


Main achievements

  • Training two master’s students and one doctoral student
  • Results presented at Colloque STELA, CEFQ Cheese Days and Novalait’s Forum Techno
  • Presentations and posters at national and international conferences (World Dairy Summit FIL-IDF, Cheese Symposium)
  • Writing scientific articles