Biocompatibilité des bactéries lactiques et probiotiques et d'affinage avec des mycètes du camembert isolées de laits de terroir québécois

Authors: Champigny, Pierre-Luc
Advisor: Fliss, IsmaïlChampagne, Claude P.
Abstract: This study was carried out to verify the biocompatibility between the mycetes of Camembert cheese and lactic cultures (probiotic and ripening strains). Most of the fungi strains used had been isolated from different milk sources over the province of Quebec (Canada) and two different kinds of milk were used to produce cheese slurries. Automated spectrophotometry (AS) was employed to screen some biocompatible pairings of mycete and bacterial strains. A milk medium was fermented by yeasts and moulds and then inoculated with bacteria. The previous growth of the mycetes was sometimes stimulatory and sometimes inhibitory, but the effects were minor and varied as a function of the strains. Subsequently, to confirm these AS results, cheese slurries were inoculated simultaneously with different strains combinations. Finally, pilot scale Camembert cheese was produced to verify its ability to support probiotic bacterial cultures viability. The absence of inhibition of the bacteria by the mycetes in SA was confirmed, but the interactions in the cheese slurries differed from those noted in AS because of the different pH patterns in the two experimental series. Camembert was shown to have potential to favour the viability of probiotic bacterial strains during ripening and storage. However, no mycete mix was systematically better than another to stimulate this viability.
Document Type: Mémoire de maîtrise
Issue Date: 2011
Open Access Date: 18 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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