Abstract
Yeasts present in Camembert and Brie cheeses during processing were monitored in a single cheese factory during summer and winter, to determine the seasonal diversity of yeasts over a ripening period of 56 days. Lactic acid bacteria predominate during cheese making, but yeasts play a significant role during maturation reaching counts of 6 log units at the later stages of ripening. Sources of yeast contamination that may lead to contamination of the curd were also determined. A diverse variety of 20 yeast species representing 10 genera were present during the winter period associated with the factory environment, during processing and ripening, whereas only seven yeast species representing six genera were isolated during summer. Although a broad spectrum of yeasts was isolated from both cheeses, Debaryomyces hansenii and Yarrowia lipolytica were the most abundant yeast species isolated. Other species encountered were Torulaspora delbrueckii, Rhodotorula mucilaginosa, Rhodotorula minuta and various species of Candida.
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