EVOLUTION DES BIFIDOBACTERIES DANS LES CULTURES MIXTES AVEC STREPTOCOCCUS THERMOPHILUS ET LACTOBACILLUS HELVETICUS
BARASCU E. UNIVERSITÉ VALAHIA TARGOVISTE, FACULTÉ D’INGÉNIERIE D’ENVIRONNEMENT ET BIOTECHNOLOGIES, 18-24 RUE UNIRII, ELBARASCU72@MAIL.COM, ELENABARASCU@VALAHIA.RO
In this study was monitored growth of bifidobacteria in single or mixed cultures with Streptococcus thermophilus and Lactobacillus helveticus with the purpose of fructification the results in the technology of probiotic dairy products. The cultures used in this experiment were inoculated in different proportion in the base medium (milk reconstituted with 12.4% nonfat dry matter) and for diversification the studied variants and the cultivation conditions was used both simultaneous inoculation of the cultures and inoculation with Streptococcus thermophilus and Lactobacillus helveticus after 4 hours from inoculation of bifidobacteria. Concerning the growth of bifidobacteria in mixed cultures with Streptococcus thermophilus and Lactobacillus helveticus was acceptable only in variants with simultaneous inoculation, when the number of cells was greater than the variant with single culture. In consequence, the association of cultures in report of 4:1:1 (bifidobacteria: Streptococcus thermophilus: Lactocillus helveticus) results in obtaining a considerable number of the bifidobacteria(1.13x109 cfu/cm3) after only 6 hours of optimal incubation for this bacteria.
