Influence of controlled pH and temperature on the growth and acidification of pure cultures of Streptococcus thermophilus 404 and Lactobacillus bulgaricus 398
1989
Beal, C. | Louvet, P. | Corrieu, G.
The effect of pH and temperature on the growth and acidification characteristics of Streptococcus thermophilus 404 and Lactobacillus bulgaricus 398 were studied in order to optimize starter production. A quadratic two-variable model for each of these parameters is proposed. Optimal growth conditions were found at pH 6.5 and 40 degrees C for S. thermophilus and pH 5.8 and 44 degrees C for L. bulgaricus. Maximum acidification was obtained at pH values and temperatures higher than the optimal growth conditions. In addition, the two strains were generally more sensitive to pH effect.
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