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Effects of substrate concentration on growth and lactic acid production by mixed cultures of Lactobacillus bulgaricus and Streptococcus thermophilus
Author(s) -
Özen Sevgi,
Özilgen Mustafa
Publication year - 1992
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280540111
Subject(s) - streptococcus thermophilus , lactobacillus , lactic acid , substrate (aquarium) , food science , bacteria , chemistry , kinetics , streptococcus , microbiology and biotechnology , bacterial growth , biochemistry , biology , fermentation , ecology , physics , quantum mechanics , genetics
Abstract The kinetics of growth and lactic acid production by mixed cultures of Lactobacillus bulgaricus and Streptococcus thermophilus were modeled with a set of modified logistic and Luedeking‐Piret equations. The specific growth rates and the inhibitory effect of each individual species on the mixed culture growth were found to be determined by the media composition. The kinetic analysis clearly showed that the contribution of each microbial species to the mixed culture growth process changed drastically when the substrate concentration was about 15%. This optimum initial substrate concentration was in agreement with the results of the previous studies and the optimum found by trial and error procedure in commercial yogurt production.