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Journal of Dairy Science Vol. 73 No. 6 1478-1484
© 1990 by American Dairy Science Association ®
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Uncoupling of Growth and Acids Production in Bifidobacterium ssp

Marie-Line Desjardins 1, Denis Roy 1, Christian Toupin 1, and Jacques Goulet 2

1 Food Research and Development Centre, Agriculture Canada, Québec, Canada J2S 8E3
2 Laval University, Québec, Canada G1K 7P4

Kinetics of batch cultivation of four species of Bifidobacterium in milk were examined in detail. Bifidobacteria could grow well in milk inoculated with cultures prepared in a synthetic medium. Cessation of growth occurred, however, in pH-controlled batch cultures, although incomplete utilization of lactose was observed. Lactate and acetate accumulation caused limitation on growth of bifidobacteria leading to an uncoupling of biomass and product formation. From 70 to 75% of both final lactate and acetate concentrations were produced during the stationary growth phase of Bifidobacterium bifidum, Bifidobacterium breve, and Bifidobacterium longum cultivated in milk, whereas Bifidobacterium infantis produced less acetate or lactate during this phase.

Key Words: Bifidobacterium • production inhibition • milk

Submitted on September 29, 1989
Accepted on January 23, 1990






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Copyright © 1990 by the American Dairy Science Association ®.