Growth of 2 strains of Bifidobacterium breve and 4 strains of Bifidobacterium animalis was evaluated with glucose, raffinose or a mixture of glucose and raffinose as substrates. All strains of B. animalis and one strain of B. breve grew more slowly on glucose than on raffinose or the mixture of glucose and raffinose; one strain of B. breve grew more rapidly on the mixture of glucose and raffinose than on raffinose while 2 strains of B. animalis grew faster on raffinose than on the mixture of raffinose and glucose. Both strains of B. breve utilized glucose and raffinose simultaneously. In contrast, all strains of B. animalis strains displayed atypical growth with rapid utilization of raffinose followed by slow utilization of glucose. The cell morphology of all strains of B. animalis was affected by the sugar used for cultivation: tiny and rather spherical cells were observed on glucose while on media with raffinose the cells were large and had the species-specific shape. Description of preferential utilization of various saccharides by bifidobacteria can contribute to the development of new synbiotic preparations and new cultivation media for bifidobacteria.

Department of Microbiology and Biotechnology Czech University of Agriculture Prague Czechia

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