[Synthesis of organic acids by immobilized propionic bacteria in the flow system and stabilization of the process].

The capacity of immobilized cells of propionic bacteria to synthesize organic acids was examined. Propionibacterium shermanii cells incorporated into polyacrylamide gel were capable to synthesize propionic, acetic and pyruvic acids in the flow system. As a carbon source glucose, lactate-Na or whey lactose was used. The greatest amount of the acids was synthesized with the use of lactate-Na. The life-time of the biocatalyst (immobilized cells) can be increased by its reactivation with a nutrient medium required for optimal cell proliferation.