Oxidation of glycerol, lactate, and propionate by Propionibacterium freudenreichii in a poised-potential amperometric culture system

Enhanced Propionate Formation by Propionibacterium freudenreichii subsp. freudenreichii in a Three-Electrode Amperometric Culture System.

In order to influence the fermentation pattern of Propionibacterium freudenreichii towards enhanced propionate formation, growth and product formation with glucose and lactate as energy sources were studied in a three-electrode poised-potential amperometric culture system. With anthraquinone 2,6-disulfonic acid (E(0)' = -184 mV; poised electron potential = -224 mV) or cobalt sepulchrate (E(0)' ...

Utilization of coenzyme A by Propionibacterium freudenreichii.

Propionate acts as earboxylic group aeeeptor in aspartate fermentation by Propionibacterium freudenreichii

Cells of Propionibacterium freudenreichii ssp. shermanii and ssp. freudenreichii did not show significant growth or product formation in a mineral medium with 10 mM aspartate or 10 mM fumarate, vitamins, and a small amount (0.05% w/v) of yeast extract. In the presence of added propionate, growth with aspartate or fumarate was possible, and depended strictly on the amount of propionate provided,...

Propionic acid production in glycerol/glucose co-fermentation by Propionibacterium freudenreichii subsp. shermanii.

Propionibacterium freudenreichii subsp. shermanii can ferment glucose and glycerol to propionic acid with acetic and succinic acids as two by-products. Propionic acid production from glucose was relatively fast (0.19 g/Lh) but gave low product yield (~0.39 g/g) and selectivity (P/A: ~2.6; P/S: ~4.8). In contrast, glycerol with a more reduced state gave a high propionic acid yield (~0.65 g/g) an...

Lipase and Esterase Activities of Propionibacterium freudenreichii subsp. freudenreichii.

The lipase and esterase activities of eight strains of dairy Propionibacterium freudenreichii subsp. freudenreichii were studied. A lipase activity was detected on whole cells and in the culture supernatant. The highest activity was expressed at 45 degrees C and pH 6.8. An esterase activity was also detected in the culture medium. The electrophoresis of the intracellular fractions of the cells ...