[Relation of acetoin and valine in Enterobacteriaceae cultures on media with glucose and glycerin].

The ratio between acetoin and valine produced by the cultures of the family Enterobacteriaceae changes upon the addition of glucose and glycerol or their mixture to a defined medium. The experiments were carried out with 12 strains of Aerobacter aerogenes and 2 strains of Aerobacter cloacae and Serratia marcescens. The highest yield of acetoin was found on the medium with glucose (12.5--13.0 g/litre); the maximum accumulation of valine was registered on the medium with glucose and glycerol (1.8--4.8 g/litre). The presence of glycerol in the medium decreased the production of acetoin by 27--85 percent compared to that on the glucose-mineral medium.