UTILIZATION OF SOME PURINE RIBOSIDE DERIVATIVES BY LACTOBACILLUS CASEI

Proteolysis by Lactobacillus casei

A study of the proteinase activity of Lactobacillus casei grown in milk and of cell-free extract of L. cawi has been reported on in a previous paper (Brandsaeter and Nelson, 1956). Whereas the proteinases of L. casei have been studied to some extent earlier, very little has been done to characterize the peptidases of this organism. Other lactobacilli hydrolyze some peptides (Christophersen and ...

Toxicity of some solvents and extractants towards Lactobacillus casei cells

Various organic compounds used as diluents, modifiers and extractants in lactic acid extraction have been tested to determine their toxicity towards Lactobacillus casei cells. The toxicity on molecular and phase level has been investigated. In general, the tested hydrocarbons were non-toxic on molecular level and showed variable toxicity on phase level. Among the tested alcohols octanol and ole...

Diacetyl and acetoin production by Lactobacillus casei.

Agitation of broth cultures of Lactobacillus casei retarded cellular dry weight accumulation but enhanced production of both diacetyl and acetoin. Addition of pyruvate overcame this retardation, but addition of sulfhydryl-protecting reagents did not. Both pyruvate and citrate enhanced accumulated dry weight of L. casei incubated without agitation, but only pyruvate increased diacetyl accumulati...

Utilization of phenylalanine, phenyllactic acid, and phenylpyruvic acid by Lactobacillus casei.

Cell surface characteristics of Lactobacillus casei subsp. casei, Lactobacillus paracasei subsp. paracasei, and Lactobacillus rhamnosus strains.

Hydrophilic and electrostatic cell surface properties of eight Lactobacillus strains were characterized by using the microbial adhesion to solvents method and microelectrophoresis, respectively. All strains appeared relatively hydrophilic. The strong microbial adhesion to chloroform, an acidic solvent, in comparison with microbial adhesion to hexadecane, an apolar n-alkane, demonstrated the par...