Lactobacilli and Bifidobacteria: A Parapostbiotic Approach to Study and Explain Their Mutual Bioactive Influence.

Three strains of and three bifidobacteria ( subsp. , , and ) were used as target strains; in addition, for each microorganism, the cell-free supernatant (CFS) was produced and used as an ingredient of the growth medium. Namely CFSs from lactobacilli were used on bifidobacteria and CFSs from bifidobacteria were used on lactobacilli.

Study on bioactivity of cell-free filtrates from dairy propionibacteria.

In this paper, the bioactivity of cell-free extracts obtained by dairy propionibacteria strains was investigated. Probiotic bifidobacteria and lactobacilli were used as microbial targets. The extracellular filtrates were added as ingredient (1% v/v) into the growth medium; the effect of cell-free filtrates was evaluated through viable count of microbial targets on appropriate media, monitoring the response of target microorganisms both in growth and death phase.