Hydrogen peroxide was also studied in the 52 intestinal
isolates selected. This trait was confirmed in L. mucosae INIA
P459. None of the commercial strains tested showed the ability
to produce hydrogen peroxide. In contrast, high percentages
(50–96%) of hydrogen peroxide-producing lactobacilli
from vaginal sources were found by other authors described
this property as strain-specific. On the contrary,
ฃ associated H2O2 production to certain species
like Lactobacillus gasseri and Lactobacillus crispatus.
Coaggregation ability of the 52 selected intestinal isolates
with S. Typhimurium, L. monocytogenes or E. coli O157:H7 was
limited, with scores between 2% and 10% (data not shown).
Three isolates (L. rhamnosus INIA P235, L. paracasei INIA P272
and L. salivarius INIA P340) coaggregated with S. Typhimurium,
6 (E. faecalis INIA P474, L. rhamnosus INIA P235, L. rhamnosus
INIA P426, B. breve INIA P18, B. breve INIA P360 and B.
pseudocatenulatum INIA P435) with L. monocytogenes and 1 (B.
pseudolongum INIA P2) with E. coli O157:H7.