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This study investigated the ability of two strains of Lactobacillus plantarum isolated from akamu a Nigerian fermented maize food to tolerate acid and bile condition. Auto-aggregation and co-aggregation with pathogens: Escherichia coli NCTC 11560 and Salmonella Enteritidis NCTC 5188 were also investigated. This was aimed at establishing preliminary probiotic potentials of these none intestinal L. plantarum isolates. Viability at pH 2 was significantly (p≤0.05) reduced from ≥8.26±0.05 to ≤4.94±0.49 Log10 CFU/mL after 3 h. Subsequent incubation in 0.3% ox gall bile media after 6 h enhanced growth to 5.73±0.13 and 7.93±0.12 Log10 CFU/mL for NGL5 and NGL7. The L. plantarum strains auto-aggregated but had no co-aggregation with the pathogens. After 5 h auto-aggregation at 37°C (>25%) was significantly (p≤0.05) greater than auto-aggregation at 22 - 24°C (<14%). The L. plantarum strains possessed abilities to survive passage through the GIT and auto-aggregated significantly at body temperature. This serves as a baseline data for further studies especially isolates that are not of intestinal origin.

Acid, Bile and Aggregation Abilities of Lactobacillus plantarum Strains Isolated from Akamu a Nigerian Fermented Maize Food