Lactic acid bacteria (LAB) were isolated from goat's milk in different north west region of Algeria. A total of 233 isolates were identified as LAB. However, only 11 strains showed excellent inhibition zones on agar when Salmonella typhimorium ATCC 13311 was used as an indicator for preliminary detection of antagonistic activity. After elimination of inhibition due to acid and H 2 O 2 , Staphylococcus aureus ATCC 25923 was used for secondary screening for antagonistic activity of these 11 strains. It was found that only 9 strains exhibited a good inhibition zones on agar, and all of them could inhibit E. coli ATCC 25921 and Pseudomonas aeruginosa ATCC 27853 as the third and the forth indicators respectively. Lactococcus lactis subsp. cremoris, Lactobacillus casei subsp. casei, Lactobacillus casei subsp. rhamnosus, Streptococcus salivarius subsp. thermophilus and Lactococcus lactis biovar.diacetylactis were the strains that have a good antibacterial activity, survive in the gastrointestinal conditions and were sensible to the majority of the antibiotics. All isolated strains tolerate pH = 2 and high bile salt concentration.
Purpose: Aluminum (Al) and its various forms are environmental xenobiotics that pose great threats to public health. The probiotic strain has been reported to have important protective effects against aluminum cytotoxicity. Therefore, the current study was designed to assess the disruption of neurobehavioral and hematobiochemical parameters caused by chronic exposure to AlCl3, and then explore the protective effects of the probiotic strain Lactobacillus rhamnosus against these adverse in male rats. Method: Thirty-two animals were gathered into four groups: The first group served as control. The second group received 100mg AlCl3/kg bw for 12 weeks. However, the third group was administered 10mL probiotic strain /Kg (108 CFU/ml) bw/d daily for 4 weeks. Finally, group 4 received AlCl3 for 12 weeks, then the treatment was continued with probiotic for 4 weeks. Results: AlCl3 produced a decrease in body and brain weights with respect to their control. The results obtained also showed significant depression and anxiety-like behavior in the intoxicated animals, with a disturbance of the tested hematobiochemical parameters, particularly in renal and hepatic biomarkers. Overall, probiotics prevented enduring AlCl3-induced depression-like behavior in intoxicated rats. The results of the hematobiochemical, renal and hepatic analyses show a correction of the values after the administration of probiotics compared to those of intoxicated and untreated animals. Conclusion: The probiotic lactobacilli would be an alternative to reduce AlCl3 toxicity.
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