title: In vitro antagonistic activity evaluation of Lactic Acid Bacteria (LAB) combined with cellulase enzyme against campylobacter jejuni growth in co-culture.
abstract: The antibacterial effects of nine lactic acid bacteria (LAB) against Campylobacter jejuni were investigated by using agar gel diffusion and co-culture assays. Some differences were recorded between the inhibition effects measured with these two methods. Only two LAB, Lb. pentosus CWBI B78 and E. faecium THT, exhibited a clear anti- Campylobacter activity in co-culture assay with dehydrated poultry excreta mixed with ground straw (DPE/GS) as the only growth substrate source. It was observed that the supplementation of such medium with a cellulase A complex (Beldem S.A.) enhanced the antimicrobial effect of both LAB strains. The co-culture medium acidification and the C. jejuni were positively correlated with the cellulase A concentration. The antibacterial effect was characterized by the lactic acid production from the homofermentative E. faecium THT and the lactic and acetic acids production from the heterofermentative Lb. pentosus CWBI B78. The antagonistic properties of LAB strains and enzyme combination could be used in strategies aiming at the reduction of Campylobacter prevalence in the poultry production chain and consequently the risk of human infection.
authors.affiliation: University of Liege, Gembloux Agro-Bio Tech, Animal Science Unit, Passage des Deportes 2, 5030 Gembloux, Belgium. r.duboisdauphin@ulg.ac.be
authors.forename: Robin
authors.initials: R
authors.lastname: Dubois-Dauphin
authors.forename: Vandeplas
authors.initials: V
authors.lastname: Sabrina
authors.forename: Didderen
authors.initials: D
authors.lastname: Isabelle
authors.forename: Marcq
authors.initials: M
authors.lastname: Christopher
authors.forename: Thewis
authors.initials: T
authors.lastname: Andre
authors.forename: Thonart
authors.initials: T
authors.lastname: Philippe
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D000898:Antibiosis; D016123:Campylobacter jejuni / Q000187:drug effects / Q000502:physiology*; D002480:Cellulase / Q000494:pharmacology*; D018920:Coculture Techniques; D003470:Culture Media / Q000378:metabolism / Q000494:pharmacology; D019344:Lactic Acid / Q000378:metabolism / Q000494:pharmacology; D056546:Lactobacillales / Q000502:physiology*
chemical_list: D000900:Anti-Bacterial Agents; D003470:Culture Media; D019344:Lactic Acid; D002480:Cellulase