title: Antimicrobial susceptibility of Aeromonas spp. isolated from pig ileum segments to natural isothiocyanates.
abstract: With this study we intend to evaluate the effects of 8 different glucosinolate hydrolysis products including isothiocyanates as antibacterial compounds against Aeromonadaceae, isolated from intestinal segments of pigs collected directly from slaughter-houses in the North of Portugal. Four Aeromonas species, A. allosaccharophila, A. hydrophila, A. media and A. veronii were identified. Using disc-diffusion bioassay all compounds were tested at 6 different doses (0.015, 0.15, 0.75, 1.5 and 3.0 µmoles) in dimethyl-sulfoxide (DMSO). Antibiotic standard (gentamicin) and DMSO (negative control) were included in all experiments. Minimum and maximum dose inhibitions (in µmoles) were assessed. To our knowledge, this is the first study of antimicrobial activity of glucosinolate hydrolysis products against Aeromonas species. The results showed that glucosinolate hydrolysis products and particularly the isothiocyanates have antimicrobial activity, which was proportional to the concentration used. However, not all revealed the same tendency, which means that the chemical structure of each compound is fundamental to understand their effectiveness. Among the different isothiocyanates the benzylisothiocyanate, sulforaphane and 2-phenylethylisothiocyanate were the most effective in vitro inhibitors of bacterial growth. This in vitro study provides enough data to demonstrate the potential use of these natural dietary chemicals for treating infectious diseases caused by Aeromonas spp.
authors.affiliation: CITAB-Centre for the Research and Technology for Agro-Environment and Biological Sciences, Universidade de Trásos-Montes e Alto Douro, Apartado 1013, 5000-801 Vila Real, Portugal.
authors.forename: Alfredo
authors.initials: A
authors.lastname: Aires
authors.forename: Carla S P
authors.initials: CS
authors.lastname: Dias
authors.forename: Eduardo A S
authors.initials: EA
authors.lastname: Rosa
authors.forename: Maria Jose
authors.initials: MJ
authors.lastname: Saavedra
mesh_terms: D000333:Aeromonas / Q000187:drug effects*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001681:Biological Assay; D002478:Cells, Cultured; D007082:Ileum / Q000382:microbiology*; D017879:Isothiocyanates / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D013552:Swine
chemical_list: D000900:Anti-Bacterial Agents; D017879:Isothiocyanates