Microbiological Studies on Aeromonas and Pseudomonas Species Isolated From Contaminated Fish Foods

Three bacterial isolates related to the Genus Aeromonas and eleven isolates related to the Genus Pseudomonas isolated from contaminated fish foods were studied in this work. The study included the identification of these isolates and their susceptibility to the crude extracts of five weeds and four new synthesized thiazolidinone derivatives. The isolates were identified as Aeromonas hydrophila, Pseudomonas aeruginosa, Pseudomonas putida, and Pseudomonas stutzeri. The antibacterial activities investigations of the extracts and the thiazolidinone derivatives were performed on solidified growth plates and in liquid media. On solid plates, the highest inhibitory effects (inhibition zones) were recorded to the crude extract of Brassica tournefortii inhibiting the growth of all tested species with inhibition zones 8-18mm diameters. The lowest effects were recorded to the extract of Convolvulus arvensis inhibiting only the growth of Pseudomonas putida. Among the four thiazolidinone derivatives tested, the highest effects were recorded to the derivatives (1d) and (2d) and the lowest effects were recorded to the derivative (4a) inhibiting the growth of Aeromonas hydrophila only. In liquid media, the growth of different Aeromonas and Pseudomonas species-in terms of optical densities at 660nm-was affected by most of the crude extracts and thiazolidinone derivatives. (Mohamed T. Shaaban Microbiological Studies on Aeromonas and Pseudomonas Species Isolated From Contaminated Fish Foods. Life Science Journal. 2012;9(2):970-979). (ISSN:1097-8135). http://www.lifesciencesite.com. 143