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Virulence factors among enterococci isolated from traditional fermented meat pr...
Barbosa, J.; Gibbs, P. A.; Teixeira, P.The aim of this work was to characterize Enterococcus spp. isolated from Alheira, Chouriça de Vinhais and Salpicão de Vinhais, fermented meat products produced in the North of Portugal, concerning their potential pathogenicity. One hundred and eighty two isolates (76 identified as Enterococcus faecalis, 44 as Enterococcus faecium, 1 as Enterococcus casseliflavus and 61 as Enterococcus spp.) were studied. Twenty...
Effects of the components of two antimicrobial emulsions on food-borne pathogens
Ferreira, J.P.; Alves, D.; Neves, O.; Silva, J.; Gibbs, P.A.; Teixeira, P.C.Several recent reports in the literature show that some microemulsions and nanoemulsions have interesting antimicrobial properties. However, those studies lacked appropriate controls showing the action of the isolated components at similar concentrations. In this study we demonstrate that the bactericidal effects of two previously studied emulsions are due predominantly to one of their components. In fact, the ...
Effect of the pH of growth on the survival of Lactobacillus delbrueckii subsp. ...
Silva, J.; Carvalho, A. S.; Ferreira, R.; Vitorino, R.; Amado, F.; Domingues, P.; Teixeira, P.; Gibbs, P. A.Aims: The aim of this study was to optimize survival of Lactobacillus delbrueckii subsp. bulgaricus during spraydrying and subsequent storage through optimizing the pH of growth conditions. Methods and Results: Cell concentrates previously grown without or with pH controlled were spray-dried and stored at 20ºC and heat treated at 57ºC. Cells grown under noncontrolled pH were more resistant to both drying and he...
Sensorial and microbial effects of gaseous ozone on fresh
Silva, M. V. da; Gibbs, P.A.; Kirby, R. MThe bactericidal activity of gaseous ozone was investigated using a commercial ozone generator. Five species of fish bacteria, Pseudomonas putida, Shewanella putrefaciens, Brochothrix thermosphacta, Enterobacter sp. and Lactobacillus plantarum, were inoculated on agar surfaces and exposed to different ozonation times in a gas chamber. Results showed ozone in relatively low concentrations ( 0·27 10 3 g l 1) was ...
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