Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/7514
Título: Behavior of Listeria monocytogenes isolates through gastro-intestinal tract passage simulation, before and after two sub-lethal stresses
Autor: Barbosa, J.
Borges, S.
Magalhães, R.
Ferreira, V.
Santos, I.
Silva, J.
Almeida, G.
Gibbs, P.
Teixeira, P.
Palavras-chave: Listeria monocytogenes
Gastro-intestinal tract
Sub-lethal stresses
Acid stress
Salt stress
Data: 2012
Editora: Elsevier
Citação: BARBOSA, J... [et al.] - Behavior of Listeria monocytogenes isolates through gastro-intestinal tract passage simulation, before and after two sub-lethal stresses. Food Microbiology. ISSN 0740-0020. Vol. 30, n.º 1 (2012), p. 24-28
Resumo: The effects of previous exposure to sub-lethal acidic and osmotic stresses on the survival of Listeria monocytogenes during exposure to gastro-intestinal (GI) tract simulation, was investigated. Six L. monocytogenes strains isolated from cheeses were selected and exposed to high salt concentrations or acidic conditions and their viability compared in quick and slow digestions. The results demonstrated that (i) all isolates were more sensitive to the exposure to acidic than to osmotic sub-lethal conditions (ii) significant differences (p < 0.05) between the two types of digestion were observed; in slow digestion, the log reduction was higher for all the tested isolates (iii) all isolates were inhibited in the presence of bile salts for both types of digestion (iv) differences between quick and slow digestion were not observed (p > 0.05) after exposure to either osmotic or acidic stress (v) a higher cellular inactivation (p < 0.001) was observed during the passage through the GI tract simulation after exposure to osmotic than to acidic stresses and (vi) neither osmotic nor acidic sub-lethal stresses conferred resistance to simulated GI tract conditions.
Peer review: yes
URI: http://hdl.handle.net/10400.14/7514
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0740002011002383
Aparece nas colecções:CBQF - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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