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http://hdl.handle.net/10400.14/6908
Título: | Efficiency of four secondary enrichment protocols in differentiation and isolation of Listeria spp. and Listeria monocytogenes from smoked fish processing chains |
Autor: | Duarte, Gabriela Vaz-Velho, Manuela Capella, Christopher Gibbs, Paul |
Palavras-chave: | Cold-smoked fish Listeria Listeria monocytogenes Secondary selective enrichments Conventional cultural and bactometer capacitance-based detection methods |
Data: | 1999 |
Editora: | Elsevier |
Citação: | DUARTE, Gabriela... [et al.] - Efficiency of four secondary enrichment protocols in differentiation and isolation of Listeria spp. and Listeria monocytogenes from smoked fish processing chains. International Journal of Food Microbiology. Vol. 52, n.º 3 (1999), p. 163–168 |
Resumo: | Four secondary enrichment protocols (conventional methods: UVM II, Fraser 24 h and Fraser 48 h: Impedimetric method: Listeria electrical detection medium) were studied for their ability to isolate Listeria spp. and Listeria monocytogenes from fish and environmental samples collected along the processing chain of cold-smoked fish. From all methods, Listeria spp. and L. monocytogenes were respectively present in 56 and 34 of 315 samples analysed. Fraser broth incubated for 48 h gave the fewest false negative Listeria spp. results [4/56; (7.1%)], but concurrently only 15/34 (44.1%) samples were correctly identified as containing L. monocytogenes. Listeria electrical detection (LED) medium detected only 36/56 (64.3%) Listeria spp. positive samples. Despite this lower isolation rate, LED identified 20/34 (58.8%) L. monocytogenes positive samples correctly and gave fewer false positive results. The overall conclusion was that more than one isolation method is needed to accurately estimate L. monocytogenes contamination rates. |
Peer review: | yes |
URI: | http://hdl.handle.net/10400.14/6908 |
DOI: | 10.1016/S0168-1605(99)00121-X |
Aparece nas colecções: | ESB - Artigos / Articles |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Efficiency of four secondary enrichment protocols in differentiation.pdf | 52,74 kB | Adobe PDF | Ver/Abrir |
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