Antimicrobial activity of Enterococcus faecium FAIR-E 198 against gram-positive pathogens
Braz. j. microbiol
;
41(1): 74-81, Jan.-Mar. 2010. graf, tab
Artigo
em Inglês
| LILACS
| ID: lil-531737
ABSTRACT
This study investigated the antimicrobial activity of Enterococcus faecium FAIR-E 198 against Bacillus cereus, Listeria monocytogenes and Staphylococcus aureus. Using the critical-dilution method, the bacteriocin produced by E. faecium FAIR-E 198 inhibited all L. monocytogenes strains evaluated (1,600 to 19,200 AU mL-1). However, none of the B. cereus and S. aureus strains investigated were inhibited. The maximum activity of this bacteriocin (800 AU mL-1) was observed in MRS broth, while the activity in milk was 100 AU mL-1. In the co-cultivation test in milk, B. cereus K1-B041 was reduced to below the detection limit (1.00 log CFU mL-1) after 48 h. E. faecium reduced the initial L. monocytogenes Scott A population by 1 log CFU mL-1 after 3 h at 35ºC. However, the pathogen regained growth, reaching 3.68 log CFU mL-1 after 48 h. E. faecium did not influence the growth of S. aureus ATCC 27154 during the 48 h of co-cultivation. Therefore, it can be concluded that the effectiveness of the antimicrobial activity of E. faecium FAIR-E 198 is strictly related to the species and strain of the target microorganism and to the culture medium.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Bacteriocinas
/
Contaminação de Alimentos
/
Enterococcus faecium
/
Laticínios
Tipo de estudo:
Estudos de avaliação
Idioma:
Inglês
Revista:
Braz. j. microbiol
Assunto da revista:
Microbiologia
Ano de publicação:
2010
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Instituto de Tecnologia de Alimentos/BR
/
Universidade Estadual de Campinas/BR
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