title: Enterococcus faecium and Enterococcus durans isolated from cheese: Survival in the presence of medications under simulated gastrointestinal conditions and adhesion properties.
abstract: In this study, we evaluated the survival of Enterococcus faecium and Enterococcus durans, isolated from cheese, in the presence of medications and under simulated in vitro gastrointestinal conditions. The presence of genes encoding virulence factors, the susceptibility to antimicrobial agents, and adhesion properties were also assessed. Enterococcus faecium and E. durans both exhibited resistance to most of the tested medications but showed a large sensitivity to analgesics and antihypertensives; they also showed wide susceptibility to antimicrobial agents. Enterococcus durans SJRP29 had greater resistance to the presence of medications in comparison with the probiotic Lactobacillus acidophilus La-5. The strains, except for E. durans SJRP05, did not harbor virulence genes. Enterococcus durans SJRP14, SJRP17, and SJRP26 were sensitive to all tested antimicrobial agents. Enterococcus faecium was more stable during the simulation of gastrointestinal tract and showed greater viability. At the end of the assay, except for E. durans SJRP17, all strains showed high viability (>7 log cfu/mL). Enterococcus durans SJRP29 stood out from the other strains and was selected for further evaluation; it tolerated up to 3.0% NaCl at 30 and 37°C, besides having good adhesion properties (high values of auto-aggregation, co-aggregation, and hydrophobicity). Additionally, the microorganism did not show bile salt hydrolase activity or mucin degradation. These results encourage carrying out additional tests to evaluate the probiotic features by using in vitro dynamic models and in vivo tests before applying these strains to a food system.
authors.affiliation: UNESP-Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, Rua Cristóvão Colombo, 2265, 15054-000 São José do Rio Preto, SP, Brazil.
authors.forename: Daniel M F
authors.initials: DMF
authors.lastname: Amaral
authors.affiliation: UNESP-Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, Rua Cristóvão Colombo, 2265, 15054-000 São José do Rio Preto, SP, Brazil.
authors.forename: Luana F
authors.initials: LF
authors.lastname: Silva
authors.affiliation: UNESP-Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, Rua Cristóvão Colombo, 2265, 15054-000 São José do Rio Preto, SP, Brazil.
authors.forename: Sabrina N
authors.initials: SN
authors.lastname: Casarotti
authors.affiliation: UNESP-Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, Rua Cristóvão Colombo, 2265, 15054-000 São José do Rio Preto, SP, Brazil.
authors.forename: Liane Caroline Sousa
authors.initials: LCS
authors.lastname: Nascimento
authors.affiliation: UNESP-Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, Rua Cristóvão Colombo, 2265, 15054-000 São José do Rio Preto, SP, Brazil. Electronic address: analucia@ibilce.unesp.br.
authors.forename: Ana Lúcia B
authors.initials: ALB
authors.lastname: Penna
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents; D002611:Cheese; D016983:Enterococcus / Q000302:isolation & purification; D016984:Enterococcus faecium / Q000235:genetics*; D007778:Lactobacillus; D008826:Microbial Sensitivity Tests; D019936:Probiotics
chemical_list: D000900:Anti-Bacterial Agents
keywords: adhesion properties; drug and antibiotic susceptibility; lactic acid bacteria; tolerance to gastrointestinal condition