Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/21546
Tipo: Artigo
Título: Temperature and pH influence the susceptibility of Salmonella Typhimurium to nisin combined with EDTA
Autor(es): Prudêncio, Cláudia Vieira
Mantovani, Hilário Cuquetto
Cecon, Paulo Roberto
Prieto, Miguel
Vanetti, Maria Cristina Dantas
Abstract: antibiotics, such as nisin, generally act on Gram-positive bacteria, whereas Gram-negative bacteria exhibit natural resistance to the action of these bacteriocins. However, Gram-negative bacteria can become susceptible to the action of these antimicrobial peptides with the use of chelating agents, such as EDTA. The activity of bacteriocins can be influenced by several factors, such as environmental conditions and chemical composition of the medium. Moreover, the susceptibility of target microorganism can be altered, due to changes in cellular composition induced by environmental conditions. In this study, we examined the combined effect of variations in temperature and pH on the susceptibility of Salmonella Typhimurium to the action of nisin associated with EDTA. The reduction in the number of viable cells of Salmonella Typhimurium varied according to the temperature and pH, and major reduction in logarithmic cycles of viable cells occurred with a temperature increase. Under low temperature and low pH, a considerable reduction in the viability was also observed after prolonged exposure to bacteriocin, regardless of the presence of EDTA. According to results, temperature and pH conditions influence on the susceptibility of Salmonella Typhimurium to combination of nisin and EDTA and thus should be considered to establish optimal conditions for nisin use.
Palavras-chave: Bacteriocins
Biocontrol
Environmental conditions
Gram-negative bacteria
Editor: Food Control
Tipo de Acesso: Elsevier Ltd.
URI: https://doi.org/10.1016/j.foodcont.2015.09.042
http://www.locus.ufv.br/handle/123456789/21546
Data do documento: Mar-2016
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