action of nisin and high ph on growth of staphylococcus aureus and salmonella sp. in pure culture and in the meat of land crab (ucides cordatus) ação da nisina e do ph elevado sobre a multiplicação de staphylococcus aureus e salmonella sp. em cultura pura e em carne de caranguejo-uçá (ucides cordatus)

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ID: 135607
2005
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Abstract
The aim of this study was to evaluate the potential of nisin and high pH to inhibit the growth of Staphylococcus aureus and Salmonella sp. in broth culture and when inoculated into meat of land crab. In pure cultures, the growth of S. aureus was bly inhibited by nisin and the growth of Salmonella sp. was inhibited by nisin-EDTA (20 mM). The inhibition of S. aureus lasted for eight hours and Salmonella sp. growth was inhibited throughout the experiment (24 h). The high pH (pH 10.0 and 11.0 with NaHCO3-NaOH buffer) was very effective for in vitro inhibition of S. aureus and Salmonella sp. Nisin and high pH, when applied to the contaminated meat, did not yield the same effect. Nisin was not effective in preventing growth of both pathogens in the crab meat, while pH 10.0 showed significant inhibitory effect on Salmonella sp. The results suggest that high pH has a potential as antibacterial agent, and may be useful in chemical preservation of crab meat.
O objetivo deste estudo foi avaliar o potencial de inibição de nisina e o pH elevado em relação à multiplicação de Staphylococcus aureus e Salmonella sp. em culturas puras e inoculadas na carne de caranguejo-uçá. Em culturas puras, a multiplicação de S. aureus foi fortemente inibida por nisina e a de Salmonella sp. por nisina-EDTA (20 mM). A multiplicação de S. aureus foi inibida até 8h de incubação, enquanto que a de Salmonella sp. foi inibida durante todo o experimento (24h). O pH elevado (tampão NaHCO3-NaOH, pH 10 e 11) mostrou-se efetivo na inibição da multiplicação de S. aureus e Salmonella sp. Nisina e o pH elevado aplicados na carne contaminada não apresentaram o mesmo efeito. A nisina não mostrou eficiência na inibição dos patógenos quando inoculados na carne de caranguejo, enquanto que o tampão em pH 10 demonstrou inibição significante sobre a multiplicação de Salmonella sp. Estes resultados sugerem que o pH elevado apresenta um potencial como agente antibacteriano, podendo ser útil na preservação química da carne de caranguejo.
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grisi2005brazilianaction Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Teresa Cristina S. de Lima Grisi;Krystyna Gorlach-Lira
Journal ieee software
Year 2005
DOI
10.1590/S1517-83822005000200010
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000200010
Keywords
staphylococcus aureus nisin

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