Modeling the aerobic growth and decline of <i>Staphylococcus aureus</i> as affected by pH and potassium sorbate concentration

The effects of pH (5.0, 5.2, 5.4, 5.6, and 5,8) and concentration of potassium sorbate (10.0 and 16.6 mM) at two water activity values (0.90 and 0.92) on the aerobic growth and decline of Staphylococcus aureus ATCC 6538P, 196-E, and FDA-C243 were studied using brain-heart infusion broth. The inoculu...

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Autores principales: Giannuzzi, Leda, Contreras, Edgardo Martín, Zaritzky, Noemí Elisabet
Formato: Articulo
Lenguaje:Inglés
Publicado: 1999
Materias:
Ingeniería Química
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/139209
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-139209
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería Química
spellingShingle Ingeniería Química
Giannuzzi, Leda
Contreras, Edgardo Martín
Zaritzky, Noemí Elisabet
Modeling the aerobic growth and decline of <i>Staphylococcus aureus</i> as affected by pH and potassium sorbate concentration
topic_facet Ingeniería Química
description The effects of pH (5.0, 5.2, 5.4, 5.6, and 5,8) and concentration of potassium sorbate (10.0 and 16.6 mM) at two water activity values (0.90 and 0.92) on the aerobic growth and decline of Staphylococcus aureus ATCC 6538P, 196-E, and FDA-C243 were studied using brain-heart infusion broth. The inoculum was approximately 4 to 5 log CFU/ml, and the incubation temperature was 30 degrees C. Samples were periodically enumerated on tryptic soy agar. The Gompertz model was used to obtain microbial growth parameters, specific growth rate was obtained as a derived parameter, and the inhibition index was calculated. A linear model was fitted in cases of bacteriostatic or bactericidal action of the treatment. The ATCC 6538P strain showed the highest resistance in the range of tested conditions. Microbial behavior was modeled considering the main controlling factors, and a response surface methodology was used to determine the effects of undissociated acid concentration and pH. These results can be used to establish treatment conditions for microorganism growth or inhibition.
format Articulo
Articulo
author Giannuzzi, Leda
Contreras, Edgardo Martín
Zaritzky, Noemí Elisabet
author_facet Giannuzzi, Leda
Contreras, Edgardo Martín
Zaritzky, Noemí Elisabet
author_sort Giannuzzi, Leda
title Modeling the aerobic growth and decline of <i>Staphylococcus aureus</i> as affected by pH and potassium sorbate concentration
title_short Modeling the aerobic growth and decline of <i>Staphylococcus aureus</i> as affected by pH and potassium sorbate concentration
title_full Modeling the aerobic growth and decline of <i>Staphylococcus aureus</i> as affected by pH and potassium sorbate concentration
title_fullStr Modeling the aerobic growth and decline of <i>Staphylococcus aureus</i> as affected by pH and potassium sorbate concentration
title_full_unstemmed Modeling the aerobic growth and decline of <i>Staphylococcus aureus</i> as affected by pH and potassium sorbate concentration
title_sort modeling the aerobic growth and decline of <i>staphylococcus aureus</i> as affected by ph and potassium sorbate concentration
publishDate 1999
url http://sedici.unlp.edu.ar/handle/10915/139209
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