Effect of sodium chloride on the survival of Shigella flexneri in acidified laboratory media and cucumber puree.
J Appl Microbiol
; 117(6): 1700-8, 2014 Dec.
Article
em En
| MEDLINE
| ID: mdl-25178712
ABSTRACT
AIMS:
This study investigated the effects of sodium chloride (NaCl) and various acids, alone or in combination, on Shigella flexneri growth in laboratory medium and cucumber puree. METHODS ANDRESULTS:
Shigella flexneri was treated with various acids (acetic, citric, malic, tartaric, propionic, lactic and phosphoric acid) alone or with 3, 6 or 9% NaCl. Pronounced antagonistic effects were observed in Sh. flexneri treated with acetic or lactic acid in combination with 3% NaCl. Next, Sh. flexneri was pre-exposed to 3% NaCl and then treated with various acids; acid-stressed cells were then inoculated onto agar plates containing 3% NaCl. There was no significant difference in the reduction of Sh. flexneri, regardless of treatment (P > 0·05). Finally, Sh. flexneri was inoculated into cucumber puree to which various concentrations of acetic acid had been added with and without 3% NaCl. Antagonistic effects were observed with a treatment of either 0·5 or 1% acetic acid combined with 3% NaCl.CONCLUSIONS:
Antagonistic effects were observed when Sh. flexneri was exposed to acetic or lactic acid with NaCl. SIGNIFICANCE AND IMPACT OF THE STUDY This study shows that depending on the type of acid, the addition of NaCl can increase the resistance of Sh. flexneri to acid treatments. This may provide useful information for developing methods of preserving acidified foods.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Shigella flexneri
/
Cloreto de Sódio
Idioma:
En
Revista:
J Appl Microbiol
Assunto da revista:
MICROBIOLOGIA
Ano de publicação:
2014
Tipo de documento:
Article