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Applied and Environmental Microbiology, January 2003, p. 668-672, Vol. 69, No. 1
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.1.668-672.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Inactivation of Salmonella enterica Serovar Enteritidis by Ultrasonic Waves under Pressure at Different Water Activities

I. Álvarez, P. Mañas, F. J. Sala, and S. Condón*

Tecnología de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50.013 Zaragoza, Spain

Received 25 April 2002/ Accepted 18 October 2002

The inactivation of Salmonella enterica serovar Enteritidis by ultrasonic waves (20 kHz; 117-µm wavelength) under pressure (175 kPa) at nonlethal temperatures (manosonication [MS]) and lethal temperatures (manothermosonication [MTS]) in media of different water activities has been investigated. Heat decimal reduction time values increased 30 times when the water activity was decreased from nearly 1 to 0.96, but the MS resistance was increased only twofold. The inactivation of Salmonella serovar Enteritidis by ultrasound under pressure at low water activities was a phenomenon of the "all-or-nothing" type. A synergistic lethal effect was observed between heat and ultrasound in media with reduced water activity; the lower the water activity, the greater the synergistic effect. This work could be useful for improving sanitation and preservation treatments of foods, especially those which are sensitive to temperature and those in which components protect microorganisms to heat. It also contributes to our knowledge of microbial inactivation mechanisms by MS and MTS treatments.

* Corresponding author. Mailing address: Tecnología de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Miguel Servet 177, 50.013 Zaragoza, Spain. Phone: 34 976 76 15 81. Fax: 34 976 76 15 90. E-mail: scondon{at}posta.unizar.es.

Applied and Environmental Microbiology, January 2003, p. 668-672, Vol. 69, No. 1
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.1.668-672.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.





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