E. coli ATCC 11775 and Listeria innocua ATCC 33090.(In brief)

E. coli ATCC 11775 and Listeria innocua ATCC 33090 in whole milk were inactivated by scientists using single- and multi-pulsed (up to 10 pulses) high hydrostatic pressure (HHP) treatments. Both bacteria showed similar resistance to single- and multi-pulsed HHP. So it appears that the efficiency of pulsed pressure treatments depends on a combination of holding time of each pulse plus the number of pulses used.

Researchers observed that a multi-pulsed pressure treatment instead of a traditional single-pulsed HHP treatment could be used to pasteurize milk at a lower pressure levels. Nevertheless, it is necessary to optimize the combination of pulse holding time, the number of pulses and pressure levels in order to reach the desirable log-reduction of microorganisms compatible with the specific application at hand.

Contact: Sencer Buzrul, Food Engineering Department, Middle East Technical University, 06531 Ankara, Turkey. Phone: +90 312 218 03 00. Fax: +90 312 284 23 13. Email: sencer.buzrul@tapdk.gov.tr.

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