Inactivation of Escherichia coli K-12 exposed to pressures in excess of 300 MPa in a high-pressure homogenizer

T. Matthew Taylor, Adrienne Roach, D. Glenn Black, P. Michael Davidson, Federico Miguel Harte

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Homogenization is used widely in the dairy industry to improve product stability and quality. High-pressure homogenization (HPH) of fluid foods up to pressures of 300 MPa has demonstrated excellent potential for microbial inactivation. Microbial inactivation can be enhanced during HPH with the inclusion of antimicrobial compounds. Escherichia coli K-12 cells, grown statically or in chemostat, were exposed to HPH processing pressures of 50 to 350 MPa in the absence or presence of the antimicrobial nisin. Valve temperature was regulated by a water bath and pressure, and temperature data were recorded continuously after process initiation. Survivors were enumerated via plating on nonselective growth media. Pressure and temperature at the valve outlet port exhibited a quadratic relationship (R2 = 0.9617, P < 0.05). Significant HPH-induced inactivation of the gram-negative microorganism was observed in the range of 100 to 250 MPa. Above 300 MPa, heat was the main factor promoting microbial inactivation, regardless of whether cells were grown in chemostat or statically. Chemostat-grown cells were significantly (P < 0.05) more resistant to HPH processing than were statically grown cells. Data indicate potential synergistic effects of nisin and HPH on the inactivation of bacterial contaminants. This study represents the first report of inactivation of a bacterium with HPH pressures in excess of 300 MPa in the presence and absence of an antimicrobial.

Original languageEnglish (US)
Pages (from-to)1007-1010
Number of pages4
JournalJournal of Food Protection
Volume70
Issue number4
DOIs
StatePublished - Jan 1 2007

Fingerprint

Escherichia coli K12
homogenizers
inactivation
Escherichia coli
homogenization
Pressure
Microbial Viability
Nisin
nisin
valves (equipment)
anti-infective agents
Temperature
Dairying
cells
temperature
bacterial contamination
dairy industry
Baths

All Science Journal Classification (ASJC) codes

  • Food Science
  • Microbiology

Cite this

Taylor, T. Matthew ; Roach, Adrienne ; Black, D. Glenn ; Davidson, P. Michael ; Harte, Federico Miguel. / Inactivation of Escherichia coli K-12 exposed to pressures in excess of 300 MPa in a high-pressure homogenizer. In: Journal of Food Protection. 2007 ; Vol. 70, No. 4. pp. 1007-1010.
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Inactivation of Escherichia coli K-12 exposed to pressures in excess of 300 MPa in a high-pressure homogenizer. / Taylor, T. Matthew; Roach, Adrienne; Black, D. Glenn; Davidson, P. Michael; Harte, Federico Miguel.

In: Journal of Food Protection, Vol. 70, No. 4, 01.01.2007, p. 1007-1010.

Research output: Contribution to journalArticle

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