Present address: Ethan B. Solomon, USDA-ARS-ERRC, 600 E, Mermaid Lane, Wyndmoor, PA 19038-8598, USA.
Inactivation of Campylobacter jejuni by high hydrostatic pressure
Version of Record online: 13 APR 2004
Letters in Applied Microbiology
Volume 38, Issue 6, pages 505–509, June 2004
How to Cite
Solomon, E.B. and Hoover, D.G. (2004), Inactivation of Campylobacter jejuni by high hydrostatic pressure. Letters in Applied Microbiology, 38: 505–509. doi: 10.1111/j.1472-765X.2004.01527.x
- Issue online: 15 APR 2004
- Version of Record online: 13 APR 2004
- 2003/0761: received 27 August 2003, revised 16 January 2004 and accepted 15 March 2004
- Campylobacter jejuni;
- high hydrostatic pressure processing;
Aims: To investigate the response of Campylobacter jejuni ATCC 35919 and 35921 to high pressure processing (HPP) while suspended in microbiological media and various food systems.
Methods and Results: Campylobacter jejuni 35919 and 35921 were subjected to 10-min pressure treatments between 100 and 400 MPa at 25°C suspended in Bolton broth, phosphate buffer (0·2 m, pH 7·3), ultra-high temperature (UHT) whole milk, UHT skim milk, soya milk and chicken pureé. The survivability of C. jejuni was further investigated by inoculated pack studies. HPP at 300–325 MPa for 10 min at 25°C was sufficient to reduce viable numbers of both strains to below detectable levels when cells were pressurized in Bolton broth or phosphate buffer. All food products examined offered a protective effect in that an additional 50–75 MPa was required to achieve similar levels of inactivation when compared with broth and buffer. Inoculated pack studies showed that the survivability of C. jejuni following pressurization improved with decreasing post-treatment storage temperature.
Significance and Impact of the Study: These data demonstrated that HPP at levels of ≤400 MPa, can inactivate C. jejuni in both model and food systems.