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The Influence of Moderate Pressure and Subzero Temperature on the Shelf Life of Minced Cod, Salmon, Pork and Beef Meat

Edyta Malinowska-Pańczyk* and Ilona Kołodziejska


Department of Food Chemistry, Technology and Biotechnology, Chemical Faculty, Gdansk University of Technology, G. Narutowicza 11/12, PL-80-952 Gdańsk, Poland

Article history
:
Received May 25, 2012

Accepted May 7, 2013


Key words:

moderate pressure, subzero temperature, inactivation of microorganisms, microflora of minced pork, beef and fish meat

Summary:

The effect of moderate pressure at subzero temperature on natural microflora of minced cod, salmon, pork and beef meat was studied. Pressure of 193 MPa at –20 °C caused the reduction of total bacterial count in pork and beef meat by 1.1 and 0.6 log cycles, respectively, and by about 1.5 log cycles in fish meat. Under these conditions the psychrophilic and psychrotrophic bacteria were below the detection limit (<10 CFU/g of sample) in pork and beef meat, while in cod and salmon meat they were reduced only by 1.3 and 2.0 log cycles, respectively. In all tested samples of meat treated with the pressure of 193 MPa at –20 °C, the number of coliforms was below 10 CFU/g. Under these conditions a significant reduction in the number of coagulase-positive Staphylococcus was also observed. During storage of samples at 4 °C after pressurization at 193 MPa and –20 °C, the inhibition of growth of all tested groups of bacteria was observed. Moderate pressure at subzero temperature does not ensure complete inactivation of bacteria; however, it allows the improvement of microbiological quality and extension of shelf life of food, which depends on the level of bacterial contamination of the initial raw material.


*Corresponding author:        edyta.malinowska-panczyk@pg.gda.pl
                                             ++48 58 347 2694

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