Microbiological quality of mechanically recovered poultry meat treated with high hydrostatic pressure and nisin |
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| Affiliation: | 1. Clinical Center of the National Institutes of Health (NIH), 10 Center Dr, Bethesda, MD 20814, USA;2. Frank H. Netter SOM, Quinnipiac University, North Haven, CT 06473, USA;3. National Institute of Child Health and Human Development (NICHD), Bethesda, MD 20814, USA;4. Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke (NINDS), Bethesda, MD 20814, USA;5. Laboratory of Pathology, National Cancer Institute (NCI), Bethesda, MD 20814, USA;6. Diagnostic Radiology Department, NIH Clinical Center (CC), Bethesda, MD 20814, USA;7. Division of Intramural Research, National Institute of Child Health and Human Development (NICHD), Bethesda, MD 20814, USA;2. Izmir Tepecik Education and Research Hospital Head and Neck Surgery Clinic, Izmir, Turkey;3. Izmir Tepecik Education and Research Hospital Radiology Clinic, Izmir, Turkey;4. Izmir Tepecik Education and Research Hospital Microbiology and immunology Clinic, Izmir, Turkey |
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| Abstract: | The combined effect of high hydrostatic pressure processing, addition of nisin and acidification on aerobic mesophilic and psychrotrophic bacterial populations of mechanically recovered poultry meat (MRPM) kept under refrigeration (2°C) was evaluated 1, 15 and 30 days after pressurization. Nisin (0, 12.055, 100 and 200 ppm) and glucono-delta-lactone (GdL; 0 and 1%) were added to MRPM. Vacuum-packaged samples were treated at 350 or 450 MPa and 2°C for 15 min using both continuous pressurization and three-cycle oscillatory pressurization for 5 min per cycle. In some samples a reduction of mesophile counts between 3.0544 and 5.0538 log cfu g−1was found. Psychrotrophes seemed to be more sensitive; in samples with 100 ppm of nisin and GdL treated at 450 MPa with cycles they were reduced to undetectable levels (a lethality of approximately 7.055 log units). Cycle pressurization showed slightly better results than continuous pressurization. The combination of 350 MPa, 100 ppm of nisin and 1% of GdL was enough to extend the shelf life of MRPM during the 30 day chilled storage. |
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