Abstract
By the application of HHP; 5.50 and 5.70 log cycle reduction was obtained for S. aureus 485, in milk and cream of chicken soup samples, respectively. Storage of HHP treated milk samples for 24 h at 4 °C gave positive result for S. aureus 765 where no growth was observed for L. monocytogenes strains. Incubation of food samples for an additional 48 h at 37 °C showed growth of L. monocytogenes strains as S. aureus strains. When a bacteriocin-based biopreservative (BP 1 ) was combined with pressurization more than 8 log-cycle reduction in cell population of the resistant strains of S. aureus and L. monocytogenes was achieved in milk. Milk and cream of chicken soup samples were stored at 25 °C and milk samples showed no growth up to 30 day where as Gram-positive bacterial strains in cream of chicken showed growth after 3 days with a rapid increase in cell number thereafter.
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