EFFECT of OXYRASE ON GROWTH of SALMONELLA spp. and LISTERIA MONOCYTOGENES IN the "UNIVERSAL PREENRICHMENT MEDIUM"

The importance of Salmonella and Listeria monocytogenes in food safety is well-known. Recovery of these organisms is usually done in different types of enrichment broths. Recently Bailey and Cox (1992) reported the development of a "Universal Preenrichment Medium" capable of recovering both Salmonella and Listeria monocytogenes , thus eliminating the need of using two broths to enrich these important foodborne pathogens. In our laboratory we have ascertained that Oxyrase, an oxygen scavenger, is able to allow the rapid growth of Listeria monocytogenes and other Listeria spp. (Yu and Fung 1991a) as well as other facultative anaerobic foodborne pathogens (Yu and Fung 1991b). It seems reasonable that Oxyrase will be able to stimulate growth of Salmonella spp. and Listeria monocytogenes in the "Universal Preenrichment Medium." the purpose of this investigation was to ascertain the stimulatory capability of Oxyrase on Salmonella spp. and Listeria monocytogenes in the "Universal Preenrichment Medium."