Salmonella enterica serovar Enteritidis and Listeria monocytogenes in mango (Mangifera indica L.) pulp: growth, survival and crosscontamination

摘要

BACKGROUND: This study examined the ability of Salmonella enterica serovar Enteritidis and Listeria monocytogenes to grow or survive in mango pulp stored at 20pC, 4pC, 10pC and 25pC, as well as to crosscontaminate mangoes by means of a knife contaminated with different levels of these pathogens. RESULTS: At 25pC lag phase durations of 19 h and 7.2 h and generation times of 0.66 and 1.44 were obtained, respectively, for S. Enteritidis and L. monocytogenes. At 10pC only the growth of L. monocytogenes was observed. At 4pC both bacteria survived for 8 days. At 20pC S. Enteritidis was able to survive for 5 months while L. monocytogenes survived for 8 months. Crosscontamination was observed for knives contaminated with 10e, 10e and 10t CFU mLp# of S. Enteritidis and 10e and 10e CFU mLp# of L. monocytogenes. CONCLUSION: Both microorganisms can grow well in mango pulp at 25pC, thus lower temperatures for the maintenance of the pulps are crucial to avoid growth of these microorganisms. A refrigeration temperature of 10pC will avoid only the growth of S. Enteritidis. Thus good handling practices should be rigidly enforced to avoid any contamination as even at refrigeration and freezing temperatures survival of these pathogens may occur. pb 2014 Society of Chemical Industry