LACTIC FLORA-LISTERIA MONOCYTOGENES INTERACTION

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S. Colombo *
M. Romani
C. Romani
(*) Corresponding Author:
S. Colombo | lucia.zoppi@pagepress.org

Abstract

The EC Regulation 2073/2005 (1) requires that food processors evaluate the capability of ready-to-use (RTE) products to support the development of Listeria monocytogenes when their pH and aW values are favourable to the growth of this microorganism. It is renown that the lactic flora plays an important role in many different foods, both from a technological and a food safety standpoint. This study was aimed to observe the behaviour and the potential anti-Listeria effect of some natural lactic flora present in Italian liver patè crostini (chicken heart and liver, anchovies, onions, capers, starch, no added preservatives) through the Combase Predictor – Max Growth Rate predictive software. The natural lactic flora of the crostini demonstrated a variable capability to inhibit the growth of Listeria monocytogenes which depends upon : the concentration of the lactic flora at the beginning of the shelf life period and the subsequent lag phase, the possible release of anti-Listeria substances, and the maximum growth rate.

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