Microbiological stability of canned tuna produced in Italy and in non-European countries

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Francesco Casalinuovo *
Teresa Gazzotti
Paola Rippa
Lucia Ciambrone
Rosanna Musarella
Elena Pratticò
(*) Corresponding Author:
Francesco Casalinuovo | francesco.casalinuovo@cert.izsmportici.it

Abstract

The results of a study on the microbiological stability of canned tuna produced by Italian companies and similar canned products manufactured in countries outside Europe are reported herein. The study involved 38 samples of canned tuna of various brands, of which 14 were produced by companies outside Europe and 24 by Italian companies. Qualitative and quantitative microbiological tests were conducted for the following parameters: bacterial colony counts at 30°C, total coliforms, total Enterobacteriaceae, sulphite-reducing anaerobes, Salmonella spp., Bacillus cereus, Escherichia coli, Staphylococcus aureus, yeasts and molds. Bacterial loads and mold contamination were respectivelyin found in 8/14 (57%) samples from outside EU and 7/24 (29%) Italian samples. The bacterial flora was represented by Gram-positive bacteria (Staphylococcus warneri, Staphylococcus lentus, Streptococcus mitis, Enterococcus faecalis, Leuconostoc mesenteroides), Gram-negative bacteria (Sphingomonas paucimobilis, Acinetobacter iwoffii, Rhizobium radiobacter), spore-forming bacteria (Bacillus vallismortis), while the fungal species was represented by Penicillium spp., Rhizopus spp., Rhodotorula spp. and Alternaria spp. Excluding anomalies in the thermal treatment process of products and any contamination after treatment, the contaminations encountered in both cases were most likely due to insufficient production quality standards and the quality of the raw material used. These results may require a redefinition of the concept of commercial stability as hitherto stated.

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Author Biographies

Francesco Casalinuovo, Institute for Experimental Veterinary Medicine of Southern Italy, Catanzaro

Director Unit Complex Food Hygiene Institute Zooprofilattico of the South Section of Catanzaro

Teresa Gazzotti, Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell’Emilia (BO)

Researcher at the Department of Veterinary Medical Sciences, University of Bologna

Paola Rippa, Institute for Experimental Veterinary Medicine of Southern Italy, Catanzaro

Unit Complex Food Hygiene Institute Zooprofilattico of the South Section of Catanzaro

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