Antimicrobial Effects of Alginate-Based Films Containing Essential Oils on Listeria monocytogenes and Salmonella Typhimurium Present in Bologna and Ham
2007
Oussalah, M. | Caillet, S. | Salmieri, S. | Saucier, L. | Lacroix, M.
Bologna and ham slices (300 of each) were inoculated with Salmonella Typhimurium or Listeria monocytogenes at 10³ CFU/cm2. Alginate-based edible films that had been immersed in a 2 or 20% (wt/vol) CaCl2 solution and contained 1% (wt/vol) essential oils of Spanish oregano (O; Corydothymus capitatus), Chinese cinnamon (C; Cinnamomum cassia), or winter savory (S; Satureja montana) were then applied to slices to control pathogen growth. On bologna, C-based films pretreated with 20% CaCl2 were the most effective against the growth of Salmonella Typhimurium and L. monocytogenes. L. monocytogenes was the more sensitive bacterium to O-, C-, and S-based films. L. monocytogenes concentrations were below the detection level (<10 CFU/ml) after 5 days of storage on bologna coated with O-, C-, or S-based films pretreated with 20% CaCl2. On ham, a 1.85 log CFU/cm2 reduction of Salmonella Typhimurium (P <or= 0.05) was found after 5 days of storage with C-based films regardless of the type of pretreatment used (2 or 20% CaCl2) or when coated with O-based films pretreated with 20% CaCl2. L. monocytogenes was highly resistant in ham, even in the presence of O-, C-, or S-based films. However, C-based films pretreated with 20% CaCl2 were the most effective against the growth of L. monocytogenes. Evaluation of the availability of active compounds in films revealed a significantly higher release of active compounds in C-based films (P <or= 0.05) regardless of pretreatment or meat tested (bologna or ham). O-based films had the lowest release level of active compounds. The release of active compounds from O- and S-based films pretreated with 20% CaCl2 was faster than that in the same respective films pretreated with 2% CaCl2 regardless of the meat type. C-based film pretreated by immersion in a 20% CaCl2 solution was most efficient against both pathogens, and migration of active compounds was higher in C-based films than in O- and S-based films.
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