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Behaviour of Listeria in the presence of silver fir and maritime pine essential oils

, : Behaviour of Listeria in the presence of silver fir and maritime pine essential oils. Sciences des Aliments 16(4): 403-411

The antimicrobial activity of fir and pine essential oils was tested against one strain of L. ivanovii, 27 strains of L. monocytogenes and 14 of L. innocua. Aromatic indices calculated from aromatograms by the disc method were in the 0.80-1 range, indicating that Listeria strains were sensitive to these two essential oils. The order of magnitude of that sensitivity is reproducible either at large intervals of time between two determinations or when the analysis is made independently by two technicians or with different batches of the essential oils. Aromatograms realised by the dilution method revealed that 0.28% and 1% of fir essential oil respectively inhibited and 'killed' about 10-5 cells of Listeria contained in 1 ml of liquid culture at 37 degree C. For pine essential oil, the concentrations were respectively 0.42 and 1%.

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