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Effects of Fragrance Ingredients on the Uptake of Legionella pneumophila into Acanthamoeba castellanii.
Biocontrol Science 2018
Acanthamoeba castellanii, a ubiquitous organism in water environments, is pathogenic toward humans and also is a host for bacteria of the genus Legionella, a causative agent of legionellosis. Fragrance ingredients were investigated for their antibacterial activity against planktonic Legionella pneumophila, amoebicidal activity against A. castellanii, and inhibitory effect against L. pneumophila uptake into A. castellanii. Helional® exhibited relatively high antibacterial activity [minimum inhibitory concentration (MIC) , 32.0 μg/mL] . Anis aldehyde, canthoxal, helional® and vanillin exhibited amoebicidal activity (IC50 values, 58.4±2.0, 71.2±14.7, 66.8±8.3 and 49.1±2.5μg/mL, respectively) . L. pneumophila pretreatment with sub-MICs (0.25×MIC) of anis aldehyde, canthoxal, cortex aldehyde® 50 percent or vanillin evidently reduced L. pneumophila uptake into A. castellanii (p < 0.01) . Thus, fragrance ingredients were good candidates for disinfectant against L. pneumophila and A. castellanii.
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