Food protective effect of geraniol and its congeners against stored food mites

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Abstract

The acaricidal activities of compounds derived from the oil of Pelargonium graveolens leaves against the storage food mite, Tyrophagus putrescentiae, were compared with the activity of a commercial acaricide, benzyl benzoate, in an impregnated fabric disk bioassay. Purification of the active constituent from P. graveolens was accomplished by silica gel chromatography and high-performance liquid chromatography. Structural analysis of the active constituent by 1H nuclear magnetic resonance (NMR)., 13C-NMR. 1H-13C shift correlated spectroscopy NMR, and distortionless enhancement by polarization transfer NMR identified trans;.v-3.7-dimethyl-2,6-octadien-l-ol (geraniol). Based on the 50% lethal dose values, the most toxic compounds against T. pittresceittiae were geraniol (1.95 μg/cm3), which was followed by nerol (2.21 μg/cm3), citral (9.65 μg/cm3), benzyl benzoate (I 1.27 μg/cm 3), and β-citronellol (15.86 μg/cm3). Our results suggest that geraniol is more effective in controlling T. putrescentiae than benzyl benzoate is. Furthermore, geraniol, which is used as a flavoring for beverages, candies, ice creams, and baked goods and congeners (citral and nerol). may be useful for managing populations of T. putrescentiae.

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Jeon, J. H., Lee, C. H., & Lee, H. S. (2009). Food protective effect of geraniol and its congeners against stored food mites. Journal of Food Protection, 72(7), 1468–1471. https://doi.org/10.4315/0362-028X-72.7.1468

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