Journal
MOLECULES
Volume 25, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/molecules25092225
Keywords
Lavandula x intermedia; lavandin aromatic waters; hydrosol; hydrolate; fingerprinting analysis; insect repellence; germination inhibitors; multifunctional agriculture
Funding
- Italian Ministry of Education, University and Research (MIUR) (PRIN Project 2015 BIOPIC, 2015 BABFCF)
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The present work evaluates for the first time two Lavandin (Lavandula x intermedia Emeric ex Loisel.) aromatic waters obtained from different plant organs, the flowers and the stems. Both extracts were analysed by GC-MS, which indicates semi-quantitative differences between the major metabolites including linalool, 1,8-cineole, camphor, linalyl acetate and 4-terpineol. H-1-NMR and LC-MS investigation confirmed the presence of these compounds. Moreover, behavioural tests with the food insect pest Tribolium confusum (Coleoptera Tenebrionidae) showed a good repellency for both hydrosols extracts with RD50 values of 3.6 and 3.3 mu Lcm(-2) for the flowers and stems, respectively; at the higher concentrations, however, the hydrosol extract from the flowers is expected to be more effective than the one from the stems. The effect of the flowers and stems aromatic water of Lavandin on seed germination of Raphanus sativus was also evaluated. Results showed that seed germination was completely inhibited by flowers hydrolate, having a possible application as natural herbicide. The overall experience with these Lavandin extracts indicates the potential of improved hydrolates to become the main distillation products, rather than by-products, of the aromatic plants manufacturing; this stimulates further discussions about the potential positive impacts that such a shift could have in the context of ecopharmacognosy.
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