Phytotoxic and Nematicidal Components of Lavandula luisieri

Abstract

Several preparations were obtained from the aerial parts of predomesticated Lavandula luisieri, including the essential oil and ethanolic, hexane, and ethyl acetate extractives. Additionally, pilot plant vapor pressure extraction was carried out at a pressure range of 0.5-1.0 bar to give a vapor pressure oil and an aqueous residue. A chemical study of the hexane extract led to the isolation of six necrodane derivatives (1, 2, and 4-7), with four of these (1, 2, 5, and 7) being new, as well as camphor, a cadinane sesquiterpene (9), tormentic acid, and ursolic acid. The EtOAc and EtOH extracts contained a mixture of phenolic compounds with rosmarinic acid being the major component. Workup of the aqueous residue resulted in the isolation of the necrodane 3 and (1R*,2S*,4R*)-p-menth-5-ene-1,2,8-triol (8), both new natural compounds. The structures of the new compounds were established based on their spectroscopic data. The phytotoxic and nematicidal activities of these compounds were evaluated.

Chemical Composition and Biological Activities of Artemisia pedemontana subsp. assoana Essential Oils and Hydrolate

“…Candial [11], Lavandula x intermedia var. super [37], L. luisieri [25,37], and two species of Thymus [37] against M. javanica . However, further research is needed in order to characterize the nematicidal components present in the active hydrolate of A. pedemontana subsp.…”

“…The experiments were conducted with Lactuca sativa cv. Teresa (Fitó, Selva de Mar, Barcelona, Spain), and Lolium perenne (Batlle, Molins de Rei, Barcelona, Spain) seeds, as described [25]. Briefly, 2.5 cm diameter filter paper with 20 µL of the test solution (10 µg/µL for EOs, 5 µg/µL for pure compounds) were placed on 12-well plates (Falcon, Corning, NY, USA) and then 500 µL H 2 O/well and 10/5 seeds ( L. sativa / L. perenne pre-soaked in distilled water for 12 h) were added.…”

Supercritical Carbon Dioxide Antisolvent Fractionation for the Sustainable Concentration of Lavandula luisieri (Rozeira) Riv.- Mart Antimicrobial and Antioxidant Compounds and Comparison with Its Conventional Extracts

“…This plant was adapted to the Cariñena experimental field in 2008 from a Toledo (Spain) wild population. It was cultivated and collected as reported by Julio et al, [34]. Plant material was dried at room temperature, pulverised and sieved.…”

Sesquiterpene Lactones from Artemisia absinthium. Biotransformation and Rearrangement of the Insect Antifeedant 3α-hydroxypelenolide

“…According to Buchanan et al [ 45 ], the C-3 and C-4 sterochemistry of cadine-4,10 (15)-dien-3-one derivatives, have an important effect on the insecticidal properties of these compounds, decreasing the activity when the C-4 configuration is R and when the stereochemistry of the 3α-hydroxyl is reversed. Cadinane-type sesquiterpenes also showed antigermination and phytotoxic activity against lettuce and radish seeds [ 45 , 47 , 48 ]. However, 10 was not phytotoxic in our experiments.…”