Chemical Constituents and Activity of Murraya microphylla Essential Oil against Lasioderma serricorne

Abstract

The chemical composition, contact and repellent activities of the essential oil from Murraya microphylla branches and leaves against Lasioderma serricorne adults were determined and six compounds from the essential oil were isolated as well. The essential oil of M. microphylla obtained by hydrodistillation was analyzed by gas chromatography-mass spectrometric (GC-MS) analysis; 22 compounds were identified. The main constituents of the essential oil included β-caryophyllene (18.0%), α-pinene (13.8%), spathulenol (9.5%), α-humulene (6.0%), γ-elemene (5.1%) and zingiberene (4.6%), followed by α-cadinol (3.9%) and caryophyllene oxide (3.8%). Six of these compounds were isolated and fully identified as α-pinene, β-caryophyllene, α-humulene, caryophyllene oxide, spathulenol and α-cadinol. L. serricorne adults had different sensitivities to the crude essential oil and isolated compounds. α-Humulene exhibited the strongest contact activity against L. serricorne, showing an LD 50 value of 13.1 μg adult-1. However, spathulenol, the crude essential oil and α-cadinol showed stronger contact activity against L. serricorne than caryophyllene oxide and β-caryophyllene. The essential oil, α-humulene and spathulenol showed comparable repellency against L. serricorne adults at 2 h after exposure, relative to the positive control, DEET. The results demonstrate that the essential oil and isolated compounds exhibited important contact and repellent activities against L. serricorne. Thus, they could become potential natural insecticides or repellents for control of insects in stored products.

β-Elemene Selectively Inhibits the Proliferation of Glioma Stem-Like Cells Through the Downregulation of Notch1

“…Similar to artemisinin (a famous Chinese herb, the discovery of which led to a Nobel prize in 2015), bELE is also extracted from plants and has a known molecular structure. bELE was found to be a major component of leaf oil from Piper majusculum Blume , oil of Elephantomyia longirostris from leaves, stems, roots, and fruits, Syzygium zeylanicum leaves, and the ethanol extract of Drosera regia []. bELE was reported to exhibit acute toxicity toward mosquito larvae, efficiently inhibiting inflammation [, ].…”

Analysis of the Essential Oils ofEucalyptus camaldulensisDehnh. andE. viminalisLabill. as a Contribution to Fortify Their Insecticidal Application

“…The insecticidal activities of essential oils are closely related to their components, especially terpenes. [28][29][30][31] Insecticidal effects of the high percentage components identified in the current study are listed in Table 5; monoterpene hydrocarbons (p-cymene and α-pinene) and oxygenated monoterpenoids (1,8-cineole, cuminaldehyde, linalool, phellandral, terpinen-4-ol, pinocarveol, and α-terpineol), are recognized in the essential oils of E. camaldulensis and E. viminalis, indicated promising insecticidal effects against different groups of pests. Indeed, high vapor pressures of monoterpenes candidate them for application in greenhouse and storage conditions as fumigant pesticides.…”

“…28,34 Due to lower vapor pressures, high contact toxicity, and moderate fumigant pesticidal activities of sesquiterpenes, such as aromadendrene and spathulenol identified in the present research, were also reported. 31,35 Consequently, the promising fumigant toxicity of E. camaldulensis and E. viminalis essential oils may be associated with high percentages of the above-mentioned monoterpenes. However, synergistic, additive, and antagonistic effects all components should be considered in the essential oil activities.…”

“…However, synergistic, additive, and antagonistic effects all components should be considered in the essential oil activities. 29,31…”

“…30 Spathulenol Toxicity and repellency against the adults of Lasioderma serricorne (F.). 31 Terpinen-4-ol…”