Insecticidal activities of Ruta chalepensis leavesisolated constituent and structure-relationships of its analogues against Sitophilus oryzae
2013
Jeon, Ju-Hyun | Kim, Min-gi | Lee, Hoi-Seon
The insecticidal activities of active component isolated from Ruta chalepensis L. (Rutales: Rutaceae) leaves and its derivatives were examined using fumigant and contact toxicity methods against rice weevil, Sitophilus oryaze L. (Coleoptera: Curculionidae) adults. Administering the chloroform fraction of the methanol extract resulted in 87.7% mortality at 1.02 mg/cm² against S. oryzae adults, using a fumigant method. The insecticidal constituent of R. chalepensis leaves was isolated by chromatographic techniques, and identified as quinoline-4-carbaldehyde (C₁₀H₇NO). Based on the LD₅₀ values, the most toxic compound against S. oryzae was quinoline (0.063 mg/cm²), followed by quinoline-4-carbaldehyde (0.084 mg/cm²), and quinoline-3-carbaldehyde (0.173 mg/cm²) using the fumigant method. In the contact method, the most active compound against S. oryzae was quinoline (0.057 mg/cm²), followed by quinoline-4-carbaldehyde (0.065 mg/cm²), and quinoline-3-carbaldehyde (0.092 mg/cm²). Changing the position of aldehyde groups in the quinoline skeleton increases the insecticidal activities against S. oryzae. Furthermore, these results suggest that naturally occurring quinoline-4-carbaldehyde and its derivatives could have potential for managing populations of insect pests affecting stored food products.
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