GC-MS Analysis of Insecticidal Essential Oil of Aerial Parts of Paederia scandens (Lour) Merrill (Rubiaceae)
AbstractPurpose: To investigate the chemical composition and insecticidal activity of the essential oil of the aerial parts of Paederia scandens against the maize weevil, Sitophilus zeamais.
Methods: Steam distillation of the aerial parts of P. scandens was carried out using Clavenger apparatus in order to obtain the volatile oils. Gas chromatography/mass spectrometric (GC/MS) analyses (HP-5MS column) of the essential oil were performed and its composition determined. Insecticidal activity of the essential oil was measured following topical application and seal-spaced fumigation.
Results: The main components of the essential oil were β-pinene (24.77 %), α-pinene (8.22 %), 1, 8-cineol (8.01 %), δ-terpinene (5.32 %), (E)-β-ocimene (5.21 %), linalool (4.92 %) and 4-terpineol (3.63 %). The essential oil exhibited strong fumigant toxicity against adult S. zeamais with LC50 (lethal concentration at 50 %) value of 7.14 mg/L air. P. scandens essential oil also possessed contact toxicity against S. zeamais with LD50 (lethal dosage at 50 %) value of 47.78 µg/adult insect.
Conclusion: The study indicates that the essential oil of P. scandens has a potential for development into a natural fumigant for control of insects in stored grains.
Submission of a manuscript to this journal is a representation that the manuscript has not been published previously and is not under consideration for publication elsewhere.
All authors named in each manuscript would be required to sign a form (to be supplied by the Editor) so that they may retain their copyright in the article but to assign to us (the Publishers) and its licensees in perpetuity, in all forms, formats and media (whether known or created in the future) to (i) publish, reproduce, distribute, display and store the contribution, (ii) translate the contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or abstracts of the contribution, (iii) create any other derivative works(s) based on the contribution, (iv) to exploit all subsidiary rights in the contribution, (v) the inclusion of electronic links from the contribution to third party material where-ever it may be located, and (vi) license any thrid party to do any or all of the above.