title: Analysis of the essential oil of Illicium henryi Diels root bark and its insecticidal activity against Liposcelis bostrychophila Badonnel.
abstract: Water-distilled essential oil from Illicium henryi (Illiciaceae) root bark was analyzed by gas chromatography-mass spectrometry. Thirty-four compounds, accounting for 97.86% of the total oil, were identified. The main components of the essential oil of I. henryi root bark were safrole (46.12%), myristicin (20.39%), and 1,8-cineole (6.17%), followed by α-cadinol (3.784%) and linalool (3.22%). The essential oil had higher levels of phenylpropanoids (66.89%) than of monoterpenoids (14.83%) and sesquiternoids (16.14%). Three constituents were isolated from the oil based on bioactivity fractionation. The essential oil possessed fumigant toxicity against booklice (Liposcelis bostrychophila), with a 50% lethal concentration (LC50) of 380.39 μg/liter of air, while the two isolated constituents myristicin and safrole had LC50s of 121.95 and 322.54 μg/liter, respectively. Another constituent, 1,8-cineole, showed weaker toxicity, with an LC50 of 1,120.43 μg/liter. The essential oil also exhibited contact toxicity against L. bostrychophila, with an LC50 of 96.83 μg/cm(2). Myristicin (LC50, 18.74 μg/cm(2)) and safrole (LC50, 69.28 μg/cm(2)) exhibited stronger acute toxicity than 1,8-cineole (LC50, 1,049.41 μg/cm(2)) against the booklice. The results indicated that the essential oil and its constituent compounds have potential for development into natural insecticides for control of psocids in stored grains.
authors.affiliation: Department of Entomology, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing, People's Republic of China 100193.
authors.forename: Xin Chao
authors.initials: XC
authors.lastname: Liu
authors.affiliation: Department of Entomology, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing, People's Republic of China 100193. zhilongliu@cau.edu.cn.
authors.forename: Zhi Long
authors.initials: ZL
authors.lastname: Liu
mesh_terms: D000080462:Acyclic Monoterpenes; D000081248:Allylbenzene Derivatives; D000818:Animals; D001593:Benzyl Compounds / Q000737:chemistry; D003511:Cyclohexanols / Q000737:chemistry; D004148:Dioxolanes / Q000737:chemistry; D000077591:Eucalyptol; D008401:Gas Chromatography-Mass Spectrometry; D029523:Illicium / Q000737:chemistry*; D007313:Insecta; D007306:Insecticides / Q000737:chemistry*; D007928:Lethal Dose 50; D039821:Monoterpenes / Q000737:chemistry; D009822:Oils, Volatile / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D011748:Pyrogallol / Q000031:analogs & derivatives / Q000737:chemistry; D012451:Safrole / Q000737:chemistry; D013729:Terpenes / Q000737:chemistry
chemical_list: D000080462:Acyclic Monoterpenes; D000081248:Allylbenzene Derivatives; D001593:Benzyl Compounds; D003511:Cyclohexanols; D004148:Dioxolanes; D007306:Insecticides; D039821:Monoterpenes; D009822:Oils, Volatile; D010938:Plant Oils; D013729:Terpenes; C445364:cadinol; D011748:Pyrogallol; C005246:myristicin; C018584:linalool; D012451:Safrole; D000077591:Eucalyptol