title: Repellent constituents of essential oil of Cymbopogon distans aerial parts against two stored-product insects.
abstract: The screening for bioactive principles from several Chinese medicinal herbs showed that the essential oil of Cymbopogon distans aerial parts possessed strong repellency against the booklouse, Liposcelis bostrychophila , and the red flour beetle, Tribolium castaneum . A total of 36 components of the essential oil were identified by GC and GC-MS. trans-Geraniol (16.54%), (R)-citronellal (15.44%), (+)-citronellol (11.51%), and α-elemol (9.06%) were the main components of the essential oil followed by β-eudesmol (5.71%) and (+)-limonene (5.05%). From the essential oil, four monoterpenes were isolated by bioassay-guided fractionation. The compounds were identified as limonene, citronellol, citronellal, and trans-geraniol. Geraniol and citronellol were strongly repellent against the booklouse, L. bostrychophila, whereas citronellal and limonene exhibited weak repellency against the booklouse. Geraniol and citronellol exhibited comparable repellency against the booklouse relative to the positive control, DEET. Moreover, geraniol and citronellol exhibited stronger repellency against the red flour beetle than DEET, whereas the two other compounds showed the same level of repellency against the red flour beetle compared with DEET.
authors.affiliation: Department of Entomology, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China.
authors.forename: Jing Song
authors.initials: JS
authors.lastname: Zhang
authors.forename: Na Na
authors.initials: NN
authors.lastname: Zhao
authors.forename: Qi Zhi
authors.initials: QZ
authors.lastname: Liu
authors.forename: Zhi Long
authors.initials: ZL
authors.lastname: Liu
authors.forename: Shu Shan
authors.initials: SS
authors.lastname: Du
authors.forename: Ligang
authors.initials: L
authors.lastname: Zhou
authors.forename: Zhi Wei
authors.initials: ZW
authors.lastname: Deng
mesh_terms: D000818:Animals; D031743:Cymbopogon / Q000737:chemistry*; D007302:Insect Repellents / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D007313:Insecta; D039821:Monoterpenes / Q000032:analysis / Q000302:isolation & purification; D009822:Oils, Volatile / Q000737:chemistry*; D014231:Tribolium
chemical_list: D007302:Insect Repellents; D039821:Monoterpenes; D009822:Oils, Volatile