title: Identification of repellent odorants to the body louse, Pediculus humanus corporis, in clove essential oil.
abstract: The control of body lice is an important issue for human health and welfare because lice act as vectors of disease such as typhus, relapsing fever, and trench fever. Body lice exhibit avoidance behavior to some essential oils, including clove essential oil. Therefore, odorants containing clove essential oil components may potentially be useful in the development of repellents to body lice. However, such odorants that induce avoidance behavior in body lice have not yet been identified from clove essential oil. Here, we established an analysis method to evaluate the avoidance behavior of body lice to specific odorants. The behavioral analysis of the body lice in response to clove essential oil and its constituents revealed that eugenol, a major component of clove essential oil, has strong repellent effect on body lice, whereas the other components failed to induce obvious avoidance behavior. A comparison of the repellent effects of eugenol with those of other structurally related odorants revealed possible moieties that are important for the avoidance effects to body lice. The repellent effect of eugenol to body lice was enhanced by combining it with the other major component of clove essential oil, β-caryophyllene. We conclude that a synthetic blend of eugenol and β-caryophyllene is the most effective repellent to body lice. This finding will be valuable as the potential use of eugenol as body lice repellent.
authors: Department of Advanced Interdisciplinary Studies, Graduate School of Engineering, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8904, Japan.|Japan Society for the Promotion of Science (JSPS) Research Fellow, Kojimachi Business Center Building, Chiyoda, Tokyo, 102-0083, Japan.
authors: Takuma
authors: T
authors: Iwamatsu
authors: Department of Advanced Interdisciplinary Studies, Graduate School of Engineering, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8904, Japan.
authors: Daisuke
authors: D
authors: Miyamoto
authors: Research Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8904, Japan.
authors: Hidefumi
authors: H
authors: Mitsuno
authors: Osaka Pharmaceutical Co., Ltd, Hondori 3-2-4, Takaida, Higashioosaka, Osaka, 577-0066, Japan.
authors: Yoshiaki
authors: Y
authors: Yoshioka
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-8657, Japan.|Department of Biological Production, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Saiwai-cho 3-5-8, Fuchu, Tokyo, 183-8509, Japan.
authors: Takeshi
authors: T
authors: Fujii
authors: Research Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8904, Japan.
authors: Takeshi
authors: T
authors: Sakurai
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-8657, Japan.
authors: Yukio
authors: Y
authors: Ishikawa
authors: Department of Advanced Interdisciplinary Studies, Graduate School of Engineering, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8904, Japan. kanzaki@rcast.u-tokyo.ac.jp.|Research Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8904, Japan. kanzaki@rcast.u-tokyo.ac.jp.
authors: Ryohei
authors: R
authors: Kanzaki
mesh_terms: D000818:Animals; D045783:Clove Oil / Q000737:chemistry / Q000494:pharmacology*; D005054:Eugenol / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D009822:Oils, Volatile / Q000494:pharmacology; D010374:Pediculus / Q000187:drug effects*; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes / Q000737:chemistry / Q000494:pharmacology*; D027842:Syzygium / Q000737:chemistry*
chemical_list: D045783:Clove Oil; D009822:Oils, Volatile; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; D005054:Eugenol; C024714:caryophyllene
keywords: Behavior analysis; Body lice; Eugenol; Synergistic effect