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Molecules 2012, 17(10), 12049-12060; doi:10.3390/molecules171012049
Article

Identification of Insecticidal Constituents of the Essential Oil of Curcuma wenyujin Rhizomes Active against Liposcelis bostrychophila Badonnel

1,* , 1, 1, 2 and 3,*
1 Department of Entomology, China Agricultural University, Haidian District, Beijing 100193, China 2 Department of Plant Pathology, China Agricultural University, Haidian District, Beijing 100193, China 3 College of Resources Science and Technology, Beijing Normal University, Haidian District, Beijing 100875, China
* Authors to whom correspondence should be addressed.
Received: 7 August 2012 / Revised: 8 October 2012 / Accepted: 9 October 2012 / Published: 15 October 2012
(This article belongs to the Section Metabolites)
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Abstract

The aim of this research was to determine the chemical composition and insecticidal activity of the essential oil of Curcuma wenyujin Y.H. Chen et C. Ling rhizomes against the booklouse Liposcelis bostrychophila Badonnel and to isolate any insecticidal constituents from the essential oil. The essential oil of C. wenyujin rhizomes was obtained by hydrodistillation and analyzed by GC-MS. A total of 43 components of the essential oil were identified and the principal compounds in the essential oil were 1,8-cineole (15.26%), camphor (10.12%), germacrone (6.86%), β-elemene (6.33%), curzerene (6.70%), and β-elemenone (5.23%). followed by curzerenone (4.52%), curdione (4.45%) and linalool (4.43%). Based on bioactivity-guided fractionation, the two main active constituents were isolated from the essential oil and identified as 1,8-cineole and camphor. The essential oil of C. wenyujin rhizomes exhibited contact toxicity against L. bostrychophila with an LD50 value of 208.85 µg/cm2. Camphor (LD50 = 207.26 µg/cm2) exhibited stronger contact toxicity than 1,8-cineole (LD50 = 1048.75 µg/cm2) against booklouse. The essential oil of C. wenyujin (LC50 = 2.76 mg/L air) also possessed fumigant toxicity against L. bostrychophila, while the two constituents, camphor and 1,8-cineole had LC50 values of 1.03 mg/L air and 1.13 mg/L air, respectively. The results indicate that the essential oil of C. wenyujin rhizomes and its constituent compounds have potential for development as natural insecticides or fumigants for control of insects in stored grains.
Keywords: Liposcelis bostrychophila; Curcuma wenyujin; contact toxicity; fumigant; essential oil composition; 1,8-cineole; camphor Liposcelis bostrychophila; Curcuma wenyujin; contact toxicity; fumigant; essential oil composition; 1,8-cineole; camphor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Liu, Z.L.; Zhao, N.N.; Liu, C.M.; Zhou, L.; Du, S.S. Identification of Insecticidal Constituents of the Essential Oil of Curcuma wenyujin Rhizomes Active against Liposcelis bostrychophila Badonnel. Molecules 2012, 17, 12049-12060.

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