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        Chemical analysis of the female sex pheromone in Palpita nigropunctalis (Lepidoptera: Crambidae)

        Qi Yan,Aguri Fujino,Hideshi Naka,Shuang-Lin Dong,Tetsu Ando 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.4

        The lilac pyralid, Palpita nigropunctalis Bremer (Lepidoptera: Crambidae), is a common pest of Oleaceae plants. A crude extract of the female sex pheromone glands was examined by gas chromatography-electroantennogram detection (GC-EAD) and GC coupled to a mass spectrometer (GC/MS). The GC-EAD analysis revealed three EAGactive components (I–III) in a ratio of 1:0.2:0.01 (I: II: III). GC/MS analysis successfully recorded the mass spectra of I and II. For I, ions at m/z 238 (M + ) and 220 ([M-18] + ) indicated the structure of a monoenyl aldehyde with a 16-carbon chain. For II, M + was not detected, but ions at m/z 222 ([M-60] + ) and 61 ([AcOH +1] + ) suggested that II was a monoenyl acetate with a 16-carbon chain. Further GC/MS analysis of the extract treated with dimethyl disulfide revealed that the double bonds in both I and II are located at the same position of 11th-carbon. In addition, the pheromone extract was examined by GC/Fourier transform-infrared spectrophotometer (GC/FT-IR). An IR spectrum of I showed characteristic absorption at 1716 and 966 cm −1 , indicating a formyl group and E configuration of the double bond, respectively. In the case of II, absorption at 1745 and 968 cm −1 indicated an ester carbonyl and E configuration, respectively. Taken together and by comparison with authentic standards, I and II were confirmed as (E)-11-hexadecenal and (E)-11-hexadecenyl acetate, respectively; while III was speculated as (E)-11-hexadecen-1-ol. The synthetic I, II and III all coincided well with those of the natural components in chemical data, and elicited strong electroantennographic activity in male P. nigropunctalis.

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