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        검색결과 3

        1.
        2016.10 구독 인증기관·개인회원 무료
        Insecticidal toxicities of the isolated constituent of Eucalyptus dives oil and its analogues were bioassayed. 3-Carvomenthenone was isolated by chromatographic techniques and determined by EI-MS, 13C-NMR,1H-NMR, 1H-1H COSY, and HMQC. In the fumigant bioassay against P. interpunctella, cyclohexenone exhibited the strongest insecticidal toxicity (LD50 against larvae and adults, 2.45 and 3.63 μg/cm3), followed by methylcyclohexenone, seudenone, and 3-carvomenthenone. In the structure-activity relationships between 3-carvomenthenone analogues and insecticidal toxicity, the mode of the insecticidal action of 3-carvomenthenone, cyclohexenone, methylcyclohexenone, and seudenone was through the dermal organs of T. castaneum and P. interpunctella. This study indicates that 3-carvomenthenone, cyclohexenone, methylcyclohexenone, and seudenone have potential capacity for the development as safety natural agents to control the stored grain insects.
        2.
        2016.10 구독 인증기관·개인회원 무료
        The purpose of this study was to isolate an active constituent from the essential oil of Eugenia caryophyllata leaves and evaluate its insecticidal activity against Pochazia shantungensis nymphs and adults. According to chromatographic and spectroscopic analyses, the active constituent of E. caryophyllata leaves was identified as eugenol. Based on LC50 values and structural analogues of eugenola gainst the P. shantungensis nymphs and adults, isoeugenol (LC50, 83.29 and 91.03 mg/L) exhibited the highest insecticidal activity, followed by methyl isoeugenol (105.61 and 114.48 mg/L), eugenol (124.44 and 143.24 mg/L), methyl eugenol (126.31 and 143.84 mg/L), and acetyl eugenol (165.11 and 170.06 mg/L). Insecticidal activity against P. shantungensis was dependent on the presence of a functional group in 4-ally-2-methoxyphenol. These results indicate that E. caryophyllata oil and eugenol analogues might be potential alternative synthetic insecticidal agents.
        3.
        2016.10 구독 인증기관·개인회원 무료
        The essential oils of three Coriandrum sativum seeds cultivated from India, Russia and America were evaluated for acaricidal toxicities against Dermatophagoides farinae, D. pteronyssinus, and Tyrophagus putrescentiae. The oils of three C. sativum seeds were analyzed by gas chromatography. The oil of C. sativum seeds cultivated from India included substantially linalool (66.8%) and camphor (6.46%). In the fumigant bioassay, based on the LD50 values against D. farinae, D. pteronyssinus, and T. putrescentiae, the oil of C. sativum seeds cultivated from America (LD50, 2.62, 2.74, and 2.88 μg/cm3) was about 3.75, 3.32, and 4.17 times more active higher than benzyl benzoate (9.85, 9.10 and, 12.01 μg/cm3). The acaricidal activity of the oil of C. sativum seeds cultivated from India was 2.27, 2.03, and 2.64 times higher than that of the benzyl benzoate, followed by Russia oil. These results suggest that the oils of three C. sativum seeds might be used as suitable acaricides.