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- Title
Identification of Insecticidal Constituents from the Essential Oil from the Aerial Parts Stachys riederi var. japonica.
- Authors
Quan, Meirong; Liu, Qi Zhi; Liu, Zhi Long
- Abstract
The essential oil of <italic>Stachys riederi</italic> var. <italic>japonica</italic> (Family: Lamiaceae) was extracted by hydrodistillation and determined by GC and GC-MS. A total of 40 components were identified, representing 96.01% of the total oil composition. The major compounds in the essential oil were acetanisole (15.43%), anisole (9.43%), 1,8-cineole (8.07%), geraniol (7.89%), eugenol (4.54%), caryophyllene oxide (4.47%), caryophyllene (4.21%) and linalool (4.07%). Five active constituents (acetanisole, anisole, 1,8-cineole, eugenol and geraniol) were identified by bioactivity-directed fractionation. The essential oil possessed fumigant toxicity against maize weevils (<italic>Sitophilus zeamais</italic>) and booklice (<italic>Liposcelis bostrychophila</italic>), with LC50 values of 15.0 mg/L and 0.7 mg/L, respectively. Eugenol and anisole exhibited stronger fumigant toxicity than the oil against booklice. 1,8-Cineole showed stronger toxicity, and anisole as well as eugenol exhibited the same level of fumigant toxicity as the essential oil against maize weevils. The essential oil also exhibited contact toxicity against <italic>S. zeamais</italic> adults and <italic>L. bostrychophila</italic>, with LC50 values of 21.8 µg/adult and 287.0 µg/cm2, respectively. The results indicated that the essential oil of <italic>S. riederi</italic> var. <italic>japonica</italic> and its isolates show potential as fumigants, and for their contact toxicity against grain storage insects.
- Subjects
INSECTICIDES; NEONICOTINOIDS; ESSENTIAL oils; STACHYS; BIOACTIVE compounds; ANISOLE
- Publication
Molecules, 2018, Vol 23, Issue 5, p1200
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules23051200