NoteAntifeedants against Aeusta despesta Cryptomeria 1 ' aponica II fromthe Japanese Cedar , jSBA
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چکیده
± S.E.)6) was chromatographed on a silica gel colurnn to separate it into the 100% hexane, 20% AcOEtl hexane, 50% AcOEtlhexane and 100% AcOEt frs. The bioassay results clearly confirmed that the active component(s) in the original hexane fr. were concentrated in the 20% AcOEtfhexane fr. (92,4%± 1.6). The activities of the other frs. were as follows: 100% hexane fr. (O.O%± O.O), 50% AcOEt!hexane fr, (35.6% ± 1.3) and 100% AcOEt fr. (28.1%± 1,5), The mean values for the antifeeding acitiyity against A. despesta of the original hexane and 20% AcOEt! hexane frs, were not significantly different a p = O.O1 by ANOP'L4 and the Duncan multiple-range test. Next, according to the retention times, the active 20% AcOEtlhexane fr. was separated intQ seven fTs. (Frs. A-G) by HPLC. Of these seven frs., Frs. D (88.1% ± 1.1) and F (91.7% ± 1.3) both showed high activity. The other frs, (A, 21.2% ± 4.1; B, 50,8% ± 3.6; C, 19.6% ± 3.8; E, 46.0% ± 1,2; and G, 32.9%
منابع مشابه
Antifeedants against Acusta despesta from the Japanese cedar, Cryptomeria japonica.
During our studies on the components in Japanese cedar, Cryptomeria japonica, we found that the crude methanol extract of C. japonica showed intense antifeeding activity against one snail species, Acusta despesta, which is well-known as a pest of many vegetables and crops. The active components in the extract were separated into the hexane and ethyl acetate soluble fractions. From the active et...
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