| | 1 | Author
| H.-OK. Alinow, C. K. Rack3, K. E. Rm Elb, H. Riath, Am Jareeb | Requires cookie* | | | Title
| Isolation and Characterization of l-Tigloyl-3-acetylazadirachtol from the Seed Kernels of the Thai Neem Azadirachta siamensis Valeton  | | | | Abstract
| The Thai neem A. siamensis (Valeton) is the main source for botanical insecticides in Thailand. Although azadirachtin A (aza A) is present in Thai neem, there are som e other related compounds which may contribute to its bioefficiency. Analytical HPLC of Thai neem samples showed a peak closely eluted with azadirachtin. A large-scale cleanup involving two liquid/liquid extraction steps, silica filtration, and finally two successive preparative HPLC separations, resulted in the pure compound, which was identified as l-tigloyl-3-acetylazadi-rachtol by ID -and 2D -'H and 13C NM R spectroscopy. | | | |
Reference
| Z. Naturforsch. 52b, 1413—1417 (1997); received August 4 1997 | | | |
Published
| 1997 | | | |
Keywords
| Thai N eem, Azadirachtin, Limonoids, NM R Spectra, Structure | | | |
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| default:Reihe_B/52/ZNB-1997-52b-1413.pdf | | | | Identifier
| ZNB-1997-52b-1413 | | | | Volume
| 52 | |
| 2 | Author
| Heinz Rem, K. Laus-, Peter Sieber | Requires cookie* | | | Title
| Inhibition of Oogenesis and Ovarian Ecdysteroid Synthesis by Azadirachtin in Locusta migratoria migratorioides (R. & F.) | | | | Abstract
| The sterilizing effect of azadirachtin, an insect growth regulator from the neem tree, Azadirachta indica A. Juss, was tested with mature females o f Locusta migratoria. After a single injection of 10 |ig into females between 2 and 13 days after emergence, about 60% died during the following four days and all lost weight in the range of about 50%. If the compound was injected into animals of an age between 2 and 10 days, no maturation o f the terminal oocytes could be observed. Injection at an age between 10 and 13 days after adult emergence resulted in ovaries which contained almost mature oocytes. Most o f the treated locusts had no oviposition and only traces of ecdysteroids were present in their ovaries, as quantified by radioimmunoassay. The inhibition of oogenesis and o f ovarian ecdysteroid synthesis by azadirachtin is discussed on the basis of its interference with the neuroendocrine control of hormone synthesis. | | | |
Reference
| Z. Naturforsch. 36c, 466 (1981); received November 10 1980/February 23 1981 | | | |
Published
| 1981 | | | |
Keywords
| Locusta migratoria, Azadirachta indica, Ecdysteroids, Azadirachtin, Ovary | | | |
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| default:Reihe_C/36/ZNC-1981-36c-0466.pdf | | | | Identifier
| ZNC-1981-36c-0466 | | | | Volume
| 36 | |
| 3 | Author
| EloiS. Garcia, Patricia De Azambuja, Hans Forster, Heinz Rembold | Requires cookie* | | | Title
| Feeding and Molt Inhibition by Azadirachtins A, B, and 7-Acetyl-azadirachtin A in Rhodnius prolixus Nymphs | | | | Abstract
| Development The antifeedant and antimolting effects of azadirachtins A and B, and of a synthetic derivative, 7-acetyl-azadirachtin A were examined. Given through a blood meal, the effective dose (E D 50) for the antifeedant effect ranged from 25 to 30 ng/ml of blood for the three compounds. ATP, a phagostimulant, also given orally, reversed the antifeedant action of azadirachtin A. The ED50 values for molt inhibition were 0.04, 0.015, and 0.45 (ig/ml of blood for azadirachtins A, B, and 7-acetyl-azadirachtin A, respectively. The mechanisms of feeding and molt inhibitions by azadirachtin A B, and its 7-acetyl-azadirachtin A derivative are discussed. | | | |
Reference
| Z. Naturforsch. 39c, 1155—1158 (1984); received July 5/September 5 1984 | | | |
Published
| 1984 | | | |
Keywords
| Rhodnius prolixus, Azadirachta indica, Azadirachtin, Antifeedant, Molt Inhibition, Ecdysis | | | |
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| default:Reihe_C/39/ZNC-1984-39c-1155.pdf | | | | Identifier
| ZNC-1984-39c-1155 | | | | Volume
| 39 | |
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