Insecticidal Bufadienolides from The Leaves of Kalanchoe daigremontiana (Crassulaceae)

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ID: 171911
2010
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Abstract
Kalanchoe is the biggest genera of Crassulaceae family and distributed in tropical and subtropical regions. This genera is found to be a rich source of biologically active natural products such as triterpenes, flavonoids and steroids. As a part of our continuing search for novel insecticidal compounds from Indonesian Kalanchoe plants, we examined Kalanchoe daigremontiana collected from Bandung region, West Java, Indonesia. The methanolic extract of the dried leaves of K. daigremontiana was concentrated and extracted with methylene chloride The methylene chloride extract exhibited an insecticidal activity toward silkworms. The methylene chloride extract was partitioned between n-hexane and methanol containing 10% water. The active lower layer was extracted with ethyl acetate. By using the insecticidal activity to follow the separations, the ethyl acetate fraction was separated by combination of column chromatography on Kieselgel 60 and ODS to afford two insecticidal bufadienolides 1 and 2. The structures of these compounds were elucidated based on spectroscopic analysis (UV, IR, NMR, 2D-NMR) and comparison with those related data previously reported. In this paper, the isolation, structural elucidation, and insecticidal activities against the third instar larvae of silkworm will be described.
Reference Key
hermawan2010insecticidaljurnal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Hermawan, Wawan;Maharani, Rani;Fajriah, Sofa;Hardiawan, Revan;Supratman, Unang;
Journal jurnal ilmu dasar
Year 2010
DOI
DOI not found
URL
https://jurnal.unej.ac.id/index.php/JID/article/view/72
Keywords
chemistry Organic Chemistry Biology (General) Medicine Information technology Science neurosciences. biological psychiatry. neuropsychiatry

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