stellera chamaejasme/dioxid de siliciu

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Isolation and identification of 2-isopropyl-5-methylphenol from Stellera chamaejasme and its insecticidal activity against Aphis craccivora and Pieris rapae.

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In this study, the root powder of Stellera chamaejasme was extracted with chloroform. The crude extract thus obtained was chromatographed several times with silica gel columns and finally one pure natural product was obtained. This product was identified as 2-isopropyl-5-methylphenol (thymol), which

New biflavanones and bioactive compounds from Stellera chamaejasme L.

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OBJECTIVE To study the chemical constituents of the root of Stellera chamaejasme L. METHODS Various column chromatographies on silica gel and RP-18 were employed for isolation and purification. Structures of compounds were elucidated by spectral analysis. RESULTS Eight lignans and three biflavonoids

Separation and identification of botanical insecticide 7-hydroxycoumarin and its biological activity against Aphis craccivora and Culex pipiens pallens.

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The root powder of Stellera chamaejasme was extracted with chloroform. The crude extract obtained was chromatographed with silica gel columns many times. One pure natural product was obtained. It was identified as 7-hydroxycoumarin. Laboratory bioassay showed that it had a good insecticidal activity

Purification and identification of carvacrol from the root of Stellera chamaejasme and research on its insecticidal activity.

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The root powder of Stellera chamaejasme was extracted with petroleum ether. The crude extract obtained was chromatographed repeatedly with silica gel columns. One pure natural product was obtained, which was identified as 5-isopropyl-2-methylphenol (carvacrol), separated for the first time from the

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