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stellera/silicio dioksidas
Nuoroda įrašoma į mainų sritį
4 rezultatus
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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Prisijungti Registracija
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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Prisijungti Registracija
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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Prisijungti Registracija
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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