illicium burmanicum/oxid kremičitý

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[Chemical constituents of Illicium burmanicum].

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Chemical constituents of ethyl acetate extract of Illicium burmanicum were isolated and purified by various chromatographic methods,including Silica gel, Sephadex LH-20, C18 reverse-phased silica gel, Preparative TLC and Preparative HPLC. Their structures were identified by spectral analysis

[Two new sesquiterpene lactones from the pericarp of Illicium macranthum].

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Silica gel column chromatography was used for the isolation and purification of the chemical constituents of the pericarp of Illicium macranthum. From dichloromethane-EtOAc (1:1) fraction and EtOAc fraction of the methanol extracts, eleven compounds were identified on the basis of chemical and

[Studies on chemical constituents of Illicium simonsii].

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OBJECTIVE To study the chemical constituents of the Illicium simonsii. METHODS The stems and leaves of I. simonsii were extracted with 95% EtOH. The EtOH extract was dispersed in H2O and extracted with petroleum, CHCl3 and BuOH, successively. The CHCl3 and BuOH fractions were isolated and purified

A new sesquiterpene lactone from the fruits of Illicium henryi.

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OBJECTIVE To study the chemical constituents of the fruits of Illicium henryi. METHODS Chromatographic separations on silica gel, Sephadex LH-20 gel and MCI gel were used to isolate the compounds. The structures were elucidated based on extensive spectroscopic data analyses. RESULTS Seven compounds

[Chemical constituents from roots of Illicium majus].

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Ten compounds, including seven sesquiterpenes, two phenols and one phenylpropanoid, were isolated from the roots of Illicium majus by means of silica gel, ODS, Sephadex LH-20, and preparative HPLC. On analysis of MS and NMR spectroscopic data , their structures were established as

[Chemical constituents from rhizomes of Illicium henryi].

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OBJECTIVE To study the chemical constituents of Illicium henryi. METHODS Column chromatographic techniques using silica gel, Sephadex LH-20, Rp-8 and Rp-18 as packing materials were applied to isolate constituents. The structures of isolates were determined on the basis of spectroscopic data

[Investigation on seco-prezizaane sesquiterpenes from fruits of Illicium lanceolatum and their neuroprotection activity].

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Ten seco-prezizaane sesquiterpenes were isolated from the water-soluble fraction of the fruit of Illicium lanceolatum using the combined methods of silica gel column chromatography,Sephadex LH-20 column chromatography,and RP-preparative HPLC. They were elucidated as majusanol E(

A new phenylpropanoid glycoside from the fruits of Illicium simonsii.

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OBJECTIVE To study the constituents and bioactivity of Illicium simonsii. METHODS The extracts of the fruits of Illicium simonsii were submitted to a combination of chromatographic materials, silica gel, ODS column chromatography and finally preparative HPLC to obtain eight compounds which were

[Analysis of volatile oil in Illicium verum fruit by on-line coupled packed capillary liquid chromatography/capillary gas chromatography].

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Volatile oil in Illicillm Verum Fruit was analyzed by on-line coupled packed capillary high performance liquid chromatography/capillary gas chromatography (micro-HPLC-CGC). A micro-HPLC column of 250 mm x 0.32 mm i.d. packed with 5 microm cyano-bonded silica stationary phase was used for group

Toxicity of the essential oil of Illicium difengpi stem bark and its constituent compounds towards two grain storage insects.

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During our screening program for new agrochemicals from Chinese medicinal herbs, the essential oil of Illicium difengpi stem bark was found to possess strong insecticidal activities against the maize weevil, Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) and red flour beetle, Tribolium

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