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avicularin/hypericum
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Antioxidant activity of a flavonoid-rich extract of Hypericum perforatum L. in vitro.
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A flavonoid-rich extract of Hypericum perforatum L. (FEHP) was prepared by adsorption on macroporous resin and desorption by ethanol. Total flavonoid content of FEHP was determined by a colorimetric method. The major constituents of FEHP, including rutin, hyperoside, isoquercitrin, avicularin,
Determination of flavonoids in Hypericum perforatum by HPLC analysis.
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OBJECTIVE
To establish an HPLC method for simultaneous determination of four flavonoids in Hypericum perforatum L., ruitn, hyperin, avicularin and quercetin.
METHODS
C18 column was used, the chromatography was carried out with a linear gradient program. The mobile phase was A: H2O (pH 3.0-3.5
Separation of epigallocatechin and flavonoids from Hypericum perforatum L. by high-speed counter-current chromatography and preparative high-performance liquid chromatography.
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High-speed counter-current chromatography (HSCCC) and preparative high-performance liquid chromatography (prep-HPLC) were successively used for the separation of epigallocatechin and flavonoids from Hypericum perforatum L. The two-phase solvent system composed of ethyl acetate-methanol-water
Phenolic metabolites from Hypericum kelleri Bald., an endemic species of Crete (Greece).
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Thirteen compounds were isolated from the aerial parts of Hypericum kelleri Bald., growing as an endemic on the island of Crete (Greece). These compounds comprise four previously unknown prenylated xanthones 1,2-dihydro-3,8-dihydroxy-6-methoxy-1,1,5-tri(3-methylbut-2-enyl)xanthen-2,9-dione
Population Variability of Main Secondary Metabolites in Hypericum lydium Boiss. (Hypericaceae).
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In the present study, we investigated the variation in the content of naphthodianthrones hypericin and pseudohypericin, phloroglucinol derivatives hyperforin and adhyperforin, the phenolic acids as chlorogenic acid, neochlorogenic acid, 2,4-dihydroxybenzoic acid, and the flavonols, namely,
Secondary metabolites of seven Hypericum species growing in Turkey.
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Context The genus Hypericum (Hypericaceae) has attracted remarkable scientific interest as its members have yielded many bioactive compounds. Objective The current study presents investigations on the accumulation of hypericin, pseudohypericin, hyperforin, adhyperforin, chlorogenic acid,
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