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Liquid chromatography-tandem mass spectrometry of I3,II8-biapigenin, the major biflavone in Hypericum perforatum extracts.

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High-performance liquid chromatography method coupled with tandem mass spectrometry was developed for the quantitative determination of I3,II8-biapigenin. The procedure includes solid-phase extraction and separation on an XTerra MS C18. The assay was linear over a wide range; precision and accuracy

Quercetin, kaempferol and biapigenin from Hypericum perforatum are neuroprotective against excitotoxic insults.

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In the present study we investigated the effects of phenolic compounds present in Hypericum perforatum against neuronal excitotoxicity and mitochondrial dysfunction. Quercetin, kaempferol and biapigenin significantly reduced neuronal death caused by 100 microM kainate plus 100 microM

In vitro binding studies with two hypericum perforatum extracts--hyperforin, hypericin and biapigenin--on 5-HT6, 5-HT7, GABA(A)/benzodiazepine, sigma, NPY-Y1/Y2 receptors and dopamine transporters.

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Interactions between neurotransmitter receptors involved in the pathophysiology of depression, anxiety and ethanol consumption and two extracts (hydromethanolic and lipophilic extracts obtained with hypercritical CO2) from Hypericum Perforatum L or St. John's wort (SJW) and three constituents

Development of an LC-MS method for simultaneous quantitation of amentoflavone and biapigenin, the minor and major biflavones from Hypericum perforatum L., in human plasma and its application to real blood.

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BACKGROUND Biflavones of Hypericum perforatum L. are bioactive compounds used in the treatment of inflammation and depression. Determination of amentoflavone and biapigenin from blood is challenging owing to their similar structures and low concentrations. OBJECTIVE To develop a rapid, sensitive and

Quantitative changes of dianthrones, hyperforin and flavonoids content in the flower ontogenesis of Hypericum perforatum.

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Samples of Hyperici herba were obtained by harvesting Hypericum perforatum L. in different plant development stages. The relation of flower development phases in the drug's flower fraction was examined. The HPLC method was then employed for the analysis of the content of secondary metabolites in

Identification of the major constituents of Hypericum perforatum by LC/SPE/NMR and/or LC/MS.

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The newly established hyphenated instrumentation of LC/DAD/SPE/NMR and LC/UV/(ESI)MS techniques have been applied for separation and structure verification of the major known constituents present in Greek Hypericum perforatum extracts. The chromatographic separation was performed on a C18 column.

Significance of genetic and environmental aspects in the field cultivation of Hypericum perforatum.

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Agronomical and biochemical parameters of seven Hypericum perforatum (St. John's wort) accessions grown at three experimental sites in Switzerland were followed over a two year period (1995-1996). Significant effects of environmental (= site) and genetic factors (= accession) on flowering dates,

TLC-Direct Bioautography as a Bioassay Guided Method for Investigation of Antibacterial Compounds in Hypericum perforatum L.

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Fast high-throughput TLC-direct bioautography (DB) is an effect-directed analysis method that enables searching for biologically active (e.g., antimicrobial) substances in complex mixtures like plant extracts. The principle of the method is that separation and detection of biological properties of

Biflavonoids in Hypericum perforatum1; Part 1. Isolation of I3, II8-Biapigenin.

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From the Soxhlet extract of HYPERICUM PERFORATUM, biflavonoids have been isolated by column chromatography on Sephadex LH 20 and preparative TLC. The structure of the main compound was elucidated by UV-, (1)H- and (13)C-NMR spectroscopy and MS as I3,II8-Biapigenin.

Evaluation of Hypericum perforatum oil extracts for an antiinflammatory and gastroprotective activity in rats.

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Oil extracts of Hypericum perforatum L. (Oleum Hyperici) were prepared in three different ways according to the prescriptions from traditional medicine. Variability of constituents and biological activity were evaluated in the obtained oil extracts. The carrageenan-induced rat paw edema test has

Comprehensive phytochemical characterization of St. John's wort (Hypericum perforatum L.) oil macerates obtained by different extraction protocols via analytical tools applicable in routine control.

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The aim of the present study was to investigate the impact of crucial process parameters, i.e. of light and temperature conditions, during the preparation of St. John's wort (SJW, Hypericum perforatum L.) Arachis oil macerates. Extracts were prepared according to a standardized protocol over a

Biapigenin modulates the activity of the adenine nucleotide translocator in isolated rat brain mitochondria.

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In this study, we investigated the effects of biapigenin, a biflavone present in the extracts of Hypericum perforatum, in rat brain mitochondrial bioenergetics and calcium homeostasis. We found that biapigenin significantly decreased adenosine diphosphate (ADP)-induced membrane depolarization and

Extracts and constituents of Hypericum perforatum inhibit the binding of various ligands to recombinant receptors expressed with the Semliki Forest virus system.

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Extracts, fractions and constituents of Hypericum perforatum were studied for in vitro receptor binding with various ligands to recombinant CNS receptors expressed with the Semliki Forest virus expression system. For this purpose we have prepared membranes of CHO cells with high density of several

Development, characterization, antioxidant and hepatoprotective properties of poly(Ɛ-caprolactone) nanoparticles loaded with a neuroprotective fraction of Hypericum perforatum.

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Quercetin and biapigenin are antioxidant and neuroprotective compounds present in Hypericum perforatum, with potential application in neurodegenerative diseases. Quercetin has shown to have excellent antioxidant activities. Biapigenin possesses a distinctive mechanism of action, preventing the onset

Neurochemical studies with St. John's wort in vitro.

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The effect of extracts and constituents of St. John's wort, Hypericum perforatum, at various CNS receptors were studied by radioligand binding techniques in order to determine a profile of pharmacological activity in vitro. Binding inhibition was examined for the G-protein coupled opioid, serotonin

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