dihydrohelenalin/arnica

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Helenalin and 11 alpha,13-dihydrohelenalin, two constituents from Arnica montana L., inhibit human platelet function via thiol-dependent pathways.

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This study investigates the effect on human platelet function of two sesquiterpene lactones from Arnica montana L., helenalin (H) and 11 alpha,13-dihydrohelenalin (DH). Both compounds inhibited collagen-induced platelet aggregation, thromboxane formation and 5-hydroxytryptamine secretion in a

Sesquiterpene lactones in Arnica montana: helenalin and dihydrohelenalin chemotypes in Spain.

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An analytical RPLC method for sesquiterpene lactones in Arnica montana has been extended to include quantitative analyses of dihydrohelenalin esters. LC-ESI-MS-MS distinguished the isomeric helenalin and dihydrohelenalin esters. The dihydrohelenalin esters have lower response factors for UV

New triterpene esters from flowerheads of Arnica lonchophylla.

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From the flowerheads of Arnica lonchophylla Greene ssp. lonchophylla Maguire (Asteraceae), a variety of mono-, di- and trihydroxytriterpenes of the oleanane, ursane, lupane and dammarane types were isolated and their structures elucidated by EI and CI mass spectrometry and extensive NMR

[Sesquiterpenlactone aus Arnica chamissonis].

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From the flowers of Arnica chamissonis Less, sub-sp. foliosa (Nutt.) Maguire and its variety incana (Gray) Hulten two new naturally occuring pseudoguaianolides were isolated and their structures established by spectroscopic methods. They are shown to be 4-O-acetyl-6-desoxychamissonolide ( 3) and the

[Further Helenanolides from the Flowers of Arnica chamissonis subsp. foliosa].

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A phytochemical study of the flowers of ARNICA CHAMISSONIS Less. subsp. FOLIOSA (Nutt.) Maguire (Asteraceae) has resulted in the identification of a further 23 helenanolides. Six of them, 2alpha-hydroxy-6- O-angelicoyl-2,3-dihydrohelenalin ( 3B), 2alpha-hydroxy-6- O-senecioyl-2, 3-dihydrohelenalin (

On the stability of sesquiterpene lactones in the officinal Arnica tincture of the German pharmacopoeia.

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An investigation of sesquiterpene lactone content in Arnica tincture (German Pharmacopoeia) after storage for three years at different temperatures (+4, +25 and +30 degrees C) was carried out by GC and GC-MS analysis. A decrease (13, 32 and 37%, respectively) in the content of the main active

Helenalin Acetate in in vitro Propagated Plants of Arnica montana.

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Propagated "IN VITRO" shoots and plantlets of ARNICA MONTANA L. (Asteraceae) have been shown to produce sesquiterpene lactones, i.e. helenalin and 11,13-dihydrohelenalin esters. The compounds were detected in green organs only; roots of the plantlets contained no sesquiterpene lactones. The

Permeation of bioactive constituents from Arnica montana preparations through human skin in-vitro.

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This study investigated and characterised transdermal permeation of bioactive agents from a topically applied Arnica montana tincture. Permeation experiments conducted over 48 h used polydimethylsiloxane (silastic) and human epidermal membranes mounted in Franz-type diffusion cells with a

6-O-Isobutyryl-tetrahydrohelenalin from the flowers of Arnica montana.

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From the flowers of ARNICA MONTANA L., the helenanolides 6- O-isobutyryl-tetrahydrohelenalin and 2beta-ethoxy-6- O-isobutyryl-2,3-dihydrohelenalin were isolated and their structures established by spectroscopic methods.

Quantitative analysis of sesquiterpene lactones in extract of Arnica montana L. by 1H NMR spectroscopy.

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(1)H NMR spectroscopy was used as a method for quantitative analysis of sesquiterpene lactones present in a crude lactone fraction isolated from Arnica montana. Eight main components - tigloyl-, methacryloyl-, isobutyryl- and 2-methylbutyryl-esters of helenalin (H) and 11α,13-dihydrohelenalin (DH)

Skin penetration studies of Arnica preparations and of their sesquiterpene lactones.

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Alcoholic preparations of Arnica montana are widely used for the topical treatment of various inflammatory diseases. Sesquiterpene lactones (SLs) are mainly responsible for their anti-inflammatory activity. Here we have studied the penetration kinetics of Arnica tinctures prepared from dried Arnica

Skin penetration behaviour of sesquiterpene lactones from different Arnica preparations using a validated GC-MSD method.

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Preparations of Arnica montana L. are widely used for the topical treatment of inflammatory diseases. The anti-inflammatory activity is mainly attributed to their sesquiterpene lactones (SLs) from the helenalin and 11alpha,13-dihydrohelenalin type. To study the penetration kinetics of SLs in Arnica

Helenalin, an anti-inflammatory sesquiterpene lactone from Arnica, selectively inhibits transcription factor NF-kappaB.

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Alcoholic extracts prepared form Arnicae flos, the collective name for flowerheads from Arnica montana and A. chamissonis ssp. foliosa, are used therapeutically as anti-inflammatory remedies. The active ingredients mediating the pharmacological effect are mainly sesquiterpene lactones, such as

Sesquiterpene lactone content in leaves of in vitro and field cultivated Arnica montana.

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On the basis of GC and GC/MS analyses we report on the full qualitative and quantitative sesquiterpene lactone (STL) content of in vitro cultivated A. montana plantlets consisting of helenalin and 11alpha,13-dihydrohelenalin esters in approximately equal amounts. The accumulation of STL was shown to

Variation of sesquiterpene lactone contents in different Arnica montana populations: influence of ecological parameters.

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In ten grassland or heathland sites along a geographic (north to south) and climatic gradient in Germany, flowerheads of Arnica montana were collected, and the total content of sesquiterpene lactones (SLs) as well as the content of the detected single compounds were determined. The ratios of

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