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pimpinellin/barštis
Nuoroda įrašoma į mainų sritį
8 rezultatus
Phototoxicity from furocoumarins (psoralens) of Heracleum laciniatum in a patient with vitiligo. Action spectrum studies on bergapten, pimpinellin, angelicin and sphondin.
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Investigations on light reactions in a patient with vitiligo are presented. The minimal erythema dose (MED) in the UVB area was approximately 1/3 of that in persons of skin type II. The application of furocoumarins (psoralens) increased light tolerance by 1 MED at 300-310 nm. Action spectrum studies
Isolation And Structure Elucidation Of 5,7-disubstituted Simple Coumarins In The Fruits Of Heracleum Mantegazzianum.
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In addition to bergapten ( 1 ), xanthotoxin ( 2 ), isopimpinellin ( 3 ), imperatorin ( 4 ), and pimpinellin ( 5 ), for the first time 5,7-disubstituted simple coumarins, limettin (5,7-dimethoxycoumarin) ( 6 ) and a new compound 5-methoxy-7-(3,3-dimethylalliloxy)-coumarin ( 7 ), have been isolated
The furanocoumarins in the roots of Heracleum sibiricum L.
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From roots of Heracleum sibiricum L (cow parsnip) collected natural state, a raw crystalline furanocoumarin precipitate was obtained containing four compounds: bergapten, isopimpinellin, pimpinellin, sphondin. The isolated compounds were identified with H1NMR.
Furanocoumarin Content, Antioxidant Activity, and Inhibitory Potential of Heracleum verticillatum, Heracleum sibiricum, Heracleum angustisectum, and Heracleum ternatum Extracts against Enzymes Involved in Alzheimer's Disease and Type II Diabetes.
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Hexane extracts of Heracleum verticillatum, H. sibiricum, H. angustisectum, and H. ternatum were studied for their furanocoumarin content antioxidant potential and acetylcholinesterase and α-amylase inhibitory activities. Quantification of the furanocoumarins was performed by 1 H-NMR.
Bioactivity-guided isolation of antimicrobial coumarins from Heracleum mantegazzianum Sommier & Levier (Apiaceae) fruits by high-performance counter-current chromatography.
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An efficient strategy, based on bioassay-guided fractionation, high-performance liquid chromatography (HPLC), and high-performance counter-current chromatography (HPCCC), was established to purify and evaluate the bioactive compounds from the dichloromethane extract of the fruits of Heracleum
The Canadian medicinal plant Heracleum maximum contains antimycobacterial diynes and furanocoumarins.
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BACKGROUND
Heracleum maximum is amongst the most commonly used plants by the indigenous peoples of North America. The First Nations of the eastern Canada use infusions of Heracleum maximum roots for the treatment of respiratory ailments including tuberculosis. Previous investigations of extracts
Furocoumarins of Heracleum laciniatum: isolation, phototoxicity, absorption and action spectra studies.
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Isolation of the furocoumarins (psoralens) bergapten, isobergapten, sphondin, isopimpinellin and pimpinellin from the Umbilliferous plant Heracleum laciniatum was carried out by column chromatography, and the structure and absorption spectra for the 5 furocoumarins isolated are described.
Accidental induction of photocontact allergy to Heracleum laciniatum.
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Photocontact allergy to psoralens in Heracleum laciniatum occurred in two persons volunteering for investigations into phototoxicity of plant homogenates and purified psoralens. Photoallergy was noted following the fifth exposure in case 1, and the sixth in case 2. Testing with diluted solutions
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