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piper/seenevastane
Link salvestatakse lõikelauale
Leht 1 alates 304 tulemused
Antifungal amides from Piper hispidum and Piper tuberculatum.
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Piper hispidum and Piper tuberculatum accumulate amides bearing isobutyl, pyrrolidine, dihydropyridone and piperidine moieties. The isolation and characterization of several representatives including two hitherto unreported amides were performed by chromatographic techniques and by analysis of
Antifungal amides from Piper arboreum and Piper tuberculatum.
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Logi sisse
In continuation of our study of the Piperaceae we have isolated several amides, mainly those bearing isobutyl, pyrrolidine, dihydropyridone and piperidine moieties. Bioactivity-guided fractionation of extracts from leaves of Piper arboreum yielded two new amides,
Antifungal amides from Piper scutifolium and Piper hoffmanseggianum.
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Chromatographic fractionation of a dichloromethane extract from the leaves of Piper scutifolium yielded two new isobutyl amides, scutifoliamide A ( 1) and scutifoliamide B ( 2), together with the known compounds piperolactam C ( 3), piperovatine ( 4), piperlonguminine ( 5), corcovadine ( 6),
Antifungal Amide Alkaloids from the Aerial Parts of Piper flaviflorum and Piper sarmentosum.
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Sixty-three amide alkaloids, including three new, piperflaviflorine A (1), piperflaviflorine B (2), and sarmentamide D (4), and two previously synthesized ones, (1E,3S)-1-cinnamoyl-3- hydroxypyrrolidine (3) and N-[7'-(4'-methoxyphenyl)ethyl]-2-methoxybenzamide (5), were isolated from the aerial
Antifungal Compounds from Piper Species.
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This review documents chemical structures and antifungal activities of 68 compounds isolated from 22 Piper species of the plant family Piperaceae. These compounds include amides, flavonoids, prenylated benzoic acid derivatives, lignans, phenylpropanoids, butenolides, and cyclopentendiones. Some of
Antifungal cyclopentenediones from Piper coruscans.
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Coruscanones A and B, two new antifungal cyclopentenedione derivatives, have been isolated from Piper coruscans and their structures elucidated by spectroscopic and chemical methods. Coruscanone A exhibits significant antifungal activity against Candida albicans and its azole-resistant strains and
Antifungal principles from Piper fulvescens.
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Activity-guided fractionation of the dichloromethane extract from leaves of Piper fulvescens, using an agar overlay bioautographic method, led to the isolation of three antifungal neolignans identified as conocarpan, eupomatenoid 5 and eupomatenoid 6. The minimal inhibitory concentration of these
Piper methysticum (kava kava).
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Piper methysticum (kava kava) is a plant native to the Pacific Island region, and has been used ceremonial for thousands of years. The active ingredients are a group of substances know as kava lactones (AKA kava pyrones). Four lactones in kava have been found to have significant analgesic and
Antifungal activity of Piper guineense of Cameroon.
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The antifungal activity of the ethanol extract of the seeds of Piper guineense and some of its fractions obtained by column chromatography was investigated using filamentous fungi and yeasts. The results indicated a significant antifungal effect. No toxic effect was observed in mice treated per os
Antifungal amide from leaves of Piper hispidum.
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Logi sisse
Bioactivity-guided fractionation of a CH2Cl2 extract from leaves of Piper hispidum (Piperaceae) yielded a new pyrrolidine amide, N-[7-(3',4'-methylenedioxyphenyl)-2(Z),4(Z)-heptadienoyl] pyrrolidine 1, in addition to two known amides N-[5-(3', 4'-methylenedioxyphenyl)-2(E)-pentadienoyl] pyrrolidine
Chemical constituents from Piper wallichii.
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Fifteen known compounds including four triterpenoids (1-4), one sterol (5), one diketopiperazine alkaloid (6) and nine phenolics (7-15) were isolated from the stems of Piper wallichii. Their structures were elucidated by means of spectroscopic analysis, and acidic hydrolysis in case of the
Bioactive aristolactams from Piper umbellatum.
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Logi sisse
Four alkaloids named piperumbellactams A-D (1-4) were isolated from branches of Piper umbellatum together with known N-hydroxyaristolam II (5), N-p-coumaroyl tyramine (6), 4-nerolidylcatechol (7), N-trans-feruloyltyramine, E-3-(3,4-dihydroxyphenyl)-N-2-[4-hydroxyphenylethyl]-2-propenamide,
Antifungal and antioxidant pyrrole derivative from Piper pedicellatum.
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Logi sisse
In continuation of our search for efficient pest control natural products from the flora of the South Eastern Sub-Himalayan biodiversity region, we have investigated wild edible Piper pedicellatum C. DC (Piperaceae) from Arunachal Pradesh, India against five important plant pathogenic fungi through
Antifungal activity of Piper diospyrifolium Kunth (Piperaceae) essential oil.
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In vitro activity of the essential oil from Piper diospyrifolium leaves was tested using disk diffusion techniques. The antifungal assay showed significant potencial antifungal activity: the oil was effective against several clinical fungal strains. The majority compounds in the essential oil were
Antifungal activity of benzoic acid derivatives from Piper lanceaefolium.
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Logi sisse
Bioactivity-guided fractionation of a methanol extract from the leaves of Piper lanceaefolium resulted in the isolation of four new benzoic acid derivatives (1-4), together with taboganic acid, pinocembrin, and pinocembrin chalcone. Lanceaefolic acid methyl ester (3) and pinocembrin chalcone
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