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9 résultats
Recycling of phenolic compounds in Borneo's tropical peat swamp forests.
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BACKGROUND
Tropical peat swamp forests (TPSF) are globally significant carbon stores, sequestering carbon mainly as phenolic polymers and phenolic compounds (particularly as lignin and its derivatives) in peat layers, in plants, and in the acidic blackwaters. Previous studies show that TPSF plants
Phenolic derivatives with an irregular sesquiterpenyl side chain from Macaranga pruinosa.
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A stilbene and two flavonoid derivatives, macapruinosins A-C (1-3), together with two known flavonoids, papyriflavonol A and nymphaeol C, have been isolated from the acetone extract of the leaves of Macaranga pruinosa. The structures of these compounds were identified based on spectral data
Cytotoxic Phenolic Compounds from Fruit Glandular Trichomes of Macaranga tanarius.
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A new flavonoid, macatanarin D (1), together with five known stilbenes (2-6), was isolated from fruit glandular trichomes of Macaranga tanarius. Their structures were elucidated on the basis of spectroscopic methods and through comparison with data reported in the literature.
Cytotoxic phenolic compounds isolated from the fruits of Macaranga denticulata.
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A new modified geranylated flavonoid, 3'-dehydroxy-solophenol C (1), along with 17 known compounds (2-18) were isolated from the fruits of Macaranga denticulata. Their structures were established by spectral analysis, such as mass spectrometry, 1D-NMR and 2D-NMR. The new
Flavonoid and stilbene derivatives from Macaranga trichocarpa.
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A new farnesylated flavonol (4'-O-methylmacagigantin) and a new geranylated stilbene (macatrichocarpin H), together with eight known phenolic compounds, have been isolated from the leaves of Macaranga trichocarpa. Structures of these compounds were determined based on NMR and mass spectrroscopic
Inhibitory effect of macabarterin, a polyoxygenated ellagitannin from Macaranga barteri, on human neutrophil respiratory burst activity.
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An ellagitannin with a 2,4-acyl group, named macabarterin (1), and a new ellagic acid glycoside, 3-O-methylellagic acid 4-O-β-d-xylopyranoside (2), were isolated from the stem bark extract of Macaranga barteri along with five known phenolic compounds, ellagic acid (3), 3-O-methylellagic acid (4),
Geranylated flavonols from Macaranga rhizinoides.
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Two geranylated and methylated flavonol derivatives, macarhizinoidins A (1) and B (2), along with a known phenolic compound methyl 4-isoprenyloxycinnamate (3), have been isolated from the methanol extract of the leaves M. rhizinoides. The structures of these compounds were identified based on their
Chemical profiling, antioxidant, enzyme inhibitory and molecular modelling studies on the leaves and stem bark extracts of three African medicinal plants.
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Africa is famous for its floral biodiversity, exploited by local people for therapeutic purposes. However, such plants need to be scrutinised scientifically for the presence of bioactive compounds and possible biological properties. This study attempts for the first time to highlight the
Antioxidant, antityrosinase, anticholinesterase, and nitric oxide inhibition activities of three malaysian macaranga species.
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The methanol extracts of three Macaranga species (M. denticulata, M. pruinosa, and M. gigantea) were screened to evaluate their total phenolic contents and activities as cholinesterase inhibitors, nitric oxide (NO) production inhibitors, tyrosinase inhibitors, and antioxidants. The bark of M.
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