kumatakenin/alpinia

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[Flavonoids from rhizome of Alpinia tonkinensis].

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OBJECTIVE To find out the bioactive principles of Alpinia tonkinensis, by investigating its chemical constituents. METHODS It was extracted with MeOH, distributed by different solvents, and isolated via column chromatography on silica gel. RESULTS Six compounds were elucidated through spectral

[Flavonoids from the seeds of Alpinia galanga Willd].

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Ten flavonoids were isolated from the 95% ethanol extract of the seeds of Alpinia galanga Willd. with a combination of various chromatographic techniques, including silica gel, Sephadex LH-20 and preparative HPLC. On the basis of spectroscopic data analysis, they were elucidated as (2R,

Phytoconstituents from Alpinia purpurata and their in vitro inhibitory activity against Mycobacterium tuberculosis.

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Alpinia purpurata or red ginger was studied for its phytochemical constituents as part of our growing interest on Philippine Zingiberaceae plants that may exhibit antimycobacterial activity. The hexane and dichloromethane subextracts of the leaves were fractionated and purified using silica gel

A new flavonone from seeds of Alpinia katsumadai and its neuroprotective effect on PC12 cells.

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A new flavonone, named as (2R, 3S)-pinobanksin-3-cinnamate(1), together with six known compounds, pinocem-brin (2), pinobanksin (3), 3-O-acetylpinobanksin (4), galangin (5), kumatakenin(6), and 3-methylkaempferol (7), were isolated from a 95% ethanol extract of seeds of Alpinia katsumadai through a

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