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

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Author(s): Villaflores Oliver | Macabeo Allan Patrick | Gehle Dietmar | Krohn Karsten | Franzblau Scott | Aguinaldo Alicia

Journal: Pharmacognosy Magazine
ISSN 0973-1296

Volume: 6;
Issue: 24;
Start page: 339;
Date: 2010;
Original page

Keywords: Alpinia purpurata | fatty alcohols | kumatakenin | Mycobacterium tuberculosis | sitosteryl glycosides

ABSTRACT
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 chromatography to afford a mixture of C 28 -C 32 fatty alcohols, a 3-methoxyflavone and two steroidal glycosides. The two latter metabolites were spectroscopically identified as kumatakenin (1), sitosteryl-3-O-6-palmitoyl-b-D-glucoside (2) and b-sitosteryl galactoside (3) using ultraviolet (UV), infrared (IR), electron impact mass spectrometer (EIMS) and nuclear magnetic resonance (NMR) experiments, and by comparison with literature data. This study demonstrates for the first time the isolation of these constituents from A. purpurata. In addition to the purported anti-inflammatory activity, its phytomedicinal potential to treat tuberculosis is also described.
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