Activity-guided isolation of the chemical constituents of Muntingia calabura using a quinone reductase induction assay.

Abstract

Activity-guided fractionation of an EtOAc-soluble extract of the leaves of Muntingia calabura collected in Peru, using an in vitro quinone reductase induction assay with cultured Hepa 1c1c7 (mouse hepatoma) cells, resulted in the isolation of a flavanone with an unsubstituted B-ring, (2R,3R)-7-methoxy-3,5,8-trihydroxyflavanone (5), as well as 24 known compounds, which were mainly flavanones and flavones. The structure including absolute stereochemistry of compound 5 was determined by spectroscopic (HRMS, 1D and 2D NMR, and CD spectra) methods. Of the isolates obtained, in addition to 5, (2S)-5-hydroxy-7-methoxyflavanone, 2',4'-dihydroxychalcone, 4,2',4'-trihydroxychalcone, 7-hydroxyisoflavone and 7,3',4'-trimethoxyisoflavone were found to induce quinone reductase activity.

• Authors: Bao-Ning Su, Eun Jung Park, Jose Schunke Vigo, James G Graham, Fernando Cabieses, Harry H S Fong, John M Pezzuto, A Douglas Kinghorn
• Journal: Phytochemistry (Phytochemistry) Vol. 63 Issue 3 Pg. 335-41 (Jun 2003) ISSN: 0031-9422 [Print] England
• PMID: 12737982 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Antineoplastic Agents, Phytogenic
• Flavonoids
• NAD(P)H Dehydrogenase (Quinone)

Topics

• Animals
• Antineoplastic Agents, Phytogenic (chemistry)
• Drug Screening Assays, Antitumor
• Enzyme Induction (drug effects)
• Flavonoids (chemistry, isolation & purification, pharmacology)
• Liver Neoplasms, Experimental
• Mice
• NAD(P)H Dehydrogenase (Quinone) (biosynthesis, metabolism)
• Nuclear Magnetic Resonance, Biomolecular
• Plant Leaves (chemistry)
• Plants, Medicinal (chemistry)
• Tumor Cells, Cultured