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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Targeted Isolation of Indolopyridoquinazoline Alkaloids from Conchocarpus fontanesianus Based on Molecular Networks

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Author(s):
Cabral, Rodrigo Sant'Ana ; Allard, Pierre-Marie ; Marcourt, Laurence ; Marx Young, Maria Claudia ; Queiroz, Emerson Ferreira ; Wolfender, Jean-Luc
Total Authors: 6
Document type: Journal article
Source: Journal of Natural Products; v. 79, n. 9, p. 2270-2278, SEP 2016.
Web of Science Citations: 10
Abstract

A dichloromethane-soluble fraction of the stem bark of Conchocarpus fontanesianus showed antifungal activity against Candida albicans in a bioautography assay. Off-line high-pressure liquid chromatography activity-based profiling of this extract enabled a precise localization of the compounds responsible for the antifungal activity that were isolated and identified as the known compounds flindersine (17) and 8-methoxyflindersine (18). As well as the identification of the bioactive principles, the ultra-high-pressure liquid chromatography high-resolution mass spectrometry metabolite profiling of the dichloromethane stem bark fraction allowed the detection of more than 1000 components. Some of these could be assigned putatively to secondary metabolites previously isolated from the family Rutaceae. Generation of a molecular network based on MS2 spectra indicated the presence of indolopyridoquinazoline alkaloids and related scaffolds. Efficient targeted isolation of these compounds was performed by geometric transfer of the analytical high-pressure liquid chromatography profiling conditions to preparative medium-pressure liquid chromatography. This yielded six new indolopyridoquinazoline alkaloids (5, 16, 19-22) that were assigned structurally. The medium-pressure liquid chromatography separations afforded additionally 16 other compounds. This work has demonstrated the usefulness of molecular networks to target the isolation of new natural products and the value of this approach for dereplication. A detailed analysis of the constituents of the stem bark of C. fontanesianus was conducted. (AU)

FAPESP's process: 13/05480-0 - Chemical characterization and comparision of secondary metabolic profile of Conchocarpus fontanesianus (Rutaceae) in two regions of Atlantic Rainforest in São Paulo State
Grantee:Rodrigo Sant'Ana Cabral
Support Opportunities: Scholarships abroad - Research Internship - Doctorate