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18 results on '"dos Santos, Lourdes C."'

2. New Isoquinoline Alkaloids from Paraphaeosphaeria sporulosa F03, a Fungal Endophyte Isolated from Paepalanthus planifolius

Author

de Amorim, Marcelo R., additional, Paz, Tiago A., additional, Pinto, Luciano da S., additional, Hilário, Felipe, additional, Zanini, Camila L., additional, Aguiar, Anna Caroline C., additional, Silva, Débora E. S., additional, Furlan, Maysa, additional, Guido, Rafael V. C., additional, Bauab, Taís M., additional, Netto, Adelino V. de G., additional, and dos Santos, Lourdes C., additional

Published
2022
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12. Metabolic fingerprinting using direct flow injection electrospray ionization tandem mass spectrometry for the characterization of proanthocyanidins from the barks ofHancornia speciosa

Author

Rodrigues, Clenilson M., primary, Rinaldo, Daniel, additional, dos Santos, Lourdes C., additional, Montoro, Paola, additional, Piacente, Sonia, additional, Pizza, Cosimo, additional, Hiruma-Lima, Clélia A., additional, Brito, Alba R. M. Souza, additional, and Vilegas, Wagner, additional

Published
2007
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15. Determination of catechin diastereomers from the leaves of Byrsonimaspecies using chiral HPLC‐PAD‐CD

Author

Rinaldo, Daniel, Batista, João M., Rodrigues, Juliana, Benfatti, Ana C., Rodrigues, Clenilson M., Dos Santos, Lourdes C., Furlan, Maysa, and Vilegas, Wagner

Abstract

When catechins are found in plant extracts, they are almost always identified as catechin and/or epicatechin probably due to stereoselectivity of the enzymes involved in the biosynthesis of these substances. However, the lack of reports regarding to ent‐catechin as well as ent‐epicatechin does not necessarily mean that these compounds have not been produced. In fact, most of the previous reports used chromatographic conditions not suitable for such separation. This article describes a simple and reliable analytical HPLC‐PAD‐CD method for simultaneous determination of catechin diastereomers both in infusions and extracts from the leaves of Byrsonimaspecies. The direct separation of catechin, ent‐catechin, epicatechin, and ent‐epicatechin was obtained in normal phase by HPLC‐PAD‐CD using Chiralcel OD‐H as chiral stationary phase and n‐hexane/ethanol with 0.1% of TFA as mobile phase. Chirality, 2010. © 2010 Wiley‐Liss, Inc.

Published
2010
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16. Preparative Isolation of a Novel Flavonoid from an Infusion of Byrsonima basilobaLeaves by High-Speed Counter-Current Chromatography

Author

Sannomiya, Miriam, Figueiredo, Maria E., da Silva, Marcelo A., Rodrigues, Clenilson M., dos Santos, Lourdes C., Souza-Brito, Alba R. M., and Vilegas, Wagner

Abstract

A method for the isolation of three compounds from the infusion of leaves of Byrsonima basilobaA. Juss. by high-speed counter-current chromatography (HSCCC) was developed. This technique led to the separation of a novel compound, quercetin 3-O-α-L-rhamnopyranosyl-(1→3)-O-[α-L-rhamnopyranosyl-(1→6)]-β-D-allopyranoside, and two known compounds quercetin-3-O-α-L-rhamnopyranosyl-(1→6)-β-D-galactopyranoside and (+)-catechin in 4 h with purities of over 92%. The structures of the compounds were determined by one- and two-dimensional NMR spectroscopy and HPLC.

Published
2007
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18. High-performance liquid chromatographic separation and identification of polyphenolic compounds from the infusion of Davilla elliptica St. Hill.

Author

Rodrigues CM, Rinaldo D, Sannomiya M, dos Santos LC, Montoro P, Piacente S, Pizza C, and Vilegas W

Subjects
Flavonoids chemistry, Phenols chemistry, Plant Extracts chemistry, Plant Extracts isolation & purification, Plant Leaves chemistry, Polyphenols, Spectrometry, Mass, Electrospray Ionization, Tandem Mass Spectrometry, Chromatography, High Pressure Liquid methods, Dilleniaceae chemistry, Flavonoids isolation & purification, Phenols isolation & purification
Abstract

The isolation of polyphenolic compounds from an infusion of the Brazilian plant Davilla elliptica (Dilleniaceae), used as tea by virtue of its digestive properties, is described. An improved preparative HPLC method was used in order to isolate pure polyphenols from the complex mixture. Liquid-liquid extraction and solid-phase extraction were employed to minimise the interference of polymeric compounds and to provide an enriched fraction of the compounds of interest. The identification of the isolated compounds was performed using analytical HPLC as well as direct injection electrospray ionisation ion trap tandem mass spectrometry (ESI-IT-MS/MS). The high flavonoid content suggests that D. elliptica may be a promising source of compounds to produce natural phytomedicines., ((c) 2007 John Wiley & Sons, Ltd.)

Published
2008
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