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Characterization of Catechins from Smilax domingensis Willd. in Cuba

100%
Soledispa P. A., González J., Cuéllar A., Pérez J., Monan M.
World News of Natural Sciences
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2019
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vol. 23
297-305
EN
Gas Chromatography coupled with mass spectrometry was applied to study the fragmentation of selected flavonoids from the ethanolic extract of Smilax domingensis Willd., Smilacaceae, known as zarzaparrilla, after Soxhlet extraction during 20 hours. Compounds belonging to one of the major subgroups found in common plants, i.e. flavanols were studied. Following solvent extraction and derivatization using BSTFA, possibly two different metabolites from the same chemical group were characterized in one analytical run: (+)-catechin and (-)-epicatechin. For the very first time, qualitative data on these analytes in the drug were determined after detailed validation of a sensitive, cheap and reliable GC-MS method.
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Chemical characterization by TLC, UV, IR, HPLC-MS/MS and NMR of gossypetin-3’-O-glucoside from Talipariti elatum (Sw.) Malvaceae

86%
González J., Cuéllar A., Gaysinski M., Massi L., Monan M., Nossin E., François-Haugrin F.
World News of Natural Sciences
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2019
|
vol. 24
100-116
EN
Talipariti elatum (Sw.) Malvaceae, also known as Blue Mahoe or Mountain Mahoe, commonly named as Majagua azul or Majagua, with red or crimson flowers, is a medicinal tree traditionally used against cough, asthma, catarrh, and expectorant. Its flowers contain a lot different chemical compounds, mainly flavonoids. From red petals of the flowers a flavonol glucoside was isolated and characterized by TLC, UV, IR, HPLC-MS/MS and NMR spectroscopy. Structure analyses of that chemical component revealed that It have the identical glucoside moiety attached to a flavonol skeleton like gossypitrin (gossypetin-7-O--glucoside) but in different position for which the structure of gossypetin-3’-O-glucoside was deduced from HSQC, HMBC, COSY and NOESY correlations.
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