SciELO - Scientific Electronic Library Online

vol.46 issue3Crystal and Molecular Structure of 2-Aminoacetophenone-N(3)-dimethylthiosemicarbazonePatrón proteico extracelular durante la embriogénesis somática en suspensiones celulares de Coffea arabica L. author indexsubject indexsearch form
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • Have no similar articlesSimilars in SciELO


Revista de la Sociedad Química de México

Print version ISSN 0583-7693


VAZQUEZ, Erika; MARTINEZ, Esteban M.; COGORDAN, Juan Antonio  and  DELGADO, Guillermo. Triterpenes, Phenols, and Other Constituents from the leaves of Ochroma pyramidale (Balsa Wood, Bombacaceae): Preferred Conformations of 8-C-β-D-Glucopyranosyl-apigenin (vitexin). Rev. Soc. Quím. Méx [online]. 2002, vol.46, n.3, pp.254-258. ISSN 0583-7693.

Lupeol, oleanolic acid, stigmasterol, β-sitosterol, β-sitosteryl-β-D-glucopyranoside, catechin, epicatechin, and 8-C-β-D-glucopyranosylapigenin (vitexin) were isolated from the acetonic extract of the leaves of Ochroma pyramidale (balsa wood, Bombacaceae), a tree noted by its exceedingly light wood. 1H and 13C NMR of 8-C-β-D-glucopyranosyl-apigenin (vitexin) at room temperature exhibited doubling of some signals, suggesting the presence of atropisomers. 1H NMR spectra at 70 °C showed one set of signals, confirming the presence of rotational isomers at room temperature. Molecular modelling using AM1 methods, established the two conformations of minimum energy for vitexin, which correspond to the -ac (ω = -94 °) and +ac (ω = + 96 °) arrangement along the C(2")-C(1")-C(8)-C(7) bonds.

Keywords : Ochroma pyramidale; balsa wood; Bombacaceae; triterpenes; phenols; sterols; conformational analysis; mollecular modeling; vitexin.

        · abstract in Spanish     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License