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Alcaloides iboga de Peschiera affinis (Apocynaceae) - Atribuição inequívoca dos deslocamentos químicos dos átomos de hidrogênio e carbono: atividade antioxidante Iboga alkaloids from Peschiera affinis (Apocynaceae) - unequivocal 1H and 13C chemical shift assignments: antioxidant activity

By Allana Kellen L. Santos, Ticiane S. Magalhães, Francisco Jose Q. Monte, Marcos Carlos de Mattos, Maria Conceição F. de Oliveira, Maria Mozarina B. Almeida, Telma L. G. Lemos and Raimundo Braz-Filho


<abstract language="eng">Six known alkaloids iboga type and the triterpen &#945;- and &#946;-amyrin acetate were isolated from the roots and stems of Peschiera affinis. Their structures were characterized on the basis of spectral data mainly NMR and mass spectra. 1D and 2D NMR spectra were also used to unequivocal ¹H and 13C chemical shift assignments of alkaloids. The ethanolic extract of roots, alkaloidic and no-alkaloidic fractions and iso-voacristine hydroxyindolenine and voacangine were evaluated for their antioxidative properties using an autographic assay based on &#946;-carotene bleaching on TLC plates, and also spectrophotometric detection by reduction of the stable DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical

Topics: Peschiera affinis, iboga alkaloids, DPPH, Chemistry, QD1-999, Science, Q, DOAJ:Chemistry (General), DOAJ:Chemistry
Publisher: Sociedade Brasileira de Química
Year: 2009
DOI identifier: 10.1590/S0100-40422009000700028
OAI identifier:
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