Resumo

PASTENE, E. R. et al. USO DE ESPECTROSCOPIA DE RMN Y MALDI-TOF MS EN LA ELUCIDACION ESTRUCTURAL DE FLAVONOIDES ANTIOXIDANTES PROVENIENTES DE LA PLANTA MEDICINAL CHILENA Cheilanthes glauca (Cav.) Mett. Bol. Soc. Chil. Quím. [online]. 2001, vol.46, n.4, pp.449-457. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442001000400009.

Cheilanthes glauca (Cav.) Mett., is a native Chilean species used in popular medicine for the topical treatment of wounds and contusions. A study on the total methanolic extract showed the presence of antioxidants in the ethyl acetate fraction. From this fraction, two known flavonol glycosides were isolated, quercetin-3-O-rhamnoglucoside and kaempferol-3,7-O-dirhamnoside. Both substances are described for the first time in this species. Structural elucidation was carried out by comparison with standard substances, chemical hydrolysis, UV spectra, ¹H- and ¹³C- NMR, COSY ¹H-¹H, DEPT and MALDI-TOF MS. Only quercetin-3-O-rhamnoglucoside (rutin) showed unspecific in vitro decolourizing activity upon DPPH radical

Palavras-chave : Cheilanthes glauca; ¹H-NMR; ¹³C-NMR; MALDI-TOF MS; Flavonoids; Rutin; Kaempferol; Antioxidants.