Constituintes químicos e avaliação do potencial alelopático de Adiantum tetraphyllum Humb. & Bonpl. Ex. Willd (Pteridaceae)

Abstract

Recebido em 17/10/05; aceito em 14/6/06; publicado na web em 28/11/06 CHEMICAL COMPOSITION AND EVALUATION OF ALLELOPATHIC POTENTIALS OF Adiantum tetraphyllum HUMB. & BONPL. EX. WILLD (PTERIDACEAE). Chemical studies of green leaves of A. tetraphyllum afforded β-sitosterol, a mixture containing the ethyl esters of long chain carboxylic acids, 30-normethyl-lupan-20-one, hopan-22-ol, phytol, phyten-3(20)-1,2-diol, quercetin and quercetin-3-O-β-D-glucoside. The structures of the compounds were elucidated by spectroscopic and GC analysis. The allelopathic potentials of the crude ethanolic extract and fractions were evaluated against Lactuca sativa (letuce) and Allium cepa (onion) seeds.

Flavonoides e atividade antioxidante em Palicourea rigida Kunth, Rubiaceae

“…Da fração acetato de etila, foram isolados os flavonóides 1, 2 e 3 os quais foram identificados pela análise dos espectros de RMN de 1 H e RMN de 13 C, incluindo as técnicas de DEPT, COSY, HMQC e HMBC e por comparação com os dados espectrais relatados na literatura: para quercetina 3-O-β-D-glicosídeo (1) (Melos et al, 2007); isoraminetina 3-glicosídeo (2) (Lee et al, 2005) e quercetina 3-O-soforosídeo (3) (Tang et al, 2007;Price et al, 1998). Não foi possível o isolamento de compostos da fração metanólica.…”

CHEMICAL CONSTITUENTS ISOLATED FROMTurnera subulataSm. AND ELECTROCHEMICAL CHARACTERIZATION OF PHAEOPHYTIN B

“…Compounds 2, 4, 5, and 7 are substituted with a phytyl ester at C-17 3 (Table 3) according to a comparison with the data reported by Melos et al 16 and by Tomaz. 12 These compounds were isolated for the first time from species of Turnera and Turneroideae, whereas compound 3 was first isolated from the genera Turnera.…”

Phytochemical Constituents and Pharmacological Activities of Plants from the Genus <i>Adiantum</i>: A Review

“…Eighty-five triterpenoids were isolated from the genus Adiantum [3][4][5] Figure 1) [3,[15][16][17][18][19][20][21][22][23][24][25][26]. Isohopane-type triterpenoid, 10, was isolated from A. lunulatum [27], and neohopane-type triterpenoids, 11-16 were also isolated from the genus Adiantum (Table 2, Figure 2).…”

“…Other pentacyclics include lupane and norlupane triterpenoids lup-20(29)-en-28-ol, 24-norlupan-3-one and adiantulupanone isolated from A. capillus-veneris, A. tetraphyllum and A. venustum [3,47,48]. Oleanane triterpenoids olean-12-en-3-one and olean-18-en-3-one were isolated from A. capillus-veneris [15,25].…”

“…Noroleanane triterpenoids adininaonol and adiantuoleanone were isolated from A. venustum and A. incisum respectively [21,48]. Ursane triterpenoid urs-20-en-16-ol was isolated from A. capillus-veneris [47], and gammacerane triterpenoids tetrahyma- [3]. Only one tetraterpenoid, α-carotene monoepoxide was isolated from A. venustum [5].…”