Navegando por Palavras-chave "Oxandra sessiliflora"

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    A new flavonoid derivative from leaves of Oxandra Sessiliflora R. E. Fries
    (Sociedade Brasileira de Química, 2014-04-01) Sousa, Elcilene Alves de; Silva, Armenio Andre de Carvalho Almeida da; Cavalheiro, Alberto José; Lago, Joao Henrique Ghilardi [UNIFESP]; Chaves, Mariana Helena; Universidade Federal do Piauí Departamento de Química; Universidade Estadual Paulista (UNESP); Universidade Federal de São Paulo (UNIFESP)
    The ethyl acetate (EtOAc) phase obtained from the partition of the ethanol (EtOH) extract from leaves of O. sessiliflora R. E. Fries (Annonaceae) was subjected to several chromatographic steps, including high efficiency liquid chromatography (HPLC), to afford the flavonoids: quercetin-3-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranoside (1), unprecedented in the literature, kaempferol-3-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranoside (2), rutin (3), and kaempferol-3-O-rutinoside (4). The structures were elucidated by analysis of their ¹H and 13C nuclear magnetic resonance (NMR) (1D and 2D) spectra and mass spectrometry.
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    Terpenes and steroids from leaves of Oxandra sessiliflora R. E. Fries
    (Elsevier B.V., 2014-05-01) Sousa, Elcilene A. de; Silva, Armenio A. de Carvalho A. da; Roque, Nidia F.; Vieira Junior, Gerardo M.; Lago, Joao Henrique G. [UNIFESP]; Chaves, Mariana H.; Univ Fed Piaui; Universidade Federal da Bahia (UFBA); Univ Fed Mato Grosso; Universidade Federal de São Paulo (UNIFESP)
    The EtOH extract from the leaves of Oxandra sessiliflora R. E. Fries (Annonaceae) was partitioned using hexane and CH2Cl2. After several chromatographic steps, caryophyllene oxide and spathulenol were isolated from hexane phase while, from CH2Cl2 phase, we isolated (E)-phytol, spathulenol, 4 beta,10 alpha-dihydroxyaromadendrane, 1 beta,6 alpha-dihydroxyeudesm-4(15)-ene, and 4 alpha, 7 beta, 10 alpha-trihydroxyguai-5-ene, the latter being a new sesquiterpene derivative. Additionally, a mixture of steroids (campesterol, sitosterol, and stigmasterol) was obtained from the CH2Cl2 phase. the isolated compounds were characterized by mass spectrometry and analysis of their H-1 and C-13 NMR spectroscopic data, including bidimensional analysis. (C) 2013 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.