Neolignans, styrylpyrones and flavonoids from an Aniba species

Rossi, M H; Yoshida, Massayoshi; Maia, José Guilherme S.

doi:10.1016/s0031-9422(97)00075-7

Cited by 77 publications

(70 citation statements)

References 32 publications

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“…The positions of the methoxy groups were unequivocally determined by the HMBC spectrum. The carbon chemical shifts agreed well with those reported by Rossi et al (1997).…”

Section: Effects Of Leaf Surface Exudates On the Performance Of Firstsupporting

confidence: 89%

Defensive Effect of Surface Flavonoid Aglycones of Betula pubescens Leaves Against First Instar Epirrita autumnata Larvae

et al. 2004

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Abstract-The surface of birch leaves contains glandular trichomes that secrete exudates containing flavonoid aglycones. We investigated the biological activities of white birch (Betula pubescens) leaf surface exudates against larvae of the autumnal moth, Epirrita autumnata, a common insect pest of birch. We found that tree-specific mortality (up to 100%) of first instar larvae correlated strongly with the tree-specific contents of surface flavonoid aglycones (r s = 0.905) in emerging leaves. We also found that first instars clearly preferred birch buds from which surface exudates had been removed. In addition, the duration of the first instar was shortened by 29%, and the weights and relative growth rates of first instars improved by 8% and 52%, respectively, as a result of removal of the exudates from their leaf diet. The correlation of tree-specific foliar contents of flavonoid aglycones, especially 5-hydroxy-4 ,7-dimethoxyflavanone, with changes in larval performance, suggests that flavonoid aglycones are responsible for the changes observed in first instar larval performance. The results show that chemical characteristics of birch leaves are effective against neonate E. autumnata larvae. However, the removal of leaf surface exudates from fully expanded leaves did not affect the leaf acceptance for the voracious fifth instars. This is probably a result of reduction in contents of flavonoid aglycones compared to those of emerging leaves.

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“…The positions of the methoxy groups were unequivocally determined by the HMBC spectrum. The carbon chemical shifts agreed well with those reported by Rossi et al (1997).…”

Section: Effects Of Leaf Surface Exudates On the Performance Of Firstsupporting

confidence: 89%

Defensive Effect of Surface Flavonoid Aglycones of Betula pubescens Leaves Against First Instar Epirrita autumnata Larvae

et al. 2004

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“…Based on the spectral data and by comparison with those of the reported literature, the other isolated compounds were identifi ed as N-transferuloyltyramine (2) (Wu et al, 1995), β-sitosterol (3) (Rubinstein et al, 1976;Wright et al, 1978), clematine (4) (Chen et al, 1993), isoferulic acid methyl ester (5) (Bowden et al, 1975), ellagic acid (6) (Nawwar et al, 1982), its 3-methyl ether 7 (Bai et al, 2008), naringenin (8) (Shen et al, 1993), kaempferol-7,4'-dimethyl ether (rhamnocitrin-4'-methyl ether) (9) (Rossi et al, 1997), kaempferide (10) (Barberan et al, 1990), and dillenetin (11) (Simonsen et al, 2003).…”

Section: Resultsmentioning

confidence: 57%

3-O-trans-Caffeoylisomyricadiol: A New Triterpenoid from Tamarix nilotica Growing in Saudi Arabia

Orfali

Ebada

El-Shafae

et al. 2009

Zeitschrift Für Naturforschung C

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A detailed chemical study of the aerial parts of Tamarix nilotica (Tamaricaceae) from Saudi Arabia led to the isolation of a new pentacyclic triterpenoid, 3-O-trans-caffeoylisomyricadiol, in addition to nine known compounds. The structures of all isolated compounds were unambiguously elucidated by 1D, 2D NMR, and mass spectrometry. In the radical scavenging (DPPH) assay, 3-O-trans-caffeoylisomyricadiol exhibited potent antioxidant activity with an IC 50 value of 3.56 µM, while that for quercetin (standard antioxidant) was 5.72 µM.

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“…89, 3.87 and 3.85 showing the existence of three methoxyl groups. By comparing the data with previous literature (Rossi et al, 1997), the compound 2 was identified as 5-hydroxy-3, 7, 4'-trimethoxyflavone previously isolated from Aniba species. Compound 3 was obtained as white needles, m.p.…”

Section: Resultsmentioning

confidence: 62%

Anti-infective Activities of Secondary Metabolites from Vitex pinnata

Kamal¹,

Clements²,

Gray³

et al. 2016

J App Pharm Sci

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The phytochemical investigation of Vitex pinnata led to the isolation of a mixture of steroids -sitosterol and stigmasterol (1a and 1b) and three known flavonoid identified as 5-hydroxy-3, 7, 4'-trimethoxyflavone (2), 5-hydroxy-7,4'-dimethoxy-flavone (3) and 5-hydroxy-3,3',4',7-tetramethoxyflavone (4). The structures of all isolated compounds were carried out by NMR and mass spectrometry. The isolated compounds were evaluated for their anti-infective activities against Trypanosoma brucei brucei and Mycobacterium marinum. Compound 1-4 showed moderate antitrypanosomal activity with MIC values of 6.25 g/ml, 19.0, 21.0 and 17.0 M, respectively while no activity observed on anti-mycobacterial. This study is the first to report the presence of three flavones and their antitrypanosomal activity from V. pinnata.

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Neolignans, styrylpyrones and flavonoids from an Aniba species

Cited by 77 publications

References 32 publications

Defensive Effect of Surface Flavonoid Aglycones of Betula pubescens Leaves Against First Instar Epirrita autumnata Larvae

Defensive Effect of Surface Flavonoid Aglycones of Betula pubescens Leaves Against First Instar Epirrita autumnata Larvae

3-O-trans-Caffeoylisomyricadiol: A New Triterpenoid from Tamarix nilotica Growing in Saudi Arabia

Anti-infective Activities of Secondary Metabolites from Vitex pinnata

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