Results 181 to 190 of about 2,920 (220)

Biflavonoids from Daphne linearifolia Hart.

Phytochemistry Letters, 2012
Abstract Two new biflavonoids, 2″-hydroxygenkwanol A ( 1 ) and 4′-methylgenkwanol A ( 2 ), together with fourteen known compounds were isolated from the aerial parts of Daphne linearifolia Hart. Their chemical structures were elucidated by extensive NMR spectral studies, as well as by ESI-MS analysis.
MALAFRONTE, NICOLA, Vassallo Antonio, DAL PIAZ, FABRIZIO, Bader Ammar, Braca Alessandra, DE TOMMASI, Nunziatina   +5 more
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Diastereoisomeric biflavonoids and a cleaved biflavonoid from Ochna rhizomatosa

Planta Medica
Biflavonoids are structurally diverse secondary metabolites with biological activity of high relevance, such as anticancer, antibacterial, antioxidant and anti-inflammatory, among others [1] [2]. In this study, we report the isolation of two diastereoisomeric biflavonoids (Fig.
Tchoukoua, Abdou, Frese, Marcel, Sewald, Norbert   +2 more
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Tetraflavonoid and biflavonoids from Aristolochia ridicula

Phytochemistry, 2008
Biflavones, a chalcone-flavone, and a tetraflavonoid with a new carbon skeleton were isolated from the leaves of Aristolochia ridicula. Their structures were determined by chemical derivatizations and spectrometric analyses.
Machado, Marcos B., Lopes, Lucia Maria Xavier   +1 more
openaire   +3 more sources

Neuroprotective effects of naturally occurring biflavonoids

Bioorganic & Medicinal Chemistry Letters, 2005
We examined neuroprotective effects of naturally occurring biflavonoids on oxidative stress-induced and amyloid beta peptide-induced cell death in neuronal cells. Among the nine biflavonoids tested, amentoflavone, ginkgetin, and isoginkgetin exhibited strong neuroprotection against cytotoxic insults induced by oxidative stress and amyloid beta ...
Sam Sik, Kang, Ji Yeon, Lee, Yoo Keum, Choi, Sun Sook, Song, Ju Sun, Kim, Su Jin, Jeon, Yong Nam, Han, Kun Ho, Son, Byung Hee, Han   +8 more
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A new biflavonoid fromOchna Beddomei

Journal of Asian Natural Products Research, 2003
A new biflavonoid, 2,3-dihydroochnaflavone 7,4',7"-tri-O-methyl ether (1) together with two known biflavonoids namely, 2,3-dihydroochnaflavone (2) and ochnaflavone (3) were isolated from the stem bark of Ochna beddomei. The structures were determined by means of spectral and chemical studies.
Jayakrishna, G., Reddy, M.K., Jayaprakasam, B., Gunasekar, D., Blond, A., Bodo, B.   +5 more
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Biflavonoids from Daphne odora

Phytochemistry, 1995
Abstract Two new biflavonoids, daphnodorins E and F, were isolated from the roots of Daphne odora and their structures established from spectral and chemical evidence.
Kimiye Baba, Michi Yoshikawa, Masahiko Taniguchi, Mitsugi Kozawa   +3 more
openaire   +1 more source

Crystal structure of 2,4′-biflavonoid

Journal of Chemical Crystallography, 1997
The X-ray crystal structure of 2,4′-biflavonoid has been determined. Colorless regular prism shaped crystals of C30H22O4 crystallize in the space group $$P\bar 1$$ with cell dimensionsa=11.574(1) A,b=12.235(1) A,c=17.428(1) A, α=108.46(3)o, β=80.08(1)o, γ=103 ...
Chuan-Feng Chen, Jian-Hua Xu, Ying Zhu, You-Cheng Liu   +3 more
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Biflavonoid constituents of Campylospermum mannii

Biochemical Systematics and Ecology, 2009
Abstract Air dried leaves and stem bark of Campylospermum mannii used in the south of Cameroon by the Baka pigmies to remedy heart and stomach disorders have been examined for their photochemical content. Three biflavonoid, amentoflavone, robustaflavone and chamaejasmin were characterized alongside with two new biflavonoids, campylospermones A and ...
S.S. Elo Manga, A.E. Tih, R.T. Ghogomu, A. Blond, B. Bodo   +4 more
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Biflavonoids and Proanthocyanidins

1989
The biflavonoids and proanthocyanidins constitute the two major classes of oligomeric flavonoids found in plants (126, 136). The biflavonoids are oxidative coupling products leading to biflavones, flavanone-flavones, and biflavanones. These compounds always carry carbonyl functions at the C-4 positions (126).
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Biflavonoids from Ochna lanceolata

Phytochemistry Letters, 2008
Abstract Two new biflavonoids, 7,4′,7″,4‴-tetramethylisochamaejasmin ( 1 ) and 2,3-dihydroochnaflavone 7″- O - methyl ether ( 2 ), together with six known flavonoids ( 3 – 8 ) were isolated from the stem bark of Ochna lanceolata . Their structures were established on the basis of spectral studies.
Bandi A.K. Reddy, Nimmanapalli P. Reddy, Duvvuru Gunasekar, Alain Blond, Bernard Bodo   +4 more
openaire   +1 more source