Results 171 to 180 of about 7,593 (221)

Cytotoxic ellagitannins from Reaumuria vermiculata

Fitoterapia, 2012
Three ellagitannins and one disulfated flavonol were isolated from the aerial parts of Reaumuria vermiculata L. Besides that, 16 known compounds were characterized as well. The structures of all compounds were elucidated on the basis of spectroscopic data including 1D and 2D NMR and ESI HR-FTMS. The in vivo antioxidant activity using the oxygen radical
Mahmoud A, Nawwar, Nahla A, Ayoub, Mohamed A, El-Rai, Fatma, Bassyouny, Eman S, Mostafa, Ahmed M, Al-Abd, Manuela, Harms, Kristian, Wende, Ulrike, Lindequist, Michael W, Linscheid   +9 more
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Synthesis of ellagitannin natural products

Natural Product Reports, 2011
Covering: up to the beginning of 2011 A detailed overview of chemical synthesis approaches to ellagitannins is provided. This unique family of natural products, which belong to the hydrolysable tannin class of plant polyphenols, today features nearly 1000 members that have been fully characterised, from monomeric to oligomeric and complex ...
Laurent, Pouységu, Denis, Deffieux, Gaëlle, Malik, Anna, Natangelo, Stéphane, Quideau   +4 more
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Oxidation of the Oak Ellagitannin, Vescalagin

Journal of Natural Products, 2020
Vescalagin (1) is a major ellagitannin from young spring leaves of Quercus glauca; however, the amount of 1 decreases as the leaves mature with a concomitant rise in the levels of catechin (3) and procyanidins. In this report, the chemical mechanism responsible for the degradation of 1 was investigated.
Hatsumi Wakamatsu, Yosuke Matsuo, Mohamed Omar, Yoshinori Saito, Koyo Nishida, Takashi Tanaka   +5 more
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Fungal biodegradation of pomegranate ellagitannins

Journal of Basic Microbiology, 2013
AbstractEllagitannins (ETs) are phytochemicals derived from secondary metabolism associated to defense system, with complex chemical structures, which have high participation during all stages of protection against microbial infection. In this study, we report the fungal biodegradation of a bioactive ET, named punicaline which was recovered and ...
Juan A, Ascacio-Valdés, José J, Buenrostro, Reynaldo, De la Cruz, Leonardo, Sepúlveda, Antonio F, Aguilera, Arely, Prado, Juan C, Contreras, Raúl, Rodríguez, Cristóbal N, Aguilar   +8 more
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Enzymology of Gallotannin and Ellagitannin Biosynthesis

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Ruth, Niemetz, Georg G, Gross
openaire   +2 more sources

Ellagitannin Chemistry. First Total Synthesis of the 2,3- and 4,6-Coupled Ellagitannin Pedunculagin

The Journal of Organic Chemistry, 1996
The biomimetic synthesis of pedunculagin (1) was accomplished through the sequential diastereoselective formation of two biphenyl C-C bonds. The synthesis strategy employed is predicated on extensive conformational modeling and involves initial oxidative coupling of the galloyl moieties at the O(2) and O(3) positions of an appropriately protected ...
Ken S., Feldman, Randall S., Smith
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Pharmacologically Active Ellagitannins from Terminalia myriocarpa

Planta Medica, 2002
A new ellagitannin, methyl (S)-flavogallonate (14) along with fourteen known compounds, gallic acid, methyl gallate, ethyl gallate, 2,3-di-O-[( S)-4,5,6,4',5',6'-hexahydroxybiphenyl-2,2'-diyldicarbonyl]-(alpha/beta)-D-glucopyranose (4), vitexin, isovitexin, orientin, iso-orientin, kaempferol 3-O-beta-D-rutinoside, rutin, neosaponarin, ellagic acid ...
Mohamed S A, Marzouk, Sayed A A, El-Toumy, Fatma A, Moharram, Nagwa M M, Shalaby, Amany A E, Ahmed   +4 more
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Ellagitannins - nature, occurrence and dietary burden

Journal of the Science of Food and Agriculture, 2000
The occurrence of ellagitannins in common foodstuffs is limited to a few fruit and nut species. Dietary intake of ellagitannins is largely explained by the consumption of strawberries, raspberries and blackberries. No reliable figures are available for the ellagitannin burden, but it will probably not exceed 5 mg day−1.
Clifford, M.N., Scalbert, Augustin
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Ellagitannins from Tellima grandiflora

Phytochemistry, 1976
Abstract Three ellagitannins present in Tellima grandiflora have been isolated and partly identified. Two are 2,3-digallyl-4,6-hexahydroxydiphenoyl -β- d -glucopyranose and 1,2,3-trigallyl-4,6-hexahydroxydiphenoyl-β- d -glucopyranose. The third is complex, with five gallyl and two hexahydroxydiphenyl residues; hydrolysis yielded glucose, gallic ...
Cornelius K. Wilkins, Bruce A. Bohm
openaire   +1 more source

Recent progress in ellagitannin chemistry

Phytochemistry, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
openaire   +2 more sources