Results 241 to 250 of about 30,058 (282)

Healthy properties of proanthocyanidins

BioFactors, 2010
AbstractProanthocyanidins, also named condensed tannins, are the result of flavanols condensation. Oligomers and polymers of proanthocyanidins can widely be found in the plant kingdom, as in fruits and berries, seeds, flowers, and leafs. They have a putative role as antioxidants, and they affect the inflammatory process via calcium‐dependent release of
Rocío, de la Iglesia, Fermín I, Milagro, Javier, Campión, Noemí, Boqué, J Alfredo, Martínez   +4 more
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Proanthocyanidins ofPolygonum coriarium

Chemistry of Natural Compounds, 1969
The roots ofPolygonum coriarum have yielded two oligomeric proanthocyanidins, T1 and T2, and their structures have been established: 3-O-galloyl-7-O-[O-(6-O-galloyl)-β-D-glucopyranosyl]-(−)-epigallocatechin-(4β-8)-(−)-epicatechin-(4β-8)-(−)-epicatechin-(4β-8)-(−)-epigallocatechin 3-O-gallate (T1) and (−)-epicatechin-(4β-8)-[3-O-galloyl ...
Sh. Yu. Islambekov, A. K. Karimdshanov, A. I. Ismailov, A. S. Sadykov   +3 more
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Plant proanthocyanidins. Part II. Proanthocyanidin-A2 and its derivatives

Journal of the Chemical Society, Perkin Transactions 1, 1974
The 2,7″-epoxy-4,8″-biflavan structure (1) has been deduced for the natural proanthocyanidin-A2 on the basis of spectroscopic (13C and 1H n.m.r.) and chemical evidence. Spectroscopic data are also outlined which lead, in association with biogenetic arguments, to a proposal (1a) for the absolute stereochemistry of the natural product.
David Jacques, Edwin Haslam, Geoffery R. Bedford, David Greatbanks   +3 more
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Flavanols and Proanthocyanidins

2014
There are many kinds of natural, oligo- and polymeric materials with very specific, almost unique properties. In the field of redox active secondary metabolites, the class of ‘condensed’ polyphenolic flavonoids, often referred to as proanthocyanidins or––at higher molecular weight––as tannins clearly stands out. Such substances are found in many edible
Hadi Ebrahimnejad, Torsten Burkholz, Claus Jacob   +2 more
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Proanthocyanidins ofZiziphus jujuba

Chemistry of Natural Compounds, 1997
The catechin and proanthocyanidin compositions of the leaves and bark ofZiziphus jujuba have been studied over the vegetation periods. This has led to the isolation of 16 compounds, including 8 monomeric catechins — (−)-epiafzelechin, (−)-epicatechin, (−)-epigallocatechin, (−)-epicatechin gallate, (−)-epigal-locatechin gallate, (+)-catechin ...
A. Malik, Z. A. Kuliev, Yu. A. Akhmedov, A. D. Vdovin, N. D. Abdullaev   +4 more
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Biosynthesis of proanthocyanidins

Journal of the Chemical Society, Chemical Communications, 1975
The incorporation of 4′,5,7-trihydroxydihydroflavonol into the dimeric procyanidin B-4 in Rubus idaeus indicates that both flavan-3,4-diols and flavan-3-ols are derived biogenetically from dihydroflavonols.
Edmon Wong, Edward J. Birch
openaire   +1 more source

Chromatography of Proanthocyanidins

1989
Current trends in chromatographic isolation and analyses of proanthocyanidins are reviewed. Preparative isolations by low pressure column chromatography can be carried out using a variety of gel types. Often, repeated separations are required to obtain pure compounds, and it has been found advantageous to alternate each separation with a different gel ...
Joseph J. Karchesy, Youngsoo Bae, Linda Chalker-Scott, Richard F. Helm, L. Yeap Foo   +4 more
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Proanthocyanidins in health and disease

BioFactors, 2016
AbstractProanthocyanidins (PAs) are the most abundant flavonoids in the human diet. Several epidemiological studies connect PA consumption and health benefits and the designation of PAs as healthy compounds started at the early stages of the 20th century. The beneficial health properties of PAs are attributed to their conjugated and colonic metabolites.
Cinta, Bladé, Gerard, Aragonès, Anna, Arola-Arnal, Begoña, Muguerza, Francisca Isabel, Bravo, M Josepa, Salvadó, Lluis, Arola, Manuel, Suárez   +7 more
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Conformations of Proanthocyanidins

1992
The application of high resolution 1H-NMR and empirical (MM2, MMX) as well as semiempirical (MNDO, AMI, PM3) theoretical methods in the conformational analysis of proanthocyanidins have been the subject of much study. The E:A (B-ring equatorial or axial) ratios calculated for 4-arylflavan-3-ol model compounds, carefully selected to incorporate all ...
Jan P. Steynberg, E. Vincent Brandt, Matthiam J. H. Hoffman, Richard W. Hemingway, Daneel Ferreira   +4 more
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Proanthocyanidins ofPolygonum coriarium. IV. Structures of proanthocyanidins T3 and T4

Chemistry of Natural Compounds, 1997
Two oligomeric proanthocyanidins have been isolated from the roots ofPolygonum coriarium. By a study of their physical properties and spectral characteristics and analysis of the results of chemical transformations, the chemical structures of these compounds have been established as: (−)-epicatechin-77[O-β-D-glucopyranosyl]3\(\xleftarrow{6}\) O-²-D ...
B. M. Keneshov, Z. A. Kuliev, A. D. Vdovin, N. D. Abdullaev, A. A. Nishanov   +4 more
openaire   +1 more source