Results 251 to 260 of about 37,768 (305)

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
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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
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Combinatorics of proanthocyanidins in wine

The Analyst, 2019
Condensed tannin are polymers comprised of procyanidin and prodelphinidin units found in wine, chocolate, apples and many other foods.
Jonathan R. Cave, Andrew L. Waterhouse
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Phytochemistry of proanthocyanidins

Phytochemistry, 1975
Abstract Procyanidin A from Aesculus hippocastanum differs from the B type procyanidin in that it is difficultly soluble in water, gives a higher yield of cyanidin when heated in butanolic HCl and the production of cyanidin continues beyond the 2 hr period sufficient for maximum production in the case of B type procyanidin. Anthocyanidin production
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Oligomeric Proanthocyanidins from Mangosteen Pericarps

Journal of Agricultural and Food Chemistry, 2007
Oligomeric proanthocyanidins were extracted from mangosteen pericarps and fractionated by a Sephadex LH-20 column to give 0.66% yield (dry matter). (13)C and (1)H NMR signals showed the presence of predominantly procyanidins together with a few prodelphinidin units along with small amounts of stereoisomers of afzelechin/epiafzelechin, catechin ...
Fu, C., Loo, A.E.K., Chia, F.P.P., Huang, D.   +3 more
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