Results 281 to 290 of about 46,558 (333)
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Flavanols and Proanthocyanidins
2014There 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 +2 more
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Proanthocyanidins in the Apple
Journal of Food Science, 1966SUMMARYA study was conducted on the acetone‐ and ethyl‐acetate‐extractable flavan polyphenols of Waldhöfler apples, an astringent‐tasting juice variety. The extracts were examined by cellulose thin‐layer chromatography with 5% n‐butanol and n‐butanol—acetic acid—water (BAW) as the developing solvents.
G. Senn, H. Neukom, J. P. Buren
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Combinatorics of proanthocyanidins in wine
The Analyst, 2019Condensed 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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Healthy properties of proanthocyanidins
BioFactors, 2010AbstractProanthocyanidins, 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
Noemí Boqué +4 more
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Synthesis of A-type Proanthocyanidins and their Analogues. A Comprehensive Review.
Journal of Agricultural and Food Chemistry, 2020Proanthocyanidins (PACs) are oligomers or polymers composed of units of flavanols. A-type proanthocyanidins are a subclass of PACs characterized by the presence of at least a double linkage between two consecutive monomers of flavanol.
A. Alejo-Armijo, S. Salido, J. Altarejos
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Biosynthesis of proanthocyanidins
Journal of the Chemical Society, Chemical Communications, 1975The 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.
Edward J. Birch, Edmon Wong
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Chromatography of Proanthocyanidins
1989Current 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 ...
Richard F. Helm +4 more
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Food & Function, 2020
Abnormal lipid metabolism in macrophages leads to atherosclerosis (AS). Excessive LDL cholesterol uptake by macrophages in the aortic endothelium leads to formation of foam cells.
D. Shao +9 more
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Abnormal lipid metabolism in macrophages leads to atherosclerosis (AS). Excessive LDL cholesterol uptake by macrophages in the aortic endothelium leads to formation of foam cells.
D. Shao +9 more
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Conformations of Proanthocyanidins
1992The 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 ...
Richard W. Hemingway +4 more
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Plant proanthocyanidins. Part II. Proanthocyanidin-A2 and its derivatives
Journal of the Chemical Society, Perkin Transactions 1, 1974The 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 Greatbanks +3 more
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