Results 201 to 210 of about 17,060 (241)

The phenolics of ciders: Oligomeric and polymeric procyanidins

Journal of the Science of Food and Agriculture, 1978
AbstractCiders contain a series of procyanidins up to at least a seven‐fold degree of polymerisation, and a procyanidin tetramer based on epicatechin has been isolated by counter‐current distribution between ethyl acetate and water. Due to the shortcomings of modern methylation and mass spectrometry procedures molecular weights were determined by ...
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Degradation of procyanidins by Aspergillus fumigatus

2006
Aspergillus fumigatus was able to grow on apple-purified procyanidins (PCs). PCs concentration decreased 30% over the first 60 h of liquid fermentation. The mean degree of polymerization (DPn) of apple-purified PCs increased from 8 to 15 during the fermentation.
Contreras-Dominguez, Monica, Guyot, Sylvain, Marnet, Nathalie, Le Petit, Jean, Perraud-Gaime, Isabelle, Roussos, Sevastianios, Augur, Christopher   +6 more
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Influence of Procyanidins on the Color Stability of Oenin Solutions

Journal of Agricultural and Food Chemistry, 2002
The aim of the present work was to specify the influence of the polymerization degree on the color stability of anthocyanins using model solutions under higher thermal conditions simulating rapid food aging. Results showed that an increase in polymeric degree improves the color stability of oenin. Solutions containing a catechin tetramer, purified from
Malien-Aubert, C., Dangles, O., Amiot, Marie Josèphe   +2 more
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Occurrence of procyanidins in Nelia meyeri

Phytochemistry, 1984
Abstract A novel natural 4-arylflavan-3-ol has been obtained from leaves of Nelia meyeri . The same extract contains two procyanidin dimers, B-2 and B-5, and trimer C-1. 1 H NMR studies furnish diagnostic chemical shift parameters for determining the points of linkage in these compounds.
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Anti-ulcer activity of procyanidins preparation of water-soluble procyanidin-cimetidine complexes.

Pharmaceutica acta Helvetiae, 1990
The anti-ulcer properties of water-soluble procyanidins prepared by fermentation of tannins from Fragaria vesca were studied. Complexes of procyanidins and cimetidine were prepared. The procyanidins increased the water-solubility of the cimetidine and may prevent undesirable nitrosamine formation in the stomach as they block its cyanamide function.
B, Vennat, D, Gross, H, Pourrat, A, Pourrat, P, Bastide, J, Bastide   +5 more
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The phenolics of ciders. 1. Procyanidins

Journal of the Science of Food and Agriculture, 1974
AbstractThe dimeric procyanidins, B2, B1 and B5, and two procyanidin trimers based on (‐)‐epicatechin were isolated from cider by column chromatography on Sephadex LH20 and counter‐current distribution between ethyl acetate and water. The concentrations of these and the other phenolic components in some experimental ciders were estimated by ...
Andrew G. H. Lea, Colin F. Timberlake
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Procyanidins

2022
Mehmet Resat Atilgan, Oguz Bayraktar
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Biogenetically patterned synthesis of procyanidins

Journal of the Chemical Society, Chemical Communications, 1974
The synthesis of the natural procyanidins B1 (1) and B2 (2) is described and the biogenetic implications of the mode of synthesis are discussed.
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Procyanidins are not bioavailable in rats fed a single meal containing a grapeseed extract or the procyanidin dimer B3.

The British journal of nutrition, 2002
Flavanols are the most abundant flavonoids in the human diet where they exist as monomers, oligomers and polymers. In the present study, catechin, the procyanidin dimer B3 and a grape-seed extract containing catechin, epicatechin and a mixture of procyanidins were fed to rats in a single meal.
Donovan, J.L., Manach, Claudine, Rios, Laurent, Morand, Christine, Scalbert, Augustin, Remesy, Christian   +5 more
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Symmetry and promiscuity in procyanidin biochemistry

Phytochemistry, 1977
Abstract The occurrence and significance of procyanidins in the plant kingdom are reviewed. Stages in the elucidation of the structure and the stereochemistry of the procyanidins are outlined. Preferred helical conformations for the procyanidins, arising from the steric hindrance to rotation about the interflavan bond, are described.
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