Results 151 to 160 of about 2,376 (202)

Hydrolyzed Tannins from Geranium pusillum

Chemistry of Natural Compounds, 2003
The polyphenolic compound 1-O-galloyl-3,6-hexahydroxybiphenyl-D-galactopyranoside (pusilagin) was isolated from the aerial part. The tannin structure was established using acid hydrolysis and IR, PMR, and 13C NMR spectral methods.
K. B. Kobakhidze, M. D. Alaniya
openaire   +1 more source

Chemical Studies of Proanthocyanidins and Hydrolyzable Tannins

Antioxidants & Redox Signaling, 2001
We investigated a number of natural polyphenols representing flavan-3-ols, gallotannins, and ellagitannins with regard to their antioxidant potential. For this purpose we used pulse radiolysis to determine scavenging rate constants with hydroxyl radicals and decay rates of the respective aroxyl radicals and EPR spectroscopy to identify the radicals ...
W, Bors, L Y, Foo, N, Hertkorn, C, Michel, K, Stettmaier   +4 more
openaire   +2 more sources

Biosynthesis and subcellular distribution of hydrolyzable tannins

Phytochemistry, 2001
Pathways to complex gallotannins have been elucidated by enzyme studies, indicating that beta-glucogallin is required as principal acyl donor. Evidence for the in vitro oxidation of pentagalloylglucose, the pivotal metabolite in this sequence, to ellagitannins, is presented. Immunohistochemical studies with antibodies raised against pentagalloylglucose
P, Grundhöfer, R, Niemetz, G, Schilling, G G, Gross   +3 more
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Hydrolyzable Tannins and Related Polyphenols

1995
Recent advances in isolation and structure elucidation of several hundred of new polyphenolic compounds of the tannin class using new techniques (1) have altered the definition of a tannin, at least that of a hydrolyzable tannin. Thus the term tannin now includes all polyphenolic compounds of defined chemical structure as well as the whole group of ...
T, Okuda, T, Yoshida, T, Hatano
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Cytotoxic Hydrolyzable Tannins from Balanophora japonica

Journal of Natural Products, 2008
Four hydrolyzable tannins named balanophotannins D-G ( 1- 4) were isolated from the aerial parts of the parasitic plant Balanophora japonica. Their structures were characterized on the basis of spectroscopic and chemical evidence. Balanophotannins D-G contain an oxidized hexahydroxydiphenoyl (HHDP) group. The absolute configurations of balanophotannins
Zhi-Hong, Jiang, Xiao-Yun, Wen, Takashi, Tanaka, Shao-Yu, Wu, Zhongqiu, Liu, Hiromi, Iwata, Yoko, Hirose, Shuguang, Wu, Isao, Kouno   +8 more
openaire   +2 more sources

Lignin-Hydrolyzable Tannin Interactions in Wood

Journal of Agricultural and Food Chemistry, 1997
A series of investigations were carried out to ascertain the relationship between lignin and hydrolyzable tannins in white oak (Quercus alba) and American chestnut (Castanea dentata) milled wood lignins as well as synthetic co-DHPs. Acidolysis and chromatographic analysis of chestnut and white oak milled wood lignins revealed the presence of ellagic ...
Richard F. Helm, Thilini D. Ranatunga, Mudit Chandra   +2 more
openaire   +1 more source

Hydrolyzable tannin analysis in food

Food Chemistry, 2012
The discovery of plant polyphenols in food is perhaps one of the biggest breakthroughs in modern food science. Plant polyphenols are known for their role in food quality and safety, since they contribute significantly to taste, flavour, colour, stability etc., while they are increasingly recognised as important factors in long-term health, contributing
openaire   +3 more sources

Hydrolyzed Tannin from Euphorbia glareosa Leaves

Chemistry of Natural Compounds, 2005
Hydrolyzed tannin (I), the structure of which was established using chemical investigations and UV, IR, PMR and 13C NMR spectra, was isolated from Euphorbia glareosa leaves.
L. G. Gvazava, M. D. Alaniya
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Phloroglucinol diglycosides accompanying hydrolyzable tannins from Kunzea ambigua

Phytochemistry, 2008
Six phloroglucinol diglucosides-kunzeaphlogins A-F (1-6) and a hydrolyzable tannin, kunzeatannin A (7)-were isolated along with 10 known polyphenols from the leaf extract of Kunzea ambigua. Structural elucidation of these compounds was based on spectroscopic analyses and chemical properties.
Naoki, Kasajima, Hideyuki, Ito, Tsutomu, Hatano, Takashi, Yoshida   +3 more
openaire   +2 more sources

Anti-inflammatory Hydrolyzable Tannins from Myricaria bracteata

Journal of Natural Products, 2015
Twelve hydrolyzable tannins were obtained from the twigs of Myricaria bracteata, including two new hellinoyl-type dimers, bracteatinins D1 (1) and D2 (2); a new hellinoyl-type trimer, bracteatinin T1 (3); two known monomers, nilotinin M4 (4) and 1,3-di-O-galloyl-4,6-O-(aS)-hexahydroxydiphenoyl-β-d-glucose (5); six known dimers, tamarixinin A (6 ...
Jia-Bao, Liu, Ya-Si, Ding, Ying, Zhang, Jia-Bao, Chen, Bao-Song, Cui, Jin-Ye, Bai, Ming-Bao, Lin, Qi, Hou, Pei-Cheng, Zhang, Shuai, Li   +9 more
openaire   +2 more sources