Results 161 to 170 of about 9,469 (180)

Condensed and Hydrolysable Tannins as Antioxidants Influencing the Health

Mini-Reviews in Medicinal Chemistry, 2008
Natural polyphenols are a wide class of secondary plant metabolites and represent an abundant antioxidant component of human diet. An important, but often neglected group of natural polyphenols, are tannins. This review offers a general description of chemistry of both hydrolysable and condensed tannins (proanthocyanidins), the mechanisms of their ...
Vit, Koleckar, Katerina, Kubikova, Zuzana, Rehakova, Kamil, Kuca, Daniel, Jun, Ludek, Jahodar, Lubomir, Opletal   +6 more
openaire   +2 more sources

Differential scanning calorimetry of hydrolysed mangrove tannin

Polymer International, 2000
Mangrove-bark-tannin adhesives are potential substitutes for phenol–formaldehyde (PF) wood-bonding adhesives which are derived from petroleum, a finite natural resource. However, mangrove-bark-tannin adhesive exhibits poor adhesive properties, including brittleness, poor wet strength, and poor wood penetration.
S Sowunmi, R?O Ebewele, O Peters, A?H Conner   +3 more
openaire   +1 more source

Hydrolysable tannins and related compounds from Castanea mollissima

Phytochemistry, 1988
Abstract A chemical examination of the leaves of Castanea mollissima has led to the characterization of four new polyphenolic compounds, castamollissin, isochesnatin, isochestanin and castanin. In addition, the occurrence of 20 known hydrolysable tannins and related compounds was demonstrated.
Huiming Feng, Gen-Ichiro Nonaka, Itsuo Nishioka   +2 more
openaire   +1 more source

Hydrolysable tannins as chemotaxonomic markers in the rosaceae

Phytochemistry, 1992
Abstract A HPLC survey of leaves of 80 plants (62 species, 15 hybrids, one variety and two cytotypes) from 18 genera of four subfamilies of Rosaceae, using five oligomeric hydrolysable tannins, five monomeric hydrolysable tannins, and chlorogenic acid as reference compounds, showed that the oligomers can be used as chemotaxonomic markers for the ...
Takuo Okuda, Takashi Yoshida, Tsutomu Hatano, Mayumi Iwasaki, Makiko Kubo, Teruyo Orime, Masao Yoshizaki, Naohiro Naruhashi   +7 more
openaire   +1 more source

Two macrocyclic hydrolysable tannin dimers from Eugenia uniflora

Phytochemistry, 1997
Abstract Eugeniflorins D1 and D2 new hydrolysable tannin dimers, were isolated, together with four known polyphenols, from Eugenia uniflora leaves. Their macrocyclic structures were elucidated from spectral and chemical evidence.
null Mei-Hsien Lee, Saori Nishimoto, null Ling-Ling Yang, null Kun-Ying Yen, Tsutomu Hatano, Takashi Yoshida, Takuo Okuda   +6 more
openaire   +1 more source

Polyurethanes from hydrolysable tannins obtained without using isocyanates

Industrial Crops and Products, 2014
Abstract Hydrolysable chestnut tannins, which contain several hydroxyl groups, were reacted with dimethyl carbonate, and then with hexamethylenediamine. The dried product was analyzed in MALDI-TOF, 13 C NMR and FTIR spectrometry. The spectra revealed the presence of urethane functions and their yield was relatively high.
M. Thébault, A. Pizzi, S. Dumarçay, P. Gerardin, E. Fredon, L. Delmotte   +5 more
openaire   +1 more source

Analysis of condensed and hydrolysable tannins from commercial plant extracts

Journal of Pharmaceutical and Biomedical Analysis, 2006
High performance liquid chromatography (HPLC)/DAD and MS qualitative and quantitative analyses of polyphenols, hydrolysable and condensed tannins from Pinus maritima L. and tannic acid (TA) extracts were performed using normal and reverse phase. Normal-phase HPLC was more suitable for pine bark (PBE) and tannic acid extracts analysis.
ROMANI, ANNALISA, IERI, FRANCESCA, B. Turchetti, MULINACCI, NADIA, VINCIERI, FRANCO FRANCESCO, P. Buzzini   +5 more
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Coriariin M, a trimeric hydrolysable tannin with dehydrodigalloyl and valoneoyl groups as linking units, and accompanying dimeric hydrolysable tannins from Coriaria japonica

Phytochemistry, 2018
Three oligomeric hydrolysable tannins, coriariins K, L, and M, which were previously undescribed, together with five known hydrolysable tannins were isolated from dried leaves of Coriaria japonica. Their structures were determined based on 1D and 2D NMR spectroscopy, HR-ESI-MS, and ECD spectroscopy experiments. Among the isolated compounds, coriariin M
Yuuki, Shimozu, Takayasu, Hirai, Tsutomu, Hatano   +2 more
openaire   +2 more sources

Tolerance mechanisms of streptococci to hydrolysable and condensed tannins

Animal Feed Science and Technology, 2005
Abstract In vitro growth assays demonstrated that Streptococcus bovis JB1 was sensitive to tannic acid (TA), acacia (AT), and calliandra tannins (CT), while Streptococcus gallolyticus 2.2 was tolerant. At low levels of tannin, S. bovis JB1 exhibited some tolerance but this was always less than for S. gallolyticus 2.2.
Krause, D. O., Smith, W. J. M., Brooker, John Douglas, McSweeney, Christopher Simon   +3 more
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Phyllanthusiin D, an unusual hydrolysable tannin from Phyllanthus amarus

Phytochemistry, 1992
Abstract An unusual ellagitannin was isolated from the biologically active polar fraction of Phyllanthus amarus. Its structure was established as 1-galloyl-2,4-(acetonyl-dehydrohexahydroxydiphenoyl)-3,6-hexahydroxydiphenoylglucopyranoside by chemical and spectroscopic methods.
L. Yeap Foo, Herbert Wong
openaire   +1 more source