Results 191 to 200 of about 7,397 (236)

Flow injection system for hydrolysable tannin determination

Microchemical Journal, 2006
Abstract A flow injection system was proposed to evaluate the transient product of a colorimetric reaction between hydrolysable tannin and potassium iodate (KIO 3 ) solution. The system optimization was accomplished by using statistical methods based on experimental design.
Carla M. Bossu, Edilene C. Ferreira, Fernanda S. Chaves, Eveline A. Menezes, Ana Rita A. Nogueira   +4 more
openaire   +3 more sources

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   +3 more sources

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   +4 more sources

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   +3 more sources

Antimicrobial and Antiviral Activity of Hydrolysable Tannins

Mini-Reviews in Medicinal Chemistry, 2008
Hydrolysable tannins (HTs), secondary metabolites widely distributed in the plant kingdom, are generally multiple esters of gallic acid with glucose. HTs have been shown to be effective antagonists against viruses, bacteria and eukaryotic microorganisms.
P. Buzzini, P. Arapitsas, M. Goretti, E. Branda, B. Turchetti, PINELLI, PATRIZIA, IERI, FRANCESCA, ROMANI, ANNALISA   +7 more
openaire   +4 more sources

Oligomeric hydrolysable tannins from Tibouchina multiflora

Phytochemistry, 1999
Two hydrolysable tannins, nobotanin O and nobotanin P, were isolated from the leaf extract of Tibouchina multiflora (Melastomataceae) and their dimeric and tetrameric structures elucidated on the basis of spectral data and chemical correlations with nobotanin B and K, respectively. Thirteen known hydrolysable tannins including nobotanins A, B, C and J,
T, Yoshida, Y, Amakura, N, Yokura, H, Ito, J H, Isaza, S, Ramirez, D P, Pelaez, S S, Renner   +7 more
openaire   +2 more sources

New hydrolysable tannin from Cibotium barometz.

Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica, 2013
To study the chemical constituents from Cibotium batometz.Column chromatograph and HPLC were used to isolate and purify the compound, and the structure was elucidated on the basis of MS and NMR spectroscopic methods.A new phenolic compound, 4-O-caffeoyl-D-glucopyranose, has been isolated from the rhizome of C. barometz.
Nan, Xu, Yue, Cao, Ya-Nan, Shi, Xu, Zhong, Tian-Zhu, Jia   +4 more
openaire   +3 more sources

Hydrolysable tannins from Euphorbia thymifolia

Phytochemistry, 1990
Abstract Chemical investigation of Euphorbia thymifolia has led to the isolation and characterization of a new hydrolysable tannin named isomallotinic acid, in addition to 15 known tannins. The structure of isomallotinic acid was established on the basis of spectroscopic and chemical evidence.
Seung-Ho Lee, Takashi Tanaka, Gen-ichiro Nonaka, Itsuo Nishioka   +3 more
openaire   +1 more source

Hydrolysable tannins from Loropetalum chinense

Phytochemistry, 1993
Abstract Three new oligomeric hydrolysable tannins, loropetalins A-C, were isolated from Loropetalum chinense and their structures elucidated by spectral and chemical methods. Eighteen known tannins and related polyphenols, including oligomeric hydrolysable tannins (camelliin B and rugosins D, E and G), were also isolated.
Takashi Yoshida, Shigeharu Tanei, Yan-Ze Liu, Ke Yuan, Chun-Ru Ji, Takuo Okuda   +5 more
openaire   +1 more source

A dimeric hydrolysable tannin from Camellia oleifera

Phytochemistry, 1994
Camellioferin A, a new dimeric ellagitannin, was isolated, together with 13 known tannins, including camellins A and B, from Camellia oleifera. The structure of the new tannin elucidated by spectroscopic methods.
T, Yoshida, T, Nakazawa, T, Hatano, R C, Yang, L L, Yang, K Y, Yen, T, Okuda   +6 more
openaire   +2 more sources