Hydrolyzable tannins from Balanophora polyandra
نویسندگان
چکیده
منابع مشابه
Tannins of Constant Structure in Medicinal and Food Plants—Hydrolyzable Tannins and Polyphenols Related to Tannins
In addition to the commonly used classification as hydrolyzable tannins and condensed tannins, tannins can also be categorized into two other types: polyphenols of constant chemical structure (Type A) and polyphenols of variable composition (Type B). Both types of tannins and related polyphenols account for a large part of plant polyphenols, but accurate structure-activity correlations on a mol...
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Until now, the recommended procedure for measuring hydrolyzable tannins has been to mix the reagent and sample, subject the mixture to a certain amount of chill, allow the reaction to continue for some time at a higher temperature and then measure the absorbance of the colored solution. The effect of different chill conditions has been studied by many workers but the effect of conditions after ...
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Three hydrolyzable tannins, nobotannins L, M and N, were isolated from the water-soluble portion of the leaf extract of Tibouchina semidecandra, and their trimeric structures were elucidated from spectral and chemical evidence. Nobotanins L and N exist as equilibrium mixtures of four anomers due to the presence of two unacylated anomeric centers.
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Hydrolyzable tannins were found to be the active cytotoxic constituents of three Greek Cytinus taxa: Cytinus ruber, Cytinus hypocistis subsp. hypocistis and Cytinus hypocistis subsp. orientalis. The cytotoxic activity was evaluated against a broad spectrum of cancer cell lines. The structure of the active compounds was investigated with NMR and electrospray-MS/MS techniques.
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The enzyme, ß-glucogallin: 1,2,3,6-tetra-O-galloyl-ß-D-glucose 4-O-galloyltransferase, which catalyzes the last common step in the biosynthesis of the two subclasses of hydrolyz able tannins, i.e. gallotannins and ellagitannins, was purified 868-fold from leaves of peduncu late oak ( Quercus robur, syn. Q. pedunculata) to apparent homogeneity. Polyclonal antibod ies against this pivotal enzy...
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ژورنال
عنوان ژورنال: Acta Pharmaceutica Sinica B
سال: 2013
ISSN: 2211-3835
DOI: 10.1016/j.apsb.2012.12.003