Condensed tannins. 6. Biochemical and stereochemical interrelationships of (+)-fustin from black-wattle heartwood (Acacia mollissima)*
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Antioxidant activity of extracts from Acacia confusa bark and heartwood.
The antioxidant activity of extracts from bark and heartwood of Acacia confusa was evaluated by various antioxidant assays, including free radical and superoxide radical scavenging assays and lipid peroxidation assay as well as hydroxyl radical-induced DNA strand scission assay. In addition, an ex vivo antioxidant assay using a flow cytometric technique was also employed in this study. The resu...
متن کاملCondensed tannins. 20. Chromophoric properties of flavan-4-ols, flavan-3,4-diols and condensed tannins.
Brown, B. R. & MacBride, J. A. H. (1963). Chem. & Ind. p. 1037. Clark-Lewis, J. W. & Jackman, L. M. (1961). Proc. chem. Soc. p. 165. Clark-Lewis, J. W., Jackman, L. M. & Williams, L. R. (1962). J. chem. Soc. p. 3858. Clark-Lewis, J. W. & Katekar, G. F. (1962). J. chem. Soc. p. 4502. Clark-Lewis, J. W. & Mortimer, P. I. (1960). J. chem. Soc. p. 4106. Conroy, H. (1960). Advanc. org. Chem. 2, 308....
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Tannins are plant-derived polyphenols with antimicrobial effects. The mechanism of tannin toxicity towards Escherichia coli was determined by using an extract from Acacia mearnsii (Black wattle) as a source of condensed tannins (proanthocyanidins). E. coli growth was inhibited by tannins only when tannins were exposed to oxygen. Tannins auto-oxidize, and substantial hydrogen peroxide was genera...
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Contents of total polyphenols, condensed tannins and proanthocyanidins, and their stability to various pH values and temperatures were studied in Mexican blueberry, cuautecomate fruit, garambullo fruit, aubergine, coffee pulp and residues of black grapes. Several aqueous extracts, obtained through a one-pass-extraction process, were analyzed using liquid chromatography in order to quantify the ...
متن کاملAntioxidant potential of polyphenols and tannins from burs of Castanea mollissima Blume.
Spiny burs of Castanea mollissima Blume (Chinese chestnut) are usually discarded as industrial waste during post-harvesting processing. The objective of this study was to establish an extraction and isolation procedure for tannins from chestnut burs, and to assess their potential antioxidant activity. Aqueous ethanol solution was used as extraction solvent, and HPD 100 macroporous resin column ...
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ژورنال
عنوان ژورنال: Biochemical Journal
سال: 1960
ISSN: 0306-3283
DOI: 10.1042/bj0770315