Results 141 to 150 of about 4,686 (177)
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Detection and determination of ellagitannins
Phytochemistry, 1972Abstract Ellagic acid combined in the form of esters of hexahydroxydiphenic acid (HHDP) can be quantitatively determined by taking advantage of the formation of a coloured product with nitrous acid. Under specified conditions, monoesters with glucose have molecular absorption coefficients between 2150 and 2300 at 600 nm.
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Highly Oxidized Ellagitannins and Their Biological Activity
1999Polyphenols such as flavonoids and tannins in medicinal plants, foods, and beverages are attracting considerable attention in human health care because of their biologically multifunctional properties. These properties include antioxidant activity due to radical scavenging action and anti-HIV, antitumor activities, and inhibitory effects on various ...
T, Yoshida, T, Hatano, H, Ito, T, Okuda
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Food Ellagitannins–Occurrence, Effects of Processing and Storage
Critical Reviews in Food Science and Nutrition, 2008Interest in ellagitannins and ellagic acid has increased over the past few years due to its properties as a micronutrient. Ellagitannins are complex plant polyphenols composed of hexahydroxydiphenoyl moieties esterified to a sugar. Fruits (especially berries and nuts) are rich sources of ellagitannins and ellagic acid, a hydrolytic product of ...
Mentes, Oezay +2 more
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Ellagitannins from Tellima grandiflora
Phytochemistry, 1976Abstract Three ellagitannins present in Tellima grandiflora have been isolated and partly identified. Two are 2,3-digallyl-4,6-hexahydroxydiphenoyl -β- d -glucopyranose and 1,2,3-trigallyl-4,6-hexahydroxydiphenoyl-β- d -glucopyranose. The third is complex, with five gallyl and two hexahydroxydiphenyl residues; hydrolysis yielded glucose, gallic ...
Cornelius K. Wilkins, Bruce A. Bohm
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Chemistry and Biology of Ellagitannins
2009Ellagitannins Renewed the Concept of Tannin (T Okuda et al.) Structural Diversity and Antimicrobial Activities of Ellagitannins (T Yoshida et al.) Biosynthesis of Ellagitannins: Old Ideas and New Solutions (G Gross) Physicochemical Properties and Biomimetic Reactions of Ellagitannins (T Tanaka et al.) Total Synthesis of Ellagitannins (K Khanbabaee ...
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Journal of the American Chemical Society, 1994
Tellimagrandin I was synthesized by two different biogenetically patterned routes. One route featured diastereoselective galloyl ester coupling between the O(4) and O(6) galloyl moieties in a glucose-derived substrate bearing additional protected galloyl groups on 0(2) and 0(3).
Ken S. Feldman +2 more
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Tellimagrandin I was synthesized by two different biogenetically patterned routes. One route featured diastereoselective galloyl ester coupling between the O(4) and O(6) galloyl moieties in a glucose-derived substrate bearing additional protected galloyl groups on 0(2) and 0(3).
Ken S. Feldman +2 more
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Prospects and Progress in Ellagitannin Synthesis
1999The ellagitannin family of secondary plant metabolites presents a rich array of challenges for contemporary organic synthesis. The myriad intra- and inter-molecular coupling modes available to galloyl rings appended to a glucose core, along with a range of post-coupling modifications, define a vast matrix of bond-forming possibilities, many of which ...
Ken S. Feldman +4 more
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Ellagitannin Chemistry. The First Total Synthesis of a Dimeric Ellagitannin, Coriariin A
Journal of the American Chemical Society, 2000Ken S. Feldman, Michael D. Lawlor
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