Nonenzymatic C-glycosylation of flavan-3-ols by oligo- and polysaccharides.

Nonenzymatic C-glycosylation of flavan-3-ols by oligo- and polysaccharides. Research Abstract Details 

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Nonenzymatic C-glycosylation of flavan-3-ols by oligo- and polysaccharides. Abstract Text:

Timo Stark,Daniela Keller,Kerstin Wenker,Hedda Hillmann,Thomas Hofmann,Timo Stark,Daniela Keller,Kerstin Wenker,Hedda Hillmann,Thomas Hofmann,

Model reactions between the polysaccharide amylose and the polyphenol (-)-epicatechin followed by partial enzymatic hydrolysis of the reaction products formed led to the detection of mono- and oligo-C-glucosylated flavan-3-ols by means of LC-MS/MS experiments. To confirm the structure of these putative flavan-3-ol/oligosaccharide conjugates, (-)-epicatechin was reacted with maltose and maltotriose, respectively, giving rise to a series of previously unreported flavan-3-ol/maltose and flavan-3-ol/maltotriose conjugates, namely, (-)-epicatechin-8-C-beta-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranoside, (-)-catechin-8-C-beta-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranoside, (-)-catechin-6- C-beta-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranoside, (-)-catechin-8-C-beta-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranoside, (-)-catechin-6-C-beta-D-glucopyranosyl-(4-->1)- O-alpha-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranoside, and (-)-epicatechin-6/8-C-beta-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranosyl-(4-->1)-O-alpha-D-glucopyranoside. Furthermore, quantitative analysis of flavan-3-ol-C-glucosides in an enzymatic total hydrolysate using a newly developed stable isotope dilution assay (SIDA) enabled a first insight into the yield of the formation of polyphenol/polysaccharide cross-links, for example, an amount of 14.0, 9.0, and 0.15 micromol of flavan-3-ol-6-C-beta-D-glucopyranoside, flavan-3-ol-8-C-beta-D-glucopyranoside, and flavan-3-ol-6- C,8-C-beta-D-glucopyranoside were per mmol (-)-epicatechin when reacted with amylose.

Nonenzymatic C-glycosylation of flavan-3-ols by oligo- and polysaccharides. Publishing Authors By Initials

T Stark,D Keller,K Wenker,H Hillmann,T Hofmann,T Stark,D Keller,K Wenker,H Hillmann,T Hofmann,

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Nonenzymatic C-glycosylation of flavan-3-ols by oligo- and polysaccharides. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of agricultural and food chemistry

VOLUME: 55

Page Numbers: 9685-97

Journal Abbreviation: J. Agric. Food Chem.

ISSN: 0021-8561

DAY: 12

MONTH: 10

YEAR: 2007

Nonenzymatic C-glycosylation of flavan-3-ols by oligo- and polysaccharides. Information

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LANGUAGE: eng

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AFFILIATION: Institut für Lebensmittelchemie, Universität Münster, Corrensstrasse 45 D-48149 Münster, Germany.

Country: United States

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MEDLINETA: J Agric Food Chem

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