Quercetin 3-<9- -glucoside

For example, the mouth is exposed to a substantial, albeit transient and spasmodic, flux of PPT. It has been reported that quercetin-4 -glucoside, quercetin-3-glucoside, phloretin-2 -glucoside, and genistein-7-glucoside can be rapidly hydrolyzed, and quercetin-3-rutinoside... 

Schneider, H., Simmering, R., Hartmann, L., and Blaut, M., Degradation of quercetin-3-glucoside in gnotobiotic rats associated with human intestinal bacteria, J. Appl Microbiol, 89, 1027, 2000. 

Wolffram, S., Block, M., and Ader, P., Quercetin-3-glucoside is transported by the glucose carrier SGLTl across the brush border membrane of rat small intestine, J. Nutr., 132, 630, 2002. 

Pinus banksiana Rutin and quercetin-3-glucoside Reduced growth and increased 372... 

Day, A.J. et al.. Absorption of quercetin-3-glucoside and quercetin-4 -glucoside in the rat small intestine the role of lactase phlorizin hydrolase and the sodium-dependent glucose transporter, Biochem. Pharmacol., 65, 1199, 2003. 

Two catechins, ( + )catechin and ( — )epicatechin, and two leucoanthocyanins were isolated from Bartlett pears by Nortje (165).. Durkee et al. (166) identified arbutin (p-hydroxphenyl-/ -D-glucoside) in mature and immature pears. Several flavanol glycosides such as quercetin 3-glucoside, isorhamnetin-3-glucoside, isorhamnetin-3-rutinoside, isorham-netin-3-galactoside, and quercetin-7-xyloside were identified by Duggan (167). 

Chemicals. All solvents and acids used were analytical grade, except the MeOH and MeCN which were of HPLC grade, purchased from PROLABO (Fontenay-sous-bois, France). Malvidin 3-glucoside chloride and quercetin -3-glucoside were... 

Polyphenol Analyses. Skin and seed extracts were prepared as described elsewhere (4,15). Flavonol and anthocyanin composition of grape skin extracts and wines were determined by direct reversed-phase HPLC analysis with diode array detection. The chromatographic conditions were the same as described earlier (16) but the formic acid concentration in the elution solvents was raised to 5% to improve anthocyanin resolution. Quantitations were based on peak areas, using mdvidin-3-glucoside (at 530nm) and quercetin-3-glucoside (at 360 nm) response factors, respectively, for anthocyanins and flavonols. 

Sesink, A.L., O Leary, K.A., and Hollman, P.C., Quercetin glucuronides but not glucosides are present in human plasma after consumption of quercetin-3-glucoside or quercetin-4 -glucoside, J. Nutr, 131, 1938, 2001. 

In the chromatogram recorded at 320 nm in the HCTA analysis (paragraph 2.4.2) it is also possible to identify the trans-resveratrol gluco-side peak. The cis isomer is detected at 280 nm, but separation from quercetin-3-glucoside and rutin needs optimization of the chromatographic conditions (column and solvent). 

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