The presence of the procyanidins epicatechin-( 4j3-8)-catechin. epicatechin..{ 4j3-6)-catechin. catechin( 4a-8)-catechin. epicatechin-( 4j3-8 >-epicatechin-( 4j3-8)-epicatechin-{ 4138)-catechin. and epicatechin-(4j3-8)-epicatechin-(4j3-6)catechin in tile phloem of PillU.f raeda demonstrated heterogeneity in the location of the interftavanoid bonds in oligomeric pro...

Little is known about flavonoid metabolism and excretion in man. In the present study, the urinary excretion of a major flavonoid in wine, catechin, and its metabolites, were measured after nine human subjects each consumed 120 ml red wine (RW) on one day and de-alcoholized red wine (DRW) on a separate day. Both the RW and DRW contained 120 (SEM 3) micromol catechin (35 mg). GC-MS analyses of t...

We have investigated the bacterial-dependent metabolism of ( - )-epicatechin and (+)-catechin using a pH-controlled, stirred, batch-culture fermentation system reflective of the distal region of the human large intestine. Incubation of ( - )-epicatechin or (+)-catechin (150 mg/l or 1000 mg/l) with faecal bacteria, led to the generation of 5-(3',4'-dihydroxyphenyl)-gamma-valerolactone, 5-phenyl-...

In order to investigate polymeric flavonoids, the polycondensate of catechin with glyoxylic acid (PCG) was prepared and its chemically antioxidant, cellular antioxidant (CAA) and α-glucosidase inhibitory activities were evaluated. The DPPH and ABTS radical scavenging activities and antiproliferative effect of PCG were lower than those of catechin, while PCG had higher CAA activity than catechin...

OBJECTIVES To evaluate the effects of gargling tea catechin extracts on the prevention of influenza infection in elderly nursing home residents. DESIGN A prospective study conducted for 3 months from January to March 2005. SETTINGS/LOCATION A nursing home in Japan. SUBJECTS A total of 124 elderly residents of at least 65 years of age were enrolled in the study. Seventy-six residents (83 +...

AIM To determine overall cardiac effects of flavonoid catechin on ischemia-reperfusion injury in isolated rat hearts in vitro and in vivo. METHODS After perfusing hearts at the pressure of 70 mm Hg, coronary perfusion was interrupted for 30 minutes and then re-established. There were four experimental groups, with 10 rats each. The first group received 100 micromol/L of catechin added to the ...

Proanthocyanidins, also known as condensed tannins or oligomeric flavonoids, are found in many edible plants and exhibit interesting biological activities. Herein, we report a new, simple method for the stereoselective synthesis of procyanidin B6, a (+)-catechin-(4-6)-(+)-catechin dimer, by Lewis acid-catalyzed intramolecular condensation. The 5-O-t-butyldimethylsilyl (TBDMS) group of 5,7,3'4'-...

(+)-Catechin possesses a broad range of pharmacological properties, including antioxidative effect. However, little is reported on the mechanism by which (+)-catechin protects microglia cells from DNA damage by oxidative stress. In this study, TUNEL assay and DNA electrophorysis indicated that (+)-catechin markedly blocked DNA fragmentation and apoptosis of microglia cells by tBHP exposure. A p...

Due to their ubiquitous distribution, flavonoids from different classes are commonly present together in foods. However, little is known about the interactions between them. The flavonol quercetin and the flavan-3-ol (+)-catechin are among the most abundant flavonoids in the diet. In the present study, we have analysed the interactions between these two flavonoids on vascular function using two...

effects of catechin for preventing black spots forming in whiteleg shrimp (litopenaeus vannamei) were evaluated. for processing whole shrimp, catechin was used at a concentration of 0.2 and 0.3 % for 15 minutes. sodium metabisulfite was used at a concentration of 3 % for 10 minutes as control samples. without antioxidant shrimp were used as control samples too. treatments quality was evaluated ...