Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Flavonoids quercetin, sources

Erlund, I. 2004. Review of the flavonoids quercetin, hesperetin, and naringenin Dietary sources, bioactivities, bioavailability, and epidemiology. Nutr. Res. 24 851-874. [Pg.406]

Fig. 2.57. Identification of a flavonoid diglycoside from unhydrolized chokeberry sample, (a) Positive total ion chromatogram, (b) ion source collision-induced dissociation chromatogram for the ion m/z 303 (quercetin), (c) full scan MS spectrum of the peak at 14.1min, (d) full scan MS-MS spectrum of the [M+H] ion, (e) fragmentation spectrum (MS3) of the m/z 303.3 ion. Reprinted with permission from S. Hakkinen et al. [161]. Fig. 2.57. Identification of a flavonoid diglycoside from unhydrolized chokeberry sample, (a) Positive total ion chromatogram, (b) ion source collision-induced dissociation chromatogram for the ion m/z 303 (quercetin), (c) full scan MS spectrum of the peak at 14.1min, (d) full scan MS-MS spectrum of the [M+H] ion, (e) fragmentation spectrum (MS3) of the m/z 303.3 ion. Reprinted with permission from S. Hakkinen et al. [161].
The flavonoid database described in this chapter was applied to 4-day weighed food records obtained from healthy Scottish men n = 41) and women ( = 52) to provide a provisional estimate of flavonoid intake in Scotland. All subjects consumed foods containing flavonols, procyanidins, and catechins, dietary intakes of which are given in Table 4.15. The main flavonol consumed was quercetin, accounting for 66 and 63% of the total flavonol intake of 18.8 mg/day. Primary sources of flavonols were from black tea (42.7%), onions (14.3%), apples (10.2%i), and lager (7.2%i) (Table 4.16). [Pg.244]

Species of the genus Vellozia have been extensively studied for their flavonoid complement in relation to chemosystematics. In addition to a series of C-methylflavonols and two C-prenylated flavonols, derivatives of vellokaempferol and velloquercetin are accumulated in whole plants, leaves, and leaf exudates. The basic structure of these compounds is characterized by 7,6-isopropenylfurano substitution, based upon kaempferol, quercetin, and their 0-methyl ethers. In addition, 8-C-methyl derivatives of these compounds were also identified from leaves of V. stipitata " So far, species of this genus are the only reported sources of these compounds, which in parts have been proved to be accumulated externally. ° Structures are exemplified by Figure 12.10. [Pg.711]

On average, the daily U.S. diet was estimated to contain approximately 1 g of mixed flavonoids expressed as glycosides. The flavonoid consumed most was quercetin, and the richest sources of flavonoids consumed in general were tea (48% of total), onions, and apples. [Pg.331]

Not all the dietary flavonoids are absorbed in the digestive tract. The absorption also depends on the flavonoid source for example, the quercetin from onions is better absorbed than that supplied by apples (Scalbert and WiUiamson, 2000). The nature of conjugates may influence the bioavailabihty of flavonoids, although both nonconjugated and conjugated aglycones may be absorbed in the intestine and enter the bloodstream (Hollman and Katan, 1999). [Pg.154]

The flavones and catechins seem to be the most powerful flavonoids for protecting the body against ROS. Epicatechin and rutin are also powerful free-radical scavengers. Xanthine oxidase enzyme is a source of oxygen-free radicals. The scavenging ability of rutin, quercetin, and silibin may be due to its inhibitory effect on xanthine oxidase activity, thereby resulting in decreased oxidative injury [60]. [Pg.240]

In the Zutphen Elderly Study (in Holland) carried out on 805 men aged 65-84 years, dietary intake of flavonoids was calculated during a five-year period. The study indicates that the intake of flavonoids is inversely associated with mortality from coronary heart disease and, to a lesser extent, myocardial infarct. The main source of flavonoids in the men s diets were tea, onions and apples. These flavonoids include quercetin, kaempferol and myricitin as well as the catechin-type condensed tannins found in black tea (Hertog et al. 1993). [Pg.35]


See other pages where Flavonoids quercetin, sources is mentioned: [Pg.290]    [Pg.566]    [Pg.378]    [Pg.415]    [Pg.274]    [Pg.31]    [Pg.35]    [Pg.66]    [Pg.262]    [Pg.83]    [Pg.450]    [Pg.127]    [Pg.241]    [Pg.246]    [Pg.416]    [Pg.451]    [Pg.568]    [Pg.622]    [Pg.1244]    [Pg.808]    [Pg.474]    [Pg.339]    [Pg.311]    [Pg.313]    [Pg.283]    [Pg.358]    [Pg.313]    [Pg.439]    [Pg.192]    [Pg.242]    [Pg.761]    [Pg.55]    [Pg.388]    [Pg.701]    [Pg.244]    [Pg.171]    [Pg.241]    [Pg.167]    [Pg.1568]    [Pg.1636]    [Pg.2094]    [Pg.2105]   
See also in sourсe #XX -- [ Pg.143 ]




SEARCH



Flavonoids quercetin

© 2024 chempedia.info