2014-01-26

onion's Quercetin for #glutathione #antioxidants

25: news.health/antioxidants/onion's Quercetin for glutathione:
26: summary:
. another good reason to get more onions
is their connection to glutathione levels .

26: sources of Quercetin include onion:
mg of Quercetin in 100g of product:
233 Capers (Capparis spinosa)
170 Lovage, leaves
86 Dock, raw (Rumex spp.)
70 Radish leaves
68 chokeberry concentrate
66 Rocket, wild, raw (Diplotaxis tenuifolia)
62 acai berries
58 Carob fiber (Caromax)
50 Peppers, hot, yellow wax, raw
49 Fennel leaves,
39 Carob flour (Ceratonia siliqua)
32 red onion *---
30 Watercress, raw (Nasturtium officinale)
27 Peppers, ancho
26 corn poppy leaves, elder berries;
24 onion boiled *--
24 Hawthorn leaves,
22 Kale, raw (Brassica oleracea (Acephala Group) ),
22 Nalta jute,
21 Onions, raw (Allium cepa), *--
21 okra raw,
20 Bee Pollen
19 apple skins
18 Chia seeds, raw
17 sour cherry powder
8 white onion raw

Durk Pearson & Sandy Shaw 2005:
[ Nutr Cancer 2003 ] reported that
Quercetin could [raise] glutathione concentration
and the activity of the phase 2 enzyme
gamma-glutamylcysteine synthetase, 
the rate-limiting enzyme of glutathione synthesis. 
Durk Pearson & Sandy Shaw 2007:
[ Free Rad Biol Med 2002 ]reported that onion extract, quercetin, 
kaempferol, and apigenin increased the activity of
a transfected reporter gene for a
GCS (gamma-glutamylcysteine synthetase)
promoter subunit in a COS-1 cell culture study.
They found that, as an earlier study,
quercetin elevated the GSH level
and the expression of both the regulatory
and the catalytic subunit of GCS.
In addition, they found that quercetin
potently transactivates the GCSh promoter.