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| Product Name: |
Quercetin
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| Specifications |
95%,98% |
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| Minimum Order |
no limit |
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Standard extract effect and application:
Flavonoids, as a rule, are antioxidants, and a number of quercetin's effects appear to be due to its antioxidant activity. Quercetin scavenges oxygen radicals, inhibits xanthine oxidase, and inhibits lipid peroxidation in vitro.
As another indicator of its antioxidant effects, quercetin inhibits oxidation of LDL cholesterol in vitro, probably by inhibiting LDL oxidation itself, by protecting vitamin E in LDL from being oxidized or by regenerating oxidized vitamin E. By itself, and paired with ascorbic acid, quercetin reduced the incidence of oxidative damage to neurovasculature structures in skin, and inhibited damage to neurons caused by experimental glutathione depletion.
Quercetin's anti-inflammatory activity appears to be due to its antioxidant and inhibitory effects on inflammation-producing enzymes (cyclooxygenase, lipoxygenase) and the subsequent inhibition of inflammatory mediators, including leukotrienes and prostaglandins. Inhibition of histamine release by mast cells and basophils also contributes to quercetin's anti-inflammatory activity. Aldose reductase, the enzyme which catalyzes the conversion of glucose to sorbitol, is especially important in the eye, and plays a part in the formation of diabetic cataracts. Quercetin is a strong inhibitor of human lens aldose reductase. Quercetin exerts antiviral activity against reverse transcriptase of HIV and other retroviruses, and was shown to reduce the infectivity and cellular replication of Herpes simplex virus type 1, polio-virus type 1, parainfluenza virus type 3, and respiratory syncytial virus (RSV).
Allergies:
Quercetin's mast-cell-stabilizing effects make it an obvious choice for use in preventing histamine release in allergy cases, similar to the synthetic flavonoid analogue cromolyn sodium. Absorption of the pure aglycone quercetin is poor (see below); however, much of quercetin's anti-allergy effects may be due to anti-inflammatory and anti-histaminic effects in the gut.
Cardiovascular Disea |
| Company: |
Shaanxi KingSci Biotechnology Co., Ltd.
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| Contact: |
Ms. Miss Calida Wang |
| Address: |
C-1702,Haosheng Garden,No.138-2 Weiyang Rd. Xi`an China 710021 |
| Postcode: |
710021 |
| Tel: |
0086-29-82058335-11 |
| Fax: |
0086-29-86537617 |
| E-mail: |
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