Quercetin

同義語： Quercetin, 3,3′,4′,5,7-Pentahydroxyflavone, Sophoretin, Meletin, Quercetin anhydrous, Quercetin dihydrate

Quercetin belongs to the flavonol subclass of flavonoids, characterized by a 15-carbon skeleton (C6-C3-C6) with two aromatic rings linked via a three-carbon bridge. Its five hydroxyl groups at positions 3, 5, 7, 3′, and 4′ underpin its potent antioxidant capacity, enabling electron donation to neutralize free radicals and chelate transition metal ions. The catechol moiety in the B-ring and the 3-hydroxy group in the C-ring are critical for its radical-scavenging activity and modulation of multiple signaling pathways.

As a naturally occurring polyphenol, quercetin is widely distributed in fruits, vegetables, and grains, with notable concentrations in onions, apples, berries, and tea. For commercial use, it is typically extracted from Sophora japonica (Japanese pagoda tree) buds or produced via semi-synthesis, then purified to high assay grades. The material is available in both anhydrous and dihydrate forms; the dihydrate is more stable under ambient conditions and is the preferred grade for solid dosage forms.

In the B2B ingredient market, quercetin serves as a versatile bioactive for dietary supplements, functional foods, and pharmaceutical research. Its well-documented mechanisms—ranging from Nrf2 activation to inhibition of histamine release and modulation of inflammatory cytokines—make it a staple in products targeting immune support, cardiovascular health, and healthy aging. Formulators value its compatibility with other flavonoids and its established safety profile.

化学構造と性質

Quercetin is a pentahydroxyflavone with a molecular formula of C15H10O7 and a molecular weight of 302.24 g/mol. It appears as a yellow to yellow-green crystalline powder, practically insoluble in water but soluble in polar organic solvents such as ethanol, methanol, and acetone. The compound exhibits strong UV absorption, which is utilized in analytical quantification. Its melting point is approximately 316°C (decomposition), and it is sensitive to light and oxidizing agents, necessitating storage in tightly sealed containers away from direct light.

作用機序

• Antioxidant activity: Scavenges reactive oxygen species (ROS) and reactive nitrogen species (RNS), upregulates endogenous antioxidant enzymes via the Nrf2/ARE pathway, and chelates pro-oxidant metals like iron and copper.
• Anti-inflammatory effects: Inhibits NF-κB and MAPK signaling cascades, reducing the expression of COX-2, iNOS, and pro-inflammatory cytokines such as TNF-α and IL-6.
• Antihistamine and mast cell stabilization: Suppresses histamine release from mast cells and basophils, making it useful in allergy-related formulations.
• Cardiovascular support: Improves endothelial function by enhancing nitric oxide bioavailability and inhibiting LDL oxidation, contributing to vascular health.
• Senolytic and anti-aging potential: Selectively induces apoptosis in senescent cells and modulates sirtuin and mTOR pathways, a focus of ongoing longevity research.

品質仕様

供給および書類

• 容量: 50 metric tons per year
• リードタイム: 3～5営業日（在庫品）
• ドキュメント: COA, MSDS, TDS, and nutritional analysis available upon request
• パッケージ: 25 kg fiber drum with double PE inner liners; custom packaging options available

見積依頼

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