Overview
Quercetin is a naturally occurring flavonoid found in many fruits, vegetables, and grains, including apples, onions, and buckwheat. As a bioactive compound, it has attracted significant attention in the nutraceutical and pharmaceutical industries due to its potential health benefits. Chemically classified as a flavonol, quercetin is known for its distinctive yellow color and crystalline structure. It serves as a pigment in plants and plays a role in their defense mechanisms. The compound has been extensively studied for its antioxidant properties and potential therapeutic applications.
Physical and Chemical Properties
Quercetin appears as a yellow crystalline powder with a molecular weight of 302.24 g/mol. It decomposes at 316-317°C without boiling and has a density of 1.68 g/cm³. The compound is sparingly soluble in water but dissolves better in alcohol and alkaline solutions. As a polyphenolic compound, quercetin exhibits strong antioxidant activity due to its ability to scavenge free radicals. Its chemical structure includes multiple hydroxyl groups that contribute to its biological activity. The compound is relatively stable under normal storage conditions but may degrade when exposed to prolonged heat or light.
Main Applications
Quercetin finds extensive use in dietary supplements marketed for immune support and antioxidant benefits. Pharmaceutical applications include potential use in anti-inflammatory and cardiovascular formulations. The compound is also incorporated into functional foods and beverages for its health-promoting properties. In the cosmetic industry, quercetin is valued for its UV-absorbing capabilities and anti-aging effects. Some agricultural applications utilize quercetin as a natural preservative or growth enhancer. The versatility of this compound continues to drive research into new applications across multiple industries.
Safety and Storage
Quercetin is generally considered safe when consumed in typical dietary amounts. However, high doses may cause side effects such as headaches or digestive discomfort. The compound may interact with certain medications, including antibiotics and blood thinners. Proper storage requires protection from light, moisture, and excessive heat. Commercial quercetin should be kept in sealed containers at room temperature or below. Manufacturers often add stabilizers to enhance shelf life, with typical product stability ranging from 2-3 years when stored correctly.
B2B Procurement Guide
When sourcing quercetin for commercial use, prioritize suppliers who provide certificates of analysis (CoA) detailing purity levels and potential contaminants. The pharmaceutical and nutraceutical industries typically require ≥95% purity, while food-grade applications may accept lower concentrations. Bulk purchasing often results in significant cost savings, with prices typically decreasing for orders above 100 kg. Consider suppliers who offer customized formulations or blends with enhanced bioavailability. Quality control should include testing for heavy metals, residual solvents, and microbial contamination to meet regulatory standards.
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