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  • 5%-98%

  • Light Yellow Powder

  • BH


  • 1KG

  • ISO/USDA Organic/EU Organic

  • Food Grade

  • 2 Years

  • Drum, Aluminum Foil Bag

  • Available

  • China

  • 5000 Kilograms/ Per Month


What's quercetin?

Quercetin, also known as quercetin, quercetin, is soluble in glacial acetic acid, the alkaline solution is yellow, almost insoluble in water, and bitter in alcohol solution. It has a good expectorant, antitussive effect, and has a certain antiasthmatic effect.

Basic Information

Chemical formula: C15H10O7

Molecular weight: 302.236

CAS Number: 117-39-5

Physical and chemical properties

Density: 1.799g/cm3

Melting point: 314-317℃

Boiling point: 642.4℃

Flash point: 248.1℃

Refractive index: 1.823

Appearance: Yellow needle-like crystalline powder

Solubility: slightly soluble in water, easily soluble in alkaline aqueous solution

How to use it?

1. Quercetin powder is mainly used in oils, beverages, cold drinks and meat products.

2. Healthcare supplement.

COA of Sophora Japonica Quercetin

Test DescriptionStandardResultsMethods
AppearanceYellow powderConformsVisual method
OdorNone to slightConformsSmell
Particle size100%Through 80 meshConformsCP2020
Heavy metals≤l0ppm< 10ppmColorimetry
AS≤1ppm< 1ppmAAS
Pb≤1ppm< 1ppmAAS
Cd≤1ppm< 1ppmAAS
Reducing sugarNegativeNegativeGS
Sulphated ashes≤0.2%0.05%CP2020
Assay(on dry product)≥98.0%99.90%UV method
≥95.0%95.40%HPLC method

-- Bacteria≤1000cfu/g< 10cfu/g
-- Yeast & Mould≤l00cfu/g< 10cfu/gCP2020
-- SalmonellaNegativeNegative
-- Escherichia coliNegativeNegative
-- Staphylococcus aureusNegativeNegative
This product is tested according to in-house standard and the results meet the specifications.


1. Natural extraction and separation

Since the content of quercetin in plants is only a few thousandths to a few thousandths, and the extraction and separation is difficult and the cost is high, it is not practical to extract quercetin directly from plants. However, when analyzing, identifying flavonoids or preparing analytically pure samples, quercetin extraction and separation techniques are used.

2. Acid hydrolysis method

The rutin (rutin) of quercetin is widely distributed in nature and has a high content. For example, the content in sophora japonica is as high as 20%. Rutin is first extracted from Sophora japonica, and then acid hydrolyzed to generate quercetin. This method is feasible in production.

The extraction methods of rutin mainly include alkali extraction and acid precipitation, organic solvent extraction and dipping, among which alkali extraction and acid precipitation is the most practical. Select 0.05% NaOH solution to boil for 20min, filter while hot, extract 4 times with the same method to obtain an alkaline aqueous solution of rutin, add acid to make it precipitate, add acid after filtration to make it hydrolyzed to obtain water-insoluble quercetin, filter , washed with water, and dried to obtain quercetin solid.

3. Enzymatic conversion method

Enzymatic hydrolysis of rutin is used to prepare a large amount of quercetin monomers with less content in plants. The operation is simple and safe, the whole process is economical and applicable, the yield is large, suitable for industrial production, and the product purity is more than 90%, which can meet the needs of food and clinical applications . Therefore, enzymatic transformation is undoubtedly a very promising preparation method.