quercetin powder

At Shaanxi Rebecca Biotechnology Co., Ltd., we're more than just a manufacturer—we're your trusted partner in delivering natural health solutions. Our skilled R&D team continually optimises extraction techniques to reach the highest purity of bioactive substances.

Our Strengths:

Advanced Technology: We use high temperature drying and ultra-fine grinding technology to preserve the maximal nutrients and ensure the consistency of particles.

Production Capacity: Our contemporary facilities are geared for high volume orders and ensure rigorous batch-to-batch uniformity.

Excellence in Testing: We have complete range of HPLC, UV and other modern analytical tools to carry out exhaustive tests for purity, heavy metals and microbiological contamination.

International Certifications: ISO9001, ISO22000, FSSC22000, HACCP, HALAL, KOSHER, NOP, EOS, cGMP Certified—Ensure your goods comply with international standards.

Customisation Services: We provide OEM/ODM services on powder, tablets and capsules as per your brand needs.

Our effective logistics network and supply chain management guarantee your goods reach safely and on time anywhere in the globe.

Raw Material Selection:

We use only unopened, juicy buds of the Sophora japonica flower. Each batch is heavily screened by hand and machine to remove branches, leaves, dirt, bug damage, mould and oxidised materials. Strict rejection of raw materials older than one year, to avoid flavonoid deterioration.

Grade Type:

1. Regular Grade: Standard flower buds for 95% purity manufacture. Suitable for cost efficient formulations.

2. Refined Grade: Premium freshly picked buds pre-screened for pesticides and heavy metals, committed to 98% and 99% high purity criteria.

3. Organic Grade: From certified organic bases with USDA and EU organic paperwork. Produced in separate manufacturing facilities to avoid cross-contamination.

Each batch comes with full traceability paperwork, so you and your customers can trust the product’s origin and quality.

Solubility Profile:

Standard Quercetin: Slightly soluble in hot water and in ethanol; practically insoluble in cold water. Suitable for both capsules and tablets.

Water Soluble Modified: This β-cyclodextrin encapsulated quercetin powder is a water soluble modified form, which quickly dissolves in hot or cold water to form clear solutions for use in beverages, oral liquids and functional drinks.

Stability Factors:

Temperature: Processing temperatures should not exceed 60°C. Oxidation and yellowing occurs after prolonged exposure over 80°C.

pH Range: Most stable between 4.5-7.5. Strong acids or alkalis disrupt the structure of flavonoids.

Light Sensitivity: The dry powder is stable in light-proof, sealed packages. Water solutions have must be protected from light to avoid oxidation.

Moisture: Higher purity grades have lower hygroscopicity. Vacuum packed in aluminium foil, shelf life 24 months unopened.

Step 1: Raw Material Pretreatment

Selected flower buds are double screened and dried at the low temperature of 40-45°C. Then materials are pulverised to 20-30 mesh for maximum extraction efficiency.

Step 2: Extraction with water

The raw material is fed into extraction tanks and cleaned water is added. The two-stage high temperature extraction dissolves all flavonoids including rutin The plate and frame filtration removes the solids from the condensed mother liquid.

Step 3:  Acid-Base Hydrolysis Conversion

This crucial process transforms rutin into crude quercetin by the exact regulation of pH and temperature. With fine tuning of the parameters one may get full conversion with little contaminants.

Step 4: Crystallisation & Precipitation

The mixture is cooled after hydrolysis and crude quercetin crystallises out. Several layers of filtering to remove polysaccharides, colloids and colours.

Step 5: Recrystallisation Ethanol

The crude quercetin was dissolved in hot ethanol, decoloured with activated charcoal and crystallised at lower temperatures. Purity level depends on number of crystallisation cycles. Purity level after one crystallisation cycle is 95%; purity level after two crystallisation cycles with resin adsorption is 98%; purity level after many gradient crystallisation and chromatographic purification is 99%.

Step 6: Washing & Vacuum Drying

Crystallized product receives multiple washes with purified water and dilute ethanol. Low-temperature vacuum drying under complete light protection prevents oxidation.

Step 7: Water-Soluble Modification (Optional)

High-speed homogenisation and inclusion reaction are used to complex high-purity quercetin with β-cyclodextrin and then spray drying is done on it to form a cold-water-soluble powder.

Step 8: Crushing & Screening

Dried product is milled to customer required particle sizes (80-100 mesh or 200 mesh) and blended well for batch consistency.

Step 9: Pack & Quality Control

Products are packed in light-proof vacuum aluminium foil bags and covered by 25kg cardboard drums. Every batch is tested completely before warehousing and shipping.

Health Benefits:

· Powerful Antioxidant: Neutralizes free radicals and reduces oxidative stress

· Anti-Inflammatory Support: Helps maintain healthy inflammatory response

· Respiratory Health: Supports expectorant and antitussive functions

· Immune System Support: Contributes to overall immune function

· Cardiovascular Wellness: May support heart health and healthy circulation

Industry Applications:

· Dietary supplements (capsules, tablets, powders)

· Functional beverages and sports nutrition

· Pharmaceutical intermediates

· Cosmetic formulations

· Research and development

Our quercetin powder offers versatility across multiple product formats, allowing you to create innovative formulations that meet diverse consumer needs.

Quality is not only a promise, it is our basis. Each batch undergoes a comprehensive multi-point inspection:

· Quality Certification Systems: ISO9001, ISO22000, FSSC22000, HACCP for systematic quality management

· In-House Testing: HPLC, UV, heavy metal analysis, microbiological testing, pesticide residue screening

· Third Party Verification: Testing by labs verifies purity and safety

· Full traceability: Documentation from source of raw material up to the completed product

· Compliance requirements: All goods comply with EU EC396, EU 2023/915 and the toughest solvent residue requirements

We give COA and TDS with every shipment for your total transparency and trust.

Standard Packaging:

· Inner: Vacuum-sealed, light-proof aluminum foil bag

· Outer: 25kg food-grade cardboard drum

· Labeling: Complete product information, batch number, manufacturing and expiry dates

Customization Options:

· Flexible packaging sizes from 1kg to bulk quantities

· Private labeling available for OEM partners

· Custom particle size specifications

· Tailored formulation blends

Shipping Methods:

Our global logistics network supports air freight and ocean shipping. Products maintain stability during transit thanks to our professional packaging design. We work with reliable freight partners to ensure timely delivery worldwide.

Q: How do 95%, 98%, and 99% purity grades differ?

A: 95% employ single recrystallisation for cost-effective supplements. Double recrystallised, resin purified, 98% perfect for standard capsules and tablets. 99% needs repeated chromatographic purifications, and is best for premium formulations and research purposes.

Q: Do you have water soluble quercetin?

A: Yes. Our β-cyclodextrin encapsulated product is fast dissolving in cold water for drinks and liquid formulations and the standard powder is best suited for capsules and tablets.

Q: Can I put regular powder inside soft gel capsules?

A. Native quercetin should be dissolved in ethanol, propylene glycol and emulsifiers. Choose our water soluble encapsulated form for easier processing.

Q: What is the max processing temperature?

A: Store below 60°C. Oxidation and quality loss occurs at temperatures over 80°C. Stable pH range is 4.5 - 7.5.

Q. Will there be moisture issues with shipment by sea?

A: No. Our vacuum-sealed aluminium foil packaging prevents any moisture absorption and inhibits oxidation, providing a 24-month shelf life even after lengthy ocean travel.

Ready to enhance your product line with premium quercetin powder? Email us at information@sxrebecca.com to discuss your specific requirements.