Flagship Polyphenol & Bio-Nutrient Powder Extracts
Direct from our origin-backed extraction and processing facilities in Xi'an, Shaanxi. Fully documented with batch-specific HPLC/UV testing, pesticide-residue clearance to BS EN 15662 standards, and certified clean-label integrity.
Organic Roasted Hojicha Powder
Food-grade roasted green tea extract with high pyrazine aroma and natural polyphenolic tannins. Ultra-fine micro-milled for instant RTD beverages and confectionery.
Mulberry Leaf Sodium Copper Chlorophyllin 99%
Water-soluble semi-synthetic chlorophyllin derived from mulberry leaves. Exceptional heat/light stability for internal deodorants and clean-label green functional beverages.
Instant Black Tea Powder Bulk Extract
Rich in theaflavins and thearubigins through enzymatically controlled fermentation. 100% cold-water-soluble without sedimentation for industrial iced tea blending.
Pure Purple Yam (Ube) Bioactive Powder
Natural Dioscorea alata freeze-dried powder bursting with acylated anthocyanins. Imparts natural royal purple coloration and dietary fiber for nutraceutical formulations.
Blue Spirulina Phycocyanin Powder E25
Isolated phycobiliprotein antioxidant extracted through aqueous low-temperature fractionation. Pure, water-soluble natural blue pigment free of synthetic adulterants.
Organic Ceremonial Grade Matcha Powder
First-flush, shaded Camellia sinensis stone-milled to >1000 mesh. High concentration of L-theanine and EGCG catechins. USDA & EU Organic certified with full COA.
Natural Dioscorea Purple Yam Powder OEM
Spray-dried standardized purple yam powder optimized for stability against baking thermal cycles. Rich in natural polyphenols with customizable mesh dimensions.
Organic Phycocyanin (E3, E6, E18, E25, E40)
Versatile bioactive pigment grades spanning nutritional grade (E3) to ultra-concentrated diagnostic/supplement standards (E40). Fully halal and kosher certified.
Technical Specifications of Industrial Polyphenol Extracts
Polyphenols represent a heterogeneous class of plant-derived secondary metabolites characterized by multiple phenol structural units. B2B formulators must differentiate extraction solvents, marker compound standardization methods, and thermal stability profiles.
| Active Fraction / Compound | Primary Botanical Source | Standard Assay & Method | Core Chromatographic Marker | Primary B2B Functional Application |
|---|---|---|---|---|
| Epigallocatechin Gallate (EGCG) | Camellia sinensis (Green Tea) | 50% – 98% HPLC | (-)-Epigallocatechin-3-gallate | Thermogenic metabolic booster, cellular antioxidant |
| Theaflavins & Thearubigins | Fermented Black Tea Leaf | 20% – 40% HPLC | Theaflavin-3,3’-digallate | Cardiovascular support, lipid metabolism modulation |
| Acylated Anthocyanins | Dioscorea alata (Purple Yam) | 10% – 25% UV-Vis / HPLC | Cyanidin & Peonidin glucosides | Natural thermal-resistant food colorant, eye health |
| Chlorogenic Acids (CGA) | Green Coffee & Mulberry Leaf | 20% – 50% HPLC | 5-Caffeoylquinic acid | Glycemic balance, clean-label antioxidant preservation |
| Proanthocyanidins (OPC) | Grape Seed & Pine Bark | 95% UV-Vis / 70% HPLC | Oligomeric procyanidins | Vascular tone enhancement, anti-photoaging cosmetics |
| Phycobiliproteins (Phycocyanin) | Arthrospira platensis (Spirulina) | Color Value E18 – E40 | C-Phycocyanin subunit | Hepatoprotective agent, vibrant clean-label blue coloring |
High-Performance Chromatography
Xi'an Vexli Bio-Tech abandons obsolete UV absorption metrics for target polyphenols, utilizing reverse-phase HPLC with photodiode array detection (RP-HPLC-DAD) to quantify real monomeric concentrations, eliminating false readings from botanical adulterants.
- ISO 17025 calibrated HPLC instruments
- Retention-time validated marker peaks
Low-Thermal Vacuum Concentration
Polyphenols degrade rapidly under sustained thermal exposure. Our automated multi-stage falling-film evaporators concentrate extracts under deep vacuum at temperatures strictly maintained between 42°C and 55°C, preserving stereochemical bioactivity.
- Preservation of heat-sensitive catechins
- Minimal Maillard polymerization byproducts
Total Heavy Metal & Solvent Stripping
Utilizing high-surface-area food-grade macroporous adsorption resins and clean ethanolic fractionation, our processes systematically purge organic solvent residues down to <10 ppm and reduce Lead, Cadmium, Arsenic, and Mercury below EU and USP monograph limits.
- Pb < 1.0 ppm, As < 0.5 ppm, Cd < 0.1 ppm
- Zero residual Class 1 toxic solvents
Strategic Procurement Trends in Botanical Extracts
The global natural antioxidant landscape is undergoing seismic shifts driven by regulatory stringency, clean-label reformulations, and supply chain transparency demands. Discover where corporate procurement directors must pivot.
Clean-Label Synthetic Replacements
Global brands are aggressively phasing out synthetic antioxidants (BHA, BHT, TBHQ) in favor of high-polyphenol rosemary, mulberry, and green tea oleoresins to maintain shelf-life without artificial E-numbers on ingredient decks.
BS EN 15662 Pesticide Regimes
The European Commission and US FDA have intensified random testing for Pyrrolizidine Alkaloids (PAs) and Ethylene Oxide (EtO). Origin-direct traceability is now non-negotiable for enterprise compliance departments.
Supply Chain Regionalization
Western importers are shifting from spot brokers to auditable direct manufacturing partners in China with verified ESG footprints, stable domestic agricultural feedstock reserves, and verified trade logistics.
Cost-in-Use Formulation Audits
Sophisticated buyers now negotiate contracts based on cost per active bioactive kilogram (e.g., USD per pure gram of EGCG or unit of Phycocyanin E-value) rather than gross powder tonnage.
Technological & Extraction Development Trends
Xi'an Vexli Bio-Tech invests continuously in next-generation physical separation and stabilization technologies to bypass the limitations of classical chemical solvent extraction.
Pioneering Green Extraction & Molecular Stability
Traditional solid-liquid extraction methods often result in degradation of sensitive polyphenolic rings and leave trace solvent residues. Our R&D engineering facility has integrated Continuous Ultrasonic Counter-Current Extraction (UCCE), cutting extraction times by 75% while operating at ambient temperatures.
Furthermore, our proprietary Microencapsulation Spray-Drying leverages natural acacia gum and pea protein matrices to protect polyphenol extracts from gastric acidity, ensuring targeted enteric release and dramatically enhancing biological bioavailability in functional consumer products.
Proprietary Bioactive Protection Architecture
Why Fortune 500 Brands Trust Xi'an Vexli Bio-Tech
Located at the geographic gateway of the Qinling Mountains in Shaanxi Province—China's premier botanical corridor—Xi'an Vexli Bio-Tech Co., Ltd. has integrated botanical agronomy, continuous processing, and comprehensive analytical testing since 2014.
Rather than operating as a conventional trading entity, we manage an accredited network of 25 partner mills and operate in-house HPLC/GC/UV and microbial testing laboratories. We remove procurement vulnerabilities by taking direct ownership of specification design, international shipping compliance, and lot-to-lot bioequivalence.
ISO 22000
HACCP
USDA Organic
EU Organic
Halal
Kosher
Audited Enterprise Capabilities
Frequently Asked Questions by Sourcing Directors
Clear, unhedged answers to the technical, legal, and operational questions global ingredient buyers ask when onboarding Xi'an Vexli Bio-Tech.
Why does HPLC testing frequently report lower assay than UV-Vis testing?
UV-Vis spectrophotometry evaluates total absorption at a specific wavelength, measuring both the target polyphenol and related catechins, tannins, or oxidized degradation products. HPLC isolates individual molecular entities via column chromatography. For instance, a green tea extract claiming “98% Polyphenols by UV” may only deliver 50% EGCG when tested via validated RP-HPLC. We clearly indicate the testing methodology on every batch Certificate of Analysis.
What is your testing protocol for EU-restricted Ethylene Oxide (EtO) and PAs?
We mandate that all organic and conventional polyphenol extracts undergo zero-EtO treatment. Sterilization is executed via short-duration vacuum steam or irradiation upon explicit buyer request. We routinely contract SGS and Eurofins laboratories to execute multi-residue pesticide screenings conforming to BS EN 15662, assuring compliance with European Pharmacopoeia and EU Regulation 2020/1255.
How do you ensure color stability in anthocyanin and phycocyanin extracts?
Natural water-soluble colorants are prone to pH-dependent hypsochromic shifts and thermal fading. Our purple yam ube extracts utilize acylated anthocyanins that offer superior thermal stability up to 180°C in neutral-to-acidic bakery applications. For phycocyanin (E18–E40), we engineer cold-soluble formulations containing food-grade sodium citrate or trehalose buffers to stabilize the chromophore-protein complex.
Can you deliver customized mesh sizes for RTD beverage suspension?
Yes. Classical 80-mesh powder extracts tend to precipitate rapidly in RTD beverage formulations. Using cryogenic fluid-energy jet pulverizers, we produce ultra-fine particle distributions ranging from 300 to 1000 mesh (e.g., in ceremonial matcha and hojicha powders), enabling complete colloidal suspension, reduced mouthfeel astringency, and smooth dispersion without synthetic gums.
What are your standard trade terms, currencies, and delivery timeframes?
We support Incoterms 2020 including EXW, FOB Qingdao/Shanghai, CFR, CIF, and full DDP door-to-door delivery with customs cleared. Multi-currency transactions are accepted in USD, EUR, GBP, CAD, AUD, and CNY via T/T, L/C, or escrow. Standard air-express freight ships within 3 to 5 business days; multi-pallet containerized maritime freight departs within 12 to 14 days of PO issuance.
Do you maintain retained physical samples for long-term audit traceability?
Xi'an Vexli Bio-Tech enforces a strict 36-month sample retention archive for every single shipped lot under controlled RH (<45%) and temperature (<20°C) conditions. In the unlikely event of an internal formulator discrepancy or market recall, our QA team can re-assay the retained lot against baseline COA records within 24 hours.
Connect Directly with Our Botanical Chemists
Accelerate your formulation cycle. Submit your target active compound specification, desired mesh size, and destination regulatory requirements to receive a customized technical specification sheet, lot-specific COA, and competitive factory quotation within 12 hours.