Grape Seed Extract Powder (Vitis vinifera L.) is a standardized botanical polyphenol raw material manufactured by Shaanxi Rainwood Biotech. Standardized for high-potency Proanthocyanidins (OPC ≥95.0% by UV-Vis) and Total Polyphenols (≥95.0%), it delivers 100% instant cold-water solubility, crystal-clear reddish solution, and superior batch-to-batch stability for dietary supplement formulations, cardiovascular support capsules, functional beverages, and topical cosmeceuticals.
| Product Name | Grape Seed Extract Powder (Raw Material) |
| Botanical Source | Vitis vinifera L. (Seed) |
| Active Ingredients (Assay) | Proanthocyanidins (OPC) ≥95.0% | Polyphenols ≥95.0% |
| CAS & EINECS No. | CAS: 84929-27-1 / 4852-22-6 | EINECS: 284-511-6 |
| Molecular Info | Formula: (C30H26O12)n | Dimer MW: 578.52 g/mol |
| Pharmacopeial Standard | Complies with USP & EP Monographs | HS Code: 1302199099 |
| Appearance & Particle Size | Fine Red-Brown to Purple-Brown Powder; 80~100 Mesh |
| Solubility & Clarity | 100% Instant Clear Solution in Cold Water (Zero Sediment) |
| Packaging & Storage | 1 kg/Foil Bag; 25 kg/Fiber Drum; 24 Months Shelf Life |
| Sample & Lead Time | 100g Free Sample (Dispatched in 24h); Bulk: 3-7 Days |
Grape Seed Extract Powder (Vitis vinifera L.) is a standardized botanical polyphenol raw material manufactured by Shaanxi Rainwood Biotech Co., Ltd. Formulated for pharmaceutical, nutraceutical, and cosmetic B2B manufacturing, it is standardized for high-potency Oligomeric Proanthocyanidins (OPC ≥95.0% UV-Vis) and Total Polyphenols (≥95.0%) with 100% instant cold-water solubility, ultra-low heavy metals (≤10 ppm by ICP-MS), and zero harmful residual solvents (USP <467> Class 3).
Extracted exclusively from premium non-GMO red grape seeds (Vitis vinifera L.), Rainwood Biotech utilizes gentle low-temperature hydro-ethanolic countercurrent extraction to preserve low-molecular-weight oligomeric structures. Alongside primary target markers (Oligomeric Proanthocyanidins / OPCs CAS: 84929-27-1), our extract preserves natural synergistic bioflavonoids, including Catechin, Epicatechin, Epicatechin Gallate, and Gallic Acid, delivering exceptional bioavailability and broad-spectrum cellular antioxidant protection.
UV-Vis spectrophotometry (Porter's n-Butanol-HCl assay or Folin-Ciocalteu method) measures total oligomeric and polymeric proanthocyanidin bonds, which is the official global pharmacopeial assay standard (USP / EP) specifying ≥95.0% OPC. HPLC testing separates monomeric Catechin and Epicatechin. Shaanxi Rainwood Biotech provides dual-method verification on every commercial Certificate of Analysis (COA).
Yes. Our specialized microfiltration and molecular-weight fractionation process yields a 100% cold-water-soluble fine powder. It dissolves instantly in room-temperature water to form a brilliant, clear reddish-purple solution with zero insoluble sediment, making it ideal for ready-to-drink (RTD) beverages, effervescent tablets, and cosmetic serums.
Yes. Every production batch is rigorously tested via ICP-MS under USP <2232> guidelines. Lead (Pb) is controlled below 0.5 ppm, Arsenic (As) < 0.5 ppm, Cadmium (Cd) < 0.2 ppm, and Mercury (Hg) < 0.1 ppm, fully compliant with strict California Proposition 65 and European Union EC 1881/2006 dietary supplement standards.
Our extraction utilizes only deionized water and non-GMO food-grade grain ethanol. Our manufacturing facility is 100% free from Class 1 and Class 2 toxic solvents (methanol, acetone, ethyl acetate, benzene). Residual ethanol is controlled strictly below 5,000 ppm in full compliance with USP <467> and EP limits.
Grape Seed Extract is widely formulated alongside Vitamin C, Vitamin E, Trans-Resveratrol, Pine Bark Extract, Pomegranate Peel Extract (Ellagic Acid), and Green Tea Extract (EGCG) to provide synergistic antioxidant network recycling, collagen synthesis support, and vascular endothelial protection.
We provide 50g ∼ 100g free evaluation samples accompanied by a lot-specific Certificate of Analysis (COA) and UV-Vis spectrophotometric spectrum. Samples are dispatched within 24 hours worldwide via DHL, FedEx, or UPS express courier.
Standard commercial packaging is 1 kg aluminum foil vacuum bags and 25 kg export-grade fiber drums with double food-grade polyethylene inner liners. Custom particle sizing from 80 mesh to 120 fine mesh is available to optimize capsule filling flowability and tablet compressibility.
Shaanxi Rainwood Biotech maintains dedicated commercial warehouse stock for Grape Seed Extract (OPC ≥95.0%) with a monthly supply capacity of 50+ Metric Tons. Standard lead times are 3 to 7 business days from purchase order confirmation.
Get in touch with our technical sales team for custom assay standardization, complete regulatory documentation (TDS / MSDS / Spectrum), and tier-discounted commercial pricing.
Inquire Now / Request 100g Sample →Shaanxi Rainwood Biotech adheres to pharmaceutical-grade manufacturing standards, offering global nutraceutical, functional beverage, and cosmeceutical brand owners unmatched technical and commercial advantages:
Shaanxi Rainwood Biotech Co., Ltd. (established in 2006) is a premier cGMP-compliant botanical extract manufacturer and standardized raw material supplier headquartered in the High-Tech Industrial Development Zone of Xi'an, China.
Operating across a 19-acre dedicated extraction manufacturing base with over 10,000 m² of modern production facilities and Class 100,000 cleanrooms, Rainwood Biotech bridges traditional herbal wisdom with state-of-the-art analytical chemistry to supply high-purity functional ingredients worldwide.
Our in-house analytical testing center is fully equipped with Shimadzu High-Performance Liquid Chromatographs (HPLC), Gas Chromatographs (GC), UV-Vis Spectrophotometers, Thin-Layer Chromatography (TLC), and Atomic Absorption Spectrometers (AAS). We maintain routine verification partnerships with globally accredited third-party testing laboratories (SGS, Eurofins, and PONY Testing).
Shaanxi Rainwood Biotech manufactures a comprehensive portfolio of standardized botanical extracts and synergistic antioxidant polyphenols. Explore our highly compatible active ingredients for cardiovascular, skin elasticity, and cellular longevity formulations:
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