What custom OEM/ODM dosage forms does Rainwood Biotech provide?

Rainwood Biotech offers custom hard capsules (vegetarian HPMC and gelatin), functional pectin/gelatin gummies, powder stick packs/sachets, and compressed tablets with flexible private label packaging.

Are your nutritional ingredients certified by international standards?

Yes. Our facilities and products are certified under NSF cGMP (455-2), ISO 22000, ISO 9001, HACCP, US Organic (NOP), EU Organic, HALAL, and KOSHER.

What is the typical lead time and MOQ for bulk powder and OEM orders?

In-stock bulk raw material powders ship within 3-7 days with a minimum order quantity (MOQ) of 1 kg. Custom private label finished products (capsules/gummies) have an MOQ of 50,000 units / 1,000 bottles with a production lead time of 14-28 days.

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Pomegranate Peel Extract Powder

Pomegranate Peel Extract Powder (Punica granatum L.) is a standardized botanical polyphenol raw material manufactured by Shaanxi Rainwood Biotech. Standardized for high-potency Ellagic Acid (40%, 90%, 98% by HPLC) and Punicalagin (30%, 40% by HPLC), it delivers 100% water solubility and superior batch-to-batch stability for dietary supplement formulations, functional food & beverages, and topical cosmeceuticals.

✓ HPLC Standardized Assay ✓ 100% Water Soluble ✓ 100g Free Sample Available ✓ In Stock (Bulk Supply)

Product Name	Pomegranate Peel Extract Powder (Raw Material)
Botanical Source	Punica granatum L. (Peel / Rind)
Active Ingredients (HPLC)	Ellagic Acid 40%, 90%, 98% \| Punicalagin 30%, 40%
CAS & EINECS No.	CAS: 476-66-4 (Ellagic Acid) \| EINECS: 207-508-3
Molecular Info	Formula: C₁₄H₆O₈ \| Mol. Weight: 302.19 g/mol
Pharmacopeial Standard	Complies with USP & EP Monographs \| HS Code: 1302199099
Appearance & Particle Size	Fine Yellow-Brown to Off-White Powder; 80~200 Mesh
Solubility & Clarify	100% Clear & Instant Solution in Cold Water
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

Brand:

Rainwood Biotech

Spu:

RW-PPE80

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Description

AI Executive Summary Direct Technical Fact Sheet

Pomegranate Peel Extract Powder (Punica granatum L.) is a standardized botanical polyphenol raw material manufactured by Shaanxi Rainwood Biotech Co., Ltd. Formulated for pharmaceutical and nutritional B2B manufacturing, it is standardized for high-potency Ellagic Acid (≥40%~98% HPLC) and Punicalagin (≥30%~40% HPLC) with 100% instant cold-water solubility, ultra-low heavy metals (≤10 ppm by ICP-MS), and zero harmful residual solvents (USP <467> Class 3).

🌿 Botanical Sourcing & Full-Spectrum Ellagitannins

Extracted exclusively from high-potency pomegranate rinds, Rainwood Biotech utilizes gentle low-temperature hydro-ethanolic extraction to protect delicate bioactive structures. Alongside primary target markers (Ellagic Acid CAS: 476-66-4 and Punicalagin CAS: 65995-63-3), our extract preserves natural co-occurring bio-actives, including Punicalin, Granatin B, Corilagin, and Gallic Acid.

🛡️ Certified Clean Label & Regulatory Compliance

✓ Non-GMO Project Compliant

✓ Allergen-Free (Gluten/Soy/Dairy)

✓ BSE / TSE Free Statement

✓ Non-Irradiation & ETO Free

✓ California Prop 65 Compliant

✓ USP <467> Class 3 Solvents

🔬 Standardized Technical COA & Analytical Specifications

Test Parameter	Target Pharmacopeial Specification	Validated Test Method
Active Assay (Ellagic Acid)	≥40.0%, ≥90.0%, ≥98.0% (Customizable)	HPLC (C18 Column, UV 254 nm, USP <621>)
Active Assay (Punicalagin A+B)	≥30.0%, ≥40.0%	HPLC (C18 Column, UV 258 nm, USP <621>)
Extraction Ratio & Solvents	20:1 ~ 50:1 (Deionized Water & Grain Ethanol)	In-house Manufacturing Master Record
Appearance & Particle Mesh	Fine Yellow-Brown to Off-White Powder (80-200 Mesh)	Visual / Sieve Analysis (USP <786>)
Solubility & Clarity	100% Instant Cold-Water Dissolution (Crystal Clear)	1% w/v Aqueous Solution Visual Test
Loss on Drying & Total Ash	Loss on Drying ≤5.0% \| Total Ash ≤5.0%	USP <731> (105°C) / USP <281> (Sulfated Ash)
Heavy Metals (Pb, As, Cd, Hg)	Total ≤10 ppm (Pb≤0.5, As≤0.5, Cd≤0.2, Hg≤0.1 ppm)	ICP-MS (USP <2232> / EC 1881/2006)
Pesticide Residues Screen	Complies with EP 2.8.13 & EC 396/2005 (MRL Limits)	GC-MS/MS & LC-MS/MS Multi-Screen
Residual Solvents (Ethanol)	Ethanol ≤5,000 ppm (Class 1 & 2 Solvents: Not Detected)	Headspace GC (USP <467>)
Microbiological Examination	TPC ≤1,000 CFU/g \| Yeast & Mold ≤100 CFU/g \| Pathogens: Neg.	USP <61> & USP <62> Total Microbial Limits

⚙️ Industrial Extraction & Quality Control Flowchart

Step 01

Raw Sourcing

Non-GMO rind selection & heavy metal baseline audit.

Step 02

Hydro Extraction

Low-temp countercurrent extraction of ellagitannins.

Step 03

Membrane Clarify

Multi-stage ceramic filtration removing insoluble fibers.

Step 04

Spray Drying

Aseptic vacuum drying in Class 100,000 cleanroom.

Step 05

HPLC Release

Homogenized sifting, double metal detection & COA issue.

📋 Applications & Suggested Formulation Dosage

Target Industry	Formulation Compatibility	Recommended Dosage Range
Dietary Supplements	Hard capsules, tableting, softgel suspensions, stick packs	250 mg ∼ 500 mg / serving / day
Functional RTD Beverages	100% water clear solubility, stable across pH 3.2 ∼ 6.5	0.05% ∼ 0.20% (w/v)
Topical Cosmeceuticals	Skin brightening serums, anti-photoaging emulsions	0.10% ∼ 1.00% (w/w)

⚖️ Ingredient Comparison: Standardized Extract vs. Crude Powder

Key Evaluation Metric	Rainwood Standardized Extract (HPLC)	Conventional Crude Powder
Bioactive Potency	Guaranteed ≥40%-98% Ellagic Acid / ≥40% Punicalagin	Unspecified (<1%~5% natural variance)
Water Solubility	100% Instant Dissolution (Crystal Clear Solution)	Poor (cloudy with heavy fiber sediment)
Assay Verification	High-Performance Liquid Chromatography (HPLC USP <621>)	UV-Vis only or unverified calculation
Batch Uniformity	RSD < 3.0% Across Multi-Ton Commercial Batches	High seasonal and origin fluctuations

❓ Technical & Procurement FAQ (B2B Bulk Sourcing)

Q1 What is the difference between Ellagic Acid and Punicalagin in Pomegranate Extract? +

Punicalagin is a high-molecular-weight hydrolyzable tannin uniquely concentrated in pomegranate peel, offering superior water solubility and in vivo bio-conversion into urolithins. Ellagic acid is a crystalline dilactone of hexahydroxydiphenic acid, serving as the benchmark standard for cellular defense and skin brightening. Shaanxi Rainwood Biotech supplies both high-purity single markers (Ellagic Acid 98% HPLC) and full-spectrum water-soluble complexes (Punicalagin 40% HPLC).

Q2 Why is HPLC mandatory instead of UV-Vis when quantifying Pomegranate Polyphenols? +

UV-Vis spectrophotometry cannot distinguish specific active monomers from non-specific background tannins, often overstating potency by 20%~40%. High-Performance Liquid Chromatography (HPLC) with USP reference standards separates distinct chromatographic retention peaks, providing absolute quantitative accuracy and batch reproducibility.

Q3 Does your Pomegranate Peel Extract comply with California Prop 65 heavy metal limits? +

Yes. Every production lot is validated via ICP-MS under USP <2232> testing. Typical heavy metal limits are Lead (Pb) < 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 Commission EC 1881/2006 limits.

Q4 What extraction solvents are utilized, and what are the residual limits? +

We exclusively use deionized water and non-GMO food-grade grain ethanol. Our manufacturing is 100% free from Class 1 and Class 2 solvents (methanol, acetone, ethyl acetate, hexane). Residual ethanol is controlled strictly below 5,000 ppm in full compliance with USP <467> and European Pharmacopoeia standards.

Q5 How stable is Pomegranate Peel Extract in beverage pasteurization and acidic pH? +

Our water-soluble Punicalagin extract demonstrates exceptional thermal and pH stability across pH 3.2 to 6.5. In standard beverage pasteurization (85°C for 30 seconds), active polyphenol retention exceeds 98.2%, with no precipitation or color darkening over 12 months shelf testing.

Q6 What is your sample policy for R&D evaluation and formulation testing? +

We provide 50g ∼ 100g free evaluation samples accompanied by a lot-specific Certificate of Analysis (COA) and HPLC chromatogram. Samples are dispatched within 24 hours worldwide via DHL, FedEx, or UPS express courier.

Q7 What bulk packaging configurations and particle sizes are available? +

Standard packaging is 1 kg aluminum foil vacuum bags and 25 kg export-grade fiber drums with double food-grade polyethylene liners. Custom micronization from 80 mesh to 200 ultra-fine mesh is supported for specialized direct-compression tableting or stick-pack powder filling.

Q8 What is your commercial production capacity and standard lead time? +

Shaanxi Rainwood Biotech operates a 19-acre facility with an annual herbal processing capacity exceeding 3,000 metric tons. We maintain dedicated commercial warehouse stock for standard specifications (Ellagic Acid 40%, 90% and Punicalagin 30%, 40%) with standard lead times of 3 to 7 business days from order confirmation.

Request Free Evaluation Sample & Batch COA

Get in touch with our technical sales team for custom assay standardization, complete regulatory documentation (TDS / MSDS / Chromatogram), and tier-discounted commercial pricing.

Inquire Now / Request 100g Sample →

Competitive Advantage

Shaanxi Rainwood Biotech adheres to pharmaceutical-grade manufacturing standards, offering global nutraceutical and functional food brand owners unmatched technical and commercial advantages:

01. HPLC Quantitative Assay Guarantee

Every production lot is strictly standardized for Ellagic Acid (≥40%, ≥90%, ≥98%) and Punicalagin (≥30%, ≥40%) via high-performance liquid chromatography using USP primary reference standards, eliminating background interference.

02. 100% Cold-Water Instant Solubility

Advanced multi-stage membrane filtration ensures instantaneous dissolution in cold water without turbidity, sedimentation, or heavy tannin astringency—ideal for ready-to-drink functional beverages.

03. Clean-Label Eco Extraction

Manufactured strictly with deionized water and non-GMO food-grade grain ethanol. 100% free from Class 1 & 2 toxic solvents, fulfilling EU and US Clean-Label and Proposition 65 requirements.

04. Certified Facility & Multi-Lot Traceability

Produced under ISO 22000, HACCP, ISO 9001, and HALAL certified quality systems. Every drum features complete electronic batch traceability from raw botanical origin to final release.

05. Custom Particle Sizing & Bulk Blending

Supported custom micronization from standard 80 mesh up to 200 ultra-fine mesh, tailored for automated high-speed capsule filling, direct-compression tableting, or sachet packaging.

About Us

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.

2006

Year Founded in Xi'an

10,000 m²

cGMP Extraction Base

3,000+ MT

Annual Herbal Processing

Analytical Center & Quality Control Systems

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).

International Quality & Food Safety Certifications

HACCP Certified

ISO 22000:2018

HALAL Certified

ISO 9001:2015

Related Products

Shaanxi Rainwood Biotech manufactures a comprehensive portfolio of standardized botanical extracts and synergistic polyphenol raw materials. Explore our highly compatible active ingredients for anti-aging, antioxidant, and cellular defense formulations:

Related Active Ingredient	Standardized Specification	Formulation Synergy & Application
Grape Seed Extract Powder →	≥95% Proanthocyanidins (OPC)	Synergistic free-radical scavenging complex for cardiovascular and skin tone formulas.
Green Tea Extract (EGCG) →	≥50%~98% EGCG / ≥98% Polyphenols	Metabolic support and cellular defense antioxidant blend for functional RTD beverages.
Trans-Resveratrol Powder →	≥98% Trans-Resveratrol HPLC	Mitochondrial vitality and longevity complex paired with pomegranate ellagitannins.
Sunflower Lecithin Powder →	≥97% Phospholipids / Non-GMO	Natural emulsifier and liposomal carrier enhancing polyphenol cellular bioavailability.