Soy Protein Isolate Powder for Formulation & Bulk Supply
Soy Protein Isolate (SPI) is a refined protein ingredient produced from defatted soybean flakes, in which most of the non-protein components - fiber, fat and carbohydrates - are removed during processing. It is supplied as a fine, free-flowing powder.
Protein content is typically ≥ 90% on a dry basis (N × 6.25). Soy Protein Isolate is used in plant-based food and meat-alternative formulations, sports nutrition and protein-fortified products, ready-to-drink and ready-to-mix beverages, and bakery and snack applications.
Xi'an Huilin Bio-tech Co., Ltd. supplies Soy Protein Isolate powder for plant-based food and meat-alternative manufacturers, sports nutrition and protein-powder brands (including OEM/ODM), beverage, bakery and snack producers, and food ingredient distributors and importers.
Compared with soy protein concentrate and defatted soy flour, Soy Protein Isolate is evaluated by its protein content and the basis on which it is reported, the functional metrics that matter in your formulation (emulsification, water and fat binding, gel formation), the test package issued with each batch, and the document set available for your target market.
Why Choose Huilin for Soy Protein Isolate Supply
- Specification Confirmed Before Order - the specification sheet for your target market is agreed upon before the first order, and the sample and the commercial batch are made to the same specification.
- Sample Before Bulk Order - samples can be requested for evaluation, and the COA of the batch the sample comes from is provided for review.
- Complete Batch Documentation - every batch is delivered with a COA that reports results together with test methods, plus TDS and MSDS.
- Customized Requirements - protein content, particle size, packing size, and market-specific documents are confirmed against your requirements.
- Export and Supply Experience - more than 15 years of export experience, with shipments arranged on FOB, CIF, EXW, or DDP terms from Shanghai, Ningbo, or Guangzhou.
COA
| Item | Specification | Result | Test Method |
|---|---|---|---|
| Appearance | Pale yellow or off-white free-flowing powder | Off-white powder | Visual |
| Odor | Characteristic soy odor, no rancid or foreign odor | Complies | Organoleptic |
| Protein (Dry Basis, N × 6.25) | ≥90.0% | 91.2% | GB 5009.5 |
| Moisture | ≤6.0% | 4.3% | GB 5009.3 |
| Ash | ≤6.0% | 4.1% | GB 5009.4 |
| Fat | ≤1.0% | 0.7% | GB 5009.6 |
| Crude Fiber | ≤1.0% | 0.6% | GB 5009.88 |
| pH (10% aqueous solution) | 6.8–7.5 | 7.1 | pH Meter |
| Nitrogen Solubility Index (NSI) | ≥85% | 88% | AOCS Ba 11-65 |
| Particle Size | 95% pass 100 mesh | Complies | Sieve analysis |
| Heavy Metals | |||
| Lead (Pb) | ≤0.5 mg/kg | 0.12 mg/kg | GB 5009.12 |
| Arsenic (As) | ≤0.3 mg/kg | 0.08 mg/kg | GB 5009.11 |
| Cadmium (Cd) | ≤0.1 mg/kg | <0.02 mg/kg | GB 5009.15 |
| Mercury (Hg) | ≤0.02 mg/kg | <0.01 mg/kg | GB 5009.17 |
| Microbiological | |||
| Total Aerobic Count | ≤10,000 CFU/g | 1,200 CFU/g | GB 4789.2 |
| Yeast & Mold | ≤100 CFU/g | 22 CFU/g | GB 4789.15 |
| Coliforms | ≤100 CFU/g | <10 CFU/g | GB 4789.3 |
| Salmonella | Negative /25g | Negative | GB 4789.4 |
| E. coli | Negative /g | Negative | GB 4789.38 |
| Aflatoxin B1 | ≤5 μg/kg | 1.1 μg/kg | GB 5009.22 |
The data above is for reference only. Please request the latest Certificate of Analysis (COA) for batch-specific data.
What Is Soy Protein Isolate?
Soy Protein Isolate is a high-purity plant protein ingredient made from soybeans. It is produced by removing most of the fats and carbohydrates from defatted soybean flakes, resulting in a protein content of over 90%. It is a complete protein that contains all nine essential amino acids required by the human body. Widely used in dietary supplements, protein powders, functional foods and meat substitutes, this fine powder features good water solubility and emulsifying properties, and it is a popular vegan protein source for sports nutrition and daily wellness formulations.
Soy Protein Concentrate vs Soy Protein Isolate: What Is the Difference?
| Soy Protein Concentrate (SPC) | Soy Protein Isolate (SPI) | |
|---|---|---|
| Raw Material | Defatted soybean flakes | Defatted soybean flakes |
| Processing | Non-protein components partially removed | Non-protein components removed by alkaline extraction and isoelectric precipitation, then spray dried |
| Protein Content (dry basis) | Typically 65–70% (market-typical range) | Typically ≥ 90% |
| Product Type | Protein concentrate ingredient | High-protein isolate ingredient |
| Typical Buyer | Bakery, snack, meat and beverage producers adding protein at a lower cost per unit | Plant-based, sports nutrition and beverage formulators needing high protein density and defined functional metrics |
| Qualification Focus | Protein content, flavour, cost per unit of protein | Protein content basis, functional metrics, contaminant package, non-GMO status |
Choose Soy Protein Concentrate when your formulation needs protein enrichment, a lower protein density is acceptable, and cost per unit of protein is the deciding factor → Please contact us.
Choose Soy Protein Isolate when you need high protein density, defined functional metrics (emulsification, water and fat binding, gel formation) and a documented test package for a plant-based, sports nutrition or beverage formulation → this page
Market-typical ranges are shown for comparison; confirm against the specification sheet of the grade you are evaluating.
What Should You Check When Buying Soy Protein Isolate?
| Check | What to Confirm |
|---|---|
| Protein content basis | Whether the value is reported on a dry basis or as-is, and which nitrogen factor is used (N × 6.25 for soy) |
| Particle size | The mesh size and the proportion passing the screen, and whether your process needs a specific distribution |
| Non-GMO status | Whether identity-preserved non-GMO material is required, and which declaration your market accepts |
| Functional metrics | Which metrics you will test at incoming inspection and the acceptance range you will apply |
| Contaminant, microbiology and allergen package | Which heavy metal, microbiological and residue items your market requires, and the soy allergen statement wording for your label |
| Documentation and batch reporting | The document list you need (COA, TDS, MSDS and market-specific documents), and how batch-to-batch variation is reported |
Soy Protein Isolate Sample Evaluation
Evaluate the material against your own formulation before committing to a commercial volume. The specification applied to the sample is the specification applied to the commercial batch.
Sample Request → Specification Confirmation → COA Review → Formula Test → Bulk Order
- Sample Request - state your application, the specification you need and your target market.
- Specification Confirmation - agree the specification sheet for your market before the sample is dispatched.
- COA Review - review the batch COA, including test methods, together with the sample you receive.
- Formula Test - run your own bench or pilot trial and confirm the metrics you will use at incoming inspection.
- Bulk Order - confirm packing, quantity and shipment terms; commercial batches are delivered with a COA.
Soy Protein Isolate Applications
- Plant-based meat and meat-alternative formulations: used as a protein source and for structure in emulsified and formed plant-based products.
- Sports nutrition and protein-fortified products: used to raise the protein content of powders, bars and fortified foods.
- Beverages, RTD and RTM: used in protein beverages and powdered beverage formulations where protein density and dispersion are specified.
- Bakery and snacks: used to increase protein content in baked and extruded products.
Final application performance depends on the formulation, processing conditions and target specification.
FAQs
Q: What is the difference between soy protein isolate and soy protein concentrate?
A: Soy Protein Isolate is more refined: the non-protein components are removed by alkaline extraction and isoelectric precipitation, giving a protein content of typically ≥ 90% on a dry basis, compared with a market-typical 65–70% for soy protein concentrate. The difference in degree of refinement is what drives the difference in protein density, flavour profile and functionality. Confirm both figures against the specification sheet of the grades you are comparing.
Q: What is the protein content, and on what basis is it reported?
A: Protein content is typically ≥ 90% on a dry basis, determined by Kjeldahl with a nitrogen factor of N × 6.25. The batch-specific result is stated on the COA. Make sure the basis used by your supplier matches the basis used at your incoming inspection - dry basis and as-is are not interchangeable.
Q: Can you send the specification sheet and COA?
A: Yes. Tell us the product and specification you need, and we will send you the specification sheet and the COA together with the related test reports. Documents for a specific market and product are confirmed before order.
Q: Is this product produced in your own factory?
A: Soy Protein Isolate is produced by our long-term partner production facility, managed under our own specification and quality standard. Every batch is delivered with a complete COA and test reports.
Q: Do you keep samples of each batch?
A: Yes. Please tell us the product, the specification and the destination market, and our team will confirm the retention arrangement for the batch you are evaluating.
Q: What is your MOQ?
A: Our MOQ is 1 kg for standard raw materials. For customized specifications and packing, the MOQ is confirmed with the specification.
Q: What is the shelf life and how should it be stored?
A: For our regular products the shelf life is 24 months, stored sealed in a cool and dry place. Special products may have a different shelf life - the exact shelf life and storage condition are confirmed on the specification sheet of the product you need.
Q: Which certificates can you provide for my customs clearance?
A: Our quality system and export documentation are supported by certificates held by our supplying entities, and their applicability depends on the product and the destination market. Tell us the product, the destination country and the document list your customs broker requires, and we will confirm which certificate we can issue - and in whose name - before you order. Every shipment is delivered with a COA and test reports.
Documentation, Packaging and Supply
- Documentation: COA with results and test methods per batch; TDS and MSDS; further documents - allergen statement, Non-GMO declaration where applicable, nutritional data and market-specific certificates - confirmed against your destination market and the document list your customs broker requires.
- Packaging: 1 kg aluminium foil bag in an outer express carton; 5 kg aluminium foil bag, splittable into 100 g / 300 g / 500 g; carton 6–20 kg with inner cushioning and waterproof outer treatment; fibre drum 25 kg and above; wooden barrel 25 kg with two inner transparent liners. Packaging can be adjusted to your requirement.
- MOQ: 1 kg for standard raw materials.
- Lead time: stock items are usually shipped within 5–7 days; large or customized orders are confirmed according to the customization content and the order quantity.
- Shipping: express, air or sea; FOB, CIF, EXW and DDP terms; shipped from Shanghai, Ningbo or Guangzhou; freight quoted separately according to the forwarder's standard.
- Shelf life and storage: 24 months for regular products, stored sealed in a cool and dry place.
- Sample arrangement: Samples are available for evaluation. For new customers, samples of low-unit-price stock products are provided free of charge, with the courier cost paid by the buyer. Sample arrangements are confirmed per request.
Soy Protein Isolate Supplier
Xi'an Huilin Bio-tech Co., Ltd. supplies Soy Protein Isolate powder for bulk orders, with specifications confirmed against your application and target market, samples for evaluation, batch COAs with test methods, and documentation support for your market. Send us your application, the specification you need, your target market and your target volume, and we will confirm availability, the specification sheet, the COA and the shipment arrangement.
For inquiries, quotations, or sample requests, please contact: sales@huilinbio-tech.com
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