Soy Protein Isolate

Soy protein isolate (SPI) is a highly refined soy ingredient made by removing most non-protein components from defatted soy, typically delivering around 88–92% protein per 100 g depending on grade. It offers strong solubility, emulsification, water binding, and gelation properties, with a neutral sensory profile in many applications. 

SPI is a go-to for products that need protein enrichment without excessive viscosity or chalkiness. It disperses well in dry blends and liquids, supports stable textures through heat and hold, and plays nicely with other proteins when you’re finetuning mouthfeel. 

Looking for a lower protein concentration? Blendtek also offers a range of soy flour and textured vegetable proteins.

Soy protein isolate shows up in more places than you might expect. Here’s how it fits into different categories: 

Sports Nutrition – Used in protein powders, blends, RTDs, puddings, and bars. SPI provides a complete amino acid profile, good mixability, and a smooth sip when instantized. It also helps bars maintain structure without becoming tough. 

Beverages – Added to smoothies, shakes, dairyalternative drinks, and nutrition beverages. Beveragegrade SPI disperses cleanly and supports a creamy mouthfeel with controlled viscosity, suitable for cold mix, HTST, or UHT processes. 

Meat – Used in patties, sausages, nuggets, and delistyle products to improve water binding, emulsification, and yield. It supports cohesive texture, even slicing, and better cooking performance. 

Dairy Alternatives – Helps build body and protein content in plantbased yogurts, frozen desserts, creamers, and cheesestyle products. SPI contributes creaminess and stability while keeping flavor systems in balance. 

Prepared Foods – Used in soups, sauces, fillings, and ready meals for protein fortification and texture consistency. It helps maintain viscosity and prevents separation through cookchill and reheat. 

Plant Based – A cornerstone in plantbased meats and hybrid systems. SPI teams well with pea, wheat, or fava proteins to dial in bite, juiciness, and structure. 

Organic – Available in certified organic formats for brands prioritizing clean sourcing and label claims.

• Protein level
  Beverage and nutrition grades typically 88–92% protein per 100 g. 

• Solubility and instantization
  Standard or instantized options. Instantized SPI improves coldmix dispersion and reduces clumping. 

• Functional focus
  Grades optimized for emulsification, waterbinding, gelling, or low viscosity—matched to RTDs, bars, or formed foods. 

• Flavor profile
  Neutral to lowbeany. Select lowflavor grades for delicate vanilla, cocoa, coffee, and fruit systems. 

• Process fit
  Align with pH, heat step (HTST/UHT/retort), shear, and hold time. SPI can be tuned for clarity versus creaminess based on your target beverage or food matrix. 

• Allergens
  Contains soy. We’ll align with your allergen program and labeling requirements. 

• Packaging
  Bags, totes, or custom pack sizes to fit your batching and storage needs. 

• Quantity
  We’ll review minimum order quantities and scale plans to match launch and forecast. 

• Certifications
  Blendtek is SQF certified, Kosher certified, and Organic certified. NonGMO and organic SPI options available. 

Soy protein isolate offers high protein with versatile functionality for sports nutrition, beverages, dairy alternatives, prepared foods, and plantbased concepts. Blendtek helps you choose the right grade or build a custom blend so your products pour smoothly, set cleanly, and taste the way you planned.