Publish Time: 2026-08-18 Origin: Site
In the previous article, we introduced what food-grade phosphates are. This time, we will focus on an in-depth analysis of food-grade phosphate products, introducing the application characteristics of different food-grade phosphate products.
Phosphates are one of the most common food additives in the modern food industry, and they can be found in many common foods, such as meat products, dairy products, baked goods, and beverages. Food-grade phosphates play several roles in food, including: acidity regulation, water retention, buffering, stabilization, chelation, leavening, anti-caking, improving texture, and nutritional fortification.
This article will focus on 12 common phosphates provided by Polifar and explain the differences between them.
Sodium hexametaphosphate, molecular formula (NaPO₃)₆, CAS 10124-56-8 , E number E452i , is a white powder or granules , readily soluble in water, with aqueous solutions ranging from weakly acidic to neutral .
SHMP is a long-chain polyphosphate whose main functions are moisture retention, leavening, acidity regulation, stabilization, coagulation, and anti-caking. Its mechanism of action involves its molecular structure's ability to complex with calcium and magnesium ions, thus stabilizing food systems. It can also interact with proteins and water. Therefore, it is commonly used in water for meat products, seafood, dairy beverages, and food processing .
（1）Meat Products
Sodium hexametaphosphate helps retain moisture in meat proteins, minimizing water loss during processing and maintaining the tenderness and elasticity of the meat. Common meat products include ham , sausages , luncheon meat , meatballs , minced meat products , and processed meat products.
（2）Aquatic Products
Food-grade SHMP effectively prevents protein denaturation, delays spoilage, and stabilizes the color and texture of aquatic products. It is commonly used in surimi, frozen fish, and shrimp products.
（3）Dairy Products and Beverages
The food additive sodium hexametaphosphate can stabilize the structure of milk proteins, reducing stratification and coagulation in dairy products. It can also prevent the precipitation of metal ions in beverages, thus preventing discoloration. Common examples include yogurt, cheese, ice cream, orange juice, coconut milk, and other fruit juices.
（4）Water Ttreatment for Food Processing
In some food processing systems, the addition of the food additive SHMP can chelate calcium and magnesium ions , helping to soften and stabilize the water system.
SHMP has strong compatibility, strong complexing ability, good water retention effect, and strong dispersion stability, making it suitable for food systems with comprehensive functions of "complexing + water retention + stabilization".
Tricalcium phosphate molecular formula Ca₃(PO₄)₂, CAS 7758-87-4, E number E341iii . It is a white, odorless, tasteless crystal or fine crystalline powder , insoluble in water, soluble in acid , and has good flowability.
TCP is a calcium salt type of orthophosphate. Its main functions are: moisture retention , leavening , acidity regulation , stabilization , coagulation , anti-caking, and nutritional fortification . It works by physically isolating moisture, preventing clumping and adhesion, and also supplying calcium and phosphorus to enhance nutrition. Therefore, it is commonly used in fortified foods , milk powder and powdered foods , and pH-adjusting and buffering foods.
（1）Fortified Foods
Food-grade triicalcium phosphate contains 34-40% calcium and approximately 18-20% phosphorus, with a calcium-to-phosphorus ratio of ≈1.5-2:1. It provides the body with calcium and phosphorus, and the calcium-to-phosphorus ratio is close to that of the inorganic phase in human bones, making it easily absorbed. It is commonly used in fortified foods, solid beverages, and dietary supplements for mineral fortification, preventing calcium and phosphorus deficiencies.
（2）Milk Powder and Powdered Foods
Food-grade TCP has excellent anti-caking properties. It effectively prevents solid particles such as flour, milk powder, and protein powder from clumping together, allowing all powders to remain in an independent state and maintain good flowability.
（3）Adjust pH
The food additive tricalcium phosphate can adjust pH levels and has a certain buffering effect. It is commonly used in foods such as candy, pudding, condiments, and meat.
Compared to sodium and potassium salts , E341iii's unique water insolubility and favorable calcium-to-phosphorus ratio enable it to exert excellent anti-caking properties in food, enhancing nutritional value and improving powder flowability.
Sodium tripolyphosphate, with the molecular formula Na₅P₃O₁₀ , CAS 7758-29-4, E designation E451i , is a white powder or granules that are readily soluble in water. Its aqueous solution is alkaline, with a pH of approximately 9.5 .
Food-grade STPP powder is a condensed phosphate whose primary functions are retaining moisture in food, buffering, emulsifying, stabilizing, and chelating. Its working principle is to chelate metal ions, preventing precipitation and discoloration. It also prevents crystallization and preserves texture. Therefore, it is commonly found in meat products, seafood, fruit juices, and baked goods.
（1）Meat Products
In ham, sausage, meatballs, chops, canned goods, and bacon. It is often used in combination with other phosphates, with an addition amount of 0.1%–0.3%. The products remain tender, juicy, and elastic after cooking.
（2）Seafood
In the preservation of fish and shrimp, the food additive STPP powder can lock in the moisture of the fish and shrimp, maintain the chewy texture of the food during processing, and effectively prevent the loss of juices after the seafood is thawed, which would affect the taste and appearance.
（3）Fruit Juice Drinks
In plant-based protein drinks, such as coconut milk, E451(i) STPP powder can disperse proteins, prevent stratification and sedimentation, and ensure an excellent drinking taste. It can also act as an antioxidant to delay the browning reaction of fruit juice.
（4）Baked Pasta Products
Sodium tripolyphosphate powder can improve dough quality, increase bread volume, prevent starch retrogradation, and extend shelf life. Food-grade STPP is also found in some instant noodles, primarily to optimize texture and prevent breakage after soaking or boiling.
Food-grade STPP has a strong chelating and dispersing ability for metal ions, efficient moisture retention, pH adjustment , and emulsification stability, which determines its important position in the food industry.
Sodium tripolyphosphate and sodium hexametaphosphate are both condensed phosphates, and both have outstanding water-retention capabilities, but their functional focuses differ . Sodium hexametaphosphate emphasizes complexation, dispersion, stabilization, and overall water-retention capacity, while sodium tripolyphosphate is more suited for water retention in protein systems, texture improvement, and applications in meat/seafood processing. Therefore, they are sometimes used in combination in meat and seafood formulations, and they cannot be substituted for each other.
Dipotassium Hydrogen Phosphate , also known as dipotassium hydrogen phosphate, has the chemical formula K₂HPO₄ , CAS 7758-11-4, and E340ii . It is a white crystalline or powdery substance, highly hygroscopic, and extremely soluble in water. Its aqueous solution is weakly alkaline, with a pH of approximately 8.5–9.5.
Food-grade dipotassium phosphate powder is a potassium salt-type orthophosphate , most notably characterized by its strong buffering capacity, excellent water solubility, and ability to provide potassium. It is commonly used in food processing to adjust pH and establish buffer systems . It is widely used in dairy products, beverages, and baked goods.
（1）Dairy Products
Reconstituted milk, flavored milk, plant-based milk , and cheese, and it will not settle even after high-temperature sterilization.
（2）Drinks
Food-grade Dipotassium Hydrogen Phosphate can buffer pH and is fortified with potassium in sports drinks or energy drinks to stabilize the system. As an electrolyte supplement, it replenishes potassium and phosphorus, regulates body fluid pH, and helps with rapid recovery.
（3）Baked Pasta Products
E340ii powder is used in conjunction with baking soda, the dough will have a more uniform fluffiness, increased elasticity and extensibility, and a better taste in the final product.
DKP is a highly efficient pH buffer that can promote yeast fermentation, improve the quality of flour products, and stabilize emulsions. These advantages make it irreplaceable in the food industry.
Sodium acid pyrophosphate, with the molecular formula Na₂H₂P₂O₇, CAS 7758-16-9, E number E450i , is a white, water-soluble powder . Its aqueous solution is acidic, with a pH of approximately 3.5–4.5.
Food-grade SAPP powder is a typical acidic pyrophosphate with a slow dissolution rate and a mild and sustained gas-generating reaction. It is commonly used in the baking industry and is a core leavening agent ingredient. Food additive SAPP powder is used in baking leavening agents, meat products, instant noodles, and seafood processing .
（1）Baking Leavening Agent
Sodium acid pyrophosphate reacts with sodium bicarbonate to produce carbon dioxide. This prolonged gas production and slow reaction rate allow the dough to ferment fully, making it ideal for bread, cookies, muffins, and other fluffy foods. The resulting baked goods have a soft texture and excellent taste.
（2）Meat Products
Food-grade SAPP powder, used in combination with alkaline phosphates , is commonly found in luncheon meat, cooked ham, and canned meat. It has excellent water retention, prevents flaking when sliced, and provides a tender texture.
（3）Instant Noodles
Instant noodles are one of the most common supermarket items. The addition of sodium pyrophosphate to instant noodles prevents them from becoming too soft and mushy during the specified cooking time, resulting in a better texture.
（4）Aquatic product processing
SAPP is commonly added to aquatic and frozen products. It utilizes the chelating properties of metal ions to inhibit crystal formation, which helps maintain moisture, color, and quality.
Food additive sodium acid pyrophosphate is its leavening reaction and acid-base balance in baked goods. This is a unique advantage that other phosphates do not possess.
Disodium hydrogen phosphate has the molecular formula Na₂HPO₄, CAS 7558-79-4 (anhydrous), CAS 10039-32-4 (dodecahydrate), and E339ii. It is a white powder or crystal, readily soluble in water, with an aqueous solution that is weakly alkaline, pH approximately 8.6–9.4.
Food-grade disodium phosphate is a monomeric orthophosphate, a typical buffer salt and acidity regulator . It has a wide range of applications , used in various food industries including baking, dairy products, meat products, and beverages, demonstrating its versatility.
（1）Baking
When making baking dough, pairing it with acidic phosphates effectively buffers and stabilizes fermentation, preventing oxidation and discoloration.
（2）Dairy Products
Food-grade DSP powder acts as an emulsifier in dairy products, effectively restraining casein and preventing protein coagulation and stratification during sterilization, thus giving dairy products a more delicate and silky texture.
（3）Meat Products
Meat products typically require various phosphates for water retention. The food additive disodium phosphate is often used in combination with sodium tripolyphosphate and sodium hexametaphosphate to adjust the overall pH of the meat and synergistically retain water.
（4）Beverages
In various fruit juices and carbonated beverages, food-grade DSP powder can be used as an acidity regulator and flavor stabilizer, optimizing the taste and flavor of the beverage while preventing vitamin C from decomposing and discoloring . If you would like to learn more about isovitamin C, please see this article.
Food additive E339ii gently adjusts pH value, has good stability in dairy processing, and can also improve the water retention of meat products. Anhydrous DSP powder effectively prevents powder agglomeration and has good flowability.
Since this article is already quite long, and to avoid affecting the reader's reading experience, the next article will focus on the characteristics, applications, and advantages of phosphates such as tetrasodium pyrophosphate , trisodium phosphate, dicalcium phosphate , and diammonium phosphate . A simple comparative analysis and selection guide will also be provided.
Stay tuned for the next article! Welcome to follow Polifar! Feel free to leave a comment if you have any questions about food-grade phosphates!
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