Industrial grade Food Grade Trisodium phosphate 7601-54-9 TSP

What is Trisodium phosphate? How does it work?

Trisodium phosphate, also known as trisodium phosphate, is a sodium orthophosphate salt formed by the complete neutralization of phosphoric acid and sodium hydroxide. Its molecular formula is Na3PO4, and its CAS number is 7601-54-9 (commonly traded as the dodecahydrate Na3PO4·12H2O). It is a colorless to white crystalline powder, readily soluble in water, and its aqueous solution is strongly alkaline (pH approximately 11.5-12.1 in a 1% solution). In the food industry, it is an important moisture-retaining agent and quality improver: used for water retention in ham, meat, fish, shrimp, crab, and other products; for quality improvement in cheese, canned goods, fruit juice, beverages, and dairy products; and also as a food-grade emulsifier, nutritional supplement, and detergent for food-grade bottles and cans, as well as for purifying sugar juice during the sugar-making process.

Basic information : Chinese name: Trisodium phosphate (also known as sodium orthophosphate, anhydrous trisodium phosphate); English name: Trisodium phosphate (also known as Sodium phosphate tribasic, Trisodium orthophosphate, abbreviation TSP); CAS number: 7601-54-9; EINECS number: 231-509-8; Molecular formula: Na3PO4 (commonly traded as dodecahydrate Na3PO4·12H2O); Molecular weight: approximately 163.94 (anhydrous); Appearance: colorless to white crystals or crystalline powder, odorless; readily soluble in water, insoluble in ethanol; Aqueous solution is strongly alkaline (1% aqueous solution pH approximately 11.5-12.1); Melting point of anhydrous form: approximately 1340℃; Density: approximately 2.54 g/cm³; Hygroscopic; Food-grade specifications are in accordance with the requirements for food additives (moisture retainers).

Structurally , trisodium phosphate consists of three sodium ions and one orthophosphate ion: the phosphorus atom is located at the center, forming a tetrahedron with four oxygen atoms, and the phosphate ion carries three negative charges, which are balanced by the three sodium ions through ionic bonds. Orthophosphate (PO4³⁻) is the form in which all three hydrogen atoms of phosphate are neutralized. It undergoes strong hydrolysis in water to produce hydroxide ions, resulting in a strong alkaline state. At the same time, the phosphate ion can coordinate with metal ions such as calcium, magnesium, and iron. This is the structural basis for its role in water retention, complexation, and acid-base regulation in food processing.

Physically , trisodium phosphate is a colorless to white crystalline powder, odorless; readily soluble in water, insoluble in ethanol; its aqueous solution is strongly alkaline (pH of 1% aqueous solution is approximately 11.5-12.1); the anhydrous form has a melting point of approximately 1340℃, and the dodecahydrate has a melting point of approximately 73.4℃; its density is approximately 2.54 g/cm³; it is hygroscopic and efflorescent in dry air; it requires sealed and moisture-proof storage.

Chemically , trisodium phosphate is a strong base-weak acid salt: phosphate ions hydrolyze strongly in water, making the aqueous solution strongly alkaline; phosphate ions can complex with metal ions such as calcium, magnesium, and iron; it increases the ionic strength of the solution, promoting the dissolution and cross-linking of proteins; it absorbs moisture and effloresces during heating or long-term storage; its alkalinity can affect the texture and flavor of food by adjusting the pH of the system.

Why does trisodium phosphate play these roles in food processing such as meat, poultry, seafood, dairy products, canned beverages, and sugar refining? Its mechanism of action mainly includes the following:

1.Strong alkaline hydrolysis mechanism 

Phosphate ions hydrolyze in water to produce hydroxide ions, and the aqueous solution is strongly alkaline—the basis for adjusting the pH of food and processing systems.

2.Metal ion complexation mechanism 

Phosphate ions chelate metal ions such as calcium, magnesium, and iron, preventing discoloration and deterioration caused by metal ions—the basis for quality improvement and color protection.

3.Protein water retention and binding mechanism 

Increasing the ionic strength of the system promotes the dissolution of salt-soluble proteins and enhances the cross-linking between proteins, forming a water-retaining network—the basis for water retention and binding in meat, poultry and aquatic products.

4.Acid-base buffering mechanism 

Phosphate ions maintain the acid-base balance of the system between hydrolysis and neutralization—the basis for pH regulation in beverages, canned goods, and dairy products.

5.Phosphorus nutrient supply mechanism 

Provide absorbable inorganic phosphorus to replenish phosphorus nutrients from processing and storage—the basis of nutrient supplementation.

All Uses of Food-Grade Trisodium Phosphate

1. Meat, poultry and aquatic product processing sector

Moisture retention agent

It is used as a moisture retainer and quality improver for meat, fish, shrimp, crab and Western-style ham products to improve water retention and binding strength, and improve tenderness, taste and yield.

Corresponding products: Western-style ham, meat products, fish, shrimp and crab products, processed aquatic products, etc.

2. Cheese and Dairy Products Sector

Cheese emulsifiers and quality improvers

It is used as an emulsifier and quality improver in cheese processing to improve the emulsification and texture of cheese, and is also used for quality regulation of dairy products.

Corresponding products: cheese, processed cheese, dairy products, etc.

3. Canned Food and Beverage Sector

Quality improvers for canned goods, juices and beverages

It is used as a quality improver for canned goods, juices, beverages and dairy products, maintaining flavor, color and texture by complexing metal ions and adjusting pH.

Corresponding products: canned fruit, canned meat, fruit juice, fruit-flavored drinks, etc.

4. Nutrition and Food Ingredients

Nutritional supplements

As a food supplement, it provides absorbable inorganic phosphorus and is used for phosphorus supplementation in fortified foods and supplements.

Corresponding products: fortified foods, phosphorus-fortified drinks, dietary supplements, etc.

Food processing emulsifiers

It serves as an emulsifier component in food processing, participating in the construction and stabilization of emulsion systems.

Corresponding products: emulsified foods, sauce emulsions, processed food ingredients, etc.

5. Sugar processing industry

Sugar juice purifier

It is used as a sugar juice purifier and aid in the sugar production process for the purification and clarification of sugar juice.

Corresponding products: sugar juice purifier, sugar refining aid, sucrose and beet sugar processing, etc.

6. Hygiene in the food industry

Food-grade bottle and can detergent

As a detergent component for food industry bottles (cans) and equipment, it utilizes alkalinity and detergency to clean food containers and processing equipment.

Corresponding products: food bottle and can cleaner, food equipment cleaner, CIP cleaning components, etc.

Summary

Trisodium phosphate (CAS 7601-54-9) is a sodium orthophosphate salt formed by the complete neutralization of phosphoric acid. It consists of three sodium ions and one orthophosphate group. The phosphate group hydrolyzes strongly in water, producing a highly alkaline solution, and can also complex metal ions, increasing ionic strength and supplying phosphorus nutrition—making it a versatile ingredient in food processing. It is a water-retaining agent for ham and seafood products, a quality improver for cheese, canned goods, fruit juices, and dairy products, a phosphorus supplement for fortified foods, and a processing aid for bottle and can washing and sugar purification in the food industry. With its unique role as an orthophosphate, it silently supports many aspects of the modern food industry, from meat and poultry to dairy products and beverages, from nutritional fortification to food hygiene. Understanding its strong alkalinity and phosphate characteristics helps explain why it has become a key component in food additives, offering multiple functions.