Applications and Addition Levels of Several Food-Grade Phosphates

　　Uses and Addition Levels of Several Food-Grade Phosphates – Baidu

　　I. Applications of Sodium Tripolyphosphate: In the food industry, it is primarily used as a quality-improving agent for canned foods, dairy products, fruit juices and beverages, and soy milk; as a water-retaining and tenderizing agent in meat products such as ham and luncheon meat; in seafood processing, it not only helps retain moisture and tenderize the product but also promotes swelling and bleaching; in canned broad beans, it can soften the skins; it can also serve as a water softener, chelating agent, pH regulator, thickening agent, and in the brewing industry. In food processing, sodium tripolyphosphate is typically added at 3–5‰, while in seafood processing the maximum dosage is 3%.

　　II. Uses of Sodium Pyrophosphate (Anhydrous): In food processing, it serves as a quality-improving agent, emulsifying and dispersing agent, buffer, and chelating agent, among other functions. It exhibits the general properties of condensed phosphates, with pronounced chelating and dispersing effects that help prevent flocculation. It can also inhibit lipid oxidation and enhance the viscosity of casein. At higher pH levels, it effectively suppresses food spoilage and fermentation. It is primarily used in meat and aquatic product processing to improve water-holding capacity, maintain tenderness, and stabilize natural pigments. It is also employed in starch production and is often formulated in combination with other condensed phosphates. In food processing, sodium pyrophosphate is typically added at levels of 0.5–3‰; in aquatic product processing, the maximum addition level is 3%.

　　III. Disodium Dihydrogen Pyrophosphate (Acidic Sodium Pyrophosphate): Applications: In food processing, it serves as a rapid leavening agent, quality improver, raising agent, buffer, chelating agent, rehydrating agent, and binding agent. It is used as the acidic component in composite leavening agents for bread, pastries, and other baked goods; its CO2 production occurs over a relatively long period, making it suitable for low-moisture baked products such as pancakes. When compounded with other phosphates, it can be employed as a water-retention agent in the processing of cheese, luncheon meat, ham, meat products, and aquatic products, as well as a rehydrating agent in instant noodles. In general, the addition level in food processing ranges from 0.5 to 3 per thousand, while in aquatic product processing the maximum addition level is 1%.

　　IV. Applications of Sodium Hexametaphosphate: In the food industry, it serves as a quality-improving agent, pH regulator, metal-ion chelating agent, binder, and swelling agent. In bean products, canned foods, and red-bean paste fillings, it stabilizes natural pigments and maintains color; in canned goods, it promotes fat emulsification and ensures uniform texture; when used in meat canning and meat products, it enhances water-holding capacity and prevents fat rancidity. Added to beer, it clarifies the brew and prevents turbidity. It is also an excellent softening agent that produces clear, sediment-free water. In seafood processing, it functions as a water-retaining, swelling, and bleaching agent. The typical addition level in food processing is 3–5‰, while the maximum allowable level in seafood processing is 3%.

　　V. Applications of sodium tripolyphosphate: In the food industry, it is used as a starch modifier, an anti-turbidity agent in fruit juices and beverages, a water-retention agent in meat processing, a binding agent, a chelating agent, a water-softening agent, a dispersant, and a stabilizer for dairy products such as ice cream and cheese. In seafood processing, it serves to enhance binding and retain moisture. It can also prevent food discoloration and the degradation of vitamin C. The typical addition level in food processing is 3–5‰, while the maximum allowable addition in seafood processing is 3%.

　　VI. Applications of Phosphoric Acid: In the food industry, it is used as an acidulant and a nutritional fermentation agent; in bread baking and canned fruits and vegetables, it serves as a specialized water-retention agent that inhibits microbial growth and extends shelf life. It is also added to beverages, fruit juices, cocoa products, cheese, and edible oils. Additionally, it can be employed for emulsification and acidification in cheese flavoring. When used in combination with antioxidants, it helps prevent oxidative rancidity in animal fats such as lard and their derived products; it is also utilized in the refining of sucrose. In food processing, it is typically added at a level of 3–5‰.

　　VII. Trisodium phosphate (anhydrous): Uses: In the food industry, it is used as a buffering agent, emulsifier, and nutritional supplement; it is also employed as an alkaline solution in the preparation of dough-based foods. Additionally, it can be used for the purification of saccharin, the production of starch, and as a detergent for washing food-grade bottles and cans. In food processing, it is typically added at 3–5‰, with a maximum limit of 1%.

　　VIII. Applications of Sodium Polyphosphate: It is suitable for the processing of coarsely minced and emulsified meat products as well as poultry-based foods, including frankfurters, hot dogs, chicken sausages, Taiwanese-style sausages, hamburger patties, ham sausages, instant noodles, rice vermicelli, and rice noodles. As a high-quality seafood additive, it effectively preserves the distinctive flavor of seafood, enhances mouthfeel, reduces processing losses, improves texture, and imparts a glossy, bright, and resilient surface to the product, thereby significantly elevating its quality grade. During processing and freezing, it markedly enhances the binding between meat proteins and moisture, prevents moisture loss during storage, strengthens the interaction between fat and moisture, and thus maintains the edibility and tenderness of the food throughout storage. It also helps to stabilize flavor and color over time and inhibits cell growth. In food processing, the typical addition level is 3–5‰, with a maximum limit of 3%.

　　9. Sodium Acid Aluminum Phosphate Uses: In the food industry, it is used as a leavening agent for fried dough and baked goods. When added to animal feed, it acts as a fat-inhibiting agent in livestock and poultry production, effectively preventing the accumulation of body fat. The recommended addition level in food processing is 1–2%.

　　X. Potassium Tripolyphosphate (Potassium Pentaphosphate) Uses: In food processing, it serves as a moisture-retaining agent, texture-improving agent, chelating agent, and water-quality treatment agent, among others. It is widely used in the processing of meat products such as meat broths, luncheon meats, and cured meats; in the processing of frozen fish fillets and shrimp and other aquatic products; and in the production of dairy products including cream, milk powder, cheese, condensed milk, and cream powder. Potassium tripolyphosphate exhibits excellent solubility and dissolution rate, resulting in higher yields and superior taste compared with traditional phosphates when used. The recommended addition level in food processing is 3–5‰.

　　XI. Sodium Dihydrogen Phosphate Uses: In the food industry, it serves as a quality improver, pH regulator, buffer, emulsifier and dispersant, nutritional fortifier, and moisture-retention agent. It is primarily used in cheese, beverages, jellies, tomato sauce, luncheon meat, and cured meat products, and can also be employed as an additive for modified starch. The recommended addition level in food processing is 3–5‰.

　　XII. Disodium Hydrogen Phosphate Uses: In the food industry, it serves as a quality improver, pH regulator, nutritional supplement, emulsifier and dispersant, fermentation aid, and binder. It is primarily used in flour-based foods, soy milk products, dairy products, meat products, cheese, beverages, fruit products, ice cream, and tomato sauce. The recommended addition level in food processing is 3–5‰.

　　XIII. Potassium Pyrophosphate Uses: In the food industry, it is used as an emulsifier, texturizing agent, and chelating agent; it also serves as a raw material for alkaline solutions used in dough products, often in combination with other condensed phosphates. It is commonly employed to prevent struvite formation in canned aquatic products and to inhibit discoloration in fruit canned goods; to enhance the overrun of ice cream; to increase the yield of ham and sausages and improve the water-holding capacity of fish surimi; to improve the flavor of flour-based products and boost their yield; and to retard the aging of cheese. Addition levels in food processing: 9 g/kg (expressed as phosphorus) for processed cheese; 3 g/kg (expressed as P₂O₅) for luncheon meat; and 5 g/kg (expressed as P₂O₅) for quick-frozen shrimp.