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Dipotassium phosphate (DKP), also known as potassium phosphate dibasic, is a water-soluble inorganic salt used across the food industry for its buffering capacity, sequestration of divalent cations, emulsifying-salt performance and nutritional contribution of potassium and phosphorus. It has been used as a food additive and processing aid since the 1940s and today appears in processed cheese, non-dairy creamers, instant noodles, powdered drink mixes and dairy-based beverages.
For product developers, the key technical questions are not simply whether dipotassium phosphate regulates pH, but how its dibasic nature, alkaline buffering range, protein interactions and phosphate regulation interact with the rest of the formula, the processing route and the destination-market limits. This guide consolidates those considerations into a practical B2B formulation framework.
| Function | Suitable Users | Core Technical Indicators | Compliance Framework |
|---|---|---|---|
| Buffering agent and acidity regulator | Dairy, beverage and sauce manufacturers needing stable pH through processing and shelf life in neutral to slightly alkaline systems | CAS 7758-11-4; molar mass 174.2 g/mol; pH of 1% solution about 8.7 to 9.4; highly water-soluble at about 149 g/100 mL at 20 °C | GRAS as a sequestrant under 21 CFR 182.6285; EU additive E340(ii); applicable national phosphate limits |
| Emulsifying salt | Processed-cheese and dairy-alternative producers seeking smooth melt, uniform texture and resistance to oil separation | Interacts with casein by ion exchange, replacing calcium and unfolding protein to emulsify fat; used at roughly 1.6 to 2.6% in processed cheese | Counted within phosphate limits for the cheese category; labeling and maximum levels differ by market |
| Sequestrant and antioxidant aid | Developers of fat-rich, oxidation-prone products and powdered systems where metal-catalyzed rancidity and caking are concerns | Chelates copper, iron and lead to prevent prooxidant action; supports dispersibility and reduces caking in powders | Use level must remain within category-specific phosphate maxima or quantum satis conditions |
| Potassium and phosphorus nutrient source | Nutrition formulators, sports-nutrition brands and clinical-nutrition producers fortifying with potassium or phosphate | Supplies both potassium and phosphate; used in electrolyte replenishment and total parenteral nutrition; ionic and highly soluble | Nutrition labeling, nutrient-enrichment rules and pharmaceutical-grade requirements where applicable |
Dipotassium phosphate is a synthetic dibasic phosphate salt of inorganic nature, obtained industrially by treating phosphoric acid with potassium compounds such as potassium carbonate or potassium hydroxide. Its chemical formula is K2HPO4, composed of two potassium ions and one phosphate unit.
Physically, DKP is a white, odorless powder with a slightly bitter taste and a hygroscopic character that must be managed in storage. It is a food-grade, multi-purpose additive whose principal roles are buffering, stabilizing, regulating acidity, sequestering metal ions, acting as a raising agent and functioning as a texturizer. The same properties that make it useful in food also make it valuable in fertilizers and in several technical applications.
From a formulator's perspective, the practical importance of DKP lies in the fact that it shifts a system toward alkaline conditions while simultaneously binding the divalent cations that trigger protein coagulation, color loss and oxidative rancidity, which is why the salt appears both in cheese emulsification and in beverage stabilization.
Explore the dipotassium phosphate technical encyclopedia for additional chemical and application information.
| Parameter | Specification / Description |
|---|---|
| Chemical name | Dipotassium hydrogen phosphate |
| Common names | Dipotassium phosphate, potassium phosphate dibasic, DKP |
| Molecular formula | K2HPO4 |
| Molar mass | 174.2 g/mol |
| CAS Number | 7758-11-4 |
| EC Number | 231-834-5 |
| E number | E340(ii) |
Dipotassium phosphate is a functional additive rather than a bulk ingredient. Its value comes from three interacting behaviors: buffering, ionic interaction with proteins and chelation of metal ions. Together these explain nearly every food application in which the salt appears.
When DKP dissolves in water it releases potassium and phosphate ions that resist changes in pH, holding the medium near its natural alkaline range of about 8.7 to 9.4 in a 1 percent solution. This buffering capacity stabilizes pH-sensitive ingredients, supports protein stability and helps maintain consistent taste and structure through processing and storage.
In processed cheese, DKP acts as an emulsifying salt by exchanging potassium ions for the divalent calcium bound to casein. This exchange unfolds the protein and exposes its lipophilic and hydrophilic regions, allowing it to coat fat droplets and form a homogeneous, stable matrix. The same mechanism stabilizes the protein layer around fat droplets in dairy alternatives, helping to prevent syneresis and curdling in hot beverages.
DKP binds metal ions such as copper, iron and lead, preventing them from participating in the oxidative reactions that cause discoloration, off-flavors and rancidity in fat-rich foods. This sequestration also supports dispersibility and reduces caking in powdered products.
Dipotassium phosphate is produced synthetically by neutralizing phosphoric acid with a potassium base such as potassium hydroxide or potassium carbonate. The reaction stoichiometry is controlled so that two of the three acidic protons of phosphoric acid are neutralized, yielding the dibasic salt rather than the monobasic or tribasic forms. The resulting solution is then purified, concentrated and crystallized, and the product is supplied as an anhydrous powder or in hydrated forms depending on the specification.
Because the monobasic, dibasic and tribasic potassium phosphates are made from the same feedstocks, manufacturers rely on tight process control and analytical verification to ensure the correct degree of neutralization. For food-grade material, buyers should confirm assay, pH of a standard solution, loss on drying, heavy-metal limits, fluoride content where applicable, particle size and microbiological quality, and should match each batch certificate against the approved purchasing specification.
From a formulation perspective, the most relevant comparison is among the potassium and sodium phosphate salts, because they share a common phosphate anion but differ in degree of neutralization, pH, cation supplied and regulatory treatment. Grouping them correctly is essential, because a specification written for one member does not transfer to another.
Dipotassium phosphate is the dibasic member of the family and the most alkaline of the common potassium phosphates in practical use. It supplies two potassium ions per phosphate unit, which makes it attractive both as a buffer and as a potassium source in electrolyte and nutrition applications.
Monopotassium phosphate is acidic and is used where a lower pH is required, while tripotassium phosphate is more strongly alkaline and is used for different buffering and emulsifying objectives. Because each has a distinct pH profile and its own additive identifier, they should be selected on the basis of the target pH and the required cation contribution rather than on phosphate content alone.
Sodium phosphates such as disodium phosphate perform many of the same buffering, sequestering and emulsifying functions but introduce sodium rather than potassium. In reduced-sodium or potassium-fortified products, potassium phosphates are often preferred precisely because they deliver the same technical function while shifting the mineral profile toward potassium.
| Parameter | Dipotassium Phosphate | Monopotassium Phosphate | Disodium Phosphate |
|---|---|---|---|
| CAS number | 7758-11-4 | 7778-77-0 | 7558-79-4 |
| Chemical type | Dibasic potassium phosphate; alkaline in solution | Monobasic potassium phosphate; acidic in solution | Dibasic sodium phosphate; alkaline in solution |
| Molar mass | 174.2 g/mol | 136.09 g/mol | 141.96 g/mol |
| Water solubility | Very high, about 149 g/100 mL at 20 °C | High but lower than DKP | High, suitable for liquid systems |
| Primary use | Emulsifying salt, alkaline buffer and potassium source | Acid-side buffering and nutrient media | Buffering and sequestering where sodium is acceptable |
| Formulation advantage | Combines alkaline buffering with potassium fortification | Effective where a lower pH is required | Low-cost and widely available |
| Key limitation | Alkaline shift and bitter note must be managed in the matrix | Acidic character limits use in alkaline systems | Contributes sodium, which may be undesirable |
| Property | Typical Description |
|---|---|
| Appearance | White powder or crystals |
| Odor | Odorless, with a slightly bitter taste |
| Density | About 2.44 g/cm3 |
| Melting point | Decomposes above 465 °C rather than melting cleanly |
| Solubility | About 149.25 g/100 mL in water at 20 °C; slightly soluble in alcohol |
| pH (1% solution) | 8.7 to 9.4, reflecting its alkaline buffering range |
| Acidity / basicity constants | pKa about 12.4 and pKb about 6.8 for the relevant equilibria |
| Function | Typical Applications | Key Formulation Objective |
|---|---|---|
| Emulsifying salt | Processed cheese and cheese analogs where melt, texture and shape retention are critical | Disperse protein and lipid into a homogeneous matrix and prevent oil separation on heating |
| Stabilizer and anti-coagulant | Non-dairy creamers, dairy beverages and evaporated milk, including hot-beverage applications | Prevent feathering and protein coagulation while maintaining a stable dispersion |
| Buffering and acidity regulation | Soft drinks, flavored beverages, sauces and powdered foods requiring stable pH | Hold pH within a defined window to protect taste, color and shelf life |
| Dough conditioner and texturizer | Instant noodles, pasta and bakery products where elasticity and rehydration matter | Modify starch gelatinization and gluten behavior to improve elasticity and rehydration |
| Sequestrant and antioxidant aid | Fat-rich sauces, powdered mixes and products sensitive to metal-catalyzed oxidation | Bind copper, iron and lead to protect flavor and color and extend shelf life |
Dipotassium phosphate is especially important in processed cheese, where it maintains a smooth, uniform texture and prevents the cheese from separating into oil and protein. In powdered drink mixes and coffee creamers it prevents clumping and improves dispersion, while in instant noodles it improves starch pasting behavior and elasticity at concentrations around 0.3 percent. These applications illustrate a common theme: the salt is almost always used to control a physical or chemical transition rather than to add flavor of its own.
Begin by identifying whether DKP is present to buffer, to emulsify, to sequester metals or to supply potassium, because each objective implies a different use level and a different point of addition. Typical use levels range from 0.05 percent to about 2 percent or more, and the level should be justified by the target function rather than copied from an unrelated product.
Verify identity, assay, pH of a standard solution, loss on drying, heavy-metal limits and particle size against the approved purchasing specification. Because the potassium phosphates are closely related, confirm that the material is genuinely the dibasic salt and not the monobasic or tribasic form, and match each certificate of analysis to that specification.
Phosphate limits are usually set for the category as a whole rather than for a single salt, so calculate the total phosphate contributed by DKP together with any other phosphate-containing ingredients. The dosage range of 0.05 to 2 percent must also be checked against the category maximum, whether expressed as a numerical limit or as quantum satis.
Because DKP raises pH, confirm that the resulting shift is compatible with the flavor, color and stability requirements of the product, and taste the finished formulation for the slightly bitter or metallic note that phosphates can impart at higher levels. Adjust the buffering system rather than relying on DKP alone when the required pH window is narrow.
Emulsification, sequestration and texturizing behavior all depend on the rest of the formulation, so confirm performance through pilot-scale trials. For cheese, evaluate melt, flow and shape retention; for beverages, verify resistance to feathering; for noodles, check rehydration and elasticity. Finished-product testing, not theoretical addition, determines the practical result.
The following formulation is an illustrative technical example rather than a universal commercial recipe. Actual ingredient levels must be recalculated according to the target texture, pH, mineral profile and destination-market requirements.
| Ingredient | Illustrative Quantity | Technical Role |
|---|---|---|
| Corn syrup solids | 60.0% | Carrier and bulking phase of the spray-dried creamer |
| High lauric vegetable fat | 32.0% | Lipid phase contributing whitening and mouthfeel |
| Sodium caseinate | 3.5% | Protein emulsifier stabilizing the oil phase |
| Mono- and diglycerides | 1.5% | Secondary emulsifier for emulsion stability |
| Dipotassium phosphate | 2.7% | Buffering and anti-feathering stabilizer protecting the protein dispersion |
| Sodium carbonate | 0.3% | pH adjustment supporting the buffering system |
In the published example structured in this way, the non-dairy creamer powder showed significantly improved resistance to feathering, meaning the precipitation of serum protein from the dispersion. That outcome reflects the core value of dipotassium phosphate: it protects a protein-stabilized emulsion against the destabilizing conditions encountered when the powder is reconstituted in a hot beverage.
Regulatory treatment of dipotassium phosphate depends on both its identity as a phosphate salt and the intended use of the finished product. A supplier's statement that a material is "food grade" does not by itself establish compliance in every destination market, and phosphate limits are frequently set for the food category rather than for the individual salt.
| Market / Framework | Technical Relevance | Compliance Action |
|---|---|---|
| United States FDA | Dipotassium phosphate is considered GRAS as a sequestrant under 21 CFR 182.6285 and is permitted as a multipurpose food ingredient up to the limits of good manufacturing practice. | Confirm the intended food category, use level and labeling, and verify the current applicable provisions before launch. |
| European Union | Dipotassium phosphate is authorized as food additive E340(ii), with maximum permitted levels set per category and quantum satis allowed in specified uses. | Check Annex II to Regulation (EC) No 1333/2008 for the precise category and level, and account for all phosphate sources in the formula. |
| National food authorities | Individual countries may set their own permitted uses and maximum phosphate levels, which can differ from regional frameworks. | Verify the current national requirements for each intended sales market rather than assuming regional harmonization. |
| EFSA / JECFA | EFSA and JECFA have evaluated phosphates as a group and established group acceptable daily intakes expressed as phosphorus, reflecting the cumulative nature of dietary phosphate exposure. | Assess total phosphate exposure from all additives and ingredients and compare against the current group reference values. |
| EU REACH | REACH obligations depend on the substance, the manufacturer or importer, the tonnage and any applicable exemptions or downstream-use conditions. | Verify the exact REACH status for the supply chain rather than assuming food use removes every industrial-chemical obligation. |
| EU BPR | The Biocidal Products Regulation is generally not the governing framework for dipotassium phosphate used solely as a food additive. | BPR becomes relevant only where the substance or finished product is placed on the market for a biocidal purpose. |
| ISO 22000 / HACCP | Food-safety management systems support control of contamination, traceability and manufacturing hazards throughout production and packing. | Maintain supplier qualification, batch traceability and validated quality procedures for the finished product. |
Dipotassium phosphate is generally considered safe at the quantities typically used in food, and it has been affirmed as GRAS for its intended uses by major authorities. Its principal safety consideration is not acute toxicity but the cumulative effect of dietary phosphate, because excessive phosphate intake can disrupt the balance of phosphates in the body and may contribute to health complications over time.
Because phosphates from different additives accumulate against a shared reference value, formulators should evaluate the total phosphate load of a product rather than the contribution of DKP alone. Potassium is also relevant: products fortified with potassium salts should account for the total potassium delivered per serving, particularly where reduced-sodium formulations increase the potassium contribution.
For manufacturers, the most important safety principle is to keep the additive within its authorized use and to avoid marketing claims that exceed permitted nutrient-content or health claims. DKP is a processing aid and mineral source, not a therapeutic agent, and any statement about its effects should be traceable to a current regulatory or expert-panel position.
| Reference Point | Illustrative Value |
|---|---|
| Typical use level in food | About 0.05% to 2% or more, depending on function |
| EU phosphate maximum levels | Commonly 500 to 20,000 mg/kg across authorized categories, with quantum satis in some uses |
| Use in processed cheese | About 1.6% to 2.6% emulsifying salt |
| Use in instant noodles | About 0.3% of the formulation for pasting improvement |
These values are illustrative references drawn from published sources and should not be interpreted as universal legal maximums. Product developers should use the current category-specific limits applicable to the intended market and should account for total phosphate from all sources.
It is used as a buffering agent, stabilizer, acidity regulator, sequestrant, emulsifying salt and texturizer, and as a source of potassium and phosphorus. Its most significant applications are processed cheese, non-dairy creamers, powdered drink mixes and instant noodles, where it controls pH, prevents protein coagulation and improves texture and dispersion.
No. Dipotassium phosphate is K2HPO4, a dibasic potassium salt, while monosodium phosphate is an acidic sodium salt. They differ in pH behaviour, in the cation they supply and in their regulatory identifiers, so they cannot be substituted for one another on a weight-for-weight basis without reformulating and re-checking the target-market limits.
Yes. A 1 percent aqueous solution has a pH of about 8.7 to 9.4, so DKP shifts a system toward alkaline conditions and buffers it there. This can be an advantage for protein stabilization, but it must be balanced against the pH window required by other ingredients and by the sensory and safety targets of the finished product.
Qualification should cover identity and correct degree of neutralization, assay, pH of a standard solution, loss on drying, heavy-metal limits, fluoride where applicable, particle-size distribution and microbiological quality. For critical applications, manufacturers should also evaluate batch consistency, dissolution behavior and the supplier's quality-management and traceability systems.
| Identifier | Value | Resource |
|---|---|---|
| Chemical name | Dipotassium hydrogen phosphate | Technical encyclopedia |
| CAS Number | 7758-11-4 | Chemical dictionary |
| CAS product lookup | 7758-11-4 | Supply search |
| Supplier / trade search | 7758-11-4 | Supplier search |
1. U.S. Food and Drug Administration. Code of Federal Regulations Title 21, 21 CFR 182.6285: Potassium phosphate, dibasic, GRAS as a sequestrant.
2. European Parliament and Council. Regulation (EC) No 1333/2008 on food additives, Annex II, E340(ii) dipotassium phosphate.
3. European Food Safety Authority. Re-evaluation of phosphoric acid and phosphates (E 338-341, E 343, E 450-452) as food additives, EFSA Journal.
4. Joint FAO/WHO Expert Committee on Food Additives. Evaluation of certain food additives: phosphates, group acceptable daily intake.
5. Journal of Dairy Science. Emulsifying salt effects on the meltability and texture of processed cheese.
6. Food Research International. Effect of phosphate addition on the pasting properties of instant-noodle starch systems.
7. African Journal of Biotechnology. Phosphates as combined preservatives with nisin, EDTA, nitrite and erythorbate.
8. Codex Alimentarius Commission. General Standard for Food Additives: provisions for potassium phosphates.
9. Spectrum Chemical. Dipotassium phosphate anhydrous food-grade product specification and data sheet.
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