DIPOTASSIUM PHOSPHATE

CAS: 7758-11-4 EMULSIFIER OR EMULSIFIER SALT, NUTRIENT SUPPLEMENT, PH CONTROL AGENT, SEQUESTRANT, STABILIZER OR THICKENER

Dipotassium phosphate (CAS 7758-11-4) is a water-soluble inorganic phosphate salt used in foods as an emulsifier or emulsifier salt, nutrient supplement, pH control agent, sequestrant, and stabilizer or thickener.

What It Is

Dipotassium phosphate is a mineral salt widely used in the food industry for its multifunctional properties. It is identified chemically as the dipotassium salt of phosphoric acid, with the CAS number 7758-11-4 and several synonyms including dibasic dipotassium phosphate and dipotassium hydrogen phosphate. In international food additive nomenclature, it corresponds to the INS designation 340(ii), as listed by the Codex Alimentarius and JECFA. Its functions in food span from acting as an acidity regulator and buffering agent to functioning as a sequestrant and emulsifier salt. As a food additive ingredient, dipotassium phosphate is typically encountered as a white, crystalline powder that dissolves readily in water, releasing potassium and phosphate ions. These ions help to regulate pH, stabilize emulsions, and support product texture and shelf life in a range of processed foods. The compound’s inclusion in ingredient lists reflects its regulatory acceptance for specific technical purposes rather than being an essential nutrient in itself. Its multiple roles arise from its chemical ability to interact with water, proteins, and other components in complex food matrices.

How It Is Made

Industrial production of dipotassium phosphate generally involves neutralization chemistry between phosphoric acid and a potassium source. One common route uses stoichiometric amounts of phosphoric acid reacted with potassium hydroxide under controlled conditions, yielding dipotassium phosphate and water as byproducts. The resulting product is then purified and crystallized to meet food-grade specifications, removing potential contaminants to align with regulatory purity standards. High-purity food-grade dipotassium phosphate must meet stringent quality criteria, particularly regarding heavy metals, water content, and assay purity. Regulatory agencies and international compendia such as Codex Alimentarius provide monographs and specifications that food-grade salts must satisfy. These quality criteria ensure that the additive performs consistently in its technological functions and does not introduce unwanted impurities into the finished food product. The manufacturing and quality control processes are designed to achieve reproducible physical and chemical properties while aligning with good manufacturing practices.

Why It Is Used In Food

Dipotassium phosphate is incorporated into foods and beverages because of its ability to fulfill multiple functional needs in formulation. As an emulsifier or emulsifier salt, it helps stabilize mixtures of water and fat, reducing separation and improving texture and mouthfeel in products like non-dairy creamers and processed cheese. Its role as a pH control agent and buffering compound makes it valuable in formulations that require consistent acidity levels to preserve flavor and quality. As a nutrient supplement, the phosphate component contributes to the overall phosphorus content of a product, which is a mineral essential to many biological processes, while the potassium component contributes to electrolyte balance in nutritional formulations. Sequestrant function enables dipotassium phosphate to bind metal ions that might otherwise catalyze degradation or discoloration of food components, improving shelf life and product stability. These technological benefits make it a versatile ingredient in a wide array of formulations where stability, solubility, and texture control are priorities.

Adi Example Calculation

An illustrative calculation of intake based on an ADI or tolerable intake level can help clarify how such guidance values are applied. Although specific numeric ADIs for dipotassium phosphate alone are not assigned separately from total phosphorus intake in available regulatory evaluations, consider a hypothetical scenario where a guidance value is expressed in terms of phosphorus for an adult. For example, if a regulatory body defines a reference intake level for phosphorus additives of 40 mg per kilogram of body weight per day (expressed as phosphorus), an adult weighing 70 kilograms could theoretically have a total intake of 2,800 mg of phosphorus from all food sources without exceeding the guidance. This example is illustrative of how total dietary exposure is compared with guidance numbers and is not personal dietary advice.

Safety And Health Research

Safety assessments of dipotassium phosphate and related phosphate additives conducted by international expert bodies focus on hazard identification, exposure assessment, and the technological necessity of their use. Phosphate salts, including dipotassium phosphate, have been regarded as having low acute oral toxicity and are not associated with genotoxic or carcinogenic effects based on the available toxicological data. Evaluations by JECFA classified dipotassium hydrogen phosphate within functional classes such as acidity regulators and sequestrants and considered tolerable intake levels for phosphorus from all dietary sources combined. Regulatory reviews also emphasize that the safety of phosphate additives should be considered within the context of total dietary phosphorus intake, as the body regulates inorganic phosphate and potassium through normal physiological mechanisms. Research continues to investigate exposure levels, especially in populations with conditions that affect mineral balance, but mainstream evaluations by agencies like JECFA provide a scientific foundation for permitted uses under good manufacturing practices. These safety assessments are designed to identify potential hazards and define intake contexts where the food additive’s use does not pose appreciable risk.

Regulatory Status Worldwide

In the United States, dipotassium phosphate is listed in the FDA’s inventory of food substances and indirect food additives. It appears in specific sections of the Code of Federal Regulations such as 21 CFR 182.6285, which states that dipotassium phosphate is generally recognized as safe (GRAS) when used in accordance with good manufacturing practice. This regulatory listing indicates that the FDA has reviewed evidence supporting its use for intended technological purposes under specified conditions. Similar listings in other parts of the CFR reflect its inclusion in various food additive and packaging inventories for authorized uses. Internationally, the Food and Agriculture Organization and World Health Organization’s Joint Expert Committee on Food Additives (JECFA) has evaluated dipotassium hydrogen phosphate and assigned it the INS number 340(ii) under the Codex General Standard for Food Additives. JECFA evaluations provide specifications and a tolerable intake level expressed for phosphorus-containing additives from all sources. The Codex GSFA lists dipotassium hydrogen phosphate and its synonyms, confirming its recognition as an acceptable food additive with defined technological functions. Regulatory frameworks outside the United States often align with Codex and regional safety assessments when authorizing phosphate salts for food use.

Taste And Functional Properties

Dipotassium phosphate is generally considered to have a neutral taste when used at the low levels typical in food formulations, which helps avoid unintended sensory impacts. In aqueous solutions, it dissociates into potassium and phosphate ions, and because of this behavior it acts as a buffering agent, helping maintain pH within a desired range. This moderate buffering capacity supports flavor stability and processing consistency, particularly in heat-treated or high-protein products. Its solubility in water facilitates its use in beverages, dairy analogs, and powdered products. Dipotassium phosphate’s functional properties also include interaction with proteins to prevent precipitation or coagulation under varying conditions of pH and temperature. These interactions help maintain a smooth mouthfeel and prevent sedimentation in liquid products. Because of its ionic character, it does not significantly alter flavor on its own at permitted use levels, which is why formulators rely on it for technical performance without sensory compromise.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) or tolerable intake level is a health-based guidance number used by food safety authorities to describe the amount of a substance that can be consumed daily over a lifetime without appreciable risk. For phosphate additives such as dipotassium phosphate, international evaluations have historically expressed tolerable intakes in terms of total phosphorus from all dietary sources. JECFA has assigned a group tolerable intake level for phosphorus-containing additives, recognizing that phosphorus is an essential nutrient and ubiquitous in foods. This approach reflects that the additive contributes to overall phosphorus exposure rather than posing intrinsic toxicity at low use levels. Regulatory bodies also account for the fact that phosphorus and potassium are naturally present in many foods and are necessary for normal bodily functions. Therefore, ADI concepts for these additives often consider both natural dietary sources and additive contributions. When an ADI or tolerable intake is established, it incorporates safety factors to ensure protective limits well below levels associated with adverse effects. Understanding how these guidance values relate to real-world exposure helps regulators balance functional food technology with consumer safety.

Comparison With Similar Additives

Dipotassium phosphate belongs to a broader class of phosphate-based food additives that includes salts such as monopotassium phosphate (INS 339(i) and trisodium phosphate (INS 339(iii)). While all phosphate salts act as buffering agents and pH regulators, their cationic partners influence their solubility, ionic strength, and buffering range. For example, monopotassium phosphate often functions as an acidifying buffer in products where a slight acidity is desired, whereas dipotassium phosphate provides a more neutral to alkaline buffering capacity. Sodium phosphate salts may be used when sodium content aligns with formulation goals, whereas potassium-based salts can support electrolyte balance in nutritional beverages. Other sequestrants like citrates or EDTA may bind metal ions similarly to phosphates, but phosphates often provide additional buffering capacity. Compared with organic acids, phosphate salts have less impact on flavor while still contributing to stability and texture. These differences illustrate how formulators choose specific additives based on the technical requirements of the product and the desired balance of functional performance, sensory attributes, and regulatory compliance.

Common Food Applications Narrative

Dipotassium phosphate is found in a range of food and beverage products where its multifunctional properties are required for technological success. In powdered beverage mixes and instant drink formulations, it helps maintain consistent solubility and dispersion of ingredients, reducing clumping and supporting a smooth rehydrated texture. In non-dairy creamers and plant-based beverages, dipotassium phosphate supports pH stability and prevents mineral-driven protein aggregation that can lead to a gritty mouthfeel or separation during storage. Processed cheese and other emulsified cheese products often rely on phosphate salts such as dipotassium phosphate to stabilize the fat-protein matrix, improving texture and sliceability. In sports nutrition powders and electrolyte drinks, it contributes to mineral balance while helping control acidity for flavor and stability. Meat products and prepared foods may include it as a sequestrant and pH regulator to suppress metal-catalyzed oxidation and support colour stability. Across these applications, dipotassium phosphate’s technical functions help manufacturers achieve consistent quality and shelf life. Its use reflects regulatory allowances for specific technological purposes rather than nutritional fortification.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 182.6285

EFSA

  • Approved: True
  • E Number: E340(ii)
  • Adi Display: 40 mg per kg body weight per day as phosphorus
  • Adi Mg Per Kg: 40

JECFA

  • Year: 1982
  • Ins Number: 340(ii)
  • Adi Display: Group tolerable intake 70 mg per kg body weight per day as phosphorus

Sources

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