CALCIUM PHOSPHATE, DIBASIC
Calcium phosphate, dibasic (CAS 7757-93-9) is a white, odorless, tasteless inorganic powder used as a multifunctional food additive that includes roles such as anticaking, leavening agent, dough conditioner, and nutrient supplement and is recognized in international specification monographs.
What It Is
Calcium phosphate, dibasic is an inorganic compound composed of calcium cations and phosphate anions with the formula CaHPO4. It is commonly identified under INS number 341 (ii), indicating its classification among food additives that include flour treatment agents and yeast food functions as defined in international food additive specifications. The appearance of this substance is typically a white, odorless, tasteless powder that is stable under normal storage conditions and has very low solubility in water. In food applications, it is included in a broad range of technological classes because it can influence texture, flow properties, moisture retention, and mineral fortification in food formulations. While this compound has a well-established role in industrial chemistry and material science, within food science it is specifically tailored to add technological functionality when incorporated according to good manufacturing practice. Calcium phosphate, dibasic is one of several calcium phosphate salts used in food and nutritional products; others include monocalcium and tricalcium phosphates. It can be distinguished from these by its ratio of calcium to phosphate ions and its functional behaviors in formulations. Its classification as "dibasic" refers to the type of phosphate species it contains, with one hydrogen atom still bound to the phosphate moiety, which confers certain physical and chemical properties that make it useful in baking, dry mixes, and fortification applications. These properties also play into its allowable uses in regulatory frameworks around the world, where it is often listed by both its chemical name and functional designation.
How It Is Made
The production of calcium phosphate, dibasic at industrial scale typically involves controlled precipitation reactions between soluble salts of calcium and phosphate. One common route is the reaction of phosphoric acid with calcium hydroxide or calcium carbonate in aqueous suspension, followed by separation of the precipitate by filtration and controlled drying. Alternative synthesis approaches utilize calcium chloride and sodium phosphate salts to generate the calcium phosphate under defined pH and temperature conditions, after which sodium chloride by-products are removed. Following precipitation, the material is washed and dried to achieve a specified degree of hydration or anhydrous state, depending on the targeted grade for food applications. The physical properties, such as particle size distribution and crystallinity, are adjusted by milling and classification to match the functionality required in different food formats, such as fine powders for anti-caking or coarser grades for nutritional fortification. Purity and compositional specifications are defined in international compendia of food additive standards, which outline acceptable ranges for inorganic contaminants and assay levels to ensure that the finished additive is suitable for intended food uses. These specifications, developed and maintained by expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives, are integral to ensuring the quality and consistency of the additive in food formulations.
Why It Is Used In Food
Calcium phosphate, dibasic is used in food production because it delivers multifunctional technological benefits that address common formulation challenges. As an anticaking agent, it helps powdered ingredients flow freely by reducing cohesive forces between particles, which is important in dry mixes, powdered dairy products, and spices. Its role as a leavening agent or flour treatment agent complements chemical leavening systems in bakery products by interacting with other leavening components to release carbon dioxide and contribute to texture development. In addition to textural and processing benefits, calcium phosphate, dibasic also functions as a source of dietary calcium and phosphorus, which are essential minerals for human nutrition. In fortified breakfast cereals and nutritional supplements, it contributes to micronutrient content without introducing strong flavors. In emulsification and moisture retention roles, it can aid in stabilizing fat-water interfaces, improving texture and mouthfeel in processed cheese products and similar formulations. These multiple functions make it advantageous for food scientists seeking to balance physical performance with nutritional enhancement in complex food systems.
Adi Example Calculation
For illustrative purposes only, if a regulatory body establishes a tolerable intake related to phosphorus at a hypothetical figure expressed per kilogram of body weight, one could estimate the daily allowance for an individual by multiplying that value by body weight. For example, for a theoretical intake guidance of X mg of phosphorus per kilogram body weight per day, a 70 kilogram adult’s lifetime dietary intake allocation would be the product of 70 and X. It is important to understand that this calculation is only an illustrative demonstration of how intake guidance values relate to body weight and does not represent individual dietary recommendations or dietary advice.
Safety And Health Research
Regulatory authorities have reviewed calcium phosphate additives through scientific panels and expert committees to determine safety when consumed at levels consistent with intended use in foods. Evaluations by the Joint FAO/WHO Expert Committee on Food Additives have led to detailed specifications and a classification under INS number 341 (ii) for this compound, with safety assessments expressing a tolerable intake limit for phosphorus from all phosphate sources as an overall guidance measure rather than a single substance-specific acceptable daily intake. In the European Union, the safety of phosphates as a group has been reassessed by panels such as EFSA's scientific committees, which concluded that phosphates authorised as food additives are of low acute oral toxicity with no concern for genotoxicity or carcinogenicity, and the panel established a group acceptable daily intake expressed in terms of phosphorus. These evaluations consider potential exposure from all dietary sources of phosphates and inform regulatory criteria that ensure safety for the general population when used appropriately in foods.
Regulatory Status Worldwide
In the United States, calcium phosphate, dibasic is recognised within the Code of Federal Regulations as an additive that falls under general provisions for substances that are "generally recognised as safe" when used in accordance with good manufacturing practice. The listing of calcium phosphate in 21 CFR 182.1217 specifically identifies mono-, di-, and tribasic calcium phosphates as GRAS substances subject to this provision. This means that its use as a food additive is permitted without premarket approval for specific use levels, provided that it is used in a manner consistent with established food additive regulations. Other sections of the U.S. food additive regulations, such as 21 CFR 175.300 and 21 CFR 181.29, include references to calcium phosphates in contexts related to indirect food additives and preservatives, which highlight the broader regulatory recognition of phosphate salts in food contact materials and processing. Internationally, this substance is recognised in the Codex Alimentarius and JECFA specifications under INS number 341 (ii), reflecting its accepted use globally. In jurisdictions such as the European Union, calcium phosphates are assigned the E number E341, and are authorised for use in specific food categories under Regulation (EC) No 1333/2008 subject to compliance with purity criteria and good manufacturing practices.
Taste And Functional Properties
Calcium phosphate, dibasic is generally considered to have no distinct taste at low inclusion levels in food applications, which makes it suitable as a functional ingredient where sensory neutrality is essential. However, at higher levels, minerals such as calcium phosphates can impart a mild chalky or mineral sensation that can influence mouthfeel. Its physical form as a fine powder contributes to its utility as an anticaking agent, where its crystalline nature helps impede moisture-activated clumping in powdered products. In functional terms, the additive exhibits moderate insolubility in water at ambient temperatures, which ensures it remains in particulate form to exert physical effects, such as moisture-holding and free-flow properties. Its stability to heat and a wide range of pH conditions commonly encountered in food processing further enhances its versatility. These sensory and functional characteristics allow it to be incorporated into diverse formulations without adversely affecting other organoleptic attributes of the finished product.
Acceptable Daily Intake Explained
An acceptable daily intake (ADI) or tolerable intake level is a safety concept used by regulatory bodies to describe the estimated amount of a substance in food that can be consumed daily over a lifetime without appreciable health risk. For phosphate additives, expert evaluations have focused on the total intake of phosphorus from all dietary sources because phosphorus is an essential nutrient naturally present in many foods as well as added through phosphate additives. Accordingly, regulatory assessments often describe intake limits in terms of phosphorus rather than specific calcium phosphate salts, and these values incorporate conservative safety factors to account for variability in human exposure and metabolism.
Comparison With Similar Additives
Calcium phosphate, dibasic can be compared with other food additive phosphates such as monocalcium phosphate and tricalcium phosphate. Monocalcium phosphate, listed in many regulatory systems, functions primarily as a leavening acid in baking applications with higher solubility and more reactive acid-base behavior compared with dibasic calcium phosphate. Tricalcium phosphate is often used as an anticaking agent in powdered spices and dry products due to its physical free-flow properties and relatively inert chemical nature. While all calcium phosphates contribute calcium and phosphate ions, their functional profiles differ based on solubility and chemical stoichiometry, influencing how food technologists select one form over another for specific textural or nutritional objectives.
Common Food Applications Narrative
Calcium phosphate, dibasic appears across a wide array of food categories because it addresses both technological and nutritional objectives in formulations. In cereal products, it can serve to fortify with essential minerals while also helping maintain the flow properties of dry ingredients during manufacturing and packaging. In bakery products and mixes, its flour treatment and leavening roles contribute to consistent dough performance and baked texture. Powdered dairy products, nutritional supplements, and ready-to-mix beverages benefit from its ability to act as a free-flow agent and stabilizer, helping ensure uniform dispersion of components and reduced clumping. In cheese analogs and processed cheese products, it contributes to emulsification and moisture control, enabling smoother texture and improved shelf stability. Calcium phosphate, dibasic also finds use in dry seasoning blends and spice mixes where it helps maintain particulate separation and prevents caking caused by fluctuations in humidity during storage. Across all of these applications, its combined roles as an anticaking agent, nutrient source, and processing aid make it a valuable additive for manufacturers seeking to deliver consistent quality to consumers.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 182.1217
EFSA
- Approved: True
- E Number: E341
- Adi Display: 40 mg/kg bw per day expressed as phosphorus
- Adi Mg Per Kg: 40
JECFA
- Year: 1982
- Ins Number: 341(ii)
- Adi Display: tolerable intake 70 mg/kg bw expressed as phosphorus
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