SODIUM FERRICITROPYROPHOSPHATE
Sodium ferricitropyrophosphate (CAS 1332-96-3) is an iron-containing compound used as a nutrient supplement type additive, functioning primarily as an iron source in fortified foods. It appears as a white to brownish powder and supplies iron in a form compatible with food formulations.
What It Is
Sodium ferricitropyrophosphate is a complex inorganic iron salt used as a nutrient supplement in food products. It has the CAS Registry Number 1332-96-3 and goes by several other names including iron(III) pyrophosphate and soluble ferric pyrophosphate, reflecting its chemical identity as an iron-containing pyrophosphate complex. As a nutrient supplement additive, it provides iron, an essential mineral, in food applications where enhanced iron content is desired. Iron is a critical micronutrient in human nutrition, and compounds like sodium ferricitropyrophosphate serve to increase iron levels in fortified foods without significantly altering flavor profiles. In terms of appearance, sodium ferricitropyrophosphate typically presents as a white to brownish powder or soluble crystalline substance. The iron in this compound is in the ferric (Fe(III) oxidation state, and the compound’s structure is built around pyrophosphate and associated ligands that help stabilize the iron in a food-compatible form. The term "nutrient supplement" reflects its primary technological function in food: to act as a source of a dietary mineral rather than to alter physical properties like texture or color. This ingredient is used in regulated food systems where fortification with iron is permitted or encouraged, such as in table salt, cereals, flours, and other staple foods. The purpose is to help address iron deficiency, which is a common micronutrient gap in many populations. Because it is formulated to release iron in the digestive tract, it must balance bioavailability with stability within food matrices.
How It Is Made
The production of sodium ferricitropyrophosphate typically involves controlled chemical reactions between iron salts and pyrophosphate precursors. In industry, pyrophosphate compounds such as sodium pyrophosphate react with iron(III) sources under specific pH and temperature conditions to form the ferric pyrophosphate complex. The reaction conditions are adjusted so that the final product has acceptable purity and is suitable for food-grade use, meeting required specifications for identity, composition, and absence of harmful contaminants. Manufacturers handle the process with attention to regulatory food-grade material standards, which include limits on heavy metals and other impurities. After synthesis, the product is often purified, dried, and milled into a powder or crystalline form that can be easily handled in food production. Quality control testing typically verifies particle size, iron content, and absence of undesirable byproducts. Because the compound is used for nutrient supplementation rather than flavoring or preservation, its purity and stability under storage conditions are especially important. Although detailed proprietary methods for commercial production vary across producers, the general principle is to combine a ferric iron source with a pyrophosphate ligand in a way that yields a stable nutrient supplement. The exact manufacturing steps are usually documented in technical specifications submitted to regulators or included in food additive compendia that list identity and purity requirements.
Why It Is Used In Food
Sodium ferricitropyrophosphate is incorporated into food products primarily to increase dietary iron content. Iron is a vital nutrient needed for oxygen transport, energy metabolism, and overall physiological function. Food fortification with iron helps address common nutritional deficiencies in populations where dietary intake might otherwise fall short. The technological rationale for using this specific compound is that it provides a stable source of iron that is compatible with various food matrices and processing conditions. Unlike some iron salts that can cause unpleasant sensory changes (such as metallic taste or discoloration), sodium ferricitropyrophosphate is formulated to minimize these effects while delivering an effective amount of iron. It can be blended into dry mixes, fortified salts, and cereal products without overly impacting taste, color, or texture. Manufacturers select nutrient supplements like this based on their solubility characteristics, stability during processing, and ability to provide a sufficient level of the nutrient in the final product. In addition to addressing nutritional needs, its inclusion in fortified foods must align with regulatory frameworks that govern nutrient levels and permissible ingredients. Such frameworks evaluate safety, technological need, and consistency with dietary guidelines. By choosing an iron supplement form that works well in food systems, producers can formulate products that help consumers meet recommended intakes of essential minerals without compromising product quality.
Adi Example Calculation
As an illustrative concept, if a nutrient supplement were evaluated and a numeric ADI were established for iron content from a fortified ingredient, a simple calculation might show how much iron an individual could safely consume relative to body weight. For example, using a hypothetical ADI expressed per kilogram of body weight, one could multiply that number by a representative body weight to estimate total allowable intake. It is important to note that this is purely illustrative; specific numeric ADI values for sodium ferricitropyrophosphate itself were not identified in the d authoritative sources. Therefore, detailed numeric examples are not provided.
Safety And Health Research
The safety evaluation of sodium ferricitropyrophosphate and related iron nutrient supplements involves examination of both chemical toxicity and iron bioavailability. Regulatory authorities review data from toxicological studies focusing on endpoints such as potential for genotoxicity, effects on organ systems, and overall systemic tolerance. Iron in mineral form is an essential nutrient, but regulators also consider the potential for excess iron intake, which can cause adverse effects if significantly above typical dietary levels. Studies often examine how iron compounds behave in biological systems, including digestive absorption, interaction with other dietary components, and long-term outcomes in animal models. Because iron overload can occur at high intake levels, safety assessments emphasize appropriate use levels in foods and adherence to good manufacturing practices. Evidence supporting the safe use of ferric pyrophosphate-related compounds has included evaluations where they are affirmed as generally recognized as safe for nutrient supplementation when used within established practices. Detailed toxicological evaluations specific to sodium ferricitropyrophosphate as CAS 1332-96-3 were not identified in the d authoritative sources, so cautionary wording around specific study data is maintained.
Regulatory Status Worldwide
Regulatory frameworks that govern food additives vary by jurisdiction, and sodium ferricitropyrophosphate’s status must be understood within those frameworks. In the United States, closely related ferric pyrophosphate forms appear in regulations as direct food substances that can be affirmed as generally recognized as safe (GRAS) for use as nutrient supplements, with specifications incorporated by reference in Title 21 of the Code of Federal Regulations. As an example, ferric pyrophosphate (a related iron compound) is described under 21 CFR 184.1304 as a nutrient supplement with no specific limitations other than good manufacturing practice. However, the CFR entry for specifically CAS 1332-96-3 in that context was not found, so direct approval of this exact CAS entry is treated as null here and explained in notes. Internationally, bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) prepare specifications and evaluations for food additives, which include procedures for defining identity and purity. While a direct JECFA specification entry for sodium ferricitropyrophosphate was not identified, the ingredient falls within broader discussions of mineral fortification agents managed by expert committees. Regulatory acceptance in other regions depends on local food additive lists and fortification standards that often recognize iron-containing nutrients as permitted within defined use levels.
Taste And Functional Properties
Sodium ferricitropyrophosphate generally exhibits limited impact on the sensory characteristics of foods when used appropriately. As a mineral nutrient source, it does not impart strong flavor notes, and its contribution to taste is minimal compared with the primary food ingredients. This makes it suitable for fortifying products where preserving the original sensory profile is important, such as in staple foods or beverages formulated for mass consumption. Functionally, the compound’s solubility and stability are key considerations. It is formulated so that iron remains chemically bound until digestion, providing bioavailable iron without promoting oxidation in foods. The stability of iron in this form helps prevent undesirable reactions that might compromise texture or color, particularly in products with long shelf lives. Because it does not act as a preservative or emulsifier, its functional role is primarily nutritional rather than structural. The form of sodium ferricitropyrophosphate used in foods is chosen to balance the need for iron release during digestion with the need to remain chemically compatible with food processing conditions such as heat, pH changes, and storage. Sensitive use levels and appropriate formulation practices help ensure that it contributes beneficially to iron intake without causing off-notes or quality issues in fortified foods.
Acceptable Daily Intake Explained
The concept of an acceptable daily intake (ADI) refers to the estimated amount of a substance that can be consumed every day over a lifetime without appreciable health risk, based on scientific evaluations. For nutrient supplements like sodium ferricitropyrophosphate, ADI considerations intersect with the nutritional requirement for iron and potential upper intake limits established for iron by nutrition science bodies. Regulatory bodies may establish ADIs or tolerable intake levels for additives or nutrients based on toxicological and nutritional evidence. In the specific case of sodium ferricitropyrophosphate, authoritative sources did not explicitly list an ADI for this compound, so numeric values are not included here. Instead, ADI determinations for iron generally consider the total dietary iron from all sources and set safe upper intake levels that account for iron’s essential role and potential for toxicity at very high levels. The principle of an ADI emphasizes that nutrient supplementation should be balanced with overall dietary intake to support health without exceeding amounts that could pose risks.
Comparison With Similar Additives
Sodium ferricitropyrophosphate can be compared with other iron-containing nutrient supplements such as ferrous sulfate, ferric orthophosphate, and ferric pyrophosphate forms. Ferrous sulfate is a commonly used iron salt with high bioavailability but can impart stronger sensory changes in food products and may be more reactive chemically. Ferric orthophosphate is another iron compound used for fortification with generally low impact on food sensory qualities. Ferric pyrophosphate, which has regulatory entries in some systems, is similar chemically to sodium ferricitropyrophosphate but differs in exact formulation and solubility. These nutrient supplements share the goal of increasing iron content in fortified foods but vary in solubility, stability, and potential sensory interaction. Developers choose specific forms based on factors such as compatibility with food matrices, processing conditions, and regulatory acceptance in target markets. Such comparative considerations help food formulators match the technical and nutritional needs of products with consumer expectations and regulatory requirements.
Common Food Applications Narrative
Sodium ferricitropyrophosphate finds its place in a variety of fortified food products where iron supplementation is desirable. In many countries, essential staple foods such as table salt, breakfast cereals, flours, and grain products are fortified with iron to help address public health goals related to micronutrient deficiencies. By adding a nutrient supplement like sodium ferricitropyrophosphate, food producers can increase the iron content of these products without significantly altering their taste or appearance. For example, fortified table salt is a common vehicle for adding essential vitamins and minerals because salt is widely consumed across populations. When combined with iron as a nutrient supplement, such fortified salts help deliver micronutrients consistently through daily diets. Similarly, in breakfast cereals and grain mixes, iron supplementation supports dietary recommendations and can help reduce the risk of iron deficiency anemia, especially in vulnerable groups. The inclusion of this compound is carefully formulated so that it integrates with the food matrix and withstands typical processing steps. Overall, sodium ferricitropyrophosphate serves an important role in public health nutrition strategies that rely on food fortification. It is selected for products where the delivery of a stable iron source can help meet dietary needs without negatively impacting the consumer experience. The food categories in which it appears are diverse but unified by the objective of enhancing nutrient intake in a broad consumer base.
Safety & Regulations
FDA
- Notes: Specific CFR approval for CAS 1332-96-3 sodium ferricitropyrophosphate was not found in the d FDA regulations; related ferric pyrophosphate provisions exist under 21 CFR 184.1304 but refer to CAS 10058-44-3, not this exact CAS.
EFSA
- Notes: No specific EFSA additive entry or numeric ADI for this ingredient in authoritative sources was identified.
JECFA
- Notes: No specific JECFA additive specification or numeric ADI for this ingredient was identified in the available authoritative databases.
Comments
Please login to leave a comment.
No comments yet. Be the first to share!