MANGANESE CITRATE
**Manganese citrate** (CAS 10024-66-5) is a chelated manganese compound used in food as a nutrient supplement and sequestering agent. It is affirmed as GRAS in the United States under direct food substance regulations and functions primarily to supply manganese, an essential trace element, to fortified foods and beverages.
What It Is
Manganese citrate is a coordination compound formed from manganese and citric acid and functions as a nutrient supplement and sequestering agent in foods. At the molecular level, manganese citrate consists of manganese(II) ions chelated by citrate ligands derived from citric acid, forming a stable complex recognized under CAS Registry Number 10024-66-5. This compound is utilized technologically in food processing to contribute manganese, an essential trace element that is involved in numerous biological processes. In regulatory inventories, manganese citrate appears under specific listings that affirm its use with good manufacturing practice conditions in various food categories. While not assigned an E number in the European Union food additive list, it is regulated in the United States under Title 21 of the Code of Federal Regulations, section 184.1449, where it is affirmed as generally recognized as safe when used according to current good manufacturing practice. Manganese citrate is typically encountered as a pale orange to pinkish white powder that dissolves in water under the presence of sodium citrate, forming chelated manganese species that can interact with other formulation components. The term "nutrient supplement" reflects its principal role of supplying manganese in fortified foods, whereas the function as a sequestering agent relates to its ability to bind metal ions in complex food matrices, potentially influencing mineral availability and stability of food components. In dietary context, manganese citrate is not used for flavor or color but rather to support the inclusion of trace minerals in food products where natural manganese content may be insufficient. This aligns with its classification in direct food substance inventories such as the FDA’s Substances Added to Food database, which categorizes it based on its technical effect on food quality and nutrient content. Although the compound itself does not impart significant sensory character to food, its contribution to trace mineral nutrition is central to its inclusion in fortified products. Manganese citrate’s chelating properties can also influence the stability of other ingredients in complex formulations, adding a functional utility beyond pure nutrient supply.
How It Is Made
The manufacturing of manganese citrate involves controlled chemical reactions that combine a manganese source with citric acid under conditions that promote chelation and formation of the citrate complex. Typically, the process begins with a soluble manganese salt such as manganese sulfate, which is reacted with sodium carbonate to precipitate manganese carbonate. The precipitate is filtered and washed to remove soluble impurities, and then it undergoes further processing to generate the chelated manganese citrate complex. In practice, the manganese carbonate precipitate is first hydrolyzed with a sufficient citric acid solution to form manganous citrate, and this intermediate is then reacted further with sodium citrate to complete the formation of the citrate salt. This staged addition and reaction sequence help ensure the consistent formation of the manganese citrate complex with the intended chemical structure and functional properties. The resultant product is typically a pale orange or pinkish white powder with a composition and purity suitable for its intended use in foods and supplements. The manufacturing process emphasizes control of reaction conditions, purification, and drying to yield a stable compound that meets quality standards for food ingredient use. Because the compound will be introduced into human food, the process is executed with an emphasis on current good manufacturing practices to minimize contaminants and ensure a consistent product. Regulatory specifications for the ingredient, such as those outlined by the Food and Drug Administration in the United States under 21 CFR 184.1449, require that the ingredient be of a purity suitable for its intended use. These regulatory frameworks guide manufacturers to adhere to documented procedures that produce manganese citrate with acceptable characteristics, including particle size, residual reagent levels, and absence of harmful impurities. Manufacturing quality controls often include analytical testing to verify manganese content, chelate formation, and absence of contaminants. These tests may involve techniques such as spectroscopy for metal content analysis and chromatographic methods to confirm the integrity of the citrate complex. The emphasis on manufacturing controls and quality verification reflects the dual role of the compound as both a nutrient supplement and a chemical additive, ensuring that it performs its technical functions without introducing unintended risks.
Why It Is Used In Food
Manganese citrate is used in food primarily to supply manganese, an essential trace mineral, and to act as a sequestering agent that can bind metal ions within complex food matrices. As a nutrient supplement, it allows food manufacturers to fortify products with manganese in a form that is bioavailable and compatible with a variety of food systems. Manganese plays a role in normal physiological processes in humans, and when natural dietary sources may not provide adequate amounts, fortified foods can help bridge gaps in intake. The citrate form offers a soluble, chelated manganese source that can be incorporated into beverages, bakery products, dairy analogs, and other fortified foods without significantly altering taste or appearance. In addition to nutritional supplementation, manganese citrate can function as a sequestering agent in formulation. Sequestering agents are compounds that bind divalent metal ions, which can help stabilize food components, prevent undesirable interactions, and maintain product quality during processing and storage. For example, by chelating metal ions that might otherwise catalyze oxidation or interact with other ingredients, manganese citrate can contribute to the physical and chemical stability of certain food systems. Although its sequestering capacity is secondary to its nutritional role, this functional versatility has utility in complex formulations where metal ion interactions could affect texture, color, or shelf life. The inclusion of manganese citrate in food products aligns with regulatory recognition that it is safe when used according to current good manufacturing practice. It allows formulators to address specific nutritional goals, such as enhancing the trace mineral profile of a product, while also providing functional benefits related to formulation stability. Regulatory listings such as those found in direct food substance inventories help guide manufacturers on appropriate use conditions without imposing rigid quantitative limits, instead relying on good manufacturing practice to ensure safe and effective application of the ingredient.
Adi Example Calculation
Illustrative calculation of total manganese intake helps demonstrate how acceptable intake concepts translate to real-world scenarios. For example, consider an adult consumer with a total daily manganese intake target derived from scientific opinions on safe levels of intake for manganese. Suppose a conservative safe intake level for total manganese from all dietary sources is estimated at 8 mg per day for an adult. If a fortified beverage provides 1 mg of manganese from manganese citrate per serving, this represents 12.5% of the total safe intake for that day. In this illustration, consuming one serving of the fortified beverage contributes a modest fraction of the overall manganese intake, leaving headroom for manganese from naturally occurring food sources. When designing fortified products, formulators consider such illustrative calculations to ensure that manganese contributions from added sources do not raise total intake above guidance levels established by scientific bodies. It is important to emphasise that this example is illustrative and not a recommendation for individual intake. Total daily manganese intake includes contributions from naturally manganese-rich foods such as whole grains, nuts, leafy vegetables, and tea, as well as fortified products and supplements. The illustrative calculation highlights how manganese citrate’s contribution can be contextualised within total dietary exposure. Safety assessments account for variability in individual diets, body weights, and absorption rates, and they incorporate conservative safety factors to address uncertainties in data. This approach helps ensure that fortified products remain within guidance values for total manganese intake when consumed as part of a varied diet.
Safety And Health Research
Safety and health research related to manganese citrate focuses on manganese as an essential nutrient and the potential effects of excessive intake rather than on specific toxicology of the citrate salt itself. Manganese is recognised as an essential trace element required for normal biological functions, including enzyme activation, bone formation, and metabolism. Regulatory bodies and scientific panels have examined manganese intake to identify levels that can be tolerated without adverse effects. For instance, the European Food Safety Authority has conducted systematic reviews addressing the tolerable upper intake level for manganese, noting that evidence for critical intake thresholds is limited and that excessive manganese exposure can be associated with neurotoxicity. Scientific opinions have outlined “safe levels of intake” for total manganese consumption from all dietary sources to provide context for risk assessment. These opinions emphasise that neurotoxicity is a key concern at high dietary exposures, and data gaps remain in identifying precise dose-response relationships that could define tolerable upper limits. In regulatory evaluations, the focus is typically on total manganese exposure rather than on specific manganese salts like manganese citrate. This is because dissociable manganese compounds in the gastrointestinal tract will release manganese ions that contribute to overall manganese bioavailability and systemic exposure. Accordingly, safety considerations revolve around the aggregate intake of manganese from food, water, supplements, and fortified foods. Research on manganese metabolism highlights that the body tightly regulates manganese absorption and excretion, but excessive intake, particularly in susceptible populations, can lead to accumulation in tissues. While manganese citrate itself has not been associated with unique toxicological profiles separate from manganese ion exposure, regulators consider the form and solubility of manganese compounds when assessing bioavailability and potential exposure risks. Toxicological studies in animals and humans have explored manganese’s effects on neurological endpoints at high exposure levels, and scientific panels have called for more data to refine intake guidelines. In summary, safety and health research related to manganese citrate encompasses manganese’s essential role and the balance between sufficient and excessive intake. Regulatory evaluations and scientific opinions provide context for manganese exposure, emphasising that safety assessments must consider total intake and potential risks associated with elevated manganese levels.
Regulatory Status Worldwide
Manganese citrate is regulated and affirmed for use as a direct food substance in the United States, with corresponding safety conditions that guide its application in food products. Under Title 21 of the Code of Federal Regulations, section 184.1449, manganese citrate (CAS 10024-66-5) is listed among direct food substances affirmed as generally recognized as safe (GRAS) when used in accordance with current good manufacturing practice. This regulation describes the ingredient’s physical form, production process, and intended conditions of use, including its application as a nutrient supplement in specified food categories. The regulatory text also notes that the ingredient may be used in infant formulas under provisions in the Federal Food, Drug, and Cosmetic Act, indicating pathways for its inclusion in specialized products when appropriate manufacturing practices are followed. The listing under 21 CFR 184.1449 underscores that manganese citrate has been evaluated by the U.S. Food and Drug Administration for safety in the context of food use and that its technical functions and use conditions are documented in regulatory frameworks. Outside the United States, manganese citrate does not currently have a defined E number in the European Union’s Union List of authorised food additives under Regulation (EC) No 1333/2008. Additives permitted in the EU must appear on this list with specific conditions of use, and the absence of manganese citrate from that list indicates that it is not recognised as an authorised additive in that system at present. However, manganese and its compounds are subject to evaluation by food safety authorities for dietary exposure and safe levels of intake, even when not listed as specific additives. For example, the European Food Safety Authority has provided scientific opinions on tolerable upper intake levels for manganese as a nutrient, reflecting a broader assessment of manganese exposure from all dietary sources. In the context of food ingredient regulation, manganese citrate’s approval status varies by jurisdiction and depends on whether regulatory authorities have assessed and authorised its specific use as a food additive or nutrient source.
Taste And Functional Properties
Manganese citrate itself does not impart a distinct flavor but can influence the sensory and functional properties of food products through its chemical behavior and interactions with other ingredients. In terms of taste, manganese citrate is generally used at low concentrations in fortified foods, where its presence is engineered to supply manganese rather than to contribute a flavor note. As a chelated mineral compound, it is typically neutral or mildly acidic in character, and its inclusion is formulated so that it does not create detectable off-flavors in finished products. This characteristic makes it suitable for a wide range of applications where sensory neutrality is desired, such as in beverages, baked goods, and dairy analogs. Functionally, manganese citrate exhibits properties associated with chelating metal ions in solution. Chelation refers to the formation of stable complexes between a metal ion and an organic ligand, such as citrate. In food matrices, free metal ions can sometimes catalyze oxidative reactions or form complexes with other components, potentially affecting texture, color, or shelf life. By chelating metal ions, manganese citrate can help moderate these interactions, contributing to the overall stability of the product. This sequestering function does not typically influence the taste directly but can improve the perceivable quality of food by preventing unwanted changes that might otherwise occur during processing or storage. Manganese citrate is also soluble in aqueous environments in the presence of citrate, allowing it to distribute evenly in beverage systems and liquid fortified foods. Its solubility and chelating properties make it compatible with a broad pH range encountered in different product types. Because manganese citrate is included primarily for its technical functions rather than for flavor impact, formulators often balance its use with other ingredients to maintain the desired sensory profile. The fact that the compound does not introduce strong sensory notes at typical use levels contributes to its suitability across diverse product categories, from nonalcoholic beverages to baked goods and dairy alternatives.
Acceptable Daily Intake Explained
Acceptable daily intake (ADI) frameworks provide a conceptual approach to understanding safe levels of nutrient and additive intake, and they emphasise safety margins and conservative assessments. An ADI generally refers to the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on toxicological and exposure data. For food additives and nutrient sources like manganese compounds, regulators consider available evidence on effects, bioavailability, and potential adverse outcomes when establishing such guidance values. In the case of manganese, scientific committees have reviewed data on intake and neurotoxicity, noting that evidence is insufficient to identify clear dose-response thresholds for adverse effects. As a result, some authorities have expressed intake guidance in terms of “safe levels” rather than formal ADIs, reflecting the complexity of manganese metabolism and the challenge of isolating intake-response relationships. Regulatory assessments typically integrate safety factors that account for uncertainties in data, differences between individuals, and potential vulnerable subgroups. These safety factors help ensure that guidance values remain protective when there is limited direct evidence for specific intake thresholds. In practical terms, the ADI concept for nutrients emphasises that intake from additives, fortified foods, natural sources, and supplements should be considered collectively. Because manganese is ubiquitous in many foods, regulators focus on total dietary exposure rather than solely on intake from fortified products. The ADI framework encourages conservative approaches that prioritise safety, particularly when data gaps exist or when the compound contributes to overall exposure without clear benefit at high intake levels. In summary, acceptable daily intake concepts underscore the need for careful evaluation of both essential nutrient requirements and potential risks associated with excessive intake. For manganese citrate, safety guidance revolves around manganese as a nutrient, with scientific opinions providing context for safe levels of intake while recognising uncertainties and emphasising protective approaches.
Comparison With Similar Additives
Manganese citrate can be compared with other mineral chelate additives that serve similar nutritional or functional roles in food formulation. Mineral chelates such as zinc citrate, magnesium citrate, and iron pyrophosphate are commonly used to supply essential minerals in fortified foods and supplements. Like manganese citrate, these compounds combine a mineral ion with an organic ligand to enhance solubility, stability, and bioavailability. For example, zinc citrate serves as a source of dietary zinc and is often chosen for its solubility in aqueous systems, making it suitable for inclusion in fortified beverages. Similarly, magnesium citrate is used to provide magnesium in supplements and fortified products, offering a balance between solubility and elemental content. One practical distinction among these mineral chelates lies in the bioavailability of the mineral ion and its influence on sensory properties. Some mineral salts, such as iron sulfate, may introduce metallic tastes at certain concentrations, whereas citrate forms tend to have milder sensory impacts due to their chelating structure. Manganese citrate, therefore, shares a functional characteristic with other citrate chelates in minimising sensory interference while delivering a trace mineral. In terms of regulatory context, each mineral chelate is assessed independently based on safety data, intended use levels, and nutritional considerations. While manganese citrate’s regulatory status is affirmed in specific jurisdictions like the United States under current good manufacturing practice conditions, other mineral chelates may have distinct authorisation pathways and usage conditions depending on the jurisdiction. Comparative analysis of mineral chelates emphasises that formulation decisions often balance nutritional goals, sensory considerations, and regulatory compliance. By selecting an appropriate chelate form for a given mineral, food manufacturers can achieve desired fortification outcomes while maintaining product quality and meeting safety guidelines.
Common Food Applications Narrative
Manganese citrate finds application in a variety of fortified food and beverage products where trace mineral enrichment is desired. In modern food formulation, manganese citrate is selected for products designed to deliver additional nutritional value beyond natural content, particularly with respect to essential trace minerals. For example, manufacturers may include manganese citrate in fortified breakfast cereals, nutrition bars, or enhanced beverages to address consumer demand for products with added mineral content. Because it supplies manganese in a form that integrates readily into aqueous and dry food systems, manganese citrate can be used to support fortification strategies without compromising the sensory quality of the final product. In bakery products such as breads, muffins, and nutrition-focused snacks, manganese citrate’s inclusion helps contribute to a balanced micronutrient profile. These products often serve as vehicles for fortification, where manganese citrate can be integrated alongside other vitamins and minerals to create an enhanced nutritional offering. Because manganese citrate does not introduce off-flavors, formulators can include it at levels that meaningfully contribute to daily manganese intake targets without affecting taste or texture. In beverage applications, especially those oriented toward health and wellness, manganese citrate can be dissolved in fruit-flavored drinks, sports beverages, and fortified waters. Its chelated form ensures that manganese remains soluble and stable in solution, providing nutritional value while maintaining clarity and mouthfeel. Dairy and dairy analogs such as fortified plant-based milks, yogurts, and nutritional shakes also benefit from the inclusion of manganese citrate. In these products, manganese citrate supports nutritional labeling claims and helps meet consumer expectations for micronutrient fortification. Because these products often target consumers seeking balanced nutrition, the incorporation of trace minerals like manganese contributes to overall product positioning. Manganese citrate may also be used in formulations for meal replacement shakes and powdered nutrition mixes, where it can be blended with other ingredients to deliver a complete nutrient profile. Across these diverse applications, formulators rely on manganese citrate both for its nutritional contribution and its compatibility with complex ingredient systems. Its role in fortified foods reflects broader trends in functional nutrition, where consumers seek products that provide added value in terms of essential micronutrients. By enabling manganese fortification without sensory compromise, manganese citrate supports the development of food products that address nutritional gaps and appeal to health-conscious consumers.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 184.1449
EFSA
- Notes: Manganese citrate is not listed as a permitted additive with an E number in the EU additive database.
JECFA
- Notes: No specific JECFA additive entry for manganese citrate found in the JECFA database; general manganese evaluations exist.
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