Ferric Sodium EDTA Encyclopedia — Scientific Background

What Is Ferric Sodium EDTA?

Ferric sodium EDTA (NaFeEDTA) is an iron chelate resulting from the deprotonation of all four carboxy groups of ethylenediaminetetraacetic acid and the addition of an iron(III) ion and a sodium ion. It is chemically characterized by the molecular formula C₁₀H₁₂FeN₂NaO₈, with a molecular weight of 367.05 g/mol (anhydrous form). The compound exists as an anhydrous form (CAS 15708-41-5) and a trihydrate form (CAS 18154-32-0), with a formula weight of 421.09 for the trihydrate. Ferric sodium EDTA is a white to off-white solid with purity grades typically ≥99%.

The EDTA Chelation Advantage

The chelation of iron with EDTA is the key feature that distinguishes ferric sodium EDTA from conventional iron salts. This chelation provides three critical benefits:

• Protection from Dietary Inhibitors — The EDTA molecule shields iron from phytates and polyphenols, which are potent inhibitors of iron absorption found in cereals, legumes, and other plant foods. NaFeEDTA enhances iron absorption in the presence of phytate.

• Stability Across Food Matrices — NaFeEDTA remains stable in various food matrices, including soy sauce and fish sauce, for periods of up to 1 year without adverse alterations.

• Improved Sensory Profile — The compound is virtually tasteless and odourless, making it ideal for food fortification applications.

Physiological Functions of Iron

Iron is an essential trace mineral required for numerous physiological processes:

• Hemoglobin Synthesis — Iron is the central atom in the heme group of hemoglobin, enabling oxygen transport from the lungs to tissues

• Oxygen Transport — Iron-containing myoglobin facilitates oxygen storage and transport in muscle tissue

• Electron Transfer — Iron-sulfur clusters and heme groups participate in mitochondrial electron transport chain reactions

• Enzymatic Reactions — Iron is a cofactor for numerous enzymes involved in DNA synthesis, neurotransmitter production, and immune function

• Energy Metabolism — Iron-containing cytochromes are essential for ATP production

Absorption Mechanism

The absorption of iron from ferric sodium EDTA is regulated through the same physiological mechanisms as other forms of iron. The EDTA chelate protects iron from dietary inhibitors, allowing for efficient absorption even in high-phytate food matrices. liposomal encapsulation further enhances absorption by protecting the iron-chelate complex during digestive transit and facilitating cellular delivery via lipid-mediated pathways. liposomes are absorbed through the intestinal mucosa, and iron is released by liver enzymes, providing high gastrointestinal absorption and bioavailability.

Clinical Evidence

Iron Fortification Efficacy

Ferric sodium EDTA is recommended as a fortificant for cereals and cereal-based products, including pixtamalised corn flour. Studies have demonstrated that an equal mixture of FeSO₄ and NaFeEDTA can be an effective strategy to ensure adequate iron absorption from phytate-containing complementary foods for young children.

Bioavailability and Safety

A randomized controlled trial compared ferric sodium EDTA in combination with vitamin C, folic acid, copper gluconate, zinc gluconate, and selenomethionine as a therapeutic option for chronic kidney disease patients, demonstrating improvement in inflammatory status. Treatment with ferric sodium EDTA combination and/or ferric liposomal formulation was safe and well-tolerated.

Regulatory Approvals

Ferric sodium EDTA has received approval from major regulatory authorities, including the WHO, FDA, and EFSA, as an iron source with elevated bioavailability and a good safety profile. The WHO/JECFA concluded that sodium iron EDTA is suitable for use as a source of iron for food fortification and is considered safe when used in supervised food fortification programmes.

Liposomal Ferric Sodium EDTA

Liposomal encapsulation of ferric sodium EDTA provides an additional layer of protection and delivery enhancement beyond the chelation itself. The phospholipid bilayer surrounds the iron-chelate complex, forming a shield that protects it from gastric acid and prevents premature reactions with food components.

The liposomal delivery system enhances the bioavailability of iron in the human body compared with conventional forms. Liposomes are absorbed through the intestinal mucosa, and iron is released by liver enzymes, providing high gastrointestinal absorption and bioavailability. This delivery system also minimizes direct contact between iron and the gastrointestinal mucosa, reducing the risk of gastrointestinal discomfort.

Safety and Regulatory

Ferric sodium EDTA has a low acute toxicity, with an oral LD₅₀ value of 10,000 mg/kg body weight in rats, corresponding to approximately 1,326 mg iron/kg body weight. The WHO/JECFA has concluded that sodium iron EDTA is considered safe when used in supervised food fortification programmes. A provisional maximum tolerable daily intake of 0.8 mg/kg body weight was established for iron.

In the European Union, ferric sodium EDTA is authorized as a novel food ingredient used as a source of iron. In China, GB 1903.72-2025 (National Food Safety Standard — Food Nutritional Fortification Substance — Sodium Iron EDTA) was published in March 2025. In the United States, ferric sodium EDTA is not currently recognized by the FDA as a direct food additive. Formulators should verify local regulatory requirements prior to market entry. Testing protocols must adhere to international standards including USP, European Pharmacopoeia, and FAO/WHO Codex Alimentarius.

This product is intended for research, nutraceutical, and functional food applications. Not intended to diagnose, treat, cure, or prevent any disease.

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