Ferric pyrophosphate
[CAS# 10058-44-3]

Identification

• Classification: Inorganic chemical industry >> Inorganic salt >> Phosphides, metal phosphoric acid, metaphosphoric acid, hypophosphorous acid and pyrophosphate
• Name: Ferric pyrophosphate
• Synonyms: Iron (III) pyrophosphate; Diphosphoric acid iron(III) salt
• Molecular Formula: Fe₄^.(P₂O₇)₃
• Molecular Weight: 745.21
• CAS Registry Number: 10058-44-3
• EC Number: 233-190-0
• SMILES: [O-]P(=O)([O-])OP(=O)([O-])[O-].[O-]P(=O)([O-])OP(=O)([O-])[O-].[O-]P(=O)([O-])OP(=O)([O-])[O-].[Fe+3].[Fe+3].[Fe+3].[Fe+3]

Safety Data

• Hazard Symbols: GHS07 Warning
• Hazard Statements: H302-H315-H319-H335
• Precautionary Statements: P261-P305+P351+P338

Discovory and Applicatios

Ferric pyrophosphate (Fe4(P2O7)3) was first synthesized in the early 20th century by chemists exploring the properties of pyrophosphate compounds. Derived from ferric (iron) and pyrophosphate ions, this compound emerged from research aimed at developing stable, bioavailable iron sources. Its synthesis involved combining ferric chloride with sodium pyrophosphate, resulting in a compound that displayed a fine balance between solubility and stability. This discovery opened new avenues for its use as an iron fortification agent, addressing issues related to iron deficiency in various populations.

Ferric pyrophosphate is widely used in food fortification to combat iron deficiency anemia. Its favorable organoleptic properties, such as being tasteless and less reactive with food components, make it ideal for enriching staple foods like flour, cereals, and dairy products. Unlike other iron compounds, it does not alter the taste or color of fortified foods, making it suitable for a broad range of applications. Its bioavailability is enhanced in the presence of vitamin C or other organic acids, ensuring effective iron supplementation.

In dietary supplements, ferric pyrophosphate provides a form of iron that is well-tolerated and effective. It is often used in multivitamin and mineral formulations to address iron deficiency without causing gastrointestinal side effects commonly associated with other iron salts. This makes it a preferred choice for individuals with sensitive digestive systems, such as pregnant women and those with chronic conditions requiring iron supplementation. Its slow-release formulation further aids in sustained absorption, improving iron levels over time.

Ferric pyrophosphate is employed in medical and pharmaceutical settings as an iron source in parenteral nutrition and oral iron therapy. In parenteral nutrition, it provides a stable iron source for patients unable to receive oral iron, such as those with severe gastrointestinal disorders or undergoing chemotherapy. In oral iron therapy, it is included in formulations designed to deliver iron in a controlled manner, enhancing patient compliance and minimizing side effects. Its use in intravenous iron preparations also helps manage anemia in chronic kidney disease patients.

Beyond nutrition, ferric pyrophosphate has applications in various industrial processes. It serves as a catalyst in certain chemical reactions, particularly in the synthesis of organic compounds and in the production of ferric chloride for water treatment. Its role in water treatment involves precipitating phosphates and removing heavy metals, contributing to the purification and management of industrial wastewater. Additionally, it is used in the manufacture of specialty pigments and coatings, where its stability and reactivity are beneficial for producing high-quality products.

In agriculture, ferric pyrophosphate acts as a micronutrient in fertilizers to correct iron deficiencies in crops. It helps improve chlorophyll synthesis and plant respiration, essential for healthy growth and development. Its slow-release properties ensure a steady supply of iron to plants, enhancing nutrient uptake and reducing the risk of toxicity associated with other iron compounds. This contributes to improved crop yields and quality, supporting sustainable agricultural practices.