SODIUM STEARYL FUMARATE

CAS: 4070-80-8 DOUGH STRENGTHENER, LEAVENING AGENT, LUBRICANT OR RELEASE AGENT

Sodium stearyl fumarate is a white crystalline sodium salt of stearyl fumaric acid that functions in food systems as a dough conditioner and technical processing agent. It also serves as a lubricant or release agent in pharmaceutical and food manufacturing contexts, helping improve flow properties and reduce sticking of materials during processing.

What It Is

Sodium stearyl fumarate (CAS 4070-80-8) is a sodium salt of stearyl fumaric acid used as a functional food additive and processing aid. It appears as a white to off-white powder with limited solubility in water and is often incorporated for its rheological and processing benefits. Its technical functions include material conditioning, lubrication, and release facilitation in food and pharmaceutical production settings. In food technology contexts, it is classified as a dough strengthener, leavening agent, lubricant, or release agent, where it can help improve the handling and quality of doughs, batters, and other formulations. In pharmaceutical manufacturing, it is valued as a lubricant or antiadherent in solid dosage production. Because it does not impart flavor or sweetness, its use is primarily functional rather than sensory. The compound’s long fatty chain contributes to its ability to interact with hydrophobic and semi-solid matrices, aiding in consistency and process efficiency in complex formulations.

How It Is Made

Sodium stearyl fumarate is produced by esterification of stearyl alcohol with a fumaric acid derivative, typically maleic anhydride, followed by isomerization and neutralization with sodium to form the sodium salt. This sequence yields a long-chain fatty ester that combines the hydrophobic stearyl group with a fumarate backbone, yielding the desired functional physicochemical properties. The manufacturing process is designed to achieve a high purity level, often exceeding 98%, to meet food-grade and pharmaceutical-grade specifications. Rigorous purification and quality control measures ensure minimal residual reactants and byproducts, aligning with regulatory standards for direct addition to foods and inclusion in pharmaceutical excipient lists. The finished product is typically dried and milled to a fine powder to facilitate uniform incorporation into dry blends and formulations. Its production is governed by appropriate chemical safety and quality assurance protocols to ensure consistency and compliance with relevant food additive and excipient specifications.

Why It Is Used In Food

In food processing, sodium stearyl fumarate is used for its ability to condition doughs and batters, improving machinability and handling during production. As a dough strengthener and conditioning agent, it helps support the development of structure and texture in baked goods by modulating gluten network interactions and improving gas retention. Its role as a lubricant or release agent helps reduce friction and sticking of dough to equipment during mixing, shaping, and baking operations. This can improve operational efficiency and reduce waste. In dehydrated or processed potato products and flour-thickened foods, it can contribute to more consistent rehydration and texture. These functions are distinct from sensory contributions such as flavor or sweetness; instead, sodium stearyl fumarate’s value in foods lies in its physical and mechanical influence on the product matrix and on processing behavior.

Adi Example Calculation

Because a specific numerical acceptable daily intake (ADI) has not been established in an accessible JECFA or EFSA evaluation, a numerical example using a regulatory ADI cannot be provided here. In general, if an ADI were defined, an illustrative calculation would involve multiplying the ADI value by body weight to estimate the total allowable intake for a hypothetical person, emphasizing that this calculation is illustrative and not a recommendation.

Safety And Health Research

Regulatory review of sodium stearyl fumarate has focused on its technical use and safety as a food additive and excipient. Toxicological data referenced in industry sources indicate that related fatty acid esters have been evaluated for safety and metabolism, with components such as stearyl alcohol and fumaric acid metabolized through normal biochemical pathways; however, detailed dedicated toxicological summaries for sodium stearyl fumarate’s oral ADI are not readily available in primary regulatory monographs. (ChemicalBook) General safety assessments in supplier and additive function resources describe the compound as having low acute toxicity and being generally nonirritant when handled appropriately, but these sources are not regulators and do not provide primary safety conclusions. Formal toxicological evaluations by bodies such as JECFA or in specialized safety monographs would be needed to define official health endpoints or specific hazard evaluations.

Regulatory Status Worldwide

In the United States, sodium stearyl fumarate is specifically permitted for direct addition to food under 21 CFR 172.826, which authorizes its use in various food categories under defined conditions of good manufacturing practice and maximum use levels. This regulation outlines permissible use as a dough conditioner in yeast-leavened bakery products, a conditioning agent in dehydrated potatoes and processed cereals, and a stabilizing agent in nonyeast-leavened bakery products and starch- or flour-thickened foods. Evidence of this regulatory authorization is documented in the electronic Code of Federal Regulations (eCFR) section for sodium stearyl fumarate. Sodium stearyl fumarate is also listed in food additive inventories such as the FDA Substances Added to Food database, indicating its recognized status for food use in the U.S. context. (联邦公报) At the international level, while JECFA and Codex Alimentarius maintain searchable specifications and evaluation mechanisms for food additives, the specific acceptable daily intake status for sodium stearyl fumarate itself has not been separately established in an accessible JECFA summary database entry, reflecting a lack of a standalone monograph with a numerical ADI. Evidence on broad expert committee evaluation processes is available through JECFA information portals and specification compendia. (FAOHome

Taste And Functional Properties

Sodium stearyl fumarate does not impart a significant taste on its own, making it suitable for use in products where flavor neutrality is essential. Its long fatty chain gives it hydrophobic characteristics that contribute to lubrication and anti-sticking properties, helping reduce friction between food matrices and processing equipment surfaces. Functionally, it interacts with both hydrophilic components such as flour proteins and hydrophobic phases, assisting in even distribution of processing forces during mixing and baking. Its stability to typical food processing conditions, including heat and mechanical stress, allows it to maintain function without degradation under normal manufacturing conditions. Because it is practically insoluble in water, its effects are primarily physical rather than chemical, influencing texture and processing dynamics rather than dissolving to contribute chemical functionality.

Acceptable Daily Intake Explained

Acceptable daily intake (ADI) is a toxicological concept used by regulatory bodies to estimate the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on available toxicological data and safety factors. ADIs are expressed on a body weight basis and are intended to guide safe use levels in food applications. For sodium stearyl fumarate, a specific numerical ADI has not been established in the publicly available JECFA summary database entries, meaning that regulators have not published a distinct numeric ADI value in an easily accessible evaluation. Consequently, it is used under conditions of good manufacturing practice as defined by food additive regulations rather than fixed ADI numbers.

Comparison With Similar Additives

Sodium stearyl fumarate can be compared with other processing aids that improve dough quality and processing performance, such as monoglycerides and sodium stearoyl lactylate. Monoglycerides often serve as emulsifiers and dough conditioners with functional benefits across a range of baked goods, aiding gas retention and crumb structure. Sodium stearoyl lactylate similarly influences dough strength and stability, though it also has pronounced emulsifying properties. In contrast, sodium stearyl fumarate’s contributions are more focused on lubrication and conditioning rather than emulsification, and its hydrophobic long chain distinguishes its processing impact in specific formulations. These differences underscore that while several additives can contribute to dough handling and texture, their mechanisms and secondary effects differ based on chemical structure and functional class.

Common Food Applications Narrative

Sodium stearyl fumarate is used in a range of baked and processed foods where control of dough properties and ease of processing are priorities. In yeast-leavened bakery products, it helps condition dough to improve gas retention and uniform rise during fermentation and baking. In nonyeast-leavened bakery products, it may act as a stabilizing agent, helping maintain structure and texture. In dehydrated potato products and flour-thickened foods, its role as a conditioning agent supports uniform rehydration and finished product quality. These applications emphasize its functional benefits in improving processability and consistent textural outcomes rather than contributing flavor or nutritional value. The compound’s inclusion is typically guided by regulatory allowances and good manufacturing practice to achieve the desired technical effect while maintaining compliance with additive use standards.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.826

EFSA

  • Notes: EFSA specific approval status and numerical ADI not found in available deep links

JECFA

  • Notes: A specific JECFA ADI number was not found in the JECFA searchable database

Sources

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