CARRAGEENAN, POTASSIUM SALT OF

CAS: 64366-24-1 EMULSIFIER OR EMULSIFIER SALT, STABILIZER OR THICKENER

Potassium carrageenan, or the potassium salt of carrageenan, is a carrageenan derivative used in foods for emulsification, stabilizing, and thickening. It is permitted as a food additive under US federal regulation 21 CFR 172.626 and has been reviewed by international expert bodies including JECFA.

What It Is

Potassium carrageenan, formally known as CARRAGEENAN, POTASSIUM SALT OF with CAS number 64366-24-1, is a modified carrageenan derivative used for its functional properties in foods. Carrageenan itself is a family of sulfated polysaccharides extracted from red seaweed that are widely used in the food industry as hydrocolloids. The potassium salt form refers to the predominance of potassium ions associated with the carrageenan polymer backbone, which alters certain functional properties such as gel strength and solubility compared with other salt forms. This ingredient functions as an emulsifier or emulsifier salt and also as a stabilizer or thickener, helping to blend ingredients and maintain texture in a variety of food products. Carrageenans are high-molecular-weight carbohydrate polymers composed of repeating galactose units and are naturally derived from red seaweeds. The potassium salt form is one of several carrageenan salts used in industry alongside sodium, calcium, and ammonium forms. Because of its polymeric nature and ability to interact with water and other food components, potassium carrageenan is included on regulatory inventories of permitted food additives. For example, the United States Code of Federal Regulations specifically lists salts of carrageenan, including potassium carrageenan, among food additives that may be safely used under prescribed conditions, indicating its acceptability in regulated food use according to established rules. This designation reflects safety assessments by regulatory authorities and decades of use in food formulations.

How It Is Made

Potassium carrageenan is derived from raw carrageenan extracted from red seaweeds. The general process for producing carrageenan begins with harvesting red seaweed species and subjecting them to aqueous extraction. In the extraction phase, seaweed biomass is immersed in hot water or alkaline solutions to solubilize carrageenan polymers. After extraction, the liquor containing dissolved carrageenan is separated from the solid seaweed residue by filtration. The carrageenan extract is then purified and precipitated. Traditional methods include alcohol precipitation, potassium chloride gel pressing, or freezing procedures that help isolate carrageenan from the extract solution. The choice of recovery method influences the final grade and form of the carrageenan product. For potassium carrageenan specifically, processing conditions are adjusted so that potassium ions are the predominant counterion associated with the carrageenan polymer. This is achieved by treatment with potassium salts during purification and precipitation, ensuring that the final additive product is enriched in the potassium salt form. The final stages involve drying and milling the recovered carrageenan into a powder or flake suitable for use in food manufacture. Although the broad outlines of the process are described here, specific industrial implementations vary by manufacturer and proprietary practices. Quality control and compliance with food additive specifications are critical to ensure the ingredient meets regulatory and food grade standards.

Why It Is Used In Food

Potassium carrageenan is used in food for its technological functions that improve product structure, texture, and stability. Emulsifiers and stabilizers like potassium carrageenan help maintain the uniform dispersion of ingredients that would otherwise separate, such as water and fat phases in complex food systems. When used as a thickener, it increases the viscosity of liquid formulations and contributes to desirable mouthfeel. Formulators often choose potassium carrageenan for applications where specific texture and gel properties are needed. Its ability to interact with proteins and other hydrocolloids enables it to form stable gels under selected conditions, making it useful in dairy analogs, dessert gels, and sauces that require controlled thickness. In combination with other hydrocolloids, potassium carrageenan can modulate texture and synergies that support product stability over shelf life. From a manufacturing perspective, food ingredients with multifunctional roles help streamline formulations. By serving as an emulsifier to help mix oil and water, a stabilizer to help prevent ingredient separation, and a thickener to adjust viscosity, potassium carrageenan reduces the need for multiple separate additives. This versatility reduces formulation complexity and supports consistent sensory and physical qualities in finished products.

Adi Example Calculation

Because JECFA did not specify a numeric ADI for carrageenan in its database entry, a representative numeric example cannot be provided with direct regulatory sourcing. In jurisdictions where numeric ADIs are established for food additives, illustrative calculations typically involve multiplying the ADI by a hypothetical body weight to estimate the total allowable daily intake. For example, if an hypothetical ADI of X mg per kg body weight were specified, an individual weighing 60 kilograms could theoretically consume up to X times 60 mg per day without exceeding regulatory guidance. However, because no numeric ADI is directly sourced for carrageenan in the referenced JECFA record, this section explains the general principle rather than applying a specific regulatory number.

Safety And Health Research

Regulatory bodies review safety data for food additives like potassium carrageenan to ensure they meet standards for use in foods. Evaluations consider absorption, distribution, metabolism, and excretion, as well as toxicological studies that explore effects in laboratory models. For carrageenan broadly, JECFA has assessed safety data, including specific use scenarios such as inclusion in special formulas, and did not specify a numeric ADI, reflecting its review of available data. (See JECFA database entry in sources.) Scientific assessments examine whether the polymer is absorbed intact or broken down in the gastrointestinal tract and look at long-term and short-term studies in animals to identify any potential adverse effects. Research also evaluates molecular weight and processing characteristics because different forms of the polymer can behave differently biologically. While carrageenan has been widely used in food systems for many years, ongoing research and regulatory re-evaluations periodically revisit the database to ensure continued compliance with safety expectations. In the European Union, EFSA has conducted re-evaluations of carrageenan and related seaweed derivatives under its food additive assessment program, producing opinions that consider toxicological data and exposure estimates. These reviews do not provide a simple numeric ADI in all cases, and some work programs aim to address identified data gaps. Safety assessments emphasize regulatory science principles, including review of relevant studies and exposure contexts to ensure that authorized uses remain appropriate.

Regulatory Status Worldwide

In the United States, potassium carrageenan and other salts of carrageenan are permitted as direct food additives under Title 21 of the Code of Federal Regulations. Section 172.626 of 21 CFR specifically addresses salts of carrageenan, including potassium carrageenan, and allows their use as emulsifiers, stabilizers, or thickeners under prescribed conditions. This regulation underscores that the ingredient can be used at levels necessary to achieve its technical effect in foods except in standardized foods that prohibit such use. Source documents from the eCFR outline the conditions for safe use of carrageenan salts. (See sources.) Internationally, carrageenan derivatives are included in the Codex General Standards for Food Additives (GSFA) and have been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA). According to the JECFA database entry for carrageenan, the additive has the International Numbering System (INS) number 407, and JECFA reviewed safety data including specific use in formula contexts. JECFA has not specified a numerical acceptable daily intake (ADI) for carrageenan, reflecting a view that available data supported its use under conditions of good manufacturing practice. In the European Union, carrageenan is identified by the E number E407 when approved for use, and regulatory reviews have been conducted by the European Food Safety Authority (EFSA). These evaluations consider functional uses and safety data for carrageenan in foods, and regulatory lists continue to evolve. Because specific numeric regulatory values vary by jurisdiction and the ingredient has been subject to ongoing re-evaluations, users should consult relevant regulatory texts for the most current authority in each market.

Taste And Functional Properties

Potassium carrageenan itself has little to no taste, which makes it suitable for use in a wide range of food applications without imparting noticeable flavor. Its primary sensory impact comes from changes in texture rather than taste. When dissolved in water and incorporated into food matrices, it contributes body, creaminess, and gel structure, which consumers associate with richness and smoothness in foods. Functionally, potassium carrageenan is soluble in hot water and disperses to form viscous solutions. Its thickening and gelling properties depend on its molecular structure and the presence of counterions, with potassium ions promoting stronger gel networks in some carrageenan types. The stability of these gels is influenced by pH, temperature, and the presence of other components like sugars or proteins. For example, in dairy systems, carrageenan interacts with milk proteins to create a stable structure that resists syneresis and separation. Heat stability and pH tolerance are important for formulators to consider. Potassium carrageenan generally withstands typical cooking and pasteurization temperatures used in food processing, though extreme conditions can alter its functional behavior. Under acidic conditions, its viscosity contribution may change, so formulators balance ingredient levels with the overall formulation environment. The net effect is a versatile additive that enhances texture and stability without adding flavor notes or interfering with other sensory attributes.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory concept representing the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, as judged by expert committees. For carrageenan and its salts, ADIs are established or considered by bodies such as JECFA and EFSA based on available toxicological and exposure data. JECFA’s evaluation of carrageenan did not specify a numeric ADI, which indicates that, at the time of evaluation, the committee did not identify a quantitative limit that needed to be communicated or that the consensus was that use according to good manufacturing practice did not require a numeric ADI. In contrast, some regional authorities use numeric ADIs for substances with well-defined dose-response data. The lack of a specified numeric ADI does not imply a safety concern but rather reflects how the available data were interpreted in the context of regulatory frameworks. Consumers should understand that ADIs are regulatory tools and not recommended intake levels. Food producers use ADIs and regulatory guidance to ensure that ingredient levels in foods remain within safe boundaries established through scientific review.

Comparison With Similar Additives

Potassium carrageenan is one of several hydrocolloid additives used for thickening, emulsifying, and stabilizing. Other examples include guar gum, xanthan gum, and locust bean gum. Guar gum is a galactomannan polysaccharide often used for high-viscosity needs at relatively low inclusion levels and is valued for its neutral flavor and stability in cold applications. Xanthan gum, a microbial fermentation product, imparts shear-thinning behavior that can be useful in sauces and dressings that need to pour easily but resist separation. Locust bean gum is another plant-derived hydrocolloid that synergizes with carrageenan in some gel systems, producing firm textures in dairy and dessert products. Unlike potassium carrageenan, which forms gels in the presence of specific ions, locust bean gum’s gelation behavior often depends on heat-cool cycles and combinations with other gums. Each of these hydrocolloid additives serves overlapping functions, but they differ in solubility, gel strength, and interactions with other ingredients, which influences formulators’ choices in product development.

Common Food Applications Narrative

Potassium carrageenan appears in a wide range of foods where texture, thickness, and stability are important. Its use spans several categories of consumer foods, particularly where emulsification and gel formation are needed. In dairy analogs and plant-based milks, potassium carrageenan helps suspend particles and prevents separation, supporting a smooth and consistent pourable texture. It also contributes to the structure of dessert gels like puddings and gelled confections by forming a network that entraps water and creates a pleasing mouthfeel. In sauces and dressings, potassium carrageenan supports viscosity and helps maintain a uniform dispersion of oil and water, giving products a cohesive and stable appearance. The additive is also found in processed meats and meat alternatives, where it contributes to sliceability and moisture retention. Bakery fillings and frostings may use it to adjust consistency, preventing weeping and ensuring stable performance through refrigeration and service. The flexibility of potassium carrageenan means it is also found in beverages, particularly those that require suspension of flavor or nutrient particles, and in jellies and fruit preparations, where it contributes to gel firmness and cut quality. Across these broad applications, the functional benefits focus on consistent quality and consumer-expected texture, making potassium carrageenan a valuable tool for food developers seeking specific rheological properties.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.626

EFSA

  • Notes: EFSA re-evaluation does not provide a single numeric ADI in the authoritative opinion or additional numeric sources were not included.
  • E Number: E407

JECFA

  • Notes: JECFA did not specify a numeric ADI in the referenced database entry.
  • Ins Number: 407

Sources

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