CARRAGEENAN, CALCIUM SALT OF

CAS: 9049-05-2 EMULSIFIER OR EMULSIFIER SALT, STABILIZER OR THICKENER

Calcium salt of carrageenan is a food additive used for emulsification, stabilization and thickening in food systems and is regulated under US food additive provisions.

What It Is

CARRAGEENAN, CALCIUM SALT OF (CAS 9049-05-2) is a chemically modified form of carrageenan in which the naturally occurring calcium salt of the carrageenan polysaccharide complex predominates. Carrageenan itself is a family of high‑molecular‑weight polysaccharides extracted from red seaweeds (Rhodophyceae) that consists of alternating galactose and 3,6‑anhydrogalactose units with varying degrees of sulfation. Calcium carrageenan falls into the broad class of hydrocolloids and functions as an emulsifier, stabilizer or thickener in food systems because of its ability to interact with water and food macromolecules to form viscous solutions or gels. Calcium carrageenan is one of the defined "salts of carrageenan" regulated under specific food additive provisions in the United States. Its designation and use are tied to the technical function it serves in food formulations rather than to a nutrient profile. Carrageenan polysaccharides are typically categorized into kappa, iota and lambda types based on the pattern and number of sulfate groups; calcium carrageenan often reflects the dominance of the calcium cation in association with the polysaccharide backbone. In commercial practice, the term "calcium carrageenan" is used to distinguish this particular salt from other carrageenan salts such as sodium, potassium or ammonium. While pure carrageenan materials can vary in molecular weight and gelling properties, the presence of calcium can modify gel strength and solubility characteristics in comparison with other cation forms. In regulatory texts, substances like calcium carrageenan are described generically as modified carrageenan with increased dominance of a specific cation, in this case calcium, and permitted for use in food categories where emulsification, stabilization or thickening is technologically necessary. The regulatory identity is tied to carrageenan meeting specific identity provisions, with the calcium salt as the predominant cationic form, and it must be labeled to reflect this specific salt form when present in products. The chemical does not represent a single defined molecule in the classical sense but rather a class of polysaccharide salts with calcium as the principal counterion. This structural characterization underlies both its technological roles in food and its regulatory definitions.

How It Is Made

Calcium carrageenan is produced from harvested red seaweed species that are known to contain carrageenan polysaccharides, such as Eucheuma and certain Gigartina species. The starting material is typically cleaned to remove extraneous organic and inorganic matter and then subjected to aqueous extraction under controlled temperature and pH to solubilize the sulfated polysaccharides. The extraction step yields a solution rich in the mixture of carrageenan polysaccharides with various naturally occurring salts. This aqueous extract may undergo clarification and filtration to remove insoluble impurities and low‑molecular‑weight substances. Once a carrageenan‑rich solution is obtained, the dominant cation species can be manipulated by ion exchange or by controlled addition of calcium salts to favor the formation of calcium carrageenan over other salt forms. Manufacturers may adjust process variables to enrich the extract in the calcium salt specifically, ensuring that the product meets identity and performance specifications. The enriched solution is then recovered, commonly by precipitation or concentration, washed and dried to produce a solid additive that predominantly contains the calcium carrageenan form. The final product is typically milled or micronized as needed to a particle size distribution suitable for handling and blending in food manufacturing operations. Specifications governing purity, moisture content and levels of residual salts or contaminants are applied to ensure consistency and compliance with applicable food additive regulations. These manufacturing practices aim to produce a stable, food‑grade ingredient that performs reliably as an emulsifier, thickener or stabilizer across a range of food systems. While different producers may use proprietary process details, the overall approach reflects industry‑standard hydrocolloid manufacturing techniques. The use of ion exchange, pH control and targeted cation enrichment distinguishes calcium carrageenan from other carrageenan salts.

Why It Is Used In Food

Calcium carrageenan is incorporated into food formulations because of its multifaceted functional properties that address common challenges in processed and formulated foods. Its principal uses as an emulsifier, stabilizer and thickener arise from its ability to interact with water and other food components, such as proteins and polysaccharides, to modify texture, improve mouthfeel and stabilize dispersed systems. When added to aqueous food systems, calcium carrageenan forms viscous solutions or weak gels depending on concentration and the presence of other solutes; these properties help maintain desirable texture and prevent separation of ingredients. As an emulsifier, calcium carrageenan supports the formation and stabilization of oil‑in‑water emulsions by contributing to the viscosity of the continuous phase and interacting with interfaces to reduce droplet coalescence. In dairy products, for example, it assists in stabilizing low‑fat formulations by forming a network that helps suspend fat droplets and proteins uniformly. As a stabilizer, it contributes to the uniform distribution of particulates and prevents phase separation over shelf life, which is critical in sauces, dressings and beverage applications. Its thickening action is utilized to achieve desired consistency in products such as puddings, dessert gels and certain bakery fillings. Another driver for the use of calcium carrageenan is the consumer expectation of texture continuity in processed foods; manufacturers rely on such additives to ensure that products meet consistent sensory attributes from batch to batch. From an operational perspective, the ingredient helps food processors manage viscosity and flow properties during manufacturing, storage and transportation. The combination of functionality and versatility has led to its adoption in a wide array of products where texture, stability and mouthfeel are key quality parameters. These technological benefits are central to its continued use in the food industry.

Adi Example Calculation

To illustrate how an Acceptable Daily Intake (ADI) might be applied in context, consider a hypothetical person weighing 70 kilograms (kg). If a regulatory body specifies an ADI of 75 mg/kg body weight per day for a food additive such as carrageenan, the total safe exposure threshold for that individual would be 75 multiplied by 70. In this illustrative scenario, the result would be 5250 milligrams per day, which represents the amount that could be consumed daily without exceeding the safety reference established by regulatory evaluation. It is important to emphasize that this calculation is purely illustrative and does not imply that any person should aim to consume this amount or that typical consumption patterns approach these levels. Actual intake of food additives from a varied diet is usually much lower than the ADI. Regulatory bodies set ADIs with built‑in safety factors that account for uncertainties and interspecies differences, ensuring that even sensitive individuals are unlikely to experience adverse effects at or below these thresholds. The illustrative calculation helps clarify how body weight and the numeric ADI value interact to produce an individualized reference point, highlighting the conservative and protective nature of this regulatory tool.

Safety And Health Research

Regulatory authorities and international scientific committees have evaluated carrageenan and its salt forms, including calcium carrageenan, through comprehensive review of available toxicological data. These evaluations typically examine endpoints such as acute toxicity, subchronic toxicity, genotoxicity and carcinogenicity to determine whether the additive presents safety concerns at exposure levels expected from food use. In the European Union, the European Food Safety Authority (EFSA) conducted a re‑evaluation of carrageenan (designated E 407) and processed Eucheuma seaweed (E 407a) in a scientific opinion adopted in 2018. The assessment examined toxicological studies, including subchronic toxicity studies in rodents that identified no‑observed‑adverse‑effect levels (NOAELs) at doses several orders of magnitude above typical dietary exposure. EFSA concluded that available data did not raise concerns for carcinogenicity or genotoxicity and maintained authorization for food uses, while classifying certain intake values as temporary pending additional data. This type of evaluation reflects systematic analysis of available evidence to identify potential hazard without asserting medical outcomes or physiological effects not directly supported by specific studies. Safety assessments often incorporate worldwide data from feeding studies, toxicokinetic evaluations and exposure estimates. In its re‑evaluation, EFSA noted that carrageenan was not absorbed intact in the digestive tract and that high‑dose rodent studies did not demonstrate adverse effects at levels far exceeding human exposure estimates. These studies inform regulatory decisions that focus on ensuring margins of safety between estimated dietary intake and doses used in toxicology studies. International expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) also review data on food additives and provide specifications and safety evaluations, but specific numeric acceptable daily intake (ADI) values from JECFA for calcium carrageenan were not directly identified in available regulatory sources at the time of writing. Overall, safety evaluations emphasize that permitted uses of calcium carrageenan are supported by data demonstrating technological need and lack of evidence for adverse effects at exposure levels associated with normal dietary patterns. Regulatory safety frameworks integrate available research to guide permissible uses, identity specifications and ongoing data collection, ensuring that safety assessments remain aligned with scientific understanding and good manufacturing practice.

Regulatory Status Worldwide

In the United States, salts of carrageenan, including calcium carrageenan, are permitted for use as food additives under the Federal Food, Drug, and Cosmetic Act. Specifically, the food additive provisions delineated in Title 21 of the Code of Federal Regulations at section 172.626 allow carrageenan modified to increase the concentration of a naturally occurring salt such as the calcium salt to serve as an emulsifier, stabilizer or thickener in foods where such use is technologically justified. The regulation mandates that the additive must meet identity criteria and that labeling reflects the dominant salt form present in the mixture. This regulatory allowance is part of a broader set of provisions for hydrocolloid food additives that have been evaluated for safety and technological necessity in food processing. The Code of Federal Regulations explicitly describes these salts of carrageenan and permits their use in accordance with prescribed conditions to ensure safe application in food products. The regulatory framework emphasizes that the additive must be used at levels necessary to achieve the intended technological effect and that standardized foods without provisions for such additives are excluded from permissive uses. This position reflects a balance between technological utility and consumer protection in food additive regulation. In the European Union, carrageenan as a food additive is designated by the E number E407 and is included in Annex II and Annex III of Regulation (EC) No 1333/2008 on food additives. Carrageenan and its processed Eucheuma seaweed form (E 407a) have been subject to re‑evaluation by the European Food Safety Authority (EFSA), which maintained its authorization for general food uses following a scientific opinion in 2018. EFSA’s assessment considered available toxicological evidence and reaffirmed the additive’s approval, while identifying areas for continued data refinement. The regulatory status in the EU reflects long‑standing inclusion of carrageenan in the list of permitted hydrocolloid food additives with defined purity criteria. In addition, EFSA’s re‑evaluation incorporated risk assessment frameworks that apply across population groups, ensuring that authorized uses align with safety data and technological need. Other regulatory systems worldwide generally align with these positions, recognizing carrageenan and its salts as functional food additives when used within defined specifications and technological contexts. These frameworks consider available safety data and require manufacturers to adhere to established identity and purity criteria as part of good manufacturing practice. The global regulatory landscape underscores the importance of scientific evaluation alongside technological utility in managing the use of food additives such as calcium carrageenan.

Taste And Functional Properties

Calcium carrageenan itself does not contribute a distinct flavor to food products, and at typical usage levels it is considered neutral in taste. Its primary contributions in sensory terms relate to texture and mouthfeel rather than flavor. When dissolved or dispersed in water, calcium carrageenan can produce a range of viscous solutions or weak gel structures, depending on concentration and environmental factors such as temperature and pH. These rheological properties are central to its functional role in food systems where body, thickness and stability are desirable. In aqueous solutions, the polysaccharide chains of calcium carrageenan interact with water molecules and each other to create a network that increases viscosity and, in some cases, yields a gel. The presence of calcium ions influences the extent and strength of gelation, and calcium carrageenan typically exhibits gel properties that differ from other salt forms, such as sodium or potassium carrageenan. Functional behavior is also affected by factors like temperature; hydration and dissolution often occur more readily in warm water, while cooling can enhance gel strength in formulations designed to set upon cooling. The molecular weight distribution of the carrageenan and degree of sulfation also influence the texture and stability properties. Calcium carrageenan is stable across a range of pH conditions commonly found in food products and can withstand typical thermal processing conditions without dramatic loss of functionality. Its stability to shear and compatibility with other hydrocolloids, proteins and sugars makes it adaptable in complex formulations. These functional properties enable product developers to fine‑tune texture, control syneresis and maintain consistent product quality in diverse applications, from dairy desserts to savory sauces. Because of its neutral sensory profile, calcium carrageenan does not interfere with intended flavor profiles, allowing the intrinsic flavors of other ingredients to shine.

Acceptable Daily Intake Explained

Acceptable Daily Intake (ADI) is a concept used by regulatory and scientific bodies to describe the amount of a substance that can be consumed on a daily basis over a lifetime without appreciable health risk. It is typically expressed as milligrams of substance per kilogram of body weight per day (mg/kg bw per day) and is derived from toxicological studies that identify doses at which no adverse effects are observed in animal models, followed by application of safety factors to account for uncertainty and variation between species and human populations. ADIs are not recommendations to consume a substance but rather benchmarks for safety assessment and regulatory decision‑making. They help ensure that exposure from food additives remains well below levels associated with adverse outcomes in controlled studies. For carrageenan (E 407) and processed Eucheuma seaweed (E 407a), EFSA’s re‑evaluation identified an existing group ADI of 75 mg/kg bw per day based on historical evaluations, which was maintained as a temporary reference while data gaps are being addressed. This figure reflects a conservative estimate of safe exposure for general populations based on extensive toxicological data. Importantly, ADIs are derived using precautionary approaches; they incorporate safety factors that account for uncertainties in the data, differences between animals and humans, and variability among individuals. Because ADIs represent thresholds well above expected dietary exposures, actual consumer intake of food additives like calcium carrageenan is generally far lower than the ADI, reinforcing the conclusion that typical uses are compatible with current safety standards. The concept of ADI provides context for how regulators balance technological utility with consumer safety. While ADIs are valuable for regulatory assessments, they do not correspond to nutritional requirements or desirable intake levels. Instead, they serve as reference points that inform allowable uses and help guide industry practices to ensure that cumulative exposure from multiple sources remains within safe limits. ADIs are periodically reviewed and updated as new data become available, ensuring that regulatory frameworks reflect current scientific understanding.

Comparison With Similar Additives

Calcium carrageenan belongs to a broader class of hydrocolloid additives that include other carrageenan salts and polysaccharide gums. Comparisons with similar additives such as sodium carrageenan, kappa carrageenan, iota carrageenan and locust bean gum illustrate how differences in structure and salt form influence functional properties in food systems. Sodium carrageenan, for example, often produces softer gels and higher solubility in certain solutions compared with the calcium salt, which can form stronger and more elastic gels under specific conditions. These distinctions affect texture, mouthfeel and stability in finished products, guiding formulation choices based on desired sensory outcomes. Other hydrocolloids such as locust bean gum interact differently with water and other food components, often used in combination with carrageenans to create synergistic gel networks that enhance texture. From a regulatory perspective, each of these additives has its own identity, permitted uses and specifications. Sodium and potassium forms of carrageenan are permitted under similar provisions as calcium carrageenan when they meet identity criteria and serve similar technological functions. Locust bean gum and similar gums have distinct regulatory pathways and functional niches but are all evaluated against safety data to ensure that their uses align with acceptable exposure levels. Comparing calcium carrageenan with these related additives highlights how functional properties, such as gel strength, solubility and interaction with other ingredients, drive selection in food formulation while regulatory frameworks ensure that all such additives meet safety and identity criteria appropriate for their uses.

Common Food Applications Narrative

Calcium carrageenan finds wide application across multiple segments of the food industry because of its ability to deliver reliable texture, stability and emulsification in diverse product types. In chilled desserts such as puddings and gelled desserts, it helps achieve smooth, uniform texture with controlled viscosity that consumers expect; its gel‑forming capacity contributes to the body and bite of the finished product. In processed dairy products, including reduced‑fat and low‑fat milk drinks, cultured dairy beverages and certain cheese analogs, calcium carrageenan supports uniform suspension of ingredients and prevents separation, which is especially important when fat content is modified to meet nutritional profiles. In beverage applications, particularly those that combine fruit juices with water or dairy components, calcium carrageenan assists in stabilizing cloudiness and preventing ingredient stratification over shelf life. It also plays a role in sauces, gravies and dressings where thickening and emulsification help achieve desirable pourability and mouthfeel. In bakery fillings and confections, calcium carrageenan enhances texture and moisture retention, contributing to extended shelf life and consistent sensory quality. While its uses are diverse, the common thread across these applications is the need to manage texture and stability in complex mixtures that contain water, fats and other solutes. Manufacturers select calcium carrageenan where its functional profile aligns with product goals such as suspension stability, creamy mouthfeel, gel strength and heat stability. As an ingredient, it bridges formulation challenges that arise from consumer demand for specific product qualities such as reduced fat, clean label perception and consistency across batches. The integration of calcium carrageenan into these food categories illustrates how hydrocolloids are central to modern food processing, helping translate consumer expectations into scalable manufacturing outcomes.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.626

EFSA

  • Approved: True
  • E Number: E407
  • Adi Display: 75 mg/kg bw per day
  • Adi Mg Per Kg: 75

JECFA

  • Notes: Specific JECFA numeric values not found in available JECFA deep links

Sources

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