CALCIUM BENZOATE

CAS: 2090-05-3 ANTIMICROBIAL AGENT

Calcium benzoate is a calcium salt of benzoic acid used primarily as an antimicrobial food additive that helps inhibit growth of bacteria, yeasts, and molds in acidic food products.

What It Is

Calcium benzoate is a synthetic chemical compound that functions as an antimicrobial preservative in food, beverages, and related products. Its systematic chemistry identity is the calcium salt of benzoic acid, identified by CAS number 2090-05-3, and it is commonly labeled with the INS number 213 in international food additive nomenclature. Calcium benzoate and related benzoate salts such as sodium benzoate and potassium benzoate belong to a class of preservatives used to limit microbial growth, particularly in slightly acidic to acidic environments. The compound typically appears as a white to off-white crystalline powder and is valued for its ability to extend product shelf life while maintaining food quality over time. Calcium benzoate’s antimicrobial functionality arises from the benzoate anion, which is effective at inhibiting many bacteria and fungi at low pH, making it especially suitable for acidic food matrices. As a derivative of benzoic acid, calcium benzoate is often selected where solubility and handling properties differ from the free acid form, helping formulators tailor preservation strategies for specific food systems. Its acceptance as a food additive in many global markets follows scientific evaluations on safety and efficacy that support its controlled use under defined regulatory conditions. Calcium benzoate’s other chemical names reflect its composition and historical classifications within food additive regulatory frameworks.

How It Is Made

The industrial production of calcium benzoate generally involves the neutralization of benzoic acid with a calcium base such as calcium hydroxide or calcium bicarbonate, forming the calcium salt and water. This reaction is a straightforward acid-base chemistry step that yields high-purity calcium benzoate when conducted under controlled conditions. Benzoic acid itself is often produced through the catalytic oxidation of toluene, and quality control steps ensure that the acid meets stringent criteria required for food-grade applications. Neutralization and subsequent purification produce a dry, crystalline product that can be formulated into food ingredients. In manufacturing contexts, food-grade calcium benzoate is subjected to filtration, drying, and milling steps to achieve specific particle size and moisture specifications suitable for blending into food formulations. Impurities and trace metals that could compromise quality are monitored and limited according to specifications laid down in international compendia and food additive monographs. Calcium benzoate may be offered in various hydrate forms, with anhydrous or hydrated grades depending on supplier and application needs. These manufacturing protocols emphasize consistent quality, compliance with purity standards, and minimizing contaminants that could affect either safety or functional performance in food systems. Analytical verification methods, such as titration against standard acids or chromatographic techniques, are routinely used to confirm the identity and purity of the product. This high level of control over production processes helps ensure that calcium benzoate performs reliably as an antimicrobial agent when incorporated into finished food and beverage products.

Why It Is Used In Food

Calcium benzoate is used in food primarily to inhibit the growth of spoilage microorganisms such as bacteria, yeasts, and molds that can lead to quality degradation, off flavors, and potential safety concerns. Its effectiveness is most pronounced in acidic conditions where the undissociated benzoic acid form is more prevalent, making calcium benzoate suitable for foods with lower pH values. Preservatives like calcium benzoate help maintain a consistent quality profile throughout the expected shelf life of packaged foods, reducing waste and ensuring consumer acceptance. Formulators choose calcium benzoate for several practical reasons, including compatibility with acidic food systems such as fruit juices, carbonated beverages, and pickled products. It offers flexibility in product design by functioning at low concentrations, allowing maintenance of sensory attributes while providing antimicrobial protection. In addition to microbial inhibition, preservative systems can support product safety by limiting conditions that might otherwise allow undesirable microbial proliferation. In many jurisdictions, the use levels of calcium benzoate are defined by regulatory standards that take into account typical dietary exposures and safety evaluations by food safety authorities. Use of calcium benzoate is part of an overall food preservation strategy that may also involve other hurdles such as refrigeration, packaging technologies, and hygienic processing practices. The combined approaches help limit spoilage and extend shelf life without compromising nutritional or sensory quality. Calcium benzoate’s practical utility in foods reflects decades of food science research and regulatory evaluation that recognize its role in modern food systems.

Adi Example Calculation

To illustrate how an acceptable daily intake (ADI) can be used to contextualize exposure, consider a hypothetical scenario. If an ADI is expressed in terms of benzoic acid equivalents at a certain milligram per kilogram body weight per day, and a person weighs 70 kilograms, one would multiply the body weight by the ADI figure to determine the total daily amount of benzoate compounds considered safe for lifetime exposure. For example, if the ADI is defined as X mg per kilogram body weight, the calculation would be: Total safe daily intake = X mg/kg bw/day * 70 kg. This illustrative calculation shows how the ADI helps translate regulatory safety benchmarks into quantities that can be compared against estimated intake from food consumption. It does not represent a target exposure or recommended level of consumption; rather, it provides context for assessing whether typical dietary exposures remain within boundaries established by scientific safety evaluations.

Safety And Health Research

The safety evaluation of calcium benzoate as a food additive revolves around extensive toxicological data on benzoic acid and its salts, including calcium benzoate. Scientific committees responsible for food additive safety assess parameters such as acute toxicity, subchronic and chronic toxicity, reproductive and developmental toxicity, and genotoxicity to derive safety benchmarks. International assessments by JECFA and regional bodies like EFSA consider these data collectively to characterize risk and inform acceptable exposure levels. (世界卫生组织 Toxicological studies in experimental animals investigate endpoints that help determine whether exposure at levels relevant to human consumption poses health concerns. Regulators integrate these findings with dietary exposure estimates to ensure that actual use levels in foods remain well below thresholds associated with adverse effects. Calcium benzoate is evaluated in terms of its contribution to total benzoate intake rather than in isolation, reflecting the shared metabolic pathways and similar properties of related benzoate salts. Overall, authoritative evaluations have not identified direct adverse health effects at exposure levels consistent with regulated use in foods, which supports continued authorization. Ongoing monitoring of scientific literature and periodic re-evaluations by regulatory agencies help ensure that new data can be incorporated into risk assessments as needed. This approach exemplifies the precautionary framework used in food additive safety evaluation.

Regulatory Status Worldwide

Calcium benzoate is recognized as a permitted food additive in several major regulatory jurisdictions. In the European Union, it is included among authorized preservatives subject to regulatory specifications, and scientific re-evaluation has been conducted by the European Food Safety Authority (EFSA), which reviewed calcium benzoate along with benzoic acid and other benzoate salts as part of a comprehensive food additive safety assessment. That review confirms its authorization and outlines purity criteria and usage guidelines applicable within the EU market, identifying it with the E number E213. On the international stage, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated calcium benzoate and related benzoate salts, maintaining a group acceptable daily intake (ADI) expressed in terms of benzoic acid equivalents. These international evaluations support harmonized standards and inform Codex Alimentarius provisions referenced by many national regulators. (EFSA Online Library) In the United States, calcium benzoate is listed in contexts such as food contact substance inventories and has historical listings associated with food additive use, but specific direct food additive listings in the primary food additive regulations of the US Code of Federal Regulations are not straightforward to locate under traditional food additive parts. For this reason, its regulatory status in the US may involve recognition through inventories such as the Substances Added to Food database, rather than a specific direct food additive permission. Regulatory frameworks in other regions such as Australia, New Zealand, and parts of Asia similarly incorporate it into lists of permitted preservatives with defined conditions of use. These worldwide regulatory perspectives reflect ongoing safety evaluations and define how calcium benzoate can be used in practice.

Taste And Functional Properties

Calcium benzoate itself is not typically associated with a distinct taste at the levels used for microbial control, though at higher concentrations it may contribute a slightly bitter or acidic note. In many food applications, its sensory impact is masked by the natural flavor profiles of the product, such as fruit juices and sauces. Sensory evaluation during product formulation ensures that preservative levels do not adversely affect consumer perception. Functionally, calcium benzoate is valued for its solubility in water and relative stability in acidic environments. It dissociates to release benzoate anions which exert antimicrobial effects by interfering with the metabolic activities of susceptible microorganisms. The performance of calcium benzoate can be influenced by pH, temperature, and the presence of other food components, and formulators often consider these factors when selecting preservatives. Its performance reflects a balance between microbial inhibition and minimal sensory interference, making it suitable for a range of applications where acidity and preservation needs coincide. From a processing perspective, calcium benzoate is stable under typical food processing conditions, including pasteurization and blending. It integrates into dry mixes, syrups, and liquid formulations without significant degradation. These functional properties support its adoption in diverse food product categories where preservation without substantial sensory change is desirable.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a safety benchmark used by food safety authorities to indicate the amount of a food additive that can be consumed every day over a lifetime without appreciable health risk. It is typically expressed in milligrams of additive per kilogram of body weight per day and is derived from toxicology studies using conservative assumptions and safety factors to protect sensitive populations. In the case of benzoic acid and its salts, including calcium benzoate, JECFA established a group ADI expressed as benzoic acid equivalents that reflects collective data on this class of preservatives. (EFSA Online Library) It is important to emphasize that the ADI is not a recommended intake level but rather a regulatory reference point that assists risk managers in setting permitted use levels in food categories and evaluating dietary exposures. Actual daily intake for most individuals is typically well below the ADI when additives are used within approved limits. The ADI helps ensure that even frequent consumers of products containing the additive are unlikely to approach exposure levels associated with toxicological concerns. As scientific knowledge evolves, regulatory bodies may revise ADI values to reflect new data.

Comparison With Similar Additives

Calcium benzoate belongs to a group of benzoate preservatives that share similar functional roles in food preservation. Sodium benzoate and potassium benzoate are closely related salts of benzoic acid that also act as antimicrobial agents in acidic food systems. While all these benzoate salts function to inhibit microbes, formulators may choose one over another based on factors such as solubility, interaction with other ingredients, and sensory considerations. Calcium benzoate, for example, can offer distinct solubility characteristics compared to sodium benzoate, which can influence processing choices. Other preservative classes, such as sorbates (e.g., potassium sorbate) and propionates (e.g., calcium propionate), provide alternative antimicrobial spectra and may be selected based on the specific microorganisms targeted or regulatory conditions in a given market. Sorbates tend to be effective against yeasts and molds, while propionates are often used in baked goods to inhibit mold growth. Comparing calcium benzoate with these alternatives illustrates how preservative selection involves balancing functional performance, regulatory acceptance, and product-specific formulation needs. Each class of preservatives has undergone safety evaluations to support its use within defined regulatory frameworks.

Common Food Applications Narrative

Calcium benzoate is broadly utilized in consumer food and beverage categories where acidic conditions prevail and preservation against microbial spoilage is critical. In acidic fruit-based beverages and juice blends, it acts as a preservative that helps maintain product quality from production through distribution and retail display. Carbonated soft drinks with lower pH values may also incorporate calcium benzoate to inhibit yeast and mold growth, particularly where sugar content and storage conditions could otherwise promote spoilage. Acidic condiments such as vinegars, dressings, and sauces benefit from its antimicrobial role, helping these products remain microbiologically stable without altering their intended sensory attributes. In bakery products, calcium benzoate may be part of a preservation system that supports shelf life, especially in formulations where moisture and acidity levels create conditions favorable to mold growth. Ready-to-drink tea beverages and flavored waters with acidic pH also frequently rely on benzoate preservatives for quality maintenance. Furthermore, products like jams, jellies, and fruit spreads that combine high sugar levels with acidic pH often incorporate calcium benzoate as part of a broader preservation strategy to ensure consistency during consumer use. Calcium benzoate’s application extends into niche areas such as pickled vegetables, fermented sauces, and other prepared foods where natural acidity provides part of the preservative effect. In all these cases, its use supports regulatory labeling requirements by contributing to microbial control without introducing off-flavors or compromising product integrity. The selection of calcium benzoate in these categories reflects both its functional performance and the regulatory framework that recognizes its suitability for specific food applications.

Safety & Regulations

FDA

  • Notes: Direct approval as a food additive in primary FDA food additive regulations not confirmed; may be listed in inventories such as Substances Added to Food without specific direct listing.

EFSA

  • Notes: EFSA has evaluated it as part of food additive group and confirmed authorization but numeric ADI not explicitly stated in d opinion.
  • Approved: True
  • E Number: E213

JECFA

  • Year: 1996
  • Ins Number: 213
  • Adi Display: 0-5 mg/kg bw
  • Adi Mg Per Kg: 5

Sources

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