ANOXOMER
ANOXOMER is a polymeric antioxidant food additive permitted in the United States under 21 CFR 172.105 for direct addition to food to prevent oxidation of fats and oils.
What It Is
ANOXOMER is a synthetic, high-molecular-weight polymeric antioxidant used as a food additive to slow oxidative rancidity in fats and oils. It is identified by the Chemical Abstracts Service (CAS) number 60837-57-2 and is classified technically as an antioxidant polymer. The additive consists of a condensation polymer prepared from monomers such as divinylbenzene and a mixture of substituted phenolic antioxidants. Because of its large polymeric structure, ANOXOMER is nondigestible, meaning it is designed not to be absorbed in the digestive tract when consumed. The primary function of ANOXOMER in food is to protect lipid-containing food products against oxidative degradation, thereby extending shelf life and helping to maintain quality during storage and processing. It has a specific regulatory identity codified in the United States Code of Federal Regulations, which describes its chemical composition and permitted use conditions. The polymeric nature and antioxidant function of ANOXOMER distinguish it from low-molecular-weight antioxidants that may be absorbed into the body. In practice, ANOXOMER is incorporated into foods with significant fat or oil content, where its antioxidant activity helps prevent the formation of off-flavors and potentially harmful oxidation products. ANOXOMER’s design reflects a strategy in food additive development to combine functional effectiveness with reduced systemic exposure by limiting digestibility.
How It Is Made
The manufacture of ANOXOMER involves a condensation polymerization process in which several phenolic monomers are covalently linked via divinylbenzene bridges. Key monomer components include tert-butylhydroquinone, tert-butylphenol, hydroxyanisole, and other substituted phenols. These monomers are reacted under controlled conditions to form a crosslinked polymer with high molecular weight. The process is engineered to produce a product with defined specifications, including high polymer purity and low levels of low-molecular-weight constituents such as monomers, dimers, and trimers. Polymerization usually begins with a mixture of the selected monomers in a solvent system under conditions that favor condensation, often in the presence of a catalyst. As chain growth progresses, the reactive vinyl groups serve to crosslink the growing polymer chains, resulting in a three-dimensional polymer network. The resulting polymer is then purified to remove unreacted monomers and other low-weight species, ensuring that the final product meets quality and safety specifications. After polymerization, ANOXOMER is typically isolated as a solid powder, which is then tested against analytical criteria to confirm identity, degree of polymerization, and absence of undesirable contaminants. In the regulatory context, such specifications are codified so that manufacturers can demonstrate compliance with food additive regulations. The polymer’s chemistry is tailored such that it remains stable under conditions of food processing and storage but does not degrade into absorbable metabolites in the gastrointestinal tract.
Why It Is Used In Food
ANOXOMER serves a key technological function in food systems by protecting fats and oils from oxidative deterioration. Oxidation is a chemical process in which unsaturated fatty acids react with oxygen, leading to the formation of peroxides and secondary oxidation products that cause rancid off-flavors, loss of nutritional quality, and potential formation of harmful compounds. By incorporating ANOXOMER into food formulations, manufacturers can slow these oxidative processes and enhance product stability during storage and distribution. The choice of ANOXOMER over other antioxidants may be influenced by its polymeric nature, which is designed to reduce absorption in the human digestive system. This property can be particularly attractive in applications where minimization of systemic exposure is desired. ANOXOMER’s antioxidant activity arises from its phenolic constituents that can donate hydrogen atoms to free radicals, thereby interrupting the radical chain reactions that propagate lipid oxidation. In practice, ANOXOMER is useful in a range of food products where fats and oils are susceptible to oxidation, such as edible oils, margarine, shortening, salad dressings, and other processed foods. Its inclusion helps maintain flavor, odor, and overall quality, contributing to consumer acceptability. The use of antioxidants like ANOXOMER also supports regulatory compliance with quality standards and can reduce food waste by extending shelf life.
Adi Example Calculation
To illustrate the concept of acceptable daily intake (ADI) in a hypothetical context, consider an example where an ADI for ANOXOMER is expressed as a range up to 8 mg/kg body weight per day, identified in historical evaluations. (Note that this example reflects historical evaluations and not current regulatory limits unless reaffirmed by authorities.) If an adult weighs 70 kg, multiplying this body weight by the upper value of 8 mg/kg bw/day yields a hypothetical maximum intake of 560 mg per day. An intake at or below this level over a lifetime would be considered consistent with the risk assessment assumptions used to derive the ADI. In this example, a child weighing 30 kg would have a corresponding hypothetical ADI of 240 mg per day. These calculations are purely illustrative to demonstrate how body weight and an ADI value interact. They do not imply advice on actual consumption or indicate that ANOXOMER is present at these levels in typical diets. Actual exposure depends on specific product formulations and consumption patterns.
Safety And Health Research
Regulatory toxicology research on ANOXOMER has historically focused on its biological inertness due to its high molecular weight and lack of systemic absorption. Studies evaluated by expert committees, including JECFA, examined mutagenicity and other toxicological endpoints to determine whether ANOXOMER posed genotoxic or systemic risks. The absence of significant dose- or time-related effects in bacterial mutation tests suggested a low genotoxic potential in those specific assays. (INCHEM) Because ANOXOMER is designed to remain nondigestible, it is expected to transit through the gastrointestinal tract with minimal absorption into the bloodstream. This characteristic influences safety assessments by reducing systemic exposure. Safety evaluations historically considered endpoints such as mutagenicity, reproductive toxicity, and subchronic effects, focusing on whether any breakdown products or minor low-molecular-weight fractions could present risks. Regulatory bodies consider available data collectively to determine whether use as a food additive is acceptable within defined use levels. Despite these assessments, safety research is continuously updated, and regulatory opinions may evolve as new data become available. Evaluations by committees such as JECFA provide a scientific basis for establishing guidance values, but they do not replace specific national regulatory decisions. The safety profile of ANOXOMER, therefore, reflects both historical toxicological study outcomes and ongoing regulatory oversight.
Regulatory Status Worldwide
In the United States, ANOXOMER is permitted for use as a food additive under Title 21 of the Code of Federal Regulations, section 172.105, which provides conditions for its safe use as an antioxidant in foods. This regulation specifies that ANOXOMER, identified by its CAS number 60837-57-2, may be safely used in accordance with defined conditions, including meeting identity and purity specifications and not exceeding permitted use levels based on fat content of the food. The regulation reflects a formal approval by the U.S. Food and Drug Administration (FDA) for this specific additive and its intended function in foods. The regulation also includes analytical criteria to ensure consistency and safety of the additive as used in food applications. Outside of the United States, global regulatory frameworks vary, and not all jurisdictions may have a specific authorization for ANOXOMER. Some regions may evaluate polymeric antioxidants under broader food additive safety programs or require submission of safety data before approval. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) conducted evaluations of ANOXOMER in the past and established a temporary acceptable daily intake, reflecting an international scientific assessment of safety. However, national or regional authorities may set their own policies or restrict use depending on local risk assessments and policy frameworks. (INCHEM) Because of these differences, food manufacturers intending to market products containing ANOXOMER in multiple countries should carefully review relevant regulatory lists and ensure compliance with local additive provisions.
Taste And Functional Properties
ANOXOMER, as a polymeric antioxidant, does not impart a distinct flavor of its own at the levels used in food applications. Because it is designed to protect fats and oils from oxidation rather than contribute sensory characteristics, its influence on taste is primarily indirect: by preventing rancidity, it helps preserve the intended flavor profile of the food. Functionally, ANOXOMER is effective in lipid-rich matrices, where its phenolic groups are positioned to intervene in free radical chain reactions that drive rancid development. Its polymeric structure confers high thermal stability, making it suitable for use in a variety of food processing conditions, including heat-intensive operations. While solubility in aqueous phases is limited due to its polymeric nature, ANOXOMER is compatible with oil phases, where its antioxidant activity is most needed. In addition to thermal stability, ANOXOMER displays resilience across a range of pH conditions typical of many food systems, although its effectiveness may vary with formulation. Its high molecular weight and lack of digestibility mean that it remains within the food matrix during digestion, reducing systemic absorption. As with all food additives, careful formulation and adherence to regulatory use levels are important to achieve desired functional outcomes without adversely affecting sensory quality.
Acceptable Daily Intake Explained
The acceptable daily intake (ADI) is a toxicological concept used to estimate the amount of a food additive that can be consumed daily over a lifetime without appreciable health risk. It is typically expressed in milligrams of additive per kilogram of body weight per day (mg/kg bw/day). The ADI is derived from toxicology data by identifying a no-observed-adverse-effect level (NOAEL) in studies and applying safety factors to account for uncertainties. For ANOXOMER, historical evaluations by expert committees suggested a temporary ADI in the form of a range, indicating scientific consideration of available data. It is important to understand that an ADI does not represent a recommended level of intake; rather, it is a guideline to help regulatory authorities and manufacturers ensure that typical exposures via food use remain below levels considered to pose negligible risk. Because food additive exposures depend on use levels in formulation and dietary patterns, actual intakes by individuals may vary. In regulatory settings, ADIs help inform permitted use levels and labeling requirements to protect public health. In practice, manufacturers formulate products to achieve functional benefits, such as oxidative stability, while adhering to regulatory maximum use levels. These regulatory frameworks are established with reference to the ADI and other safety considerations to ensure that consumer exposure remains within acceptable bounds throughout intended use.
Comparison With Similar Additives
ANOXOMER is one of several antioxidants used in food systems to slow lipid oxidation. Other common antioxidants include butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), and tocopherols (vitamin E derivatives). Functionally, BHA and BHT are low-molecular-weight phenolic antioxidants that act directly within lipid phases to interrupt free radical chain reactions, similar in mechanism to the phenolic groups in ANOXOMER. However, unlike ANOXOMER’s polymeric design, BHA and BHT are absorbable and subject to systemic metabolism, which can influence their toxicological profiles. Tocopherols, by contrast, are naturally occurring antioxidants with vitamin-like activity, and their inclusion in foods often aligns with both functional protection against oxidation and nutritional contribution. Compared with tocopherols, ANOXOMER does not provide nutritional benefit but is designed to minimize absorption. This difference may influence formulation choices depending on product goals and consumer expectations. Polymeric antioxidants such as ANOXOMER are particularly suited to applications where retention in the food matrix without systemic uptake is desired. In contrast, small-molecule antioxidants such as BHA, BHT, and tocopherols have broader uses but require consideration of their metabolic fate. Formulators often balance antioxidant potency, regulatory status, and consumer perceptions when selecting among these options.
Common Food Applications Narrative
ANOXOMER is used in a variety of food products that contain appreciable levels of fats and oils, where oxidation is a major concern. In edible oils and fats, the antioxidant helps maintain oxidative stability during storage and handling, reducing the risk of rancid flavors that can develop over time. Foods such as margarine, spreads, and baking fats benefit from the inclusion of ANOXOMER, as these products often undergo prolonged storage before consumption. In baked goods and snack foods that contain fat, ANOXOMER can play a role in preserving quality by slowing the breakdown of unsaturated fatty components. Its function is particularly valuable in products that are exposed to oxygen during processing and packaging, where oxidative reactions can be accelerated. Similarly, in dressings and sauces with oil components, the antioxidant activity contributes to flavor stability and shelf life. The use of ANOXOMER is determined by its regulatory approval and specific formulation needs. In the United States, its permitted use and maximum levels are defined by regulation, ensuring that inclusion in food products is both functional and compliant with safety standards. By helping to maintain product integrity, ANOXOMER supports consumer expectations for taste, freshness, and quality across a range of processed food categories.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 172.105
EFSA
- Notes: EFSA approval status not found in available authoritative sources
JECFA
- Notes: Year not explicitly shown on the available JECFA evaluation summary
- Ins Number: 323
- Adi Display: 0-8 mg/kg bw
- Adi Mg Per Kg: 8
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