FD&C RED NO. 40
FD&C Red No. 40 is a synthetic red monoazo dye permitted as a certified color additive in foods and other products, widely used to impart red color.
What It Is
FD&C Red No. 40 is a synthetic red color additive used in foods and other consumer products. It is a monoazo dye whose primary function in formulations is to provide a stable red color and complementary sensory qualities. In regulatory terms, it is listed in the U.S. Code of Federal Regulations as a permitted color additive subject to certification and must meet identity and specification criteria to ensure purity and composition. Different salts of this compound, such as the sodium salt and aluminum lakes, may be used in various applications. FD&C Red No. 40 is also identified by other names including C.I. 16035 and Food Red 17, reflecting its classification in color index systems used by industry and regulators. Furthermore, it serves additional technical roles such as acting as a flavor adjunct in some specialized formulations where color and visual appeal are intertwined with product identity. The monoazo structure of FD&C Red No. 40 means it contains an azo (-N=N-) linkage connecting aromatic rings with sulfonate substituents, contributing to its chromatic properties and solubility in water-based systems. In the context of food and beverage systems, the red hue imparted by FD&C Red No. 40 ranges from bright red to darker shades depending on concentration and matrix interactions. This characteristic underpinning of the additive has made it one of the most widely used synthetic red colorants globally, particularly in processed foods and confections where vibrant color is part of consumer expectation and product positioning. While primarily recognized for its coloring function, FD&C Red No. 40’s categorization in regulatory texts encompasses its certification requirements, maximum permitted uses, and specifications. These standards serve to ensure that the material used in commerce meets rigorous criteria for identity and purity, which in turn is intended to support consistent performance and regulatory compliance across food, drug, and cosmetic uses.
How It Is Made
FD&C Red No. 40 is manufactured through controlled chemical synthesis involving the coupling of aromatic intermediates to form a monoazo dye. This process typically begins with the diazotization of a substituted aromatic amine, followed by its coupling with a naphthalenesulfonate intermediate under acidic conditions. The resulting azo compound is isolated and purified as a disodium salt suitable for commercial use as a color additive. The manufacturing route yields a highly colored compound with sulfonate groups that confer water solubility, which is essential for many food and beverage applications. After synthesis, the final product undergoes purification steps to remove unreacted intermediates and impurities, ensuring that it conforms to regulatory specifications for identity and purity. These specifications, defined in regulatory texts, set minimum thresholds for the principal coloring matter and maximum allowances for volatile matter and other constituents to ensure consistency and safety in its intended uses. Turndown processes such as conversion to aluminum lakes involve precipitating the dye with aluminum compounds to produce pigment forms that are suitable for use in fat-based and confectionery systems. This transformation expands the functional utility of FD&C Red No. 40 beyond soluble applications, allowing formulators flexibility when the food matrix requires a nonaqueous or solid-phase colorant. Throughout production and subsequent handling, manufacturers apply current good manufacturing practices to maintain quality and compliance with regulatory requirements.
Why It Is Used In Food
FD&C Red No. 40 is used in foods fundamentally to provide a red color that would otherwise be absent or insufficient in the base ingredients. Color plays an important role in consumer perception, helping to identify product type, indicate flavor expectations, and enhance overall appeal. For manufacturers, the use of FD&C Red No. 40 enables precise control over color intensity and hue, making it suitable for products that rely on visual cues to communicate quality and flavor attributes. In addition to its coloring function, FD&C Red No. 40 may be used in combination with other additives to achieve specific aesthetic effects, such as stabilizing a desired shade over the product’s shelf life or complementing other sensory attributes. In some formulations, color is tied to branding and consumer recognition, meaning that consistent performance from batch to batch is a key technological requirement. Because FD&C Red No. 40 dissolves readily in water and forms stable solutions or dispersions in many food matrices, it is compatible with a broad range of products including beverages, confections, and dairy desserts. Its relative stability to light and processing conditions, within the constraints of good formulation practice, makes it a practical choice for foods that undergo typical manufacturing stresses such as mixing, heating, and storage. The combination of reliable color performance, regulatory acceptance in many jurisdictions, and formulation flexibility underpin its widespread use in the food industry.
Adi Example Calculation
To illustrate how an acceptable daily intake (ADI) might be interpreted, consider a hypothetical body weight of 70 kilograms. If an additive’s established ADI is defined as an upper safety range value, a person weighing 70 kg could theoretically consume that amount multiplied by their body weight without exceeding the ADI. In this example, multiplying the upper bound by body weight yields a daily intake threshold in milligrams, helping contextualize the amount relative to typical food consumption patterns. Such calculations are intended to provide a frame of reference for understanding exposure relative to established safety benchmarks. However, this calculation is illustrative and not an individualized recommendation. Actual intake will vary based on diet, frequency of consumption of products containing the additive, and individual metabolism. Regulatory exposure assessments use population-level data to estimate typical and high-end intakes across demographic groups, ensuring that use levels in food categories remain consistent with safe exposure thresholds. Ultimately, these frameworks guide food safety policies and inform industry formulation decisions.
Safety And Health Research
Regulatory bodies and scientific committees have reviewed the toxicological data on FD&C Red No. 40/Allura Red AC as part of broader safety evaluations of synthetic color additives. For instance, the Joint FAO/WHO Expert Committee on Food Additives has examined dietary exposure and toxicological studies, concluding that exposures are generally below levels of concern when used within permitted limits. This committee’s assessment reflects comprehensive examination of genotoxicity, subchronic toxicity, and long-term studies as part of its evaluation of monoazo dyes. Similarly, the European Food Safety Authority conducted a re-evaluation of Allura Red AC as E129, taking into account various toxicity studies and exposure data. In that context, the scientific panel reviewed evidence including genotoxicity assays, carcinogenicity studies, and dietary exposure estimates, concluding that the database did not warrant revision of the previously established acceptable daily intake range. These assessments are rooted in peer-reviewed scientific evidence and align with risk assessment frameworks that consider both hazard identification and exposure. Regulatory safety assessments focus on ensuring that use levels in foods, beverages, and other products do not exceed thresholds deemed safe based on animal studies and exposure estimates. While discussions about consumer outcomes occasionally appear in scientific literature, authoritative bodies continue to base regulatory evaluations on systematic review of toxicological evidence and exposure data rather than isolated findings. This approach is consistent with internationally recognized risk assessment principles applied to food additives.
Regulatory Status Worldwide
In the United States, FD&C Red No. 40 is listed in the Code of Federal Regulations as a permitted synthetic color additive subject to batch certification and must conform to identity and specification criteria set forth in sections of Title 21 CFR Part 74. For example, regulations detail the specifications that material must meet and the certification requirements for batches before they may be used in foods, drugs, or cosmetics. The presence of listings such as 21 CFR 74.1340, 74.2340, and 74.340 signifies its regulated status for coloring drugs, cosmetics, and foods respectively, although these regulations do not provide explicit numerical use limits but rather frameworks for compliant use. Authorities require that only diluents listed in the applicable sections of Part 73 be included in mixtures intended for food use, and that color additive lakes and mixtures meet defined specifications and labeling requirements. Internationally, FD&C Red No. 40 corresponds to the additive commonly known as Allura Red AC and is included in many countries’ food additive schedules. In the European Union, it is assigned the E number E129 and is permitted for use within defined food categories under EU food additive regulations, which include maximum permitted levels tailored to specific product types. This reflects a regional regulatory framework that balances consumer protection with broad technological use across multiple food categories. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has also evaluated Allura Red AC and confirmed a range of safe exposure levels based on dietary intake data and toxicological evidence, providing a basis for regulatory decisions in many jurisdictions. Overall, the worldwide regulatory landscape for FD&C Red No. 40/Allura Red AC reflects careful assessment of its safety and functional utility, leading to its continued acceptance where permitted.
Taste And Functional Properties
FD&C Red No. 40 is primarily valued for its visual effect rather than taste, as it contributes color without imparting a distinct flavor. In most applications, its influence on sensory perception is limited to visual cues that can shape consumer expectations; it does not meaningfully alter the taste profile of the finished product when used at typical levels. Functionally, FD&C Red No. 40 is highly soluble in water, which allows it to disperse evenly in aqueous-food systems such as beverages, gels, and dairy products. This solubility supports uniform color distribution, which is important for consistent appearance and product quality. When used in emulsified or low-moisture systems, it may be formulated as a lake pigment to achieve the desired effect in a less soluble form, extending its utility across different food types. From a stability perspective, the color imparted by FD&C Red No. 40 is generally resilient under normal processing conditions. While extreme pH or prolonged exposure to high heat can affect the chromatic intensity, in most commercial food processing environments the additive maintains its coloring function. Formulators often consider these characteristics when selecting FD&C Red No. 40, balancing desired appearance with the requirements of the specific food matrix and processing conditions.
Acceptable Daily Intake Explained
The acceptable daily intake (ADI) for a food additive represents the amount that can be consumed every day over a lifetime without appreciable health risk according to international expert evaluations. For Allura Red AC/FD&C Red No. 40, evaluations by expert committees have established an ADI expressed as a range, which reflects the upper bound of consumption considered safe when factoring in uncertainty and variability in toxicological data. The ADI is derived from controlled studies where effects are monitored across different dosages, with a safety factor applied to account for uncertainties and ensure protection across populations. When regulators assign an ADI, they aim to provide a benchmark for exposure that accounts for typical dietary intake patterns in populations, helping guide regulatory limits and industry use practices. It is important to emphasize that the ADI is not a recommended target for intake but rather a safety benchmark. Daily exposures below the ADI are expected to pose no appreciable health risk, while sustained exposure above the ADI would prompt reevaluation by regulatory authorities. For consumers, typical intake of FD&C Red No. 40 from foods and beverages is generally below regulatory exposure estimates due to the relatively low concentrations used in products and the diverse sources of dietary colorants.
Comparison With Similar Additives
FD&C Red No. 40 belongs to the class of synthetic azo dyes, a group that includes other commonly used color additives such as FD&C Yellow No. 5 and FD&C Blue No. 1. Compared with some natural colorants like beet red or carmine, synthetic azo dyes offer intense color at low use levels and high stability in diverse processing conditions, which influences formulators’ choice when vibrant, consistent hues are needed. Within the synthetic azo class, FD&C Red No. 40 is often chosen for red hues due to its solubility and regulatory acceptance in many regions. By contrast, other synthetic colors such as Tartrazine (FD&C Yellow No. 5) provide yellow shades and have their own regulatory limits and safety evaluations. These additives share functional properties related to color delivery but differ in application constraints and perception based on the hue they provide. Synthetic blues like FD&C Blue No. 1 are typically selected for products where green or purple tones are desired, illustrating how chemical structure and chromatic properties guide use in formulation. When comparing across these additives, regulatory status, stability in specific food matrices, and consumer acceptance all inform selection and use.
Common Food Applications Narrative
FD&C Red No. 40 is widely used as a coloring agent in many processed foods where red hues are desired. Its applications include beverages, confections, bakery products, frostings, dessert gels, dairy-based treats, and snack foods where a defined red color contributes to product identity and visual appeal. In beverage applications, the dye helps achieve bright and consistent coloring that can range from light pink to deep red depending on concentration and matrix interactions. Confectionery products such as candies, gummies, and icings also benefit from FD&C Red No. 40’s ability to deliver vibrant and stable red tones that remain consistent during storage and handling. In bakery and dessert contexts, the color additive can be used in frostings, glazes, and decorative icings where red shades are needed to match flavor profiles or seasonal themes. Dairy-based desserts like sherbets or flavored yogurts may incorporate FD&C Red No. 40 to enhance the expected color associated with fruit flavors or to achieve uniformity across batches. Snack items and cereals sometimes include the additive to provide visual cues tied to specific flavors or character branding, helping products stand out on retail shelves. Manufacturers choose FD&C Red No. 40 for these applications because of its capacity to impart intense color at relatively low use levels, its solubility in diverse food formulations, and its regulatory recognition in jurisdictions where it is permitted. These attributes make it a practical and frequently selected choice for foods seeking a consistent red appearance without altering taste or texture.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 74.340
EFSA
- Approved: True
- E Number: E129
- Adi Display: 0-7 mg/kg bw
- Adi Mg Per Kg: 7
JECFA
- Year: 2016
- Ins Number: 129
- Adi Display: 0-7 mg/kg bw
- Adi Mg Per Kg: 7
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