FD&C BLUE NO. 1

CAS: 3844-45-9 COLOR OR COLORING ADJUNCT, FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

FD&C Blue No. 1, also known as Brilliant Blue FCF and CI Acid Blue 9, is a synthetic blue food dye used to color foods, beverages, and other products according to regulatory standards.

What It Is

FD&C Blue No. 1 is a synthetic colour additive primarily used to impart vibrant blue hues in a wide variety of food and beverage products. It is part of the class of triarylmethane dyes, which are organic compounds characterized by their three aromatic rings bound around a central methane carbon. This compound is identified by the Chemical Abstracts Service Registry Number 3844-45-9 and has an assigned International Numbering System (INS) number of 133. Regulators and industry may refer to the substance by several names including Brilliant Blue FCF, CI Acid Blue 9, Food Blue 2, and other synonyms listed in the other_names field above. The term "FD&C" signifies that the additive has been evaluated and considered for use in foods, drugs, and cosmetics in the United States, subject to the specific regulations codified by the U.S. Food and Drug Administration. As a colouring adjunct, it is used to enhance or provide blue colour where natural pigments are unavailable or unstable. Its inclusion in food and beverage formulations is guided by regulatory approval and good manufacturing practice principles.

How It Is Made

The production of FD&C Blue No. 1 involves chemical synthesis from petroleum-derived raw materials. Specifically, this triarylmethane dye is formed through condensation reactions between sulfonated benzaldehyde and appropriate aromatic amines, followed by controlled oxidation to yield the characteristic chromophore structure. The resulting compound is typically isolated as its disodium salt form, which improves solubility in aqueous systems used in food and beverage applications. In industrial practice, the synthesis route, purification, and final form must meet established purity criteria and specifications to ensure food-grade quality. Manufacturers are required to adhere to identity, impurity, and heavy metal limits as stipulated by regulatory specifications to minimise contamination risks. The disodium salt form is most common, but other salt forms such as aluminium lakes may be produced for use in products with lower water content. The overall manufacturing process is designed to yield a chemically defined substance that meets internationally recognised specifications for food additives.

Why It Is Used In Food

FD&C Blue No. 1 is used in foods to provide a stable and intense blue coloration that cannot be easily achieved with many natural colourants. Food producers often rely on synthetic colour additives like this one because they offer predictable performance, consistency from batch to batch, and compatibility with a wide range of formulations. The colour can make products more visually appealing and can help differentiate flavours and product categories at the point of sale. In addition, blue hues are uncommon in natural food ingredients, making synthetic dyes valuable in achieving certain aesthetic goals without relying on blends of multiple natural pigments that may have variable stability. The additive is formulated to disperse uniformly in liquids and solids, and its use levels are determined based on achieving the desired shade without exceeding regulatory good manufacturing practice guidelines. Beyond aesthetic appeal, consistent colouration can influence consumer perception of quality, flavour, and freshness, which is an important aspect of food marketing and product development.

Adi Example Calculation

An illustrative calculation using an example ADI can help clarify how this concept applies in practice. Suppose an ADI of 6 mg per kilogram of body weight per day has been established by a regulatory authority for FD&C Blue No. 1. For an adult weighing 70 kilograms, the theoretical maximum acceptable daily intake would be calculated as 6 mg/kg times 70 kg, which equals 420 mg per day. This example is not a recommendation but serves to illustrate how ADI scales with body weight. Regulatory bodies consider typical consumption patterns across different age groups and food categories to ensure that the cumulative intake from all foods containing the additive remains below this threshold. Intake estimates that account for high-percentile consumption scenarios help determine whether current usage levels remain compatible with established safety limits.

Safety And Health Research

Safety evaluations of FD&C Blue No. 1 have been conducted by major regulatory bodies such as JECFA and EFSA, involving assessments of toxicological endpoints including subchronic and chronic toxicity, genotoxicity, and absorption, distribution, metabolism, and excretion. These evaluations review available scientific studies to determine whether typical dietary exposures fall within established safety parameters. The compound is poorly absorbed from the gastrointestinal tract and largely excreted unchanged, which has informed risk assessments. Findings from long-term animal studies have helped identify no-observed-adverse-effect levels (NOAELs) used in establishing acceptable daily intake ranges. As a result of these reviews, regulatory authorities have concluded that under specified conditions of use, dietary exposure to this additive does not present a health concern across age groups when consumption remains below the established ADI. Ongoing research continues to inform regulatory perspectives, and evaluations are periodically updated in response to newly submitted data or advances in toxicological methods.

Regulatory Status Worldwide

In the United States, FD&C Blue No. 1 is listed as a colour additive subject to certification under Title 21 of the Code of Federal Regulations. The eCFR details specific sections that govern its use in foods and other products; for example, 21 CFR 74.101 outlines conditions for food use including limitations to good manufacturing practice, and other sections such as 74.1101 and 74.2101 address drugs and cosmetics. This listing means that all batches must be certified by the U.S. Food and Drug Administration before marketing, and manufacturers must adhere to identity and purity requirements specified in the regulations. In the European Union, the additive is known by its E number E133 and has been evaluated by the European Food Safety Authority, which established an acceptable daily intake (ADI) based on toxicological data. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has also evaluated the compound and set an upper limit for ADI based on long-term studies. Worldwide, its use is permitted in many jurisdictions where regulatory frameworks recognise synthetic colour additives, provided that maximum permitted levels and purity criteria are met. Regulatory status continues to evolve as authorities periodically reassess scientific evidence and monitor consumption patterns.

Taste And Functional Properties

FD&C Blue No. 1 itself does not contribute a perceptible flavour to food products. Its primary role is visual, and when formulated correctly, it should not impact the taste profile of the final product. As a functional colourant, it exhibits high solubility in water, which allows it to disperse evenly in aqueous food systems such as beverages, gelatin desserts, and frostings. Stability under typical processing conditions including heat, varying pH levels, and light exposure is generally sufficient for most applications, though like many synthetic dyes, prolonged exposure to extreme conditions can affect colour intensity. The additive’s behaviour in complex formulations also depends on the presence of other ingredients which might interact with colour intensity or stability, such as acids, sugars, and preservatives. Because it does not contribute flavour or nutritional value, FD&C Blue No. 1 is used when the sole objective is to achieve a specific visual effect without altering the sensory experience of taste and aroma.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) is a key component of food additive safety assessment. ADI represents an estimate of the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on available toxicological data and the application of uncertainty factors to account for variability between individuals and species. For FD&C Blue No. 1, regulatory bodies such as JECFA and EFSA have evaluated data from long-term toxicity studies in laboratory animals to identify dose levels without adverse effects. Applying uncertainty factors to these data allows scientists to derive an ADI that reflects a conservative estimate of safe exposure. ADI is intentionally set well below levels at which effects were observed in controlled studies to build a margin of safety. It is important for consumers and professionals to understand that ADI is not a recommended intake level but a regulatory threshold that guides safe use levels in food products. Adherence to the ADI ensures that daily intake from all dietary sources remains within a range considered acceptable by scientific consensus.

Comparison With Similar Additives

FD&C Blue No. 1 can be compared with other synthetic colour additives such as FD&C Red No. 40, FD&C Yellow No. 5, and FD&C Green No. 3. All are used to impart distinct hues to food products and are subject to regulatory evaluation and approval. FD&C Red No. 40 is widely used for red to pink hues, while FD&C Yellow No. 5 provides yellow colouring, and FD&C Green No. 3 delivers green tones. Each additive has its own ADI and stability characteristics; for example, some may vary in heat or pH stability, influencing their suitability in specific formulations. Regulatory frameworks treat each colour additive individually, assessing safety and permitted uses based on available data. While all serve similar functional purposes in enhancing visual appeal, differences in chemical structure and colour profile inform their selection in product development. Choosing among them often depends on the desired colour outcome and regulatory compatibility with the target market.

Common Food Applications Narrative

FD&C Blue No. 1 is a widely used colour additive in various food categories where a blue hue is desired or where colour consistency is important. It is found in beverages including soft drinks, sports drinks, and flavoured waters that utilise bright blue or aqua colour profiles. In confections, the dye colours candies, chewing gum, icing, and frosting, as well as decorative elements on baked goods. Frozen desserts such as ice pops, sherbets, and novelty treats often rely on this dye to create visually striking products that attract consumer attention. The additive also appears in dairy products such as flavoured milk drinks and yogurts where blue tones are used for thematic branding or limited edition flavours. Beyond traditional food and beverage products, FD&C Blue No. 1 can be included in the colour palettes of gelatin-based desserts, breakfast cereals, and snack coatings to maintain a consistent visual identity across product lines. While its primary role is aesthetic, the use of the dye must always align with regulatory guidelines and good manufacturing practice to ensure that product labelling accurately reflects its presence. Across global markets where regulations permit its use, it serves as a reliable and consistent colourant that contributes to product appeal while complying with safety and quality standards.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 74.101

EFSA

  • Approved: True
  • E Number: E133
  • Adi Display: 0-6 mg/kg bw
  • Adi Mg Per Kg: 6

JECFA

  • Notes: Year not explicitly shown on the d JECFA page
  • Ins Number: 133
  • Adi Display: 0-6 mg/kg bw
  • Adi Mg Per Kg: 6

Sources

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