BUTYL BETA-NAPHTHYL ETHER

CAS: 10484-56-7 FLAVORING AGENT OR ADJUVANT

Butyl beta-naphthyl ether (CAS 10484-56-7) is a chemical compound used as a flavoring agent in food formulations. It has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives with regard to safety when used at intended levels in food products.

What It Is

Butyl beta-naphthyl ether is a chemical compound identified by the CAS number 10484-56-7 and used primarily as a flavoring agent or adjuvant in food products and flavor formulations. It is also known under several synonyms including 2-butoxynaphthalene and beta-naphthol butyl ether, which reference the structural features of the molecule consisting of a naphthalene ring bonded to a butoxy group. The compound falls within the broader class of aromatic ethers and is typically encountered in research and industrial settings as a defined chemical substance. As a flavoring agent, its role is to contribute to or amplify sensory perception in food and beverage applications by imparting specific aromatic characteristics derived from its molecular structure. The compound is recognized within flavor and fragrance circles for its sensory profile and technical utility in enhancing flavor formulations. Most commonly d in regulatory and scientific databases, Butyl beta-naphthyl ether has been subject to safety evaluation by international scientific panels such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA), underscoring its classification within the flavoring agent functional group. The evaluation context and its technical function highlight its specific role in food science and flavor chemistry, distinguishing it from other chemical classes such as preservatives or colorants. While this compound has industrial and research uses outside of food flavoring, for the purposes of ingredient reference and regulatory context, its designation as a flavoring agent or adjuvant positions it within food science lexicons and regulatory frameworks related to additives and sensory enhancement.

How It Is Made

The synthesis of Butyl beta-naphthyl ether typically involves standard ether formation reactions employed in organic chemistry. One commonly referenced approach is the Williamson ether synthesis, in which a naphthol derivative (such as 2-naphthol) is converted to a reactive alkoxide and then coupled with an alkyl halide like 1-bromobutane under basic conditions to form the corresponding ether bond. This method is well understood in synthetic chemistry and is used widely to produce a range of ether compounds at varying scales for research and industrial applications. Descriptions of structural and physicochemical properties, including molecular formula (C14H16O) and identity information, support the synthetic context of this compound. Manufacturers aiming for use in flavor formulations must also consider purity and impurity profiles, though specific food-grade specifications are governed by international committees such as JECFA. While commercial suppliers provide this compound at typical analytical or research purity levels, its preparation for food-grade use may involve additional purification steps to ensure compliance with technical specifications set by regulatory bodies. That said, the detailed synthesis and manufacturing protocols are generally proprietary and vary by manufacturer, but they derive from documented organic chemistry methodologies that emphasize the formation of the butoxy-naphthyl ether linkage. In industrial practice, quality control measures include characterization by analytical methods such as NMR or chromatographic techniques to verify identity and assess purity. These analyses ensure consistency with defined chemical specifications and support safe usage in formulation contexts. Overall, the preparation of Butyl beta-naphthyl ether rests on established chemical synthesis principles that translate from laboratory scale to larger-scale production when required.

Why It Is Used In Food

Butyl beta-naphthyl ether is used in food and beverage formulation primarily because of its ability to contribute to desirable sensory characteristics. As a flavoring agent, compounds in this class interact with olfactory receptors at low concentrations, enhancing or modifying taste and aroma profiles. Flavoring agents such as this are chosen for their specific aromatic contributions, whether to bolster fruity, floral, or other sensory cues in complex flavor mixtures. The technical designation "flavoring agent or adjuvant" reflects both its function in delivering sensory impact and its role in assisting overall flavor balance. Flavoring agents are important components of many processed foods and beverages because they help deliver consistent taste experiences across batches and products. Butyl beta-naphthyl ether and structurally related compounds may be selected by flavor chemists for target notes that align with product positioning, whether enhancing sweetness perception or complementing other aromatic ingredients. Its use is governed by flavor formulation expertise and sensory evaluation rather than primary nutritional rationale, and such ingredients are often present at trace levels that do not contribute measurable caloric value. The context of use in food industry formulations is generally in synergy with other flavor compounds, where a balance of volatile and semi-volatile molecules contributes to the overall sensory profile. Butyl beta-naphthyl ether’s specific functional utility in blending and sensory design underlies its inclusion in certain flavor libraries and technical references. It is not a bulk ingredient but rather a component of nuanced flavor engineering, supporting the broader goal of creating appealing sensory attributes in consumer food products.

Adi Example Calculation

Because Butyl beta-naphthyl ether does not have a specific numeric ADI assigned by JECFA or other regulatory bodies, an illustrative calculation using an ADI cannot be provided. Instead, safety conclusions for flavoring agents like this are based on expected low exposure levels from intended use, which expert panels judge as not raising safety concerns. This type of qualitative safety assessment reflects typical regulatory practice for many flavoring compounds where detailed toxicological data and exposure estimates indicate minimal risk at levels used in food products. In general, when a numeric ADI exists for a food additive, illustrative calculations involve multiplying the ADI value by body weight (for example, in mg per kg body weight per day) to estimate a threshold below which intake is considered safe. However, in the absence of a numeric ADI for this compound, regulatory guidance centers on expert judgments about safety at current use levels rather than specific daily exposure thresholds.

Safety And Health Research

Safety evaluations for Butyl beta-naphthyl ether have focused on its use as a flavoring agent in foods. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed the compound in 2012 and concluded that there is no safety concern at expected levels of intake from flavoring use. This type of expert review examines toxicological data, potential exposure levels, and structural analog information to judge whether typical intake poses risk to human health, rather than establishing prescriptive numeric thresholds. Such evaluations often consider data on absorption, metabolism, and toxicity endpoints where available, recognizing that many flavoring agents are present at trace levels. Regulatory assessments for flavoring substances also rely on principles such as the threshold of toxicological concern (TTC) for compounds with limited specific toxicity data, integrating available evidence to estimate safe exposure. In its function as a defined flavoring agent, Butyl beta-naphthyl ether is contextualized within categories of compounds that have been historically used at low levels without documented adverse health outcomes in humans. Nevertheless, data gaps may remain for certain endpoints, such as long-term chronic exposure studies or reproductive toxicity data specific to this compound, as such detailed studies are not always required for substances with low expected exposure. Overall, safety research in regulatory contexts emphasizes expert evaluation of existing data and structural considerations to conclude that the intended use in flavoring does not raise health concerns. This approach is standard for many flavoring agents where exposure is minimal and supported by compositional and toxicological evidence reviewed by international panels.

Regulatory Status Worldwide

Butyl beta-naphthyl ether has been evaluated by international scientific bodies for safety in food flavoring contexts. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) assigned this compound the JECFA number 2141 and reviewed its safety in 2012, concluding that there is no safety concern at current levels of intake when used as a flavoring agent. This conclusion reflects a risk assessment considering typical exposure levels from intended uses rather than establishing a numeric acceptable daily intake (ADI), which is not specified for many flavoring agents evaluated under the JECFA flavoring program. The JECFA evaluation and function designation indicate a regulatory context in which safety assessment is tied to expert judgment on exposure and use patterns rather than prescriptive numeric limits. In the United States, this compound is listed in the FDA food substance inventory derived from the Flavor and Extract Manufacturers Association (FEMA) evaluations. FEMA assigns it a GRAS reference number, indicating expert panel consideration of safety under conditions of intended use as a flavoring agent. However, its listing does not equate to an explicit FDA regulation number such as a specific Code of Federal Regulations (CFR) section, and public FDA allowance status is not detailed in the available inventory excerpt. In the European Union context, there is no specific E-number identified for this compound in standard food additive lists, and regulatory evaluation typically references flavoring inventories and safety assessments rather than inclusion on the Union list of authorized food additives. Overall, regulatory status worldwide reflects expert panel evaluations and safety considerations specific to intended flavoring use.

Taste And Functional Properties

Butyl beta-naphthyl ether exhibits distinct organoleptic properties that make it useful as a flavoring agent. Descriptions in technical references characterize its aromatic profile as having floral, fruity, and sweet sensory notes, reflecting its potential contribution to flavor blends. These sensory qualities are a function of the compound’s structure and its interaction with olfactory receptors, which is why it may be featured in specialized flavor applications. As with many flavoring substances, its perception is highly concentration-dependent and typically evaluated by trained sensory panels or analytical profiling. Functionally, the physicochemical properties of Butyl beta-naphthyl ether influence how it behaves in complex food matrices. It is more soluble in non-polar solvents and fats than in water, which affects how it disperses in formulations such as emulsions or lipid-rich products. Its relative insolubility in water means it may be incorporated in food systems that leverage solvent carriers or emulsifiers to achieve uniform distribution. Additionally, its thermal stability and volatility characteristics determine its suitability for different processing conditions, including how it responds to heat during baking or pasteurization. Flavor chemists also consider stability under pH variations and storage conditions to ensure consistent sensory delivery over a product’s shelf life. While sensory descriptors provide a qualitative sense of taste and aroma contributions, functional behavior in formulation and processing is equally important for successful application. Overall, Butyl beta-naphthyl ether’s sensory attributes and functional properties support its use as a defined flavoring agent within complex mixtures where specific aromatic notes are desired.

Acceptable Daily Intake Explained

Acceptable daily intake (ADI) is a toxicological concept used by regulatory scientists to describe a level of daily exposure to a substance that is considered without appreciable risk over a lifetime. It is typically derived from toxicological studies in animals or humans, applying safety factors to account for variability between individuals and species. In the context of flavoring agents like Butyl beta-naphthyl ether, JECFA and other expert bodies may conclude there is no safety concern at current levels of intake based on exposure estimates and toxicological data, rather than establishing a specific numeric ADI. For many flavoring compounds, typical dietary exposure is very low compared to other food additives, and a qualitative conclusion of no safety concern can suffice where quantitative exposure assessments confirm minimal consumer intake. Thus, while the ADI concept provides a useful framework for comparing exposure to safety benchmarks, not all additives evaluated by expert committees have a numeric ADI assigned. In such cases, regulatory findings focusing on safety at current use levels provide guidance for industry and regulators alike, indicating that under customary conditions of use, potential intake is unlikely to pose risk. It is important to recognize that an ADI is not a recommended intake level but a regulatory tool to support safety assessment and risk management decisions.

Comparison With Similar Additives

Butyl beta-naphthyl ether can be compared with other flavoring agents that share functional roles in food formulations. For example, ethyl maltol is another aromatic compound used to impart sweet and caramel-like notes in confectionery and baked products; both compounds contribute sensory characteristics at trace levels but differ in their chemical structure and volatility profile. Similarly, vanillin, a well-known flavoring molecule, provides distinct vanilla notes and is broadly used across categories, illustrating how different flavoring agents are selected based on specific aromatic targets. In contrast to simple esters like ethyl butyrate, which deliver fruity notes with relatively high volatility, Butyl beta-naphthyl ether has a more complex aromatic ring structure that influences its receptor interactions and sensory impression. These comparisons underscore the diversity of flavoring agents available to formulators and how each is chosen for distinct sensory functions. While some flavoring additives have numeric ADIs or regulatory specifications linked to broader use permissions, the group of aromatic ethers evaluated primarily for flavor reflects a subset of compounds where expert panel safety conclusions guide use patterns without specifying quantitative intake limits.

Common Food Applications Narrative

Butyl beta-naphthyl ether, as a defined flavoring agent, finds its place in a range of food and beverage applications where nuanced aromatic profiles are desired. Food scientists and flavor formulators use such compounds in categories that benefit from floral or fruity sensory notes, adjusting blends to achieve targeted consumer taste perceptions. In practice, this means its inclusion in products such as confectionery, soft drinks, baked goods, dairy-based desserts, and confection coatings where subtle aromatic enhancement contributes to the overall taste experience. In beverage formulations, including non-alcoholic and ready-to-drink products, flavoring agents like Butyl beta-naphthyl ether are used to complement fruit-derived notes or to create balanced profiles in complex mixtures that might include sweet, sour, or citrus elements. Similarly, in confectionery and sweet bakery items, the compound can be part of flavor blends that enhance berry or floral character without overwhelming other ingredients. Its functional behavior in these matrixes reflects its compatibility with flavor carriers and formulation systems tailored to specific product categories. Moreover, in dairy-derived desserts or frozen products, this compound may be applied in concert with other volatile and semi-volatile molecules to craft distinctive sensory identities that resonate with consumer expectations. While not a primary ingredient, its nuanced contribution aids the flavor design process, allowing product developers to fine-tune final formulations. Its use follows industry practices for flavor addition, which generally involve trace-level incorporation based on expert sensory evaluation and regulatory compliance considerations.

Safety & Regulations

FDA

  • Notes: No specific CFR section for this compound’s food additive status was found in the FDA inventory; safety context comes from FEMA and JECFA evaluations.

EFSA

  • Notes: No specific EFSA E-number or numeric ADI could be verified for this compound.

JECFA

  • Year: 2012
  • Adi Display: No safety concern at current levels of intake when used as a flavouring agent

Sources

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