2-BUTYLFURAN

CAS: 4466-24-4 FLAVORING AGENT OR ADJUVANT

2‑BUTYLFURAN is a heterocyclic organic compound used in the flavor and fragrance industry with a spicy aroma profile, identified by CAS 4466‑24‑4.

What It Is

2‑BUTYLFURAN is an organic heterocyclic compound belonging to the class of furans in which a butyl side chain is substituted at the 2‑position of the furan ring. It is identified by the CAS Number 4466‑24‑4 and appears as a colorless liquid with a medium strength spicy aroma that contributes aromatic notes in various natural products and flavor formulations. Chemically, it is composed of eight carbon atoms and one oxygen atom arranged in a five‑membered furan ring with an attached butyl chain. In flavor sciences, this compound is recognized for its olfactory impact and is listed under flavor identifiers such as FEMA 4081 and JECFA 1490 indicating its evaluation in flavor additive inventories. While it occurs naturally in some foods and beverages, in the context of food formulation it is used deliberately to impart flavor. The presence of a substituted furan ring gives 2‑BUTYLFURAN its characteristic scent qualities compared to other simple furans. From an industrial perspective, 2‑BUTYLFURAN may also serve as an intermediate in organic synthesis outside the food sector, but its primary designation in food ingredient contexts is as a flavoring agent or adjuvant.

How It Is Made

The synthesis of 2‑BUTYLFURAN typically involves the chemical functionalization of furan, a five‑membered aromatic heterocycle, with a butyl side chain at the 2‑position. This can be achieved through catalytic alkylation processes where an appropriate butyl donor reagent is reacted with furan under controlled conditions, often using acid catalysts to facilitate substitution. In commercial settings, manufacturers producing 2‑BUTYLFURAN for flavor use will refine the resulting reaction mixture to achieve high purity, generally using techniques such as distillation and chromatography. Specifications for purity, residual solvents, and impurity profiles are established by suppliers to ensure consistency and safety for intended applications. While detailed proprietary methods vary between producers, the overarching goal in manufacture is to achieve a product that meets flavor industry quality standards, minimizing by‑products that could alter sensory characteristics or introduce undesired effects. Safety data sheets from chemical suppliers characterize the compound’s properties and handling requirements, emphasizing its classification as a combustible liquid with specific storage and handling recommendations.

Why It Is Used In Food

Food formulators use 2‑BUTYLFURAN as a flavoring agent because of its ability to contribute spicy and complex aromatic notes that can enhance the sensory profile of food and beverage products. In many natural foods and cooked products, trace levels of substituted furans like 2‑BUTYLFURAN contribute to the characteristic aroma that consumers associate with particular flavor profiles. In formulated foods, the addition of 2‑BUTYLFURAN allows flavorists to fine‑tune aroma programs to achieve a desired overall impression, especially in savory, roasted, or fermented flavor categories. Its compatibility with other flavoring substances and its volatility profile make it suitable for use in applications from beverages to snack seasonings where a specific olfactory impact is sought. The technical function as a flavoring agent or adjuvant reflects its role in modulating and enhancing flavors rather than contributing nutritional value. It serves as part of the complex mixture of compounds that form modern flavor formulations, aiding in achieving consistency and depth in product flavor.

Adi Example Calculation

Because there is no authoritative acceptable daily intake (ADI) numeric value established for 2‑BUTYLFURAN by major regulatory bodies, an illustrative calculation using a hypothetical ADI cannot be presented. The absence of a defined ADI reflects the current state of safety evaluation for this compound based on available data.

Safety And Health Research

Safety evaluations of flavoring agents like 2‑BUTYLFURAN consider toxicological endpoints including general toxicity, genotoxicity, metabolic fate, and structure‑activity relationships. The available expert committee evaluations highlight concerns about the potential for members of this class of substituted furans to form reactive metabolites under physiological conditions, and note that data gaps, particularly in vivo genotoxicity and comprehensive carcinogenicity studies, limited the ability to complete a full safety procedure evaluation. Because of these considerations, authoritative bodies may recommend that use levels be kept to the minimum necessary to achieve the intended flavor effect. Regulatory inventories that index flavoring substances do so with the understanding that these substances are used at very low concentrations in food products, and safety assessments factor in typical exposure levels compared to toxicological data. Where explicit quantitative risk assessments are not established, the industry relies on expert evaluations and established flavor ingredient libraries to guide safe use conditions, and formulators adhere to good manufacturing practices to avoid excessive concentrations that could lead to unwarranted exposure.

Regulatory Status Worldwide

2‑BUTYLFURAN appears in food additive inventories and flavor registries that are referenced by regulatory bodies and industry groups globally. For example, it is listed in the Flavor and Extract Manufacturers Association (FEMA) flavor library under FEMA Number 4081, indicating its recognition as a flavoring substance evaluated for use in foods. This listing provides a basis for inclusion in inventories such as the U.S. FDA Substances Added to Food inventory, where flavoring substances evaluated by FEMA and JECFA are indexed. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) assigned a JECFA Number 1490 to 2‑BUTYLFURAN; however, JECFA’s evaluation concluded that the standard Procedure for Safety Evaluation of Flavouring Agents could not be applied due to unresolved toxicological concerns related to the structural class and limited in vivo toxicity data, including genotoxicity endpoints. As a result, no numerical acceptable daily intake (ADI) was established by JECFA for this compound. In the United States, inclusion in the FDA’s Substances Added to Food inventory reflects recognition of its use as a flavoring agent but does not equate to an affirmative direct additive approval under specific CFR sections. Instead, flavoring use is subject to principles of good manufacturing practice and inventory listing.

Taste And Functional Properties

2‑BUTYLFURAN is noted for its spicy, somewhat roasted aroma with medium odor strength. These sensory properties make it useful in creating specific flavor profiles where such notes are desirable. The compound’s volatility means it can be perceived in the headspace of flavored products, contributing to initial aroma impressions. Functionally, substituted furans like 2‑BUTYLFURAN are incorporated into flavor systems at low concentrations, typically in the parts per million range, to achieve the desired sensory effect without overpowering other components. Its solubility profile—moderately soluble in some organic solvents but limited in water—guides how it is formulated into aqueous food systems; often it is pre‑dissolved in suitable carriers or incorporated into encapsulated flavor delivery systems. Heat stability and pH sensitivity are practical considerations in application. Although many flavoring compounds undergo transformation during high‑temperature processing, formulating experts choose levels and combinations to maintain sensory integrity through processing and shelf life. In general, 2‑BUTYLFURAN’s functional behavior in food systems aligns with its chemical nature as a flavor compound designed to support sensory quality.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory benchmark representing the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on available toxicological data. For many food additives, ADIs are derived from animal studies by identifying a no observed adverse effect level (NOAEL) and applying safety factors. In the case of 2‑BUTYLFURAN, a formal numerical ADI has not been established by international expert bodies because standard evaluation procedures could not be applied due to limited toxicological data, particularly in vivo studies and concerns about potential genotoxic mechanisms associated with substituted furan compounds. Without sufficient data to derive a point of departure and safety factors, regulatory bodies refrain from assigning a specific ADI value for this compound.

Comparison With Similar Additives

2‑BUTYLFURAN shares functional characteristics with other substituted furan flavor compounds that contribute aromatic notes in food formulations, such as furfuryl alcohol and 2‑methylfuran. These compounds are used for their distinctive sensory profiles, supporting roasted, sweet, or spicy characteristics depending on substitution patterns. Compared with simpler furans like furfuryl alcohol, 2‑BUTYLFURAN has a longer alkyl side chain, which typically influences volatility and odor character. In contrast, small aldehydic flavorants like vanillin or ethyl butyrate have very different sensory impacts and generally possess more extensive safety data leading to established ADIs. Flavorists select these compounds based on the desired balance of aroma intensity, compatibility with other ingredients, and regulatory status. Without an established ADI for 2‑BUTYLFURAN, its use is considered within flavor inventories and expert panel assessments under good manufacturing practice rather than direct additive authorizations with quantitative intake guidance.

Common Food Applications Narrative

In consumer foods, flavor compounds like 2‑BUTYLFURAN are part of the broader palette that flavorists use to evoke specific taste and aroma experiences. Because of its spicy and roasted aromatic character, it may be found in flavor formulations aimed at enhancing savory notes or adding complexity to products such as snack seasonings, sauces, and prepared meal components. These applications leverage its olfactory contribution rather than its taste in isolation. Beverages such as roasted coffee blends or tea infusions may include complex mixtures containing substituted furans to emulate characteristic aroma profiles, where 2‑BUTYLFURAN is one contributor among many volatile compounds. Similarly, in baked goods and confectionery, carefully balanced flavor blends may incorporate this compound at low levels to support desirable sensory impressions. The use of 2‑BUTYLFURAN in food formulations is guided by principles of good manufacturing practice, where the compound is selected and dosed to achieve targeted sensory performance without introducing off‑notes or undesirable interactions with other flavor ingredients. In all cases, its inclusion complements the broader strategy of achieving a consistent and appealing product aroma and flavor.

Safety & Regulations

EFSA

  • Notes: No EFSA numerical ADI available due to limited authoritative safety evaluations.

JECFA

  • Notes: JECFA evaluation did not result in a numerical ADI because standard procedure could not be applied.

Sources

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