BUTYL FORMATE

CAS: 592-84-7 FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

Butyl formate is a synthetic flavoring substance with a fruity aroma used in food and beverage formulations. It is permitted in foods as a flavoring agent under FDA regulation 21 CFR 172.515 and has been evaluated by JECFA with no safety concerns at current levels of intake when used as a flavoring agent. JECFA assigned it the number 118 as a flavouring agent. The compound is a clear, colorless liquid with a fruity odor and is found naturally in some fruits and foods.

What It Is

Butyl formate is a chemical compound belonging to the ester class, specifically the butyl ester of formic acid. It is commonly used in food science and the flavor industry as a flavoring agent or flavor enhancer to impart or enhance fruity, plum-like notes in foods and beverages. With the CAS Registry Number 592-84-7, this compound is recognized under regulatory frameworks for food additives and flavoring agents. According to the Joint FAO/WHO Expert Committee on Food Additives (JECFA), butyl formate carries the JECFA number 118 for classification as a flavouring agent and has been evaluated as having no safety concern at current levels of intake when used in this capacity, reflecting an international scientific consensus on its safety under typical usage conditions. Additionally, it is listed under the U.S. Code of Federal Regulations at 21 CFR 172.515, where it is classified among substances permitted for direct addition to food as synthetic flavoring substances and adjuvants under the principle of good manufacturing practice. The compound can also occur naturally in foods such as apples, strawberries, and cheeses, contributing to their characteristic flavors.

How It Is Made

Butyl formate is typically synthesized through an esterification reaction involving formic acid and n-butanol under acidic conditions. This type of reaction is widely used in the chemical industry for producing esters that serve as flavoring agents or solvents. In this process, formic acid (the simplest carboxylic acid) reacts with the alcohol group of n-butanol in the presence of an acid catalyst, such as sulfuric acid, to form the ester bond along with water as a byproduct. After reaction completion, the mixture is often subjected to distillation to isolate and purify the butyl formate product at high purity levels, ensuring suitability for use in food flavor applications. Industrial production of butyl formate focuses on achieving food-grade quality by controlling reaction conditions, purification methods, and residual catalyst levels. Manufacturers typically aim for high-purity distillates to meet regulatory and sensory requirements, with specifications that may include minimum assay values and limits on impurities. The crystallization, fractional distillation, or liquid-liquid extraction steps are used as necessary to meet defined food-grade specifications. Such controlled production ensures that the compound meets regulatory expectations for use in flavor formulations, whether in beverage systems, confectionery, ice cream, or baked goods, where consistent sensory performance is critical.

Why It Is Used In Food

Butyl formate is used in food primarily for its fruity sensory profile and its ability to enhance or impart desirable flavor characteristics. In the formulation of flavors, it contributes top notes reminiscent of plum or fruit, making it valuable in flavor blends designed for fruit-flavored beverages, candies, desserts, and other products where a fruity dimension is desired. Its role as a flavor enhancer or adjuvant stems from its ability to complement other flavor compounds, adding complexity and sweetness perception without contributing caloric value or altering nutritional profiles. In food science and product development, flavoring agents like butyl formate are selected not only for their aroma profiles but also for their compatibility with other ingredients and their stability under processing conditions. When used artfully, esters such as butyl formate help create balanced flavor profiles that meet consumer expectations in a wide variety of applications. The compound’s inclusion in regulatory lists such as 21 CFR 172.515 and its evaluation by international bodies like JECFA support its continued use in food products under conditions that reflect good manufacturing practice.

Adi Example Calculation

Because butyl formate is not assigned a specific numeric Acceptable Daily Intake (ADI) value by JECFA or FDA regulations, a precise mathematical example using an ADI is not applicable for this substance. Instead, its safety assessment is based on the conclusion of no safety concern at typical intake levels when used as a flavouring agent. Under the principles of good manufacturing practice, producers add butyl formate in the minimum quantity necessary to achieve the desired sensory effect. An illustrative comparison might involve considering how flavoring agents are generally present at parts-per-million levels in finished products, orders of magnitude below typical toxicological effect thresholds. For example, if a flavoring blend contributes butyl formate at a trace level in a beverage, that contribution to total daily intake from multiple servings remains well below safety thresholds established through regulatory evaluation. This approach emphasizes qualitative assessment of safe use rather than reliance on a single numeric ADI figure.

Safety And Health Research

Butyl formate’s safety profile has been assessed by international scientific authorities such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA). In its evaluation, butyl formate was determined to have no safety concern at current levels of intake when used as a flavouring agent, reflecting consideration of available toxicity data and typical dietary exposure scenarios associated with its use in food flavoring systems. The assessment by JECFA is based on toxicological and exposure information compiled at the time of evaluation, and it provides a scientific foundation for understanding the relative risks under customary conditions of use. The compound’s inclusion in regulatory listings such as the U.S. Code of Federal Regulations further reflects the conclusion that, when used following good manufacturing practice, it does not pose known health risks to the general population. While detailed published toxicology data may be limited in public regulatory documents, butyl formate is generally considered safe for flavor use at levels consistent with its functional role. Typical assessments consider endpoints related to acute toxicity, subacute and chronic toxicity, and potential genotoxicity, as well as any evidence of potential for bioaccumulation. Because butyl formate is metabolized and cleared relatively rapidly due to its volatile nature and ester structure, typical dietary exposures through flavoured products are low relative to thresholds identified in safety evaluations.

Regulatory Status Worldwide

In the United States, butyl formate is included under 21 CFR 172.515 within the list of synthetic flavoring substances and adjuvants that may be safely used in food in accordance with good manufacturing practice. This regulatory citation establishes that butyl formate can be added directly to food as a flavoring provided it is used in the minimum quantity required to achieve its intended effect and handled in compliance with food additive regulations. The U.S. Food and Drug Administration (FDA) does not assign a specific Acceptable Daily Intake (ADI) for butyl formate within this regulation; rather, its safety is governed by the conditions of good manufacturing practice inherent in the regulation itself. Additionally, international evaluations by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) assigned the compound JECFA number 118 and indicated that there is no safety concern at current levels of intake when used as a flavoring agent. This global assessment provides an international scientific context for its regulatory status and supports its continued use in food applications when applied according to relevant regulatory provisions.

Taste And Functional Properties

Butyl formate is characterized by a fruity, plum-like aroma that enhances flavor perceptions in food products. Sensory scientists describe its organoleptic profile as bright and fruit-forward, making it useful in flavor compositions where a fresh fruit impression is desired. Solubility properties of butyl formate allow it to mix with both aqueous and lipid-based components to some extent, although like many esters it is more soluble in organic phases than in water, and formulators account for this during product development. From a functional standpoint, butyl formate exhibits typical ester behavior, contributing volatile aroma notes rather than bulk taste or textural effects. This volatility means that its sensory impact can be more pronounced at lower concentrations, which is a desirable feature for flavor chemicals where potency and cost-effectiveness are important. While it is generally stable at room temperature, formulators consider heat, pH, and interactions with other ingredients when designing applications to ensure that the desired sensory effect is maintained throughout production, storage, and consumption.

Acceptable Daily Intake Explained

The concept of Acceptable Daily Intake (ADI) is used by regulatory and scientific bodies to define an estimate of the amount of a substance in food or drinking water that can be consumed daily over a lifetime without appreciable health risk. For some additives and flavouring agents, ADIs are established based on toxicological data and safety factors. In the case of butyl formate, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) did not assign a formal numeric ADI because it concluded that the compound presents no safety concern at current levels of intake when used as a flavouring agent. This phrasing implies that, under typical conditions of use in foods, exposure levels are sufficiently low that formal numeric ADI limits were not deemed necessary by the reviewing panel. Even in the absence of a numeric ADI, the principle of good manufacturing practice governs safe use, emphasizing that additive levels should be the minimum needed to achieve the desired flavor effect. For consumers, this means that butyl formate’s presence in food products is controlled by regulatory frameworks and manufacturing standards designed to ensure that overall exposure remains low and within ranges considered safe based on scientific evaluations.

Comparison With Similar Additives

Butyl formate can be compared with other ester-based flavoring agents that provide fruity or sweet notes in food and beverage applications. For example, ethyl butyrate and isoamyl acetate are also esters commonly used for their fruity aroma profiles in similar product categories. Ethyl butyrate is known for its strong pineapple and tropical fruit character, while isoamyl acetate is associated with banana-like notes. Like butyl formate, these compounds are used at low concentrations and evaluated for safety within regulatory frameworks that govern flavoring substances. Another comparison is with methyl anthranilate, an ester used for grape-like flavors. While the specific sensory profiles differ, all these ester-based additives share common traits in flavor chemistry, such as volatility, fruity odor impressions, and functional use at low concentrations. In terms of regulatory handling, many of these compounds are listed in flavoring regulations such as 21 CFR 172.515 or similar sections, and have been evaluated by scientific bodies such as JECFA. The differences mainly lie in the specific sensory profiles and the nuances of their usage patterns in various food systems.

Common Food Applications Narrative

Butyl formate is widely used within the food and beverage industry as a flavoring agent to deliver appealing fruity notes that consumers associate with fresh fruit or dessert-like characteristics. In beverage systems, it may be part of flavor blends for fruit drinks, carbonated soft drinks, or flavored waters, contributing top notes that evoke plum, apple, or mixed-fruit impressions. Similarly, in confectionery applications such as hard candies, gummies, and sugar-based sweets, butyl formate helps deliver a clean, sweet, fruit-forward profile that enhances the overall flavor experience. In dairy and frozen dessert categories, this compound can be used in ice creams, sherbets, and yogurt products where fruity or dessert-inspired flavors are featured. Its role is to enhance the perception of fruit or tropical profiles without adding actual fruit content, which can help control formulation costs and ensure sensory consistency over product shelf life. Beyond liquid applications, butyl formate may also be found in dry mixes for bakery products and powdered beverage bases, where it helps round out and intensify fruit flavors when the products are rehydrated or baked. Across these diverse uses, its effectiveness lies in its ability to integrate into complex flavor matrices, providing brightness, character, and consumer appeal.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: No specific EFSA numeric ADI available from authoritative EFSA source

JECFA

  • Year: 1997
  • Adi Display: No safety concern at current levels of intake

Sources

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