AMYL BUTYRATE

CAS: 540-18-1 FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

Amyl butyrate (CAS 540-18-1) is a fruity ester used as a flavor enhancer and flavoring agent in food and flavor formulations under flavoring regulations.

What It Is

Amyl butyrate is an organic ester identified by the Chemical Abstracts Service Registry Number 540-18-1. It is one of a class of compounds known as flavoring agents and flavor enhancers and is recognized for its fruity aroma and taste commonly likened to banana, pineapple, or pear notes. This substance falls under the category of synthetic flavoring substances and adjuvants permitted in food when used according to good manufacturing practices, as indicated by regulatory listing 21 CFR 172.515 for synthetic flavoring substances and adjuvants. It goes by several other names including amyl butanoate, pentyl butyrate, and butyric acid pentyl ester, and appears as a colorless to pale yellow liquid in technical applications. The term "flavor enhancer" describes its functional contribution in food systems by intensifying or modifying sensory characteristics without contributing significant nutritive value. Amyl butyrate’s identification and technical classification derive from its molecular structure as an ester formed from pentanol and butyric acid, yielding a compound with the molecular formula C9H18O2. Its inclusion in food and flavor systems is informed by scientific evaluation and inventory listings of flavoring substances used in the United States, as maintained by regulatory agencies. Although its use for direct addition to food may be regulated under specific sections of the Code of Federal Regulations, its functional role in flavor formulation is well established through technical literature and flavor industry inventories. The sensory profile of amyl butyrate and its chemical identity provide a basis for food scientists and flavorists to select it for applications where a sweet, fruity note is desired. The nomenclature and synonyms associated with amyl butyrate reflect common practice in food chemistry where multiple systematic and trivial names may refer to the same molecular entity. This multitude of identifiers facilitates cross-referencing across scientific, regulatory, and industrial documentation, aiding in the consistent specification of the ingredient in safety evaluations and formulation work.

How It Is Made

Amyl butyrate is typically synthesized via an esterification reaction between pentanol (also called amyl alcohol) and butyric acid in the presence of an acid catalyst. In industrial and flavor manufacturing settings, common catalysts such as sulfuric acid are used to facilitate the reaction and drive the formation of the ester linkage. This process results in the production of amyl butyrate along with water as a byproduct, which is subsequently removed to shift the equilibrium in favor of the ester product. In larger scale production, the crude reaction mixture containing amyl butyrate is subjected to purification techniques such as distillation to isolate the target compound at high purity suitable for use in flavor applications. The process conditions and purification steps are designed to meet industry standards for flavor quality, ensuring consistent organoleptic properties and compliance with relevant regulatory standards where applicable. Because amyl butyrate is used for its sensory attributes in flavor systems, controlling the purity and isomeric composition is crucial for predictable performance in end products. Quality control measures in manufacturing also involve analytical techniques to confirm the identity and concentration of amyl butyrate. Techniques such as gas chromatography may be used to analyze the ester composition and detect any impurities. Manufacturers producing flavor-grade materials typically adhere to specifications that ensure consistent sensory and chemical profiles. While specific proprietary methods may vary among producers, the general principles of organic esterification and subsequent purification remain the foundation of how amyl butyrate is made for flavor use.

Why It Is Used In Food

Amyl butyrate is used in food primarily for its ability to impart or enhance desirable fruity flavor notes. In flavor science, esters like amyl butyrate are valued for their strong, characterful sensory properties that can mimic or reinforce the taste and aroma of fruit. When incorporated into flavor blends for foods, beverages, or confections, it can contribute to consumer-perceived sweetness, fruitiness, or tropical nuances that improve the overall sensory experience of a product. Beyond pure sensory impact, flavoring agents such as amyl butyrate may also be selected for their stability in specific processing environments. Some flavoring compounds demonstrate resilience under typical food processing conditions such as heating, freezing, or mechanical agitation, which allows them to retain their identity and performance in complex matrices. The use of flavor enhancers like amyl butyrate can thus support consistent product quality across production batches. Formulators often use amyl butyrate in concert with other flavor ingredients to achieve targeted profiles that meet consumer expectations for fruit-associated products. Its functional role is as an adjunct in flavor systems rather than a primary nutrient or preservative, and it is typically employed at low concentrations appropriate for achieving the desired organoleptic effect. Its use is guided by principles of good manufacturing practice to ensure that the concentrations applied in food products are appropriate for sensory intent and consistent with regulatory inventories of allowable flavoring substances.

Adi Example Calculation

An illustrative calculation of acceptable intake for a flavoring substance-like amyl butyrate demonstrates how exposure estimates relate to bodyweight. This example is of a general nature and not a recommendation. If a flavoring ingredient were used at a hypothetical level resulting in an estimated daily intake of 0.01 milligram per kilogram of bodyweight for an adult weighing 70 kg (a common reference weight used in safety evaluations), the total daily intake would be 0.7 milligrams. Actual exposure estimates for specific flavoring substances depend on concentrations in food products and consumption patterns. Because amyl butyrate is typically used at low levels for sensory impact, calculated exposures based on average dietary intake data tend to be orders of magnitude lower than levels associated with toxicity in experimental studies. Such illustrative calculations help contextualize how safety evaluations consider bodyweight and exposure in determining whether a substance raises concerns under intended use scenarios. They are intended to illustrate general principles of exposure estimation and safety margins rather than to prescribe specific values for individual consumption.

Safety And Health Research

Safety assessments of amyl butyrate focus on its toxicological profile and exposure patterns relevant to its use as a flavoring agent. Expert panels such as those convened by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) review available data on metabolism, acute toxicity, and longer-term studies when available, and consider typical dietary exposure levels for flavoring substances. Based on such evaluations, JECFA has concluded that amyl butyrate does not pose safety concerns at current levels of intake when used as intended in food flavoring applications. The sensory impact of flavoring agents like amyl butyrate is achieved at very low use levels, which contributes to minimal systemic exposure for consumers. Toxicological data from animal studies generally indicate low acute toxicity for esters in this class, although specific endpoints such as irritation and respiratory sensitivity may be considered separately in occupational settings rather than typical dietary exposure. Safety evaluation frameworks for flavoring substances emphasize the importance of comprehensive data across multiple endpoints, including genotoxicity, chronic effects, and metabolic fate, to ensure that consumer exposure remains well below levels associated with adverse effects. Because amyl butyrate is used for sensory purposes rather than nutritive functions, its safety considerations revolve around ensuring that it does not introduce unintended toxicological risks at the concentrations used in food. Regulatory evaluations by expert committees incorporate conservative assumptions about consumption patterns and apply safety margins to account for interspecies and intra-population variability, supporting its continued use within established standards.

Regulatory Status Worldwide

In the United States, amyl butyrate is listed under the Code of Federal Regulations section 21 CFR 172.515, which permits synthetic flavoring substances and adjuvants to be safely used in food in accordance with good manufacturing practices. This regulatory listing means that it is recognized as acceptable for use as a flavoring agent when used at levels consistent with achieving the intended sensory effect. The regulatory framework emphasizes that such substances should be used at the minimum levels necessary for their purpose, aligning with principles of good manufacturing practice. Amyl butyrate also appears in flavor ingredient inventories such as the FEMA Flavor Ingredient Library, where it is identified by FEMA Number 2059 as a flavor ingredient that has been evaluated by the Flavor and Extract Manufacturers Association Expert Panel. These evaluations support its use in flavoring applications by providing reference assessments of safety under intended use conditions. At the international level, organizations such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have evaluated amyl butyrate (JECFA Number 152) and concluded that no safety concern exists at current levels of intake when used as a flavoring agent. This conclusion is based on expert review of available data and reflects the scientific consensus supporting its safety in food applications under intended use patterns. Specific regulatory regimes in other jurisdictions may apply additional procedures for flavoring approvals, but the presence of amyl butyrate in recognized inventories and expert evaluations indicates its established role as a flavoring substance in many food markets.

Taste And Functional Properties

Amyl butyrate is characterized by a strong, fruity aroma and flavor profile that is reminiscent of certain ripe fruits such as banana, pineapple, or pear. This sensory attribute makes it valuable in flavor formulation where a sweet, tropical, or fruit-like character is desired. In technical terms, its volatility and odor threshold contribute to its impact in flavor systems; even at low concentrations, it may significantly influence the overall sensory perception of a product. From a functional standpoint, amyl butyrate is an ester that exhibits limited water solubility while being miscible with many organic phases. Its chemical nature allows it to integrate well into flavor emulsions and lipid-containing food matrices, supporting consistent distribution of flavor throughout the product. Esters such as amyl butyrate also tend to possess adequate stability under typical food processing conditions, although the exact behavior may vary depending on temperature, pH, and formulation components. The sensory contribution of amyl butyrate is often described in qualitative terms among flavorists, emphasizing its contribution to fruity and sweet notes rather than specific analytical thresholds. Its inclusion in a flavor blend is determined through sensory evaluation and formulation expertise to balance its impact with other flavoring substances. Technical knowledge of its physical and chemical properties, such as volatility and reactivity, guides formulators in selecting appropriate use levels that achieve the desired effect without overpowering other flavor notes.

Acceptable Daily Intake Explained

The concept of an acceptable daily intake (ADI) provides a quantitative estimate of a substance’s daily exposure over a lifetime that is not expected to pose a health risk. In the context of flavoring agents such as amyl butyrate, expert panels like the Joint FAO/WHO Expert Committee on Food Additives review available toxicological data and typical exposure levels to determine whether an ADI can be established or whether the substance can be deemed not of safety concern at current use levels. For many flavoring substances, including amyl butyrate, the pattern and level of use in food are such that overall consumer exposure is low compared to levels that elicit toxicological effects in experimental studies. When expert committees conclude that a flavoring agent does not raise safety concerns at these low intake levels, a specific numeric ADI may not be formally defined. Instead, regulatory frameworks and inventory listings provide guidance on acceptable use within good manufacturing practice, implicitly incorporating safety considerations into allowable use practices. It is important to understand that an ADI is a conservative estimate intended to protect all individuals across populations, often incorporating safety factors to account for uncertainty and variability. In practice, actual intake of flavoring substances like amyl butyrate from foods is expected to be far below any threshold of concern identified in toxicological evaluations, reflecting the principle that flavoring agents are used at levels appropriate to achieve sensory effects rather than to constitute a significant portion of the diet.

Comparison With Similar Additives

Amyl butyrate is one member of a broader class of ester flavoring agents that share fruity sensory profiles and functional roles in food flavors. For example, ethyl butyrate and methyl butyrate are smaller-chain esters that also contribute fruity notes resembling pineapple or apple in flavor systems. While all three esters provide fruit-like sensory contributions, differences in molecular structure influence their volatility and odor characteristics, leading formulators to select specific esters based on the desired nuance within a flavor blend. Compared with larger esters such as hexyl butyrate or heptyl butyrate, amyl butyrate often offers a balance between volatility and persistence that is suitable for many beverage and confectionery applications. Larger esters may have lower volatility and can contribute more sustained top notes, while smaller esters may evaporate more readily, affecting the flavor profile over time. These functional differences inform the choice of ester components in complex flavor formulations. Flavorists also consider how these esters interact with other classes of flavoring substances, such as aldehydes or ketones, to achieve a multidimensional sensory profile. The selection of amyl butyrate alongside complementary compounds allows for nuanced customization of fruit flavors without overwhelming other sensory cues in the product.

Common Food Applications Narrative

Amyl butyrate’s fruity aroma and taste characteristics make it a versatile ingredient in the formulation of fruit-flavored and dessert-flavored foods. In confectionery products such as candies, gummies, and fruit chews, it can be used to support bright, sweet fruit notes that consumers associate with specific flavors like banana or pineapple. Similarly, in baked goods and pastries, where complex flavor profiles are needed, amyl butyrate may be part of a flavor blend that reinforces fruit-forward impressions. In beverage applications, particularly those featuring tropical or fruit punch-style profiles, amyl butyrate contributes to the overall character that helps define the sensory identity of the drink. Its usage in powdered drink mixes or flavored waters relies on the formulation expertise of flavor chemists who integrate it with other esters, acids, and aromatic compounds to achieve a balanced, appealing flavor. In dairy-based desserts like ice cream or frozen yogurt, formulations may include amyl butyrate as part of a fruit flavor concentrate to enhance the sweetness and fruit perception without adding sugar. Other food categories such as sauces, snack coatings, and gelatin desserts can also incorporate amyl butyrate to support fruit-inspired flavor themes. In each of these broad categories, the common thread is the role of amyl butyrate in delivering or amplifying sensory qualities that are associated with fruit, sweetness, or tropical nuances, helping food producers create products that align with consumer expectations for flavor. Its usage reflects standard practices in flavor blending where multiple compounds work together to achieve a complex sensory profile.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: No specific EFSA flavoring evaluation document found with numeric values

JECFA

  • Notes: JECFA concluded no safety concern at current intake levels without numeric ADI

Sources

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