CITRONELLYL BUTYRATE

CAS: 141-16-2 FLAVORING AGENT OR ADJUVANT

Citronellyl butyrate is a synthetic flavoring substance primarily used as a flavoring agent or adjuvant in food products due to its fruity, floral aroma and taste.

What It Is

Citronellyl butyrate is a synthetic flavoring agent and adjuvant used in food formulation to provide fruity and floral sensory characteristics. It is chemically an ester formed from citronellol and butyric acid, and it is recognized for its sweet, green, and rose-like aroma profile. In regulatory inventories, it appears in the FDA Substances Added to Food list and is referenced under 21 CFR 172.515 for synthetic flavoring substances and adjuvants. The compound’s CAS Registry Number is 141-16-2, confirming its unique identity among flavoring agents. Its designation in flavor industry reference lists (such as FEMA number and JECFA functional class) highlights its application scope in food and beverage flavor systems. Industry technical descriptions often note its presence in compositions for fruit-type and floral bases, where it contributes to the overall balance of sensory impressions in the final product. The classification of citronellyl butyrate as a flavoring agent or adjuvant underlines its role not as a nutrient or essential ingredient, but as a component that modifies sensory perception and enhances palatability in processed food products. In sensory evaluation terms, esters such as citronellyl butyrate are valued for the way they interact with other volatile compounds to round out and enrich perceived flavor profiles. While it has technical utility in food manufacturing, its use is guided by regulatory provisions that ensure it is applied at levels appropriate for its intended effect and consistent with good manufacturing practices. Citronellyl butyrate does not serve a preservative or nutritional purpose in food; instead, its primary function is to contribute to the aroma and flavor complexity of formulated products.

How It Is Made

The production of citronellyl butyrate typically involves esterification chemistry between the alcohol citronellol and butyric acid under conditions that promote the removal of water formed during the reaction. Esterification can be catalyzed by acid catalysts in the presence of azeotropic agents to drive the equilibrium toward ester formation. Alternatively, derivatives of butyric acid such as butyric anhydride may be employed to facilitate the esterification process. The reaction is controlled to achieve food-grade purity and minimize byproducts that could affect sensory properties or regulatory compliance. In commercial settings, manufacturers producing flavor ingredients like citronellyl butyrate operate under defined quality systems that ensure consistency of scent and taste profiles. The crude ester product is typically purified by distillation or other separation techniques to remove unreacted starting materials and low levels of impurities. Specifications for food-grade citronellyl butyrate will often include parameters for purity, refractive index, and sensory characteristics to ensure conformity with regulatory and industry standards. While the detailed proprietary steps of industrial synthesis may vary between producers, the overall approach remains grounded in classical esterification chemistry. The final product is provided in liquid form with well-characterized chemical and sensory attributes suitable for incorporation into complex flavor formulations.

Why It Is Used In Food

Citronellyl butyrate is used in food primarily for its ability to impart and enhance fruity and floral notes in flavor formulations. In complex flavor blends, it contributes sweet-fruity nuances that complement other volatile compounds, making it valuable in applications such as fruit-flavored beverages, confectionery, and bakery systems. The ester contributes to consumer-perceived attributes that can increase product appeal without adding caloric value or nutritive properties. Its selection by flavorists is often driven by the need to achieve specific sensory targets, such as a fresh fruit aroma or a balanced floral undertone, that are difficult to achieve with natural extracts alone. Flavoring agents like citronellyl butyrate are also useful in masking off-notes from processing or ingredient interactions. When used in formulations, the compound helps create a harmonious sensory profile that aligns with product expectations for a given category. Its technical function as an adjuvant means it may assist other flavoring substances in delivering the desired aroma intensity or breadth without dominating the overall profile. These characteristics make it a flexible component in the flavor chemist’s toolkit for a range of food products where a nuanced sensory impact is essential to consumer acceptance.

Adi Example Calculation

Because regulatory evaluations for citronellyl butyrate have concluded that there is no safety concern at current levels of intake and no numerical acceptable daily intake has been specified, there is no illustrative calculation for an ADI based on a numerical value. In general, for additives with a defined ADI, an example calculation might take a hypothetical body weight and multiply it by the ADI to estimate a daily intake threshold. For instance, if an additive had an ADI of X mg/kg body weight per day, a person weighing Y kilograms could theoretically consume up to X times Y milligrams without exceeding the specified intake threshold. This type of calculation is used for transparent communication about safety margins, but in cases where a compound’s regulatory evaluation does not assign a numerical ADI because it is considered safe at expected intake levels, such an example is not applicable.

Safety And Health Research

Regulatory evaluations of citronellyl butyrate focus on safety at expected dietary exposure levels arising from its use as a flavoring ingredient. International expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have examined available toxicological data and concluded that there is no safety concern at current levels of intake when used as a flavoring agent, with comments indicating that secondary components do not raise safety concerns. This type of assessment considers studies of acute toxicity, metabolic pathways, and exposure in context of typical usage. Safety evaluations do not suggest inherent hazards at the low exposure associated with flavoring use, and no numerical acceptable daily intake was specified in the JECFA evaluation. Toxicological data typically reviewed by regulators include standard endpoints such as acute toxicity measures and considerations of genotoxicity, but for many flavoring esters of this type, the primary concern is ensuring that use levels remain within the bounds of good manufacturing practice. Regulatory safety frameworks aim to provide assurance that the compound can be used within specified conditions without posing undue health risks to consumers.

Regulatory Status Worldwide

Citronellyl butyrate is authorized as part of the list of synthetic flavoring substances and adjuvants that may be safely used in food under the conditions prescribed in 21 CFR 172.515 by the U.S. Food and Drug Administration. Internationally, JECFA has evaluated this flavoring agent (JECFA number 65) and determined that there is no safety concern at current levels of intake when used as a flavoring agent.

Taste And Functional Properties

Citronellyl butyrate is characterized by a sweet, fruity, and floral sensory profile with green and rose-like nuances that make it suitable for enhancing a wide range of flavor applications. As an ester, it integrates well with other volatile flavor compounds, contributing to the overall complexity of a flavor blend. Its solubility characteristics are typical of many flavor esters: it is more soluble in nonpolar and moderately polar solvents than in water, which influences how it disperses in food matrices. The functional behavior of citronellyl butyrate in food is influenced by factors such as temperature, pH, and interactions with other ingredients, all of which can affect volatility and perception. In sensory evaluations, esters like citronellyl butyrate are appreciated for their role in rounding out and moderating harsher or more singular notes from other components. When heat is applied during processing, some volatility losses may occur, so formulators account for this in dosage and timing of addition. The sensory contribution of citronellyl butyrate persists in final products because it interacts synergistically with other esters, aldehydes, and alcohols to create a more robust aroma profile. The perception of its fruity and floral qualities can vary depending on the surrounding matrix, but it consistently adds a dimension of complexity that is valued in crafted flavor profiles.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a concept used by food safety authorities to denote an estimate of the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. For many flavoring agents including citronellyl butyrate, regulatory evaluations by expert committees such as JECFA conclude that there is no safety concern at current levels of intake, meaning that typical usage patterns do not require the specification of a numerical ADI. The absence of a defined numerical ADI in this case reflects a determination that exposures from intended use as a flavoring agent are sufficiently low and do not raise safety concerns. When ADIs are established for other food additives, they are derived from comprehensive toxicological data using conservative uncertainty factors to account for variability between individuals and species. In the context of flavoring agents, the focus is often on ensuring that usage remains within good manufacturing practices so that general populations, including sensitive subgroups, are not exposed to levels that would trigger safety considerations.

Comparison With Similar Additives

Citronellyl butyrate belongs to a class of ester-based flavoring agents that share similar sensory characteristics and technical functions. Other esters such as amyl butyrate and pentyl butyrate also contribute fruity and sweet notes to flavor profiles, with each having distinctive aroma signatures that influence how they are used in formulation. While amyl butyrate may evoke pear or banana-like impressions, and pentyl butyrate is noted for apricot-like qualities, citronellyl butyrate’s floral-fruity profile offers a complementary dimension in complex blends. Compared to these similar additives, citronellyl butyrate is often selected for applications where a green, rose-like nuance enhances the overall sensory effect. Despite differences in odor character, all of these esters are evaluated through similar regulatory frameworks that consider safety based on typical usage levels and exposure.

Common Food Applications Narrative

In the development of processed and formulated foods, flavor plays a crucial role in shaping consumer experience and acceptance. Citronellyl butyrate, with its fruity and floral sensory character, is used by food manufacturers and flavor houses to enrich the taste and aroma profiles of a variety of products. For example, in fruit-flavored beverages, the compound can help evoke fresh fruit impressions that align with consumer expectations for a vibrant and appealing sensory experience. In confectionery applications, its sweet and green nuances can support the desired flavor theme, reinforcing notes such as apple, plum, or tropical fruit. Bakery items and desserts often rely on carefully balanced flavor blends to ensure that the final product delivers a consistent and attractive aroma during consumption. The inclusion of citronellyl butyrate assists in achieving this balance, especially in products where a pronounced fruit or floral note is part of the intended sensory identity. Its use extends to dairy-based desserts and ready-to-eat snacks where subtle aromatic enhancements contribute to overall product quality. In each of these broad categories, the technical objective is to support a flavor composition that resonates with consumer preferences for natural and pleasant sensory attributes. By integrating sensory chemistry with regulatory compliance frameworks, manufacturers can utilize flavoring agents like citronellyl butyrate to meet both quality and safety expectations in everyday food products.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA-specific evaluation not identified

JECFA

  • Year: 2002
  • Adi Display: No safety concern at current levels of intake

Sources

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