CINNAMYL ISOBUTYRATE

CAS: 103-59-3 FLAVORING AGENT OR ADJUVANT

Cinnamyl isobutyrate is an ester used as a flavoring agent in foods with a sweet fruity aroma used under good manufacturing practice.

What It Is

Cinnamyl isobutyrate is an organic ester compound identified by the Chemical Abstracts Service number 103-59-3 and classified primarily as a flavoring agent or adjuvant. It belongs to a class of plant-derived and synthetically produced aromatic esters that deliver sensory notes described as sweet, fruity, and balsamic, often reminiscent of apple and banana, which is why they are valued in food flavor formulations. This compound may also be known by several synonyms such as CINNAMYL 2-METHYLPROPANOATE, 3-PHENYL-2-PROPEN-1-YL ISOBUTYRATE, and variations on these structural descriptive names. It is recognized in flavor databases with identifiers including FEMA number 2297 and JECFA number 653, indicating its use in the context of flavor regulation evaluations as a food flavoring ingredient. The molecular structure of cinnamyl isobutyrate consists of a cinnamyl alcohol moiety esterified with isobutyric acid, resulting in the characteristic aroma profile exploited in foods and beverages. The ester functional group and phenyl substituent contribute to its solubility in organic phases and its sensory impression, while its CAS registry provides a reliable identifier for chemical databases. This additive does not function as a nutrient or preservative but serves to provide or enhance desirable aromatic characteristics in formulated products, used in minimal quantities to achieve desired sensory effects under regulatory frameworks.

How It Is Made

Cinnamyl isobutyrate is typically synthesized through a classical esterification reaction where cinnamyl alcohol reacts with isobutyric acid in the presence of an acid catalyst, such as sulfuric acid, under controlled conditions. This type of chemical esterification involves heating the reactants and catalyst with removal of water to shift the equilibrium toward the formation of the ester, followed by purification steps such as distillation to isolate the target compound in high purity. Alternate synthesis methods may use enzymatic catalysis under milder conditions, using immobilized lipase catalysts to promote ester formation with potentially fewer by-products. In industrial or laboratory settings, attention to reaction stoichiometry and catalyst choice is essential to maximize yield and reduce the presence of unreacted starting materials. After the reaction, the mixture is typically washed to remove acidic residues and then subjected to techniques like fractional distillation to separate the desired ester from other compounds based on boiling point differences. Whether made synthetically or extracted from natural sources, production processes aim to meet stringent specifications on purity when the ester is destined for use in food and flavor applications. Cinnamyl isobutyrate supplied for food use generally must adhere to food-grade quality standards and be handled using good laboratory or manufacturing practices to ensure consistency and safety. The technical process described reflects general chemical manufacturing principles as applied to ester flavor compounds, where simple alcohol and acid precursors yield a structurally defined aroma-active molecule.

Why It Is Used In Food

Cinnamyl isobutyrate is used in food primarily for its sensory contribution, where it imparts a sweet, fruity, and balsamic aromatic profile that enhances or complements flavor formulations. Because esters often provide appealing fruit-like notes, they are valuable in confectionery, beverages, baked goods, and other food product categories where such sensory boosts are desirable. The use logic for this additive is rooted in achieving specific aroma characteristics that may be difficult to attain with natural ingredients alone or that allow consistent flavor quality in processed foods. In addition to sensory enhancement, flavoring agents like cinnamyl isobutyrate can help reduce formulation variability, support clean label development by enabling lower levels of other intense flavorants, and integrate with complex flavor systems to achieve balanced and consumer-appealing profiles. Their inclusion in food products occurs under regulatory conditions that stipulate they be used at levels consistent with good manufacturing practice, meaning the minimum needed to achieve the desired effect. Flavor chemists select compounds such as cinnamyl isobutyrate based on compatibility with product matrices, stability under processing conditions, and the specific flavor character sought in the final product. The combination of sensory impact and formulation flexibility accounts for the continued use of this ester in a variety of food applications within regulated frameworks.

Adi Example Calculation

For illustrative purposes only: When a regulatory body assigns a numerical ADI for a flavoring agent, the calculation of exposure relative to body weight illustrates how much of that substance a person could theoretically consume each day without exceeding the ADI. In the case of cinnamyl isobutyrate, JECFA did not assign a specific numerical ADI, instead indicating that there is no safety concern at typical intake levels. If an ADI had been established, a calculation example might show how a hypothetical adult weighing a set number of kilograms could consume a quantity of the compound equivalent to the ADI value multiplied by body weight and discuss whether typical usage levels in food are below that threshold.

Safety And Health Research

Cinnamyl isobutyrate has been the subject of evaluation by scientific expert committees that assess the safety of flavoring agents for human consumption. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed this compound and concluded that, when used at current levels in food, there is no safety concern, reflecting consideration of available toxicological data at the time of evaluation. Expert assessments typically examine data on metabolism, genotoxicity, and other endpoints to determine whether typical exposure poses a risk to consumers. Research on compounds like cinnamyl isobutyrate focuses on hazard characterization, including acute toxicity studies, and mechanistic data that inform how the compound is processed in the body. The metabolism of ester flavor compounds generally involves hydrolysis to constituent alcohols and acids, which are subsequently metabolized by endogenous pathways. These metabolic pathways are well understood for many simple esters, contributing to confidence in their safety profiles when used at low concentrations typical of flavor applications. Safety evaluations do not indicate specific adverse health effects from the regulated use of cinnamyl isobutyrate as a flavoring agent under good manufacturing practice. Nonetheless, comprehensive toxicological dossiers and regulatory reviews are essential to maintain up-to-date safety profiles, and ongoing research may inform future regulatory guidance or usage recommendations.

Regulatory Status Worldwide

In the United States, cinnamyl isobutyrate as a synthetic flavoring agent falls under the purview of the Food and Drug Administration’s food additive regulations for flavoring substances. The d Code of Federal Regulations section 172.515 addresses synthetic flavoring substances and adjuvants, which may be safely used in food under conditions of good manufacturing practice, including use at minimum quantities needed to achieve the intended sensory effect. However, the regulation text itself does not explicitly list cinnamyl isobutyrate by name within the enumerated substances, so direct regulatory approval status in this section remains inferred rather than explicitly confirmed in current published text. Regulatory evaluation typically references its inclusion in flavor inventories and expert assessments by bodies such as the Flavor and Extract Manufacturers Association and JECFA. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated cinnamyl isobutyrate and assigned it JECFA number 653, concluding that there is no safety concern at current levels of intake when used as a flavoring agent. This conclusion, reported in JECFA’s evaluations, reflects consideration of toxicological data available at the time of assessment and supports its continued use in regulated food systems under good manufacturing practices. Different countries and regions may adopt or reference JECFA evaluations as part of their regulatory frameworks, though specific approvals and permitted uses should be verified against up-to-date national food additive regulations. Regulatory guidance on flavoring agents emphasizes their safe use within defined conditions, including adherence to good manufacturing practice and monitoring of usage levels in finished products to ensure consumer safety.

Taste And Functional Properties

Cinnamyl isobutyrate exhibits organoleptic properties characterized by a sweet, fruity, and balsamic aroma with nuances that can suggest apple, banana, or tropical fruit impressions. These sensory characteristics are typical of many low molecular weight esters and contribute to their popularity in flavor design. The compound’s functional properties also include solubility in organic solvents and flavor bases, while being sparingly soluble in water, making it blend well into lipophilic food systems or flavor emulsions. From a functional perspective, cinnamyl isobutyrate is stable under typical food processing conditions when used within recommended practice, and it contributes primarily to aroma rather than taste or texture. Its heat and pH stability determine how it behaves in formulated products that undergo baking, pasteurization, or acidification, and such stability profiles must be taken into account during product development. Flavorists consider the compound’s sensory threshold and interaction with other flavor constituents when deploying it in complex flavor blends. These functional properties are essential in determining how much to include to achieve a perceptible effect without overwhelming other components. As with many aroma compounds, the sensory impression provided by cinnamyl isobutyrate can vary depending on the food matrix, processing, and the presence of other volatile compounds.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory benchmark that expresses the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, as determined by expert panels based on available toxicological data. For cinnamyl isobutyrate, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) concluded that there is no safety concern at current levels of intake when used as a flavoring agent, rather than specifying a numerical ADI value. This conclusion reflects broad consideration of the compound’s toxicity data and expected exposure from food uses. Because a numerical ADI was not assigned by JECFA, regulatory frameworks defer to the expert committee’s determination of no safety concern when the compound is used at current levels in food. This approach is consistent with evaluations of many flavoring agents where evidence does not support a specific numerical limit but supports their safety within typical use concentrations under good manufacturing practice. Understanding that ADIs represent conservative thresholds helps contextualize regulatory decisions: they provide assurance that routine dietary exposure is unlikely to pose health risks if the compound is used as intended in food products.

Comparison With Similar Additives

Cinnamyl isobutyrate can be compared with other ester-based flavoring agents used to impart fruity and sweet notes in foods, such as ethyl butyrate and isoamyl acetate. Ethyl butyrate imparts strong pineapple and tropical fruit notes and is widely used in beverage flavor systems, whereas isoamyl acetate provides banana-like notes commonly found in confectionery. Cinnamyl isobutyrate’s aroma profile tends toward balsamic and sweet-fruit nuances that complement these other esters. Functionally, many simple esters share solubility characteristics and stability constraints that affect how they are formulated into flavor blends. While ethyl butyrate and isoamyl acetate have relatively low sensory thresholds and deliver intense fruitiness, cinnamyl isobutyrate’s contribution is often more nuanced, enhancing complexity rather than dominating a flavor profile. Flavorists consider the interactions among these compounds to achieve balanced sensory outcomes in products. Comparing these additives highlights how different esters contribute distinct aromatic characteristics that flavor designers choose based on product goals, processing conditions, and consumer expectations.

Common Food Applications Narrative

Cinnamyl isobutyrate finds application in a variety of food and beverage categories where a sweet and fruity aromatic component is desirable. In products such as baked goods, confectionery, and dessert flavors, this ester can provide supporting fruity notes that uplift the overall sensory experience. Beverages, including flavored waters and carbonated soft drinks, may also incorporate such esters in flavor systems to contribute complexity and enhance fruitiness. Baked goods that include fruit flavors, fillings, or glazes may leverage cinnamyl isobutyrate to reinforce natural fruit notes or to complement other synthetic and natural flavors. In confectionery items like gummies, hard candies, or chews, the compound’s fruity character helps to round out and balance sweeter, more dominant flavor ingredients. Dairy-based drinks or ice cream mixes with fruit or spice flavor profiles can also benefit from its addition to achieve a nuanced aroma that resonates with consumer expectations. Flavor ingredient manufacturers may provide usage guidance to formulators on typical concentration ranges, though end-product use levels are governed by regulatory guidelines and good manufacturing practice. In each application, cinnamyl isobutyrate aids in delivering consistent sensory quality, enhancing flavor complexity, and helping to differentiate products in competitive markets.

Safety & Regulations

FDA

  • Notes: FDA uses general flavoring provisions but cinnamyl isobutyrate is not explicitly named in 21 CFR 172.515 despite its reference code.

EFSA

  • Notes: EFSA approval status and any ADI not available in the d sources.

JECFA

  • Notes: JECFA concluded no safety concern but did not assign a numerical ADI.
  • Adi Display: No safety concern at current intake levels when used as a flavoring agent

Sources

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