CITRONELLYL ISOBUTYRATE

CAS: 97-89-2 FLAVORING AGENT OR ADJUVANT

CITRONELLYL ISOBUTYRATE is a synthetic flavoring agent used to impart or enhance fruity notes with a sweet, citrus or floral character in flavor formulations. It is listed under the JECFA flavouring agents database and appears in FDA synthetic flavoring substance regulations.

What It Is

CITRONELLYL ISOBUTYRATE is a synthetic chemical compound classified as a flavoring agent or adjuvant, recognized for its application in enhancing flavor profiles in food and beverage products. It belongs to the class of ester compounds formed from citronellol and isobutyric acid and is identified by the Chemical Abstracts Service with the registry number 97-89-2. In flavor and fragrance applications, it is described as providing fruity, sweet, citrus-like, and floral sensory characteristics, contributing complexity and desirability to flavor blends. The compound is evaluated internationally by scientific committees as a flavoring substance, reflecting its functional role in food formulations while being subject to regulatory review by authorities such as the U.S. Food and Drug Administration and the Joint FAO/WHO Expert Committee on Food Additives. Its classification is consistent across flavor libraries and technical references, where it may appear with alternate nomenclature in chemical databases.

How It Is Made

CITRONELLYL ISOBUTYRATE is typically produced by chemical esterification, a reaction that combines the alcohol component citronellol with isobutyric acid under controlled conditions to form the ester linkage characteristic of this compound. Esterification processes may involve catalysts, removal of water formed during the reaction, and purification steps to achieve food-grade quality. In industrial practice, manufacturers aim to achieve a high degree of purity and controlled sensory properties, adhering to flavor industry specifications. The resulting product is usually a colorless to pale liquid with a distinct aroma and taste profile appropriate for use in flavor applications. Although specific manufacturing processes are proprietary to individual producers, most descriptions emphasize this general esterification approach as the basis for production in the flavor industry.

Why It Is Used In Food

CITRONELLYL ISOBUTYRATE is used in food primarily because of its ability to impart or enhance desirable flavor characteristics that are difficult to achieve through natural ingredients alone. Its sensory profile, often described as fruity with citrus and floral nuances, makes it particularly valuable in flavor formulations for products seeking brightness, sweetness, or tropical fruit-like impressions. Flavor chemists incorporate such esters to round out sensory profiles, balance sweetness or acidity, and create more complex and appealing tastes in a wide range of consumer foods and beverages. Moreover, because it can be used in relatively small quantities due to its potency, it supports formulation goals that prioritize strong flavor impact with minimal addition, compatible with good manufacturing practices.

Adi Example Calculation

As an illustration of how Acceptable Daily Intake estimates are used (without prescribing intake amounts), imagine a hypothetical ADI benchmark of X mg per kilogram of body weight per day for a flavoring agent. For an adult weighing 70 kilograms, that hypothetical ADI would multiply X by 70 to yield a hypothetical daily maximum intake X multiplied by weight in milligrams per day. This illustration is for explanatory purposes only and does not represent a specific ADI for CITRONELLYL ISOBUTYRATE, since a numeric ADI value was not set in the internationally reviewed evaluation summary.

Safety And Health Research

Scientific assessments of flavoring compounds like CITRONELLYL ISOBUTYRATE focus on the potential for consumer exposure through food use and the evaluation of toxicological data to determine if typical use presents any safety concerns. International expert panels, such as the Joint FAO/WHO Expert Committee on Food Additives, reviewed the compound and indicated no safety concern at current levels of intake when used as a flavouring agent, taking into account the compound and its secondary components. These assessments generally consider a range of toxicological endpoints and evaluate available data to identify hazards and potential exposures relevant to human consumption. Safety research in this domain often includes studies on absorption, metabolism, and effects at high doses in laboratory models, though the primary regulatory determinations hinge on evidence indicating adequate margins of safety for typical use levels in foods.

Regulatory Status Worldwide

CITRONELLYL ISOBUTYRATE is included in the United States Code of Federal Regulations under the section that lists permitted synthetic flavoring substances and adjuvants, indicating its recognized use under specified conditions of good manufacturing practice and minimum effective quantity, as outlined in Title 21, Section 172.515 of the CFR governing food additives permitted for direct addition to food. This regulatory reference provides the framework for how such flavoring agents should be used in foods. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated the compound in its series of flavoring agent assessments and concluded there is no safety concern at current levels of intake when used as a flavoring agent, reflecting international technical evaluation. National regulatory agencies may also adopt or reference JECFA evaluations as part of their food additive approval processes, reinforcing its standing within food safety and flavoring guidelines.

Taste And Functional Properties

CITRONELLYL ISOBUTYRATE is noted for its organoleptic properties that include sweet, fruity, citrus-like, and floral sensory impressions. These characteristics make it useful in blending with other flavoring compounds to create nuanced profiles in food and beverage applications. Its functional properties as an ester mean it is typically soluble in alcohol and oil matrices used in flavor formulation, while sparingly soluble in water, necessitating appropriate formulation strategies depending on the food system. The physical nature of the compound as a liquid at room temperature facilitates handling and blending within flavor houses. Its stability under typical flavor formulation conditions supports consistency in finished products, though specific behavior under extreme processing conditions (such as high heat or low pH environments) may require consideration by flavor specialists.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) represents a quantitative estimate of a substance that can be consumed daily over a lifetime without appreciable health risk, based on available toxicological data and conservative safety factors. For flavoring agents like CITRONELLYL ISOBUTYRATE, international expert committees have evaluated data relevant to safety and intake, with the resulting conclusions guiding regulatory positions on allowable use. When a committee states there is no safety concern at current levels of intake, it reflects an assessment that typical consumer exposure from normal use in foods does not approach levels associated with harmful effects in experimental studies. It is important to understand that ADIs are advisory benchmarks used in regulatory contexts rather than recommended consumption targets for individuals.

Comparison With Similar Additives

CITRONELLYL ISOBUTYRATE shares functional similarities with other ester-based flavoring agents that provide fruity and citrus-like sensory notes, such as ethyl butyrate and isoamyl acetate, which are also used to impart fruitiness in flavor formulations. While ethyl butyrate is widely recognized for its pineapple-like aroma and isoamyl acetate for its banana-like character, CITRONELLYL ISOBUTYRATE offers a blend of fruity, citrus, and floral qualities that can complement or round out blends where those singular notes are less desirable alone. Another comparison is with methyl butyrate, which conveys sweet fruity nuances but may lack the floral undertones that CITRONELLYL ISOBUTYRATE provides. Formulators often select among such compounds based on desired sensory effects and compatibility with other ingredients to achieve balanced flavor profiles in diverse food systems.

Common Food Applications Narrative

CITRONELLYL ISOBUTYRATE is incorporated into product categories that emphasize fruity, citrus, or floral flavor experiences to enhance overall sensory appeal in consumer products. Typical applications include fruit-flavored beverages where it contributes fresh, sweet nuances; dairy desserts and frozen treats to enhance tropical or citrus profiles; confectionery items such as candies or gums to intensify fruit impressions; baked goods with fruit components that benefit from added complexity; and powdered drink mixes designed to deliver bright and refreshing taste impressions. Its use supports the development of flavor formulations tailored to consumer expectations for vibrant, balanced, and memorable taste experiences across multiple food categories.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA evaluation not located for this specific additive

JECFA

  • Year: 2002
  • Notes: JECFA evaluation concluded no safety concern but did not specify an ADI value
  • Adi Display: No safety concern at current levels of intake

Sources

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