CITRONELLYL FORMATE

CAS: 105-85-1 FLAVORING AGENT OR ADJUVANT

Citronellyl formate is a synthetic flavoring agent used in food and beverage formulations to impart fruity and floral sensory notes, with regulatory status under US CFR 21 172.515 and evaluated by international expert bodies for safety at typical use levels.

What It Is

Citronellyl formate is a synthetic ester compound belonging to the class of flavoring agents and adjuvants used in food and beverage products to contribute fruity and floral sensory characteristics. Its systematic chemical identity is represented by the CAS Registry Number 105-85-1, and its structure is that of a formate ester derived from citronellol, a naturally occurring terpene alcohol normally associated with aromatic plants. Citronellyl formate goes by several other names, including citronellyl formate 3,7-dimethyl-6-octenyl formate, citronellyl methanoate 3,7-dimethyl-6-octen-1-yl methanoate, and 6-octen-1-ol, 3,7-dimethyl-, formate, reflecting different naming conventions in chemical and regulatory databases. In the context of food science and formulation, this ingredient is categorized as a flavoring agent and adjuvant, meaning it may be used to enhance or modify flavor profiles in food and beverage matrices. Flavoring agents like citronellyl formate fall into broad regulatory categories where compounds are assessed for safety and permitted use under specified conditions, such as those listed in the U.S. Code of Federal Regulations. Citronellyl formate is typically used in very small concentrations consistent with its potent aromatic profile and the principles of good manufacturing practice. The identity of citronellyl formate as a defined flavoring substance with a specific CAS number and associated regulatory listings distinguishes it from more complex mixtures or natural extracts. This ensures that food scientists, regulatory personnel, and quality professionals can reliably reference and evaluate this compound in product development, labeling, and compliance activities.

How It Is Made

Citronellyl formate is manufactured through a chemical esterification process that combines citronellol, a primary aliphatic terpene alcohol, with formic acid under controlled reaction conditions. In general terms, an esterification reaction involves the interaction of an alcohol and a carboxylic acid in the presence of a catalyst, often an acid catalyst, to yield the corresponding ester and water as byproducts. For citronellyl formate, citronellol serves as the alcohol component and formic acid as the acid component. In industrial practice, the esterification is carried out in a reactor equipped for temperature and mixing control to ensure complete conversion while minimizing unwanted byproducts. After reaction completion, the mixture undergoes purification steps that may include neutralization of residual acids, washing, phase separation, and distillation to isolate the desired ester at the specified purity. Quality control measures are implemented to confirm that the product meets the required analytical and sensory specifications for use in food applications. Although detailed proprietary manufacturing protocols are held by individual producers, the general chemical logic remains consistent: the production of citronellyl formate relies on conventional ester chemistry that transforms starting materials into a defined flavoring compound. This production approach is typical for many synthetic flavoring esters, where the goal is to achieve high purity and consistent sensory attributes. Citronellyl formate may be supplied as a liquid concentrate and further blended into flavor formulations or finished products.

Why It Is Used In Food

Citronellyl formate is used in food and beverage products because of its ability to contribute specific sensory qualities that enhance or complement the overall flavor profile. Esters like citronellyl formate are valued for their fruity, floral, and sometimes citrus-like aromatic characteristics, which can make products more appealing to consumers. In practical formulation practice, flavorists may select this ingredient to reinforce top notes or to balance other aromatic components in complex flavor systems. Flavoring agents are added in very low concentrations to exert their desired effect without overwhelming the base product. Citronellyl formate serves as a building block in flavor design when a formulation requires bright, fresh, or fruity notes, especially in beverages, confectionery, bakery items, and other processed foods. Its use is guided by sensory evaluation and formulation objectives, with dosage levels optimized through iterative testing. Regulatory frameworks define how and when such ingredients may be used. In the United States, for example, the listing of citronellyl formate in 21 CFR 172.515 identifies it among synthetic flavoring substances and adjuvants that may be safely used in food under specified conditions. This regulatory context gives food manufacturers confidence that the ingredient is recognized in compliance frameworks when used according to good manufacturing practices. Internationally, organizations like FEMA and expert committees such as JECFA have assessed this compound for safety at levels consistent with typical intake from food use.

Adi Example Calculation

Given that JECFA has not established a numeric ADI for citronellyl formate and instead determined that there was no safety concern at current intake levels, it is not appropriate to perform a numerical ADI calculation for this compound. The regulatory conclusion reflects an assessment that typical dietary exposure from authorized uses is acceptably low, and therefore a specific numeric ADI is not used to define safe intake ranges. A general illustration of how ADIs are applied in other contexts can be helpful for understanding the concept: if an ADI were established for a hypothetical flavoring agent at a defined milligram per kilogram of body weight per day, one might calculate estimated intake for a given consumer by multiplying average consumption of foods containing that agent by the concentration in those foods, then dividing by body weight. However, because citronellyl formate’s regulatory evaluation concludes no safety concern at expected intake levels and does not assign a numeric ADI, such a calculation is not directly applicable for this ingredient. The focus remains on use according to good manufacturing practices and regulatory listings rather than a numerical ADI.

Safety And Health Research

The safety assessment of citronellyl formate, like other flavoring agents, focuses on understanding potential hazards relative to expected dietary exposure. Expert committees such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) review available toxicological data including studies on metabolism, acute toxicity, and chronic exposure as part of their evaluation process. In the case of citronellyl formate, JECFA concluded that there was no safety concern at current levels of intake when used as a flavoring agent, indicating that typical exposure through food use is not expected to pose appreciable risk within authorized use conditions. (化学信息网) Regulatory frameworks in different jurisdictions incorporate these scientific evaluations and prioritize conservative safety considerations. For example, U.S. regulations require that flavoring agents be used at levels consistent with good manufacturing practices, meaning they should be added in the minimum quantity necessary to achieve the intended sensory effect. This approach minimizes unnecessary exposure and aligns with safety principles for flavoring agents. While detailed toxicological endpoints specific to citronellyl formate are limited in public regulatory summaries, the overarching evaluation processes emphasize the assessment of genotoxicity, systemic toxicity, and any indication of adverse effects at realistic levels of dietary intake. The conclusion of no safety concern at current intake levels reflects the integration of available data with exposure estimates. Continued monitoring of scientific research and regulatory updates is part of the broader context in which food safety agencies ensure the ongoing validity of safety assessments for flavoring agents like citronellyl formate.

Regulatory Status Worldwide

Citronellyl formate’s regulatory status reflects evaluation by multiple expert bodies that assess its safety for use in food in accordance with established standards. In the United States, the compound is listed under 21 CFR 172.515 as a synthetic flavoring substance and adjuvant permitted in food when used in the minimum quantity required to achieve its intended effect and consistent with good manufacturing practices. This listing means that the U.S. FDA recognizes citronellyl formate among flavoring agents authorized for direct addition to food under specified conditions. The specific regulatory citation for this allowance is provided in CFR section 172.515, which enumerates numerous synthetic flavoring substances and related compounds assessed for use in food applications. The inclusion of this compound in that regulatory section indicates its acceptance in U.S. food regulation for the intended technical function and use conditions set forth by the agency. Internationally, citronellyl formate has been evaluated by expert scientific committees such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA). In JECFA evaluations, this compound was assessed as a flavoring agent and determined to pose no safety concern at current levels of intake when used as intended in food products. These evaluations take into account available toxicological information and typical exposure levels from food use. Such international assessments support regulatory confidence and harmonization of safety perspectives, although specific use regulations may vary by jurisdiction. (化学信息网) Additional organizational assessments by bodies like the Flavor and Extract Manufacturers Association (FEMA) provide industry-based context for usage levels and categories, although formal regulatory approval remains anchored in governmental frameworks. Collectively, these regulatory and expert assessments provide a foundation for the controlled use of citronellyl formate in food products in markets where it is permitted under defined conditions.

Taste And Functional Properties

Citronellyl formate exhibits sensory properties that are consistent with many ester-type flavoring agents: it is typically described as having a fruity, floral, or citrus-like aroma and taste profile. These sensory characteristics make it useful for enhancing top notes in flavor applications where brightness and freshness are desired. The perception of such esters can be potent even at low concentrations, which aligns with the general concept of using flavoring agents at minimal levels to achieve a balanced and appealing sensory experience. From a functional perspective in food systems, citronellyl formate’s behavior is influenced by its chemical nature as a small, relatively volatile ester. It is soluble in many organic solvents and compatible with a range of flavor carrier systems used in beverages, confections, and other products. Its volatility allows it to contribute to the aroma experienced by consumers when a packaged product is opened or consumed. In processing conditions involving heat, pH changes, or other environmental factors, ester-type flavor compounds can degrade or transform. Therefore, formulation scientists often evaluate their stability under relevant conditions and adjust formulations accordingly to maintain sensory integrity. While detailed stability data specific to citronellyl formate are not universally available, the general consideration in flavor formulation is that such esters may be more labile than some other classes of compounds. The choice to use citronellyl formate reflects the functional balance between sensory impact, formulation stability, and regulatory acceptance in the intended application.

Acceptable Daily Intake Explained

The concept of an acceptable daily intake (ADI) is used by expert bodies such as JECFA to describe the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, based on available scientific data and applying appropriate safety factors. For many flavoring agents, including citronellyl formate, JECFA’s evaluation concluded that there was no safety concern at the levels of intake expected from normal use in food products. This type of conclusion does not assign a numeric ADI but rather indicates that exposure from intended uses is acceptably low relative to safety margins. For consumers and professionals interpreting this information, understanding that a “no safety concern at current levels of intake” determination means that typical dietary exposure to citronellyl formate under authorized use conditions is considered safe. Such determinations are based on toxicological assessments that examine potential effects across a range of experimental studies and apply conservative assumptions to protect public health. As a general principle, ADIs are not recommendations for consumption but serve as reference values for regulators and manufacturers in setting use limits and ensuring that food formulation practices maintain exposures well below levels associated with adverse outcomes in studies. A statement of no safety concern effectively conveys that, within realistic use parameters and regulatory authorizations, the compound’s presence in food does not pose an appreciable risk to human health according to expert evaluation.

Comparison With Similar Additives

Citronellyl formate shares functional similarities with other ester-type flavoring agents that contribute fruity or floral sensory notes. For example, ethyl butyrate and isoamyl acetate are commonly used esters in fruit-flavored products; they each provide characteristic sensory impressions—ethyl butyrate with pineapple-like notes and isoamyl acetate with banana-like notes. Like citronellyl formate, these esters are used at low concentrations and evaluated under similar regulatory frameworks that consider safety relative to typical dietary exposure. Another related compound is citronellyl acetate, an ester of citronellol with acetic acid rather than formic acid. Citronellyl acetate also contributes fruity-floral aromatics and is used in flavor applications with regulatory acceptance in defined categories. While both compounds originate from the same alcohol precursor (citronellol), their sensory nuances and volatility profiles differ, influencing formulators’ choice depending on the desired effect in a specific product. These examples demonstrate how flavor chemists select from a palette of structurally related compounds to achieve particular sensory outcomes. Regulatory acceptance criteria, sensory characteristics, and formulation context guide the choice among similar additives, with safety evaluations ensuring that each selected substance is used within accepted practice and exposure expectations.

Common Food Applications Narrative

Citronellyl formate finds application across a wide range of food and beverage products where fruity and floral flavor notes are desirable. In beverage formulations, particularly flavored soft drinks, fruit-based drinks, and alcoholic mixers, this compound can contribute to a bright and refreshing aromatic profile that complements other fruit-derived flavors. Its ability to provide top-note complexity makes it valuable in citrus-flavored products, berry blends, and other formulations where sensory layering enhances consumer appeal. In confectionery applications such as hard candies, chewy sweets, and gums, citronellyl formate is used in small amounts to heighten fruity impressions without dominating the overall taste profile. The use of such flavoring agents in confectionery highlights how nuanced sensory design can influence product differentiation and consumer perception. Similarly, in bakery and dessert products, this ingredient can accentuate fruity or floral impressions in icings, fillings, and baked goods when combined with complementary flavor materials. Beyond beverages and sweets, citronellyl formate may be incorporated into dairy-based desserts, flavored yogurts, and frozen treats to support strawberry, citrus, or exotic fruit flavor profiles. The broad consumer demand for diverse and vibrant flavors in packaged foods drives innovation and the inclusion of defined flavoring compounds that provide precise sensory effects. Within regulatory frameworks that permit its use under good manufacturing practices, formulators integrate citronellyl formate to achieve intended sensory outcomes while ensuring compliance with labeling and safety expectations.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA specific approval and numeric ADI not identified in available authoritative sources

JECFA

  • Notes: JECFA concluded no safety concern at current intake levels but did not assign a numeric ADI

Sources

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