CITRONELLYL PHENYLACETATE

CAS: 139-70-8 FLAVORING AGENT OR ADJUVANT

Citronellyl phenylacetate is a synthetic ester with a pleasant floral aroma used primarily as a flavoring agent or adjuvant in food and beverage applications and evaluated by JECFA as a flavoring substance.

What It Is

Citronellyl phenylacetate is a chemical compound classified as a flavoring agent or adjuvant, characterized by a floral and sweet aroma that enhances taste profiles in foods and beverages. Its systematic chemical designation corresponds to an ester formed from a citronellyl alcohol moiety and a phenylacetic acid component. As an ester, it belongs to the large class of organic compounds commonly used in flavor and fragrance applications due to their volatility and characteristic scent properties. The chemical is identified under CAS number 139-70-8 and is referenced in regulatory contexts for flavoring purposes. The compound is sometimes referred to by other chemical synonyms, including citronellyl alpha-toluate and 3,7-dimethyl-6-octenyl phenylacetate, which reflect its structure and functional groups. Although its primary value is sensory, it is also subject to regulatory evaluation to establish safety parameters for its intended uses in food products and related consumer goods. Compared with its structural analogs in the ester family, citronellyl phenylacetate has a distinct combination of hydrophobic and aromatic features that influence its sensory characteristics and functional performance in formulations. In technical contexts, it is described as an organic ester with a relatively high molecular weight compared with simple esters, and its properties such as solubility, volatility, and stability are important for both flavor formulation scientists and regulatory assessors. Due to its flavoring role, it falls under specific regulatory frameworks that govern the addition of flavoring agents in food, which require documentation on safety evaluations. Multiple regulatory bodies around the world consider such flavoring agents in the context of acceptable daily intake assessments and guidelines for safe use. Its sensory contribution to foods is often described as floral, sweet, and fruity, attributes that make it useful in a variety of product categories, from beverages to baked goods, where enhancing or modifying aroma and taste profiles is desired. Overall, citronellyl phenylacetate is recognized within the flavor industry as a functional ingredient that imparts specific sensory qualities, and its use in food-related applications is guided by established regulatory evaluations and safety assessments that consider existing scientific data and exposure levels.

How It Is Made

Citronellyl phenylacetate is produced via chemical esterification, a reaction type in which an alcohol and an acid or acid derivative combine to form an ester linkage and water as a byproduct. In this specific case, a citronellyl alcohol derivative is reacted with phenylacetic acid or an acid derivative such as an acid chloride or ester to yield the target ester compound. This type of synthesis is a standard method in organic chemistry for forming esters and can be catalyzed by acid catalysts under controlled temperature conditions. The resulting product is typically purified through distillation or chromatographic techniques to achieve the high purity required for flavor applications. As with many flavor or fragrance esters, manufacturing focuses on ensuring consistent sensory properties and meeting defined purity specifications. Industrial-scale production of flavoring esters often occurs under good manufacturing practices, with quality checks at various stages to ensure that the final ingredient performs reliably in end-use applications. The controlled synthesis of citronellyl phenylacetate begins with the preparation of high-grade starting materials. Citronellol, or a related citronellyl alcohol derivative, is combined with phenylacetic acid in the presence of an acid or enzymatic catalyst to facilitate ester bond formation. After reaction completion, the mixture is subjected to purification steps such as fractional distillation under reduced pressure to remove unreacted precursors and byproducts, resulting in a clear, colorless to pale yellow liquid. The purified ester is then characterized by analytical methods such as gas chromatography and mass spectrometry to confirm identity and assess purity. These analytical confirmations are essential for regulatory compliance, particularly for substances intended for human consumption. Because flavoring agents including citronellyl phenylacetate are used at low concentrations in foods and beverages, manufacturers are also attentive to stability and storage considerations. Esters may degrade over time or under adverse storage conditions, so ingredient handlers manage inventories to maintain quality. Specifications for production and storage are often informed by regulatory guidelines and industry standards, emphasizing consistency, safety, and suitability for food use.

Why It Is Used In Food

Citronellyl phenylacetate is used in foods and beverages primarily for its sensory impact, enhancing the aroma and perceived flavor profiles of products. As a flavoring agent, its floral and sweet characteristics can help round out or elevate specific taste notes in complex formulations, particularly in products where a nuanced aroma can improve consumer appeal. When formulating flavors, food scientists choose agents like citronellyl phenylacetate based on their individual sensory attributes and how they interact with other flavor ingredients to create a balanced profile. The compound’s effectiveness at low use levels makes it suitable for inclusion in a variety of food categories, including beverages, confections, and baked goods, where subtle enhancements are desirable. Beyond sensory contributions, flavoring agents often serve as tools for masking unwanted off-notes or bridging gaps in flavor perception that arise due to processing or ingredient interactions. Citronellyl phenylacetate’s aromatic features can support these technical roles by complementing natural or artificial flavor systems. In addition to food applications, its use extends into fragrance formulations for other consumer products, reflecting its dual role as a sensory agent across industries. Regulatory considerations also influence why such compounds are chosen for food use. Flavoring agents that have undergone safety evaluations and are included in recognized listings provide formulators with a degree of predictability regarding regulatory compliance. For example, inclusion in flavoring databases and referenced regulatory codes suggests that a compound has been evaluated within a recognized framework for safety, which supports its continued use in appropriate applications. This combination of sensory utility, technical functionality, and alignment with safety evaluations underlies its deployment in food and related products.

Adi Example Calculation

As an illustrative example of how an acceptable daily intake (ADI) calculation is used in a regulatory context, one might consider a hypothetical scenario where an ADI is established for a flavoring agent at a defined numeric value (for instance X mg per kg body weight per day). In such a case, a person weighing 70 kilograms would have a theoretical maximum daily intake of X times 70 mg without exceeding the ADI. This type of calculation is illustrative only and depends on the actual numeric ADI established by regulatory bodies, which is not directly provided here due to the absence of an explicit numeric value from d sources. Such examples are meant to demonstrate how ADIs translate into practical exposure considerations, helping formulators and regulators assess whether typical use levels are within safe limits.

Safety And Health Research

Safety evaluations for flavoring agents such as citronellyl phenylacetate focus on toxicological data, exposure assessments, and potential effects related to intended use concentrations. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated citronellyl phenylacetate and concluded that there was no safety concern at current levels of intake when used as a flavoring agent. This type of assessment involves reviewing available toxicology data, including studies on metabolism, acute toxicity, and potential systemic effects, to determine whether typical use levels pose a risk to consumers. These evaluations help inform regulatory decisions and support the establishment of acceptable use patterns that protect public health. In general, flavoring esters are metabolized via common biochemical pathways, and evaluations consider whether metabolites pose any concern at anticipated exposure levels. While specific numeric limits such as acceptable daily intakes (ADIs) are not detailed here due to lack of direct evidence links, qualitative assessments provided by JECFA and other flavoring expert panels support the conclusion that citronellyl phenylacetate is safe under intended use conditions. These assessments incorporate available data on toxicological endpoints and apply safety factors to account for uncertainties in extrapolating animal data to humans, ensuring a conservative approach to risk characterization. Continued research and monitoring may refine understanding of flavoring agent safety, but based on current evidence, regulatory bodies have not identified hazards at typical use levels.

Regulatory Status Worldwide

Citronellyl phenylacetate is recognized within flavoring regulatory frameworks that assess the safety and appropriate use of flavor additives in food. The compound is listed under FEMA (Flavor and Extract Manufacturers Association) number 2315 and has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) under evaluation number 1021, indicating that it has been considered in international safety assessments for flavoring agents. According to the JECFA evaluation, no safety concern at current levels of intake when used as a flavoring agent was identified. This evaluation was part of broader assessments of flavoring substances conducted by the committee. The reference to JECFA evaluation supports its status in many regulatory contexts. Furthermore, citronellyl phenylacetate is referenced in the U.S. Code of Federal Regulations at 21 CFR 172.515 as a flavoring substance, indicating that it has been identified in regulatory text governing indirect food additives permitted for use in food for human consumption. However, explicit U.S. Food and Drug Administration (FDA) approval status is not confirmed by direct regulatory documentation in this summary; therefore, the specific regulatory status under the U.S. FDA framework remains cautious without an explicit CFR citation in the provided sources. Citronellyl phenylacetate’s status in other jurisdictions, such as the European Food Safety Authority (EFSA), is not fully documented here due to lack of direct evidence, resulting in null entries for specific EFSA authorization details. Regulatory frameworks recognize flavoring agents based on safety evaluations, use levels, and technical justification, and citronellyl phenylacetate’s inclusion in JECFA and FEMA listings reflects its position within such systems.

Taste And Functional Properties

Citronellyl phenylacetate contributes a floral, sweet aroma that can influence the overall flavor profile of food and beverage products. Its sensory characteristics are defined by volatile components that interact with olfactory receptors, enhancing perception of sweetness or floral notes without imparting sugar or caloric value. As with many ester compounds, its volatility and aroma intensity are key functional properties that drive its selection by flavorists. When included in a formulation, it typically acts at low concentrations to complement or elevate other flavor components, especially in products with fruit or floral profiles. From a functional perspective, the compound is relatively stable under typical food processing conditions such as mild heating, and its solubility in lipid-based matrices makes it compatible with a range of food systems. Its limited water solubility means it is more effective in emulsified, oil-in-water, or fat-containing matrices where its hydrophobic character can be evenly distributed. Stability considerations also include susceptibility to hydrolysis under extreme pH or prolonged exposure to high temperatures, though such conditions are uncommon in most flavor use scenarios. In general, esters like citronellyl phenylacetate maintain their sensory contribution through typical product shelf life when formulated appropriately. The sensory and physicochemical properties of citronellyl phenylacetate also guide its pairing with complementary flavor agents. For example, combining it with fruity esters or aldehydes can enhance the perception of certain fruit notes, while in confectionery systems it can add complexity to vanilla or sweet profiles. These functional behaviors make it a versatile tool in the flavor chemist’s repertoire.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) is used by regulatory bodies and expert committees to define the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. It is based on toxicological data from studies conducted on animals or humans, with uncertainty factors applied to ensure safety. For flavoring agents like citronellyl phenylacetate, ADIs may be determined by panels such as JECFA following comprehensive review of available data. The ADI represents a conservative value that takes into account variability across populations and uncertainties in data extrapolation. While a specific numeric ADI for citronellyl phenylacetate is not included here due to the lack of an explicit numeric value in the available evidence, the principle remains that regulators consider exposure estimates relative to safety thresholds when evaluating flavoring agents. This approach helps protect consumers by providing a margin of safety between normal dietary exposures and levels that might cause adverse effects in experimental settings.

Comparison With Similar Additives

Citronellyl phenylacetate can be compared with other flavoring esters that provide fruity or floral sensory notes, such as allyl phenylacetate, which also contributes a honey-like aroma in formulations, and other terpenoid-based esters that enhance fruit or floral characteristics. While allyl phenylacetate is used in similar flavor contexts, the specific sensory profile and volatility can differ, leading flavor chemists to choose one ester over another based on the target flavor outcome. Other esters like benzyl acetate or phenethyl acetate are known for sweet and floral notes but vary in strength and character, influencing their functional roles. Comparing these compounds helps formulators select the appropriate flavoring agent to achieve desired sensory qualities while balancing stability, solubility, and compatibility with other ingredients. Such comparisons are grounded in technical flavor formulation practice rather than regulatory safety differences.

Common Food Applications Narrative

Citronellyl phenylacetate finds application across a wide range of food and beverage products due to its characteristic floral and sweet aroma that enhances flavor profiles. In beverage formulations, it is often included in flavored drinks and soft drinks to impart subtle floral notes that complement primary fruit flavors, contributing to a more rounded and harmonious sensory experience. Similarly, in confectionery products such as candies and chewing gums, it supports fruit and floral flavor systems by adding complexity and depth to the overall taste profile. Its use in baked goods can help introduce aromatic nuances that improve consumer perception of freshness and flavor richness. Beyond these categories, citronellyl phenylacetate also plays a role in dairy-based products where it can be blended into flavored yogurts or dessert creams to enhance fruity or sweet notes without overpowering the existing matrix. In applications such as flavored syrups and ice creams, it contributes to a layered sensory experience that aligns with consumer expectations for premium taste. The versatility of this compound allows it to be combined with other flavoring agents, including fruity esters, lactones, and aldehydes, to achieve desired sensory outcomes in product development. Food technologists value flavoring agents such as citronellyl phenylacetate for their ability to deliver specific aromatic characteristics at relatively low usage levels, making them efficient components in formulations. When balanced with other sensory attributes in a product, this compound helps bridge gaps between primary flavor notes and consumer expectations for complexity and appeal. While its use is tailored to the desired flavor outcome, the trend toward nuanced and sophisticated flavor profiles in modern food products supports continued application of such esters in a variety of categories.

Safety & Regulations

FDA

  • Notes: Specific FDA approval status could not be confirmed through provided evidence; it is referenced in CFR context but direct approval documentation was not available.

EFSA

  • Notes: EFSA authorization details and specific ADI not found in available authoritative sources.

JECFA

  • Notes: JECFA evaluation indicates no safety concern at current intake but does not provide a numeric ADI value in the d source.

Sources

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