CINNAMYL PROPIONATE

CAS: 103-56-0 FLAVORING AGENT OR ADJUVANT

Cinnamyl propionate is a synthetic ester used as a flavoring agent in food, permitted in the United States under specified conditions in 21 CFR 172.515 and evaluated by JECFA as a flavoring substance.

What It Is

Cinnamyl propionate is an organic chemical compound classified as a flavoring agent or adjuvant used in food products where it contributes characteristic aroma and taste enhancements. It is a simple ester formed from cinnamyl alcohol and propionic acid, belonging to a class of aromatic esters widely employed in the flavor and fragrance industries due to their sweet, fruity, and balsamic sensory properties. The compound is recognized by its CAS Registry Number 103-56-0, and it has a well-defined identity and nomenclature for regulatory and technical purposes. Other synonyms include gamma-phenylallyl propionate and cinnamyl alcohol, propionate, which reflect its chemical structure and relationships to its precursors. The technical function of cinnamyl propionate in food formulations is to impart or enhance specific sensory characteristics, especially fruity and spicy notes, adding depth and complexity to flavor profiles. Its classification as a flavoring agent or adjuvant reflects its role in supporting or modifying flavor impressions in a range of food categories. The inclusion of this additive in regulatory lists, such as the USDA and FDA flavoring inventories, underscores its accepted use when applied under defined conditions of good manufacturing practice. Flavoring esters like cinnamyl propionate are part of a broad family of substances that deliver organoleptic characteristics without contributing nutritional value. Esters typically arise from the chemical reaction between an alcohol and an acid; in this case, the alcohol component, derived from a phenyl-substituted allyl derivative, imparts a characteristic sensory profile. Although these compounds are not nutrients, they play an essential role in the formulation of palatable and appealing food products. Cinnamyl propionate’s sensory impact and regulatory acceptance have led to its integration into various flavor systems, especially those mimicking fruit or warm spice notes, where its balance of sweet and balsamic impressions is desirable. Its identification within flavor databases supports its wide recognition and application in the flavor industry.

How It Is Made

The manufacturing of cinnamyl propionate generally involves a well-established esterification process wherein cinnamyl alcohol reacts with propionic acid under controlled conditions. Typical industrial procedures use acid catalysts, elevated temperatures, and techniques to remove water formed during the reaction, thus driving the equilibrium toward ester formation. While exact proprietary processes vary by manufacturer, the essential chemistry relies on standard organic synthesis principles common to ester production. This reaction yields the ester with the desired aromatic and flavor characteristics that define cinnamyl propionate. In the flavor and fragrance industry, purity and consistency are critical to ensuring the compound performs predictably in formulations. Commercial production often includes downstream purification steps such as distillation or chromatographic techniques to achieve high-purity material suitable for use in food applications. Quality specifications typically set minimum thresholds for assay and limit levels for impurities to ensure safety and consistency across production batches. Regulatory compendia, such as those maintained by international bodies like the Joint FAO/WHO Expert Committee on Food Additives (JECFA), provide reference methods and criteria for identifying and quantifying the substance to support compliance and quality control. Because cinnamyl propionate is synthetically produced, it is not typically obtained from natural sources in significant quantities for industrial use. However, the starting materials, such as cinnamyl alcohol, may be derived from natural extracts or synthesized chemically. This flexibility allows manufacturers to scale production to meet demand while maintaining rigorous quality and safety standards. The controlled synthesis also facilitates the consistent supply of a compound whose sensory contribution is precisely understood and desired across diverse flavor applications.

Why It Is Used In Food

Cinnamyl propionate is used in food primarily for its role as a flavoring agent, where it contributes distinctive aromatic and taste impressions that help shape the sensory profile of food products. Its inclusion in flavor formulations enhances fruity, spicy, or balsamic notes that complement other ingredients and improve consumer perception of taste and aroma. The selective use of flavoring agents like cinnamyl propionate enables food technologists to replicate complex natural flavors, balance sweetness, or mask undesirable off-notes in processed foods. Flavoring agents are integral to many food categories where sensory appeal drives consumer acceptance. Cinnamyl propionate’s particular sensory attributes make it suitable for products that benefit from warm, fruity, or spice-like characteristics. In practical application, it is used at levels where the compound’s contribution enhances overall flavor without dominating the profile or imparting off-flavors. The use of flavoring agents must adhere to principles of good manufacturing practice, ensuring the minimum effective concentration is applied to achieve the intended sensory effect. Beyond flavor enhancement, additives like cinnamyl propionate allow manufacturers to maintain consistency across production lots, especially in products with natural ingredient variability. The predictable performance of synthetic flavoring agents supports product standardization and consumer satisfaction. The role of cinnamyl propionate as a flavor adjuvant reflects its ability to support and modify flavor perception when combined with other flavoring substances, broadening its utility in formulation design and sensory optimization.

Adi Example Calculation

Because cinnamyl propionate does not have a numeric ADI established by JECFA or other authorities, this section uses a hypothetical example to illustrate how an ADI calculation would be applied if such a value were defined. For instance, if a flavoring agent had an ADI of X mg/kg body weight per day, a person weighing Y kilograms would have a lifetime daily intake threshold of X times Y milligrams per day. By comparing typical estimated intake from food use to that threshold, regulators assess whether use patterns are safe. For cinnamyl propionate, the lack of a defined numeric ADI reflects its safety assessment rather than a regulatory gap.

Safety And Health Research

The safety evaluation of cinnamyl propionate focuses on understanding potential risks associated with exposure through food use and assessing whether such use poses any concern at typical intake levels. Expert committees such as JECFA review available toxicological data, including studies on absorption, metabolism, acute toxicity, and genotoxicity, to determine if the substance presents any hazard. In the case of cinnamyl propionate, JECFA’s evaluation concluded there is no safety concern at current levels of intake when used as a flavoring agent, indicating that available evidence does not suggest harmful effects under conditions of intended use. (世界卫生组织应用程序) Flavoring agents are generally assessed based on structural analogy, metabolic pathways, and data from related compounds, as well as any direct studies available for the specific substance. Many esters like cinnamyl propionate are metabolized via hydrolysis to their constituent alcohols and acids, which are then further processed by common metabolic pathways. Toxicological data typically include acute toxicity measures, which for many flavoring esters are relatively high, indicating low toxicity at the levels encountered in food. However, ongoing monitoring and research continue to refine understanding of flavor compound safety as analytical methods improve and more data become available. In addition to formal regulatory evaluations, industry-led assessments such as FEMA GRAS evaluations provide supplementary context on structural classes of compounds and their potential safety profiles. These assessments consider broader scientific literature and exposure scenarios, reinforcing the conclusions reached by international authorities. The combined body of evidence supports the view that, when used according to regulatory guidelines and good manufacturing practice, cinnamyl propionate does not raise safety concerns within the scope of its intended food applications.

Regulatory Status Worldwide

In the United States, cinnamyl propionate is listed in 21 CFR 172.515 under synthetic flavoring substances and adjuvants, which specifies that synthetic flavoring agents, when used in accordance with good manufacturing practice, may be safely used in food products. This inclusion signifies that regulatory authorities recognize the compound’s use conditions and safety parameters within defined limits. The listing reflects a long-standing framework for permitting certain esters and related aroma chemicals as flavoring agents.21 CFR 172.515 outlines the category of synthetic flavoring substances and adjuvants permitted for direct addition to food for human consumption. At the international level, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated cinnamyl propionate (JECFA number 651) and concluded it does not pose a safety concern at current levels of intake when used as a flavoring agent. This evaluation supports its accepted use in many countries that reference JECFA assessments in their regulatory frameworks. (世界卫生组织应用程序) The flavoring and fragrance industry often also references assessments by organizations such as the Flavor and Extract Manufacturers Association (FEMA), where cinnamyl propionate is cataloged with a FEMA GRAS number indicating its evaluation as a flavor ingredient under specific conditions. The listing does not itself constitute a direct regulatory approval but indicates that expert panels have considered the available toxicological and exposure data. Different jurisdictions may have additional requirements, such as labeling guidelines or good manufacturing practice standards, that govern the use of flavoring agents. Manufacturers are responsible for ensuring that their use aligns with local food law requirements and that proper documentation and safety assessments support product claims and compliance.

Taste And Functional Properties

The sensory character of cinnamyl propionate is typically described as sweet, fruity with spicy and balsamic undertones, making it a valuable agent for imparting or enhancing particular flavor nuances in formulations. These organoleptic properties arise from the compound’s aromatic ester structure, which interacts with taste and olfactory receptors to deliver a combined perception of warm, fruity, and slightly spicy aromatics. Such properties are desirable in a range of flavor systems where complexity and depth are sought. Functionally, cinnamyl propionate behaves like many other ester-based flavoring agents. It is relatively stable under conditions of typical food processing, although like most flavor compounds, its character can change under prolonged exposure to high heat or extreme pH conditions. The compound has limited solubility in water, which influences how it is incorporated into aqueous food systems; typically, it is blended with carrier liquids or encapsulated to aid dispersion. Its physical properties, such as boiling point and volatility, are tuned to ensure that it contributes to headspace aroma without prematurely evaporating during processing. Flavor perception is multifaceted, encompassing both taste and aroma. While cinnamyl propionate does not provide basic taste modalities (sweet, sour, etc.) directly at threshold levels, its aromatic qualities significantly influence perceived flavor complexity. In combination with other ingredients, the overall sensory impression can enhance consumer enjoyment and differentiate products in competitive markets. The functional role of ester flavoring agents like cinnamyl propionate is thus rooted in their ability to provide specific sensory cues that augment product character.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a regulatory concept used to describe the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. For food additives and flavoring agents, ADIs are often established by expert bodies such as JECFA based on toxicological data, safety factors, and estimated human exposure. In the case of cinnamyl propionate, JECFA’s evaluation concluded there is no safety concern at current levels of intake when used as a flavoring agent, and therefore did not specify a numeric ADI. This outcome reflects the committee’s assessment that typical exposures from food use are well below levels that might warrant concern. (世界卫生组织应用程序) When a numeric ADI is defined for an additive, it is expressed in milligrams of the substance per kilogram of body weight per day (mg/kg bw/day). Regulatory authorities use the ADI along with exposure estimates to evaluate whether typical consumption patterns might exceed this threshold. For compounds like cinnamyl propionate where no numeric ADI is set, regulatory decisions rely on conclusions that existing uses do not pose safety concerns at current exposure levels. Understanding the concept of ADI helps consumers and stakeholders recognize that regulatory evaluations account for safety margins and lifetime exposure. It is not a recommended intake level but a benchmark below which chronic exposure is considered unlikely to result in adverse effects. The absence of a numeric ADI for cinnamyl propionate in official evaluations indicates the compound has not been identified as posing appreciable risk at the usage levels common in food flavoring applications.

Comparison With Similar Additives

Cinnamyl propionate can be compared with other ester-based flavoring agents that deliver fruity and aromatic characteristics, such as cinnamyl acetate and ethyl butyrate. Cinnamyl acetate is another aromatic ester used for fruity or floral notes in food and fragrances, and like cinnamyl propionate, it is recognized in FDA regulations when used according to good manufacturing practice. Comparative sensory profiles may influence flavorists' choices in specific applications. Ethyl butyrate, a common fruity ester, imparts pineapple-like notes and is widely used in beverages and confectionery. Although both compounds belong to the ester class, their sensory nuances differ, providing distinct options for flavor design. From a regulatory perspective, many simple esters used as flavoring agents are subject to similar frameworks, where inclusion in regulatory lists indicates acceptance under defined conditions. The choice among these compounds often depends on the specific aroma profile desired and the matrix of the food product. Understanding how these compounds differ in volatility, solubility, and sensory impact allows formulators to tailor flavor systems with precision while respecting safety and regulatory guidelines.

Common Food Applications Narrative

Cinnamyl propionate is incorporated into a variety of flavored food products to enhance sensory qualities that appeal to consumers seeking distinctive taste and aroma experiences. In ready-to-drink beverages and flavored syrups, the compound’s fruity and balsamic notes can support profiles such as grape, berry, or exotic fruit flavors, contributing layers of aroma that complement sweet and tart components. Its use in confectionery and baked goods enables flavorists to fine-tune fruit and spice impressions, adding depth to candies, pastries, and frostings where nuanced aromatic balance is important. In dairy-based desserts and frozen novelties, controlled addition of cinnamyl propionate can help simulate or strengthen flavor concepts like summer fruits or warm spice blends, working synergistically with sweet milk and cream bases. The compound’s aromatic characteristics also find use in snack seasonings and flavored coatings, where a complex mix of sweet and slightly spicy tones can enhance the overall profile without overpowering the base ingredient. Its contribution is subtle but effective, supporting the design of memorable and appealing tastes in products consumed across age groups. Because flavor perception is subjective and shaped by consumer expectations, cinnamyl propionate is typically used in conjunction with other flavoring agents within a broader formulation strategy. Blends that include this compound are carefully balanced to ensure each component contributes to the desired sensory impact. The result is a portfolio of flavored foods and beverages that deliver consistent and targeted taste experiences, from fruit-forward confections to layered beverage profiles that resonate with consumer preferences.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA specific assessments for cinnamyl propionate not found in sources

JECFA

  • Notes: JECFA evaluation concluded no safety concern at current levels of intake without numeric ADI

Sources

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