CINNAMALDEHYDE ETHYLENE GLYCOL ACETAL

CAS: 5660-60-6 FLAVORING AGENT OR ADJUVANT

Cinnamaldehyde ethylene glycol acetal is a synthetic flavoring agent or adjuvant evaluated by international food safety bodies for use as a flavoring substance in foods.

What It Is

Cinnamaldehyde ethylene glycol acetal is a chemical substance classified as a flavoring agent or adjuvant with the CAS number 5660-60-6. It is known by a number of synonyms including cinnamic aldehyde ethylene glycol acetal and cinncloval, among others. This compound falls within the class of organic acetals derived from cinnamaldehyde when it reacts with ethylene glycol. As a flavoring agent, it is incorporated in food formulations to impart or modify sensory characteristics associated with cinnamon, spice blends, and related flavor profiles. It is not a nutrient but rather a functional additive that provides aromatic qualities to a product formulation. The term "acetal" in the name reflects its chemical structure, which contains an acetal functional group formed through the condensation of an aldehyde with a diol. The ethylene glycol moiety of this compound contributes to its cyclic structure, which is part of what distinguishes it from simple aldehyde flavoring agents that might be more volatile or reactive. This structural arrangement can also influence its stability under various food processing conditions, such as pH or heat exposure. As a synthetic compound, it is subject to food additive regulatory frameworks in various jurisdictions, which assess its safety and permissible conditions of use. In technical applications, this compound is often used at very low concentrations, consistent with the role of flavoring agents in general, where minute quantities have functional effects on the sensory profile of food. Its designation as a flavoring agent or adjuvant reflects its primary purpose to contribute to or enhance flavors in food products, and it is typically integrated with other flavoring substances to achieve a desired sensory outcome.

How It Is Made

Cinnamaldehyde ethylene glycol acetal is synthesized through a well-established organic chemistry process known as acetalization, which involves the reaction of cinnamaldehyde with ethylene glycol under acidic conditions. In this reaction, the aldehyde functional group of cinnamaldehyde interacts with the hydroxyl groups of ethylene glycol to form a cyclic acetal structure. Acid catalysts, such as p-toluenesulfonic acid or similar catalysts, are commonly used to promote this transformation and drive the equilibrium toward the formation of the acetal product. The cyclic acetal linkage formed through this reaction imparts specific stability characteristics to the molecule, which are relevant for its performance as a flavoring agent. The manufacturing process typically begins with pure cinnamaldehyde, which is mixed with ethylene glycol in a solvent system appropriate for acetal formation. An acid catalyst is added to initiate and sustain the reaction. As the reaction proceeds, water is produced as a byproduct, and it may be removed from the reaction mixture to shift the equilibrium in favor of acetal formation. After completion, the reaction mixture is neutralized, and the product is purified through techniques such as distillation or chromatography to achieve a quality suitable for flavor use. The resulting product is a nearly colorless to pale yellow liquid with aromatic properties. From a regulatory perspective, food-grade manufacturing of flavoring substances like cinnamaldehyde ethylene glycol acetal requires adherence to good manufacturing practices and specification standards. These include ensuring the purity of starting materials, controlling potential impurities, and verifying the final product meets established identity and purity criteria set by flavor specification compendia or regulatory bodies. The production methods reflect general procedures for acetal synthesis rather than proprietary processes, allowing for multiple qualified suppliers to produce this compound for the flavor industry.

Why It Is Used In Food

Flavoring agents such as cinnamaldehyde ethylene glycol acetal are incorporated into food products primarily to enhance or introduce desirable sensory attributes. In this case, the compound contributes warm, spicy, and cinnamon-like notes that are associated with various culinary flavors. Manufacturers of processed foods, confectionery, and beverages often utilize such compounds to achieve consistent and targeted flavor profiles that appeal to consumer preferences. The choice of a specific flavoring compound takes into account its intensity, stability, and compatibility with the food matrix, and cinnamaldehyde ethylene glycol acetal has properties that make it suitable for specific applications where a spicy or cinnamon character is desired. One of the reasons this compound is used rather than using cinnamaldehyde itself—in some applications—is its stability under certain processing conditions. The cyclic acetal structure can afford a different release profile for the aromatic aldehyde when subjected to pH changes or other conditions in food processing, allowing for controlled sensory effects. For example, in acidic environments, this compound may release cinnamaldehyde upon hydrolysis, contributing to flavor development during processing or consumption. In other contexts, its acetal form might be preferred where direct cinnamaldehyde is too potent or reactive for the intended formulation. Another practical rationale for its use relates to formulation flexibility. Flavor chemists select compounds not only for the sensory impact they deliver but also for their solubility, volatility, and interaction with other ingredients. Cinnamaldehyde ethylene glycol acetal exhibits properties that allow it to function effectively in systems such as chewing gum, baked goods, and spice blends, where a stable yet perceptible flavor contribution is desirable. This makes it a valuable component of flavor palettes used in food product development.

Adi Example Calculation

An illustrative explanation of how an acceptable daily intake (ADI) might be considered for flavoring substances can help clarify the concept, although in the case of cinnamaldehyde ethylene glycol acetal a specific numeric ADI is not formally established. For example, if a flavoring substance had an ADI of X milligrams per kilogram of body weight per day, a hypothetical 70 kilogram adult could theoretically consume 70 times X milligrams daily over a lifetime without appreciable risk. This would be the product of the ADI value and the body weight. In practice, flavoring agents are used at very low concentrations in foods, often in the parts-per-million range, and estimated intakes from typical diets are far below levels that might approach a formal ADI. For cinnamaldehyde ethylene glycol acetal, existing expert evaluations have concluded there is no safety concern at current exposure levels, indicating that typical intake through food flavor use would be expected to be well within safe margins. In such cases, exposures are significantly lower than those that would trigger toxicological thresholds identified in controlled studies. The purpose of an example calculation is to demonstrate how ADI values relate to body weight and daily exposure estimates. It also illustrates why regulatory bodies consider both use levels in food and estimated dietary intake when assessing safety. Even where a numeric ADI is not specified, the framework for evaluating potential risk remains rooted in comparing expected human exposures to levels that are shown to be safe in scientific studies.

Safety And Health Research

Safety assessments of flavoring substances focus on the potential for adverse effects arising from typical patterns of consumption, rather than therapeutic or physiological effects. For cinnamaldehyde ethylene glycol acetal, safety evaluations by expert committees consider toxicological data, exposure estimates, and structural analogies to related compounds. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) concluded that there is no safety concern at current levels of intake when this compound is used as a flavoring agent, based on assessments conducted during the committee's evaluation process. This conclusion reflects an international scientific appraisal of evidence relevant to its food use. Toxicological endpoints that are typically examined in safety research for flavoring substances include acute toxicity, repeated-dose toxicity, genotoxic potential, and metabolic fate. While specific primary data for this compound may be limited in publicly accessible sources, expert evaluations take into account structural features and available studies to determine whether exposures at levels consistent with intended use are expected to pose risks. The designation of "no safety concern at current levels of intake" by JECFA suggests that typical use concentrations in foods are considered within safe margins when compared to potential toxicological thresholds. In the broader scientific literature, research on the cinnamyl structural class to which this compound belongs includes studies on related derivatives, their metabolism, and sensory properties. These studies help contextualize how compounds with similar chemical features behave in biological systems and inform risk assessment paradigms. It is important to recognize that assessments by authoritative bodies incorporate multidisciplinary evidence to support conclusions regarding safety. The scientific consensus from these evaluations supports the notion that cinnamaldehyde ethylene glycol acetal does not present safety issues when used as intended in food flavorings. As with any additive or flavoring substance, ongoing monitoring of new data and regulatory reviews ensures that updated scientific findings are incorporated into safety assessments over time.

Regulatory Status Worldwide

The regulatory status of cinnamaldehyde ethylene glycol acetal reflects its classification as a flavoring agent rather than a nutrient or traditional food additive. In the United States, the Code of Federal Regulations includes provisions for synthetic flavoring substances and adjuvants under 21 CFR 172.515. This section outlines that synthetic flavoring substances and adjuvants may be safely used in food when employed in the minimum quantity necessary for their intended effect and consistent with good manufacturing practice. While the regulation does not list this compound explicitly by name, its functional class and the general allowance for synthetic flavoring agents provide a regulatory context for its use in food formulations where such uses align with principles of safety and good manufacturing practice. 21 CFR 172.515 establishes the framework by which flavoring agents are permitted in food products in the US regulatory environment. At the international level, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated cinnamaldehyde ethylene glycol acetal as a flavoring agent. According to the JECFA database, the compound was evaluated during the fifty-fifth meeting of the committee and was determined to pose no safety concern at current levels of intake when used as a flavoring agent. This evaluation reflects consideration of available toxicological and exposure data within the context of its functional use in foods. The JECFA assessment provides an expert scientific basis for food safety authorities in various jurisdictions to consider this compound within their own regulatory frameworks. In other regions, including the European Union, flavoring substances are subject to a structured evaluation process that involves assessment by competent authorities such as the European Food Safety Authority (EFSA). The EU framework for flavoring substances sets out general requirements for safe use and conditions for authorization. Whether a specific flavoring substance is permitted in the EU depends on its inclusion on the Union list of flavorings and any conditions of use established through the regulatory process. Where direct evaluations exist or where harmonization with international standards is adopted, cinnamaldehyde ethylene glycol acetal may be regarded as acceptable for use in food products when supported by appropriate safety data.

Taste And Functional Properties

Cinnamaldehyde ethylene glycol acetal is characterized by aromatic qualities that lend itself to sensory applications in food. The compound has a spicy, warm, and cinnamon-like aroma and flavor profile that is typical of cinnamyl derivatives, albeit with subtle differences due to its acetal functional group. In sensory evaluation, compounds of this class are often described as providing nuanced spicy and sweet notes that complement flavors in foods such as confectionery, baked goods, and beverage systems. The sensory impact is achieved even at low use levels, reflecting the potency of many flavoring agents. From a functional standpoint, the presence of the cyclic acetal structure affects its physicochemical behavior in ways that are relevant for formulation scientists. The compound is generally insoluble in water but exhibits solubility in oils and organic solvents, which influences how it interacts with food matrices. This property can be advantageous when flavoring lipid-rich or emulsion-based products, where the flavor component needs to distribute effectively without adversely affecting texture or appearance. Additionally, its stability under mildly acidic conditions can make it suitable for products with varying pH, although under strongly acidic environments it may hydrolyze to release cinnamaldehyde and ethylene glycol. The volatility of flavoring compounds also plays a role in functional properties. Cinnamaldehyde ethylene glycol acetal is less volatile than simple aldehydes, which can contribute to a more sustained flavor release over the course of consumption or storage. This characteristic can be valuable in products such as chewing gum or long-lasting confectionery, where persistent flavor is desirable. The balance between sensory potency and functional stability is part of what makes this compound useful in specific applications, and it underscores the importance of understanding both taste attributes and chemical behavior in selecting flavoring agents.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) is central to understanding regulatory safety benchmarks for substances added to food. An ADI represents an estimate of the amount of a substance, expressed on a body-weight basis, that can be ingested daily over a lifetime without appreciable health risk. It is typically derived from toxicological studies in animals and incorporates safety factors to account for uncertainties in extrapolating data to humans. For flavoring substances such as cinnamaldehyde ethylene glycol acetal, formal ADI values may not always be established if expert committees determine that normal intake levels from food use do not raise safety concerns. In the case of cinnamaldehyde ethylene glycol acetal, evaluations by 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. This means that based on the available exposure data and toxicological information, typical human exposures through food are considered to be within safe bounds, and a formal numeric ADI may not be necessary. This type of assessment is consistent with how many flavoring substances are evaluated, where exposure at customary use levels is substantially lower than levels associated with adverse effects in toxicological studies. It is important to understand that ADI values serve as reference points for regulatory agencies and food manufacturers to ensure that consumer exposures remain safe over time. When an ADI is not explicitly defined but a no-concern determination is issued, it reflects a scientific judgment that routine consumption patterns do not present notable health risks. Therefore, the absence of a numeric ADI for this compound is not indicative of missing data but rather a regulatory conclusion based on comprehensive evaluation of evidence and expected use levels.

Comparison With Similar Additives

Cinnamaldehyde ethylene glycol acetal can be compared to other flavoring agents that share similar sensory functions, chemical features, or regulatory contexts. One substance for comparison is cinnamaldehyde itself, the primary aromatic aldehyde found in cinnamon oil. Cinnamaldehyde delivers strong spicy and sweet cinnamon notes, but it is more volatile and reactive compared to its acetal derivative. As a result, cinnamaldehyde may impart intense sensory effects at low concentrations, which can be desirable in some formulations but challenging in applications where controlled release or stability is important. Another comparable compound is benzaldehyde, an aromatic aldehyde that contributes almond-like flavor notes. Benzaldehyde propylene glycol acetal, a cyclic acetal analog of benzaldehyde, exhibits similar functional behavior to cinnamaldehyde ethylene glycol acetal in that the acetal form can influence volatility and release. These acetal derivatives are often chosen for applications requiring sustained sensory impact or specific stability characteristics. The comparison underscores how structural modifications to parent aldehydes can alter both sensory properties and functional roles in food formulations. A third related additive class is that of other cyclic acetal flavoring agents, which are used to provide stable aromatic notes in a range of food products. These compounds are selected based on their compatibility with food matrices, sensory contributions, and processing stability. While each compound has unique sensory nuances, they share the common feature of contributing defined aromatic characteristics suited to specific flavor profiles. Comparing cinnamaldehyde ethylene glycol acetal with these similar additives highlights how flavor chemists choose among available agents to achieve desired effects while managing formulation challenges such as volatility and interaction with other ingredients.

Common Food Applications Narrative

Cinnamaldehyde ethylene glycol acetal finds utility across a range of food and beverage applications that benefit from its characteristic spicy and cinnamon-like sensory profile. In confectionery products such as hard candy and sugar-based sweets, it can be incorporated to enrich the overall flavor and provide depth to spice-inspired formulations. Its functional properties allow it to integrate within sugar matrices where traditional volatile flavor compounds might dissipate too rapidly or impart unwanted sharpness. This can result in more balanced and rounded flavor experiences for consumers. In baked goods, such as spice breads, cookies, and pastries, cinnamaldehyde ethylene glycol acetal can contribute to warm and aromatic notes that complement ingredients like nutmeg, clove, and cinnamon. These products often undergo thermal processing, and the stability of the acetal form under certain conditions can help retain flavor integrity throughout baking. It may be blended with other flavor components to achieve a desired complexity in sensory output while maintaining consistency across production batches. Flavoring agents of this type are also used in chewing gum formulations, where long-lasting, warm spice characteristics enhance the chewing experience. Since chewing gum relies on gradual release of flavor over extended periods of mastication, compounds that are less volatile and bind well within the gum base are preferred. Beverages, particularly those with spice or herbal profiles, can also leverage the unique sensory contribution of this compound in minute concentrations to round out aromatic components without overwhelming the product. Additional applications may be found in savory seasoning blends and condiments where a hint of warmth and spiciness is desired. While used sparingly due to its potent nature, cinnamaldehyde ethylene glycol acetal supports the development of signature flavor profiles in multiple categories of food products. Its role is consistent with that of flavoring agents generally, which are incorporated in formulations designed to meet consumer taste expectations while aligning with safety and regulatory standards.

Safety & Regulations

FDA

  • Notes: In the US, 21 CFR 172.515 provides general conditions for synthetic flavoring substances; specific approval for this compound by name could not be confirmed from the d regulation.

EFSA

  • Notes: No specific EFSA flavoring evaluation deep link for this substance was identified.

JECFA

  • Year: 2000
  • Adi Display: No safety concern at current levels of intake when used as a flavouring agent

Sources

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