CITRONELLOXYACETALDEHYDE

CAS: 7492-67-3 FLAVORING AGENT OR ADJUVANT

Citronelloxyacetaldehyde is a synthetic flavoring agent in the class of aldehydic flavour compounds. It is used as a floral and citrus top-note in food and beverage formulations and is listed under FDA food additive regulations with use governed by good manufacturing practice.

What It Is

Citronelloxyacetaldehyde is a synthetic flavoring agent or adjuvant characterized by a floral and aldehydic aromatic profile. The compound has the Chemical Abstracts Service registry number 7492-67-3 and is recognized by flavor industry bodies, including the Flavor and Extract Manufacturers Association (FEMA) as FEMA 2310 and by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) as JECFA number 592. This compound is typically described as a colorless to pale yellow liquid with a potent sweet, floral aroma reminiscent of honeysuckle or muguet. As an aldehydic compound, citronelloxyacetaldehyde belongs to a broader class of oxygenated organic compounds that contribute specific sensory characteristics, such as freshness and floral complexity, when incorporated into flavor blends. The structural features of the molecule include an aldehyde functional group and a citronellyl ether moiety, which together influence both its aromatic output and its functional behavior in food matrices. In regulatory contexts, citronelloxyacetaldehyde appears in lists of permitted synthetic flavoring substances under specific sections of the United States Code of Federal Regulations. The compound is permitted for direct addition to foods under the conditions articulated for synthetic flavoring substances and adjuvants, which emphasizes usage at the minimum level necessary to achieve the desired organoleptic effect and adherence to good manufacturing practice. The presence of this substance on authoritative lists of flavoring agents signifies that expert panels have evaluated it within established frameworks for flavor ingredient safety assessment. Citronelloxyacetaldehyde does not have an International Numbering System (INS) value commonly d for color additives or preservatives, but its FEMA and JECFA identifiers provide industry-standard references for its classification and use. These identifiers support consistent communication in regulatory filings, ingredient specifications, and safety evaluations across multiple jurisdictions.

How It Is Made

Citronelloxyacetaldehyde is synthesized through organic chemical reactions that construct the aldehyde functional group and ester linkages characteristic of its structure. At a general level, chemists prepare this compound by reacting appropriate precursors that introduce the citronellyl moiety and the acetaldehyde component. Traditional methods involve condensation reactions between halogenated intermediates and alcoholates, where ethyl or other alkyl alcoholates act as nucleophiles to displace leaving groups on brominated or chlorinated aldehyde precursors. For example, a citronellyl bromide derivative may be reacted with sodium or potassium alcoholates to form the desired ether linkage, and subsequent controlled hydrolysis yields the aldehyde group. Such reactions require careful control of temperature, solvent systems, and catalysts to favor the desired product and minimize byproducts. After synthesis, the raw material typically undergoes purification processes such as distillation, crystallization, or chromatographic separation to achieve a specified purity level suitable for flavor use. The purity control is essential because residual impurities can alter the sensory properties or raise safety concerns. Industrial and laboratory practitioners may tailor purification steps to meet analytical specifications established by regulatory and industry bodies, such as those maintained in food additive dossiers or flavor ingredient compendia. The final material is usually handled in concentrated form or diluted in solvent carriers that moderate its intense aroma and facilitate safe incorporation into flavoring blends. Quality assurance protocols, including spectroscopy and chromatography, validate the structural identity and concentration of citronelloxyacetaldehyde in production batches. Safety data sheets accompanying technical shipments provide guidance on handling, storage, and protective measures, reflecting standard chemical safety practices rather than food usage instructions.

Why It Is Used In Food

Citronelloxyacetaldehyde is used in food systems to impart or enhance specific sensory attributes that are difficult to achieve with natural ingredients alone. Flavor chemists often seek compounds that provide distinct top-notes or bridge gaps in flavor profiles, especially in complex formulations like beverages, confections, or bakery products. The aldehydic nature of citronelloxyacetaldehyde contributes crisp, floral, or citrus-like nuances that can accentuate freshness or floral character when perceived by the human olfactory system. In this way, the compound plays a role similar to other aldehydic flavoring agents used at low concentrations to refine and balance overall flavor impressions. From a formulation perspective, synthetic flavoring agents like citronelloxyacetaldehyde offer consistency of supply, defined sensory profiles, and flexibility in blending compared to some natural extracts, which can vary with botanical source and harvest conditions. Food manufacturers may select specific synthetic agents to achieve targeted flavor profiles that resonate with consumer expectations for certain product categories, such as floral-infused beverages or lightly scented confectionery. Citronelloxyacetaldehyde’s presence in regulatory lists of permitted flavoring agents indicates that expert bodies assessed it for safety under prescribed conditions of use and found that current intake levels do not raise safety concerns. Within formulations, the compound is typically used at the lowest effective concentration necessary to contribute its sensory effect and in combination with other flavor ingredients to produce harmonious outcomes. This targeted use aligns with principles of good manufacturing practice, which minimize additive use while achieving desired product quality.

Adi Example Calculation

To illustrate the concept of acceptable daily intake in a hypothetical manner (not specific to citronelloxyacetaldehyde), imagine a substance with an established ADI of 5 mg per kilogram of body weight per day. If an adult weighing 70 kilograms consumes foods containing this additive, multiplying the ADI by body weight yields a daily intake limit of 350 mg. In practice, actual exposure from typical food consumption patterns for flavoring agents is far lower because these substances are used at trace levels. This example demonstrates how ADI values translate across body weights and underscores that actual exposures are usually orders of magnitude below hypothetical limits when substances are employed in compliance with good manufacturing practice. For substances like citronelloxyacetaldehyde that lack a specifically defined numeric ADI, the illustration serves to explain how ADIs function rather than to prescribe a numeric benchmark for this compound. In general, flavoring agents are used milligram or microgram levels per serving, and dietary exposure estimates account for the sum of contributions across all food categories. Regulatory assessments consider typical intake patterns and compare them against safety data to determine whether there is cause for concern. In contexts where numeric ADIs exist, they provide a structured way to evaluate cumulative intake, but the underlying principle remains consistent: ensure that consumer exposure remains well below levels associated with adverse effects in toxicological studies.

Safety And Health Research

Safety evaluation of food additive substances, including synthetic flavoring agents like citronelloxyacetaldehyde, typically involves reviewing available toxicological data, exposure estimates, and chemical properties to determine whether their use under defined conditions poses concerns for human health. Expert panels, such as those convened by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), gather and assess data on absorption, metabolism, potential toxic effects, and dietary exposure. In the case of citronelloxyacetaldehyde, JECFA evaluations have concluded that no safety concern arises at current levels of intake when used as a flavoring agent, indicating that available data did not suggest adverse effects within the context of expected consumption patterns. Such conclusions are based on a weight-of-evidence approach that integrates multiple sources of information, including acute toxicity data and structural considerations of analogous compounds. Toxicological studies for flavoring substances often include assessments of acute oral toxicity, where high-dose exposures in animal models help characterize general toxicity thresholds; genotoxicity tests, which evaluate whether a compound has the potential to damage genetic material; and other endpoint evaluations such as subchronic or developmental studies when data are available. For many flavoring agents, including ones evaluated in group assessments, specific long-term data may be limited, and expert bodies rely on structural similarity to other compounds and existing data to make safety judgments. In the absence of definitive evidence indicating harm at estimated dietary exposures, expert panels apply safety factors and conservative assumptions to conclude that use at low levels, consistent with sensory needs and good manufacturing practice, does not present a public health concern. It is important to emphasize that such evaluations do not imply nutritional benefit but rather focus on ensuring that use as a flavoring agent does not meaningfully contribute to risk under intended conditions of use.

Regulatory Status Worldwide

Citronelloxyacetaldehyde is recognized within the regulatory frameworks that govern the use of synthetic flavoring substances in foods. In the United States, it is included under the category of synthetic flavoring substances and adjuvants that may be safely used in food when utilized at the minimum level required to produce the intended effect and in accordance with all principles of good manufacturing practice, as outlined in Title 21 of the Code of Federal Regulations, section 172.515. These provisions set forth conditions under which such flavoring agents are permitted without specifying quantitative limits for each individual substance, provided manufacturers adhere to good practice. The listing indicates that regulatory authorities have established a general allowance for this class of compounds, including citronelloxyacetaldehyde, within the context of permissible direct additions to food products under appropriate conditions. Internationally, citronelloxyacetaldehyde appears in evaluations conducted by expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA). JECFA’s evaluations of flavoring agents include assessments of technical function, exposure, and toxicological data. According to JECFA summaries, this compound was evaluated and described as having no safety concern at current levels of intake when used as a flavoring agent. Such evaluations provide a reference point for regulatory authorities and industry stakeholders in countries that align with or consider JECFA’s scientific conclusions in their own regulatory decision-making processes. While it does not carry a specific International Numbering System (INS) designation widely used for some food additives, its inclusion in JECFA and FEMA listings supports its regulatory recognition. Regulatory frameworks in other regions, such as the European Union, may consider assessments by bodies like the European Food Safety Authority (EFSA) in group evaluations of structurally related flavoring substances, but specific numeric authorization or E-number assignment for this compound alone is not universally established. The absence of explicit numeric limits reflects reliance on expert assessments and good manufacturing practice rather than fixed maximum use levels in every regulatory domain.

Taste And Functional Properties

Citronelloxyacetaldehyde is valued primarily for its distinctive sensory contributions. Organoleptic evaluations describe it as having a fresh, floral, and slightly citrus-tinged aroma that resembles floral notes like honeysuckle or muguet. These aromatic characteristics make the compound particularly useful for imparting or enhancing subtle floral nuances when blended with other flavor components. The aldehydic group in its structure is responsible for its sharp, clean top-notes, while the citronellyl portion modulates the overall olfactory impression, balancing floral sweetness with a hint of citrus-like freshness. Functionally, citronelloxyacetaldehyde behaves as a volatile aromatic compound. Its volatility contributes to the perception of aroma upon consumption, even at low concentration levels. While the compound is not water-soluble, it dissolves readily in organic carriers such as ethanol, propylene glycol, or other solvents typically used in flavor formulations. This solubility profile supports its integration into flavor bases intended for aqueous food systems or alcohol-containing beverages. Temperature and pH conditions common in food processing may influence the stability of aldehydic flavoring agents, but under normal usage situations, citronelloxyacetaldehyde maintains its aromatic integrity when incorporated appropriately. Sensory scientists and flavorists account for these functional behaviors when designing flavor blends, ensuring that the compound’s contribution persists through processing and storage without imparting off-notes or experiencing significant degradation. The perception of taste and aroma is multifaceted, and citronelloxyacetaldehyde’s role is specifically tied to its ability to reinforce or accentuate desirable aromatic qualities rather than to contribute sweetness or mouthfeel directly.

Acceptable Daily Intake Explained

The concept of an acceptable daily intake (ADI) is a tool used by regulatory and expert bodies to describe a level of daily exposure to a food additive that is considered safe over a lifetime. When numeric ADIs are established, they represent an exposure estimate that, based on available toxicological data and incorporation of safety factors, is unlikely to pose health risks for the general population. For many flavoring agents, especially those evaluated in group assessments by expert committees, specific numeric ADIs may not be individually defined. Instead, evaluators determine whether there is a safety concern at current exposure levels based on typical use patterns and available toxicological data. In the case of citronelloxyacetaldehyde, while evaluators have concluded that there is no safety concern at current intake levels, specific numeric ADIs have not been assigned in publicly accessible summary evaluations. This reflects the nature of flavoring assessments, where the focus is on whether exposure from typical use is sufficiently low relative to any hazard indicators to warrant unrestricted use under good manufacturing practice. The absence of a precise numeric ADI does not indicate an absence of safety consideration; rather, it reflects that exposure at the levels typically encountered in food is well below thresholds of toxicological concern. When expert committees do assign numeric ADIs for other additives, those values incorporate generous safety margins to account for uncertainties and differences between test animals and humans. In practical terms, manufacturers design formulations to achieve desired sensory effects using minimal quantities, further ensuring exposures remain well below any thresholds that would prompt regulatory concern.

Comparison With Similar Additives

Citronelloxyacetaldehyde shares functional similarities with other aldehydic flavoring agents that contribute floral, citrus, or fresh top-notes in food formulations. For example, citral, another aldehydic compound, delivers citrus aroma characteristics and is widely used in beverages, confectionery, and bakery applications. Both compounds act at low concentrations to enhance or modify sensory impressions but differ in their specific aromatic profiles; citral leans more toward lemon-citrus notes, while citronelloxyacetaldehyde emphasizes floral and muguet-like nuances. Their use underscores how slight variations in molecular structure produce distinct sensory outcomes and support diverse flavor design strategies. Similarly, compounds such as heliotropin (piperonal) and benzaldehyde are aromatic aldehydes used for vanilla-like or almond-like notes, respectively. While benzaldehyde imparts nutty almond character and heliotropin offers sweet floral impressions, citronelloxyacetaldehyde’s profile is uniquely floral and lightly citrus, making it complementary rather than interchangeable with these agents. Flavorists combine such compounds strategically to achieve balanced and multi-dimensional profiles in complex products. Another structurally related class includes acetals of aldehydes, which can extend sweetness perception or add depth to fruit notes. Comparing these compounds illustrates how ingredient selection depends on the desired final sensory impression and reinforces the role of diverse aromatic building blocks in flavor design. Across these comparisons, regulatory evaluations and usage guidelines for each substance guide their safe incorporation into food products under good manufacturing practice.

Common Food Applications Narrative

Citronelloxyacetaldehyde finds its primary application in food categories where subtle floral or citrus nuances can enhance the overall flavor perception. In beverage formulations, especially those aiming for a crisp, refreshing profile, adding trace amounts of floral aldehydic compounds like citronelloxyacetaldehyde helps round out citrus or fruit-derived notes and contributes to a more memorable sensory experience. The compound’s volatile nature allows it to be perceived quickly upon consumption, supporting first impressions of freshness and complexity. Confectionery products that incorporate floral or citrus-inspired themes may also leverage this compound to achieve nuanced top-notes that complement sugar and fruit flavors. For example, hard candies or flavored gums designed around floral or garden-inspired concepts might include trace amounts of this flavoring agent to reinforce thematic sensory cues. In bakery items, especially those with fruit or citrus profiles, flavorists may use citronelloxyacetaldehyde sparingly to elevate background notes without overpowering the primary character of the food. Its integration with other flavoring acids, esters, and aldehydes can produce balanced sensory impressions in products such as pastries, sweet rolls, or breakfast cereals that feature complementary fruit notes. Additionally, dairy-based desserts, such as frozen treats or custards with fruit or floral themes, can benefit from the compound’s aromatic properties when used judiciously. Across these applications, manufacturers adhere to regulatory guidance and good manufacturing practice by employing the compound only at levels necessary to achieve the targeted sensory effect and by considering consumer expectations for flavor authenticity and balance. Sensory panels and analytical assessments guide the precise use levels to ensure that the compound enhances the overall flavor profile without introducing unintended or overpowering sensory elements.

Safety & Regulations

FDA

  • Notes: Citronelloxyacetaldehyde is permitted under synthetic flavoring substances and adjuvants with conditions of good manufacturing practice but a specific approval decision record was not found.
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: No specific EFSA numeric ADI or E-number found; it may be included in group evaluations.

JECFA

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

Sources

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