9-DECENAL

CAS: 39770-05-3 FLAVORING AGENT OR ADJUVANT

9-DECENAL is an aliphatic unsaturated aldehyde used as a flavoring agent noted for its aldehydic and floral aroma, evaluated by flavoring panels and international safety committees.

What It Is

9-DECENAL is a defined chemical compound with the designation CAS 39770-05-3, classified within the family of aliphatic aldehydes used in the flavor and fragrance industries. Its structure comprises a ten-carbon chain with a terminal aldehyde group and a carbon-carbon double bond at the ninth position relative to the aldehyde function. This chemical identity confers specific olfactory characteristics that are exploited in food and beverage flavor formulations. The compound is also referenced in flavor ingredient libraries and by flavoring experts with an associated FEMA number (3912) reflecting its evaluation within professional flavoring panels. Its presence in natural sources and its synthetically derived counterparts are valued for the sensory nuances they impart, often described in technical literature as contributing aldehydic, floral, waxy, and dewy aromatic notes to complex flavor profiles. 9-DECENAL’s classification as a flavoring agent or adjuvant underscores its role in modulating or enhancing sensory perception in consumable products. In regulatory contexts, 9-DECENAL appears in inventories maintained by authoritative bodies that evaluate food substances, indicating its recognition in official flavoring databases. It is not assigned an E-number as a food additive in the European Union regulatory framework but remains recognized as a flavoring substance by scientific expert committees. The International Numbering System (INS) may list many flavoring agents, but for 9-DECENAL specifically, this information requires direct lookup in dedicated databases. Its other names and synonyms, such as dec-9-enal and costenal, reflect nomenclatures encountered in both scientific and industry references, reinforcing clarity for ingredient identification across technical documents and material specifications.

How It Is Made

9-DECENAL can be sourced from natural extracts where it occurs at trace levels in certain plant-derived oils and fruits, contributing to characteristic aromas in botanical matrices. In practice, industrial supply of this compound predominantly relies on controlled chemical synthesis tailored to yield high-purity product consistent with flavor formulation standards. A common synthetic route involves the oxidation of precursor alcohols, such as alkenyl alcohols with appropriate chain lengths, under catalytic conditions to yield the desired unsaturated aldehyde. Alternative chemical pathways use organometallic reagents or olefin functional group transformations to install the aldehyde in the terminal position relative to the carbon chain. Manufacturing at commercial scale is performed under conditions that mitigate side reactions and ensure product meets defined purity criteria for intended applications in flavors and fragrances. Purification techniques such as distillation under reduced pressure and crystallization may be employed to isolate and refine the aldehyde while controlling for potential degradation. Industry specifications often call for analytical verification of composition using gas chromatography and mass spectrometry corroborating identity and concentration of 9-DECENAL in production batches. While synthetic routes afford consistency, extraction from natural sources remains a research interest for ‘nature-identical’ flavor designations, though the yield from botanical matrices is typically low and extraction processes are more complex. Regardless of origin, producers subject bulk materials to quality assurance processes to ensure compliance with safety assessments and functional requirements, reflecting good manufacturing practices in the flavor ingredient sector.

Why It Is Used In Food

The technical utility of 9-DECENAL in food and beverage applications arises from its distinct aromatic characteristics, which can complement and enhance flavor profiles in complex mixtures. Flavor chemists exploit its aldehydic and floral notes to impart nuance in products aiming to evoke citrus, botanical, or dewy aromatic impressions. When formulated at levels consistent with sensory thresholds and regulatory safety evaluations, 9-DECENAL can balance or round out a blend, adding depth to fruity, herbal, or floral flavor constructs. Its adoption in food flavorings is motivated by the need to represent certain natural flavor dimensions that may be absent or subdued in base ingredients. The molecule’s volatility and odor qualities make it suitable as a note in top or middle aroma layers, particularly in liquid applications where volatile components contribute to initial flavor impressions. Because flavor formulation is an art and science, components like 9-DECENAL are chosen for how they synergize with other volatile compounds to deliver a target sensory experience. Moreover, its use as an adjuvant underscores its role in modulating the overall perception of a flavor blend rather than serving as a sole defining note, allowing flavorists to craft profiles that are rich, rounded, and consistent across production lots.

Adi Example Calculation

As an illustration of how ADI concepts are applied in safety assessment, consider a hypothetical body weight. Suppose a regulator established a numeric ADI for a flavoring agent of X mg per kilogram of body weight per day. For an adult weighing 70 kilograms, the total allowable intake under that ADI would be calculated by multiplying the ADI value by the body weight. For example, if the ADI were Y mg/kg body weight, the total allowable daily intake for a 70 kg individual would be Y times 70. This simple multiplication underscores how ADIs scale with body mass and provide a context for estimating exposure relative to safety benchmarks. In the case of 9-DECENAL, because a numeric ADI has not been explicitly assigned in publicly available regulatory evaluations, this calculation remains a conceptual example rather than a direct application to this specific additive. The broader point remains that ADIs provide a structured way to contextualize chemical exposure from foods and guide industry and regulatory decision-making.

Safety And Health Research

Safety evaluation of food flavoring agents like 9-DECENAL focuses on understanding exposure relative to toxicological thresholds, encompassing assessments of genotoxicity, repeated-dose toxicity, and metabolic handling. International expert committees consider available data from chemical characterization, structure-activity analyses, and available toxicology studies when formulating their conclusions. For 9-DECENAL, evaluations by panels such as those convened under the Joint FAO/WHO Expert Committee on Food Additives have determined that at typical use levels in flavor formulations there is no indication of safety concern, recognizing the compound’s chemical structure and anticipated exposure scenarios. Although specific quantitative toxicological endpoints such as reference doses or ADIs were not explicitly specified in publicly accessible summaries, the qualitative assessment reflects a consensus that exposure through normal flavor use patterns does not pose undue risk. This type of evaluation incorporates conservative assumptions around daily intake and margin of safety, aligning with established risk assessment paradigms for flavoring agents. Wider scientific literature may explore reactivity and biochemical interactions of aldehydes broadly, but regulatory assessments remain the authoritative basis for safety characterization in food contexts.

Regulatory Status Worldwide

9-DECENAL has been evaluated by expert panels and international safety bodies concerning its use as a flavoring agent. In the United States, this compound is represented in flavor ingredient inventories that reflect submissions to the FDA Office of Food Additive Safety and has an associated FEMA number (3912) indicating review by the Flavor and Extract Manufacturers Association expert panel. The presence in the FDA Substances Added to Food inventory signals recognition of its use as a flavoring substance but does not equate to an explicit regulation section in the Code of Federal Regulations with numeric specifications. As a result, definitive CFR citations for direct authorization are not established in this summary, and regulatory interpretation notes reflect this context. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated 9-DECENAL and concluded that at current levels of intake as a flavoring agent there is no safety concern, supporting its continued use within flavoring applications. However, specific numerical acceptable daily intake (ADI) values were not assigned in publicly available summaries, and the expert evaluation remains a qualitative endorsement of safety under intended conditions of use. Within the European regulatory framework, 9-DECENAL is recognized as a flavoring substance but does not have an assigned E-number for food additive labeling, with its usage guided by flavor industry standards and safety evaluations rather than explicit quantitative maximum use levels in regulation. This regulatory landscape underscores the importance of adherence to local labeling requirements and safety assessments by competent authorities in jurisdictions where products are marketed.

Taste And Functional Properties

9-DECENAL’s functional profile in flavor applications is grounded in its sensory impact rather than nutritive contribution. Organoleptically, it is associated with aldehydic, floral facets that may be reminiscent of citrus or rose-like impressions, which can be desirable in certain flavor categories. Its volatility at typical processing and consumption temperatures allows aroma delivery during consumption, influencing taste perception through retronasal olfaction. The functional behavior of 9-DECENAL is influenced by its chemical structure; the unsaturated aldehyde group imparts reactivity that formulation experts manage carefully to avoid undesirable interactions with other reactive components. In terms of physical properties, 9-DECENAL is generally poorly soluble in water but exhibits solubility in ethanol and other organic solvents common in flavor premixes, enabling its integration into liquid and emulsified flavor systems. Stability considerations around pH and heat exposure inform how and when it is incorporated during processing, with flavorists often recommending addition after heat-intensive steps to preserve volatile character. Because unsaturated aldehydes can be sensitive to oxidation, proper storage conditions including low temperatures and inert atmospheres extend shelf life and maintain consistent sensory properties. These functional considerations contribute to decisions about formulation sequencing and product type suitability when deploying 9-DECENAL in consumer products.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) is central to understanding how regulators frame the safety of additive use in foods. 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. For many flavoring agents, expert committees such as JECFA review available toxicology data to determine whether assigning a numerical ADI is warranted or whether qualitative conclusions about safety at expected exposure levels suffice. For 9-DECENAL, the conclusion of no safety concern at current intake levels reflects that anticipated exposure from flavor use is low relative to any thresholds of toxicological significance, and thus a specific numerical ADI was not derived in public summaries. It is important to emphasize that an ADI is not a recommendation for consumption but a regulatory tool used to assure that habitual intake remains within bounds judged unlikely to lead to adverse effects. When numeric ADIs are set by regulators for food additives, they incorporate large safety factors to account for uncertainties in data and differences across populations. In the case of flavoring agents evaluated without a numeric ADI, the qualitative conclusion of safety at intended use levels serves a similar protective role, guiding industry practice and regulatory oversight to maintain consumer safety.

Comparison With Similar Additives

Comparing 9-DECENAL with other flavoring aldehydes such as citral and vanillin highlights differences in sensory profiles, functional use, and regulatory characterization. Citral, a mixture of geranial and neral isomers, delivers strong citrus aroma and has a long history of use in flavor and fragrance applications with established safety evaluations, including specific numeric ADIs in some jurisdictions. Vanillin, another aldehyde, provides a sweet vanilla note and likewise benefits from extensive regulatory review with defined intake benchmarks. In contrast, 9-DECENAL’s sensory profile leans toward floral and botanical notes that may be less dominant but valuable in nuanced flavor constructs. Regulatory evaluations for these compounds reflect their different use patterns and available toxicology data, with some flavoring agents having numeric ADIs and well‑characterized exposure assessments, while others like 9-DECENAL are assessed qualitatively as safe at intended use levels.

Common Food Applications Narrative

In the context of food product formulation, 9-DECENAL finds role as a nuanced flavoring component in diverse categories where its aldehydic and floral aromatic contributions support broader sensory goals. For example, in beverage flavor systems—particularly those seeking light citrus or herbal notes—this ingredient can provide complementary aromatic lift, reinforcing perceptions of freshness or complexity. Likewise, in confectionery and dairy flavor blends aiming to evoke floral or fruit nuances, the judicious inclusion of 9-DECENAL contributes to a more layered and engaging flavor experience. Its use is most often in combination with other flavor compounds, where each ingredient’s role is calibrated to achieve a balanced sensory profile that resonates with consumer expectations for natural or nature-like tastes. Beyond beverages and confections, savory applications that incorporate subtle aromatic notes, such as dressings or sauces with botanical undertones, can benefit from the strategic addition of this compound. In these settings, 9-DECENAL may accentuate herbal or citrus facets without dominating the overall flavor impression, providing depth and reinforcing the theme of the product’s taste concept. Because of its volatility and olfactory impact, flavorists often place 9-DECENAL in the top or middle notes of a flavor formulation, ensuring initial impressions align with the intended profile. Despite its utility, its inclusion is always governed by sensory evaluation, regulatory safety assessments, and functional compatibility with processing conditions, resulting in judicious and informed application across food categories.

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Safety & Regulations

FDA

  • Notes: No explicit CFR section found; recognized in Substances Added to Food inventory but specific approval details not located.

EFSA

  • Notes: No specific EFSA evaluation with numeric ADI found in authoritative sources.

JECFA

  • Notes: JECFA evaluation concluded no safety concern at current intake levels but did not assign a numeric ADI in the publicly accessible summary.

Sources

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