CIS-3-HEXENYL ACETOACETATE

CAS: 84434-20-8 FLAVORING AGENT OR ADJUVANT

CIS-3-HEXENYL ACETOACETATE is a synthetic flavouring agent evaluated by international food additive bodies primarily for use as a flavouring component in food and beverage formulations.

What It Is

CIS-3-HEXENYL ACETOACETATE is a chemical compound characterized by the CAS number 84434-20-8 that is used as a flavouring agent or adjuvant in various food and beverage applications. Chemically, it belongs to a class of esters derived from butanoic acid and hexenyl alcohol moieties. The compound is recognized for its sensory contribution to flavours described as green, earthy, and faintly floral in character when used at low concentrations in food systems. It is identified under a variety of synonyms, reflecting different naming conventions in chemical and flavour industry references, and is indexed in major chemical databases with PubChem CID 20836219. The structural identity and technical function of CIS-3-HEXENYL ACETOACETATE distinguish it from simple esters used for aromatic purposes. In regulatory contexts, this compound has been evaluated by expert scientific committees, and it is generally encountered in inventories of flavouring substances rather than in explicit additive regulations prescribing quantitative use levels in specific foods. The flavour industry and scientific literature often classify it as a flavouring agent or adjuvant, indicating its role in enhancing or modifying sensory properties of food products. This classification is consistent across international references that document its properties and functional use in complex flavour formulations. The presence of this compound on authoritative inventories and databases underscores its relevance to professionals involved in food formulation and safety evaluation. As a flavouring substance, it is subject to ongoing review by committees such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA), which assesses safety concerns and provides statements regarding intake levels and current understanding of potential health implications.

How It Is Made

The manufacture of CIS-3-HEXENYL ACETOACETATE typically involves esterification reactions between an appropriate hexenyl alcohol and an acetoacetate derivative under controlled chemical synthesis conditions. In broad terms, an alcohol substrate containing a hexenyl moiety is reacted with acetoacetic acid or a reactive acetoacetate intermediate, often facilitated by catalysts and optimized reaction conditions to produce the desired ester linkage. Esterification is a well-established process in organic chemistry for producing flavour and fragrance compounds, and it is routinely applied in the flavour industry to generate a diverse array of esters with specific sensory effects. The production process emphasizes purity and consistency, as flavouring ingredients require well-defined quality attributes when incorporated into food products. After the initial synthetic reaction, the product typically undergoes purification steps such as distillation or chromatography to remove unreacted starting materials, catalysts, or by-products. Technical-grade CIS-3-HEXENYL ACETOACETATE is then analyzed to confirm identity, concentration, and absence of undesirable impurities. Quality control protocols are essential for flavouring agents to ensure reproducibility of sensory performance and compliance with relevant specifications. Manufacturers may adjust process parameters such as temperature, solvent choice, and reaction time to optimize yield and to meet specifications required for food-grade applications. Although specific proprietary methods can vary across producers, the general principles of ester synthesis and purification remain consistent. It is important to note that detailed procedural steps are considered confidential industrial information and are not typically disclosed in full in public regulatory documents. However, industry references and supplier data indicate that the compound is synthesized via standard chemical routes compatible with industrial-scale production of flavouring esters.

Why It Is Used In Food

CIS-3-HEXENYL ACETOACETATE is employed in food and beverage formulations primarily for its ability to contribute green and fresh flavour nuances to complex flavour profiles. Flavouring agents such as this compound are integral to creating desirable sensory experiences in a wide range of products, from baked goods to beverages, where small amounts of specific aromatic chemicals can significantly influence the overall taste impression. By providing a subtle green or earthy note, it enhances or complements other flavour components, leading to a balanced and appealing profile. Flavouring agents are chosen based on their sensory attributes, stability under processing conditions, and compatibility with other ingredients. CIS-3-HEXENYL ACETOACETATE, because of its chemical structure, tends to offer specific aroma characteristics that are valuable in certain flavour blends. The choice to incorporate it into a formulation is guided by sensory evaluation and consumer preference studies, with flavourists selecting substances that contribute targeted notes while avoiding off-flavours or interactions that could negatively affect product quality. Its use is most common in products where a fresh, green, or slightly floral note is needed to round out the overall flavour perception. Whether in non-alcoholic beverages, confectionery items, or other processed foods, the compound functions as part of a broader palette of flavouring agents used to achieve complex sensory goals. Regulatory evaluations of its safety at typical use levels support its continued application in food flavouring, although such uses are informed by expert review rather than prescriptive regulatory limits in many jurisdictions.

Adi Example Calculation

To illustrate how an ADI framework is applied, consider a hypothetical illustrative calculation based on a generic example. If an ADI were established for a flavouring agent at a notional value such as 1 mg per kilogram of body weight per day (this number is an example and not specific to this compound), a person weighing 70 kilograms could theoretically consume up to 70 mg of the substance per day over their lifetime without exceeding the ADI. In practice, actual exposure from food products is likely to be orders of magnitude lower because flavouring agents are used at very low concentrations in finished foods. Such example calculations help demonstrate how regulatory frameworks consider body weight and exposure levels relative to safety assessments. The key point is that ADIs incorporate conservative safety margins, and typical dietary exposure to flavouring agents like CIS-3-HEXENYL ACETOACETATE is limited by formulation practices and sensory thresholds rather than approaching any toxicological concern. This illustrative calculation is for conceptual understanding only and does not represent a recommendation of intake.

Safety And Health Research

The safety profile of CIS-3-HEXENYL ACETOACETATE has been reviewed by expert scientific committees that specialize in food additive evaluations. For flavouring substances, these committees assess a range of toxicological data, including studies on metabolism, acute toxicity, and results from genotoxicity assays where available. The primary regulatory evaluation conducted by JECFA concluded that there is no safety concern at current levels of intake when the compound is used as a flavouring agent, based on typical exposure from food use. This conclusion is based on assessments of the compound’s chemical structure, available toxicological information, and comparison with related substances that have been more extensively studied. Despite its inclusion in safety evaluations, definitive chronic toxicity or long-term human exposure studies specific to this compound are limited in publicly accessible databases. In such cases, expert committees rely on existing data, structural analog evaluations, and established thresholds of exposure that provide a margin of safety for consumers. The absence of overt safety concerns in the context of estimated intake levels is not the same as exhaustive evidence of safety at all intake levels; rather, it reflects a risk assessment framework where typical use patterns are considered unlikely to pose a health risk. It is important to emphasize that CIS-3-HEXENYL ACETOACETATE, like many flavouring agents, is used at very low concentrations, and routine dietary exposure is generally orders of magnitude below levels associated with toxicological effects in standard test systems. Current evaluations focus on ensuring that exposure remains within levels that do not raise concerns under informed risk assessment practices. Ongoing research in flavour chemistry and additive safety continues to refine understanding of how such compounds behave in biological systems, but authoritative bodies have not identified specific health hazards at levels consistent with normal use.

Regulatory Status Worldwide

Regulatory evaluation of CIS-3-HEXENYL ACETOACETATE has been conducted by international expert committees that review flavouring substances for safety. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) examined this compound as part of its evaluation of flavouring agents and concluded that there is no safety concern at current levels of intake when used as a flavouring agent. This statement reflects an expert review of available toxicological data relevant to typical dietary exposure scenarios but does not prescribe quantitative allowable levels in foods. The JECFA assessment is documented in its database under Chemical Number 1974, where the functional class is listed as a flavouring agent. The committee’s conclusions support the use of this compound within the context of customary flavouring practices. In the United States, the substance is listed in the FDA’s Substances Added to Food inventory (formerly known as EAFUS), which compiles ingredients that have been evaluated by expert bodies such as the Flavor and Extract Manufacturers Association (FEMA) and JECFA for their use as flavouring substances. Inclusion in this inventory indicates that the compound has been recognized as a flavouring agent of interest for food use, but it does not constitute an explicit approval under specific sections of the Code of Federal Regulations. Instead, its use is generally guided by the broader regulatory framework for food ingredients, where flavouring agents are permitted based on expert assessments of safety and customary use. In the European Union and other regions, similar expert reviews of flavouring agents are conducted, although specific listings or numbers such as E-numbers may not be assigned to all individual compounds, particularly those used at very low levels in complex flavour formulations. At present, no specific EU flavouring approval number (E-number) has been established for CIS-3-HEXENYL ACETOACETATE in publicly accessible regulatory documents, and comprehensive safety references are derived from international expert committee evaluations rather than prescriptive regulations.

Taste And Functional Properties

From a sensory perspective, CIS-3-HEXENYL ACETOACETATE is associated with notes that are often described as green, fresh, or mildly floral, imparting subtle aromatic contributions when used at low concentrations. These sensory attributes make it useful in flavour formulations where a natural or fresh character is desired. Because flavour perception is highly dependent on the context of other ingredients, the compound’s impact on taste often emerges in combination with complementary substances that balance sweet, sour, or other aromatic elements. Functionally, flavouring agents like this ester are typically volatile organic compounds that contribute to the olfactory component of taste. Their volatility and solubility characteristics influence how they release aroma molecules during consumption. CIS-3-HEXENYL ACETOACETATE can dissolve in lipid and aqueous phases depending on formulation context, and this solubility profile affects how it is perceived when a product is consumed. Heat and pH conditions encountered during food processing may also alter the compound’s stability, and such factors are considered by product developers to ensure the desired sensory properties are retained through manufacturing and storage. Although sensory descriptors like "green" or "earthy" provide a general idea of its contribution, the actual experience of taste and aroma can vary widely depending on matrix effects and interactions with other ingredients. The compound does not function as a sweetener, colourant, or preservative; instead, it specifically influences aroma and flavour perception. Food scientists often evaluate such compounds through sensory panels to determine optimal usage levels that achieve the intended flavour outcome without overpowering other characteristics of the product.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) refers to the estimated amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on established scientific evidence. ADIs are typically expressed in milligrams of the substance per kilogram of body weight per day and are derived from toxicological studies with conservative safety factors built in to account for uncertainties. For many flavouring agents, regulatory bodies such as JECFA evaluate whether sufficient data exist to establish a numerical ADI. In the case of CIS-3-HEXENYL ACETOACETATE, JECFA’s evaluation concluded that there is no safety concern at current levels of intake when used as a flavouring agent, which serves a similar function to an ADI determination by indicating that routine consumption at levels consistent with intended use is not expected to pose health risks. The concept of an ADI is not a recommendation that consumers should aim to ingest a particular amount of a substance; rather, it is a regulatory tool used to contextualize safety in the face of lifetime exposure. For flavouring agents used at very low levels, typical dietary exposure is often far below thresholds of toxicological concern identified by expert committees. Although a specific numeric ADI value has not been published for CIS-3-HEXENYL ACETOACETATE, the narrative conclusion provided by JECFA reflects a risk assessment outcome that integrates available data and uses established safety factors. This approach ensures that the compound’s use in food products aligns with principles of food additive safety and consumer protection.

Comparison With Similar Additives

CIS-3-HEXENYL ACETOACETATE can be compared with other ester-type flavouring agents that contribute specific aromatic notes to food products. For example, ethyl acetate is a common ester used for its fruity aroma in beverages and confectionery, whereas isoamyl acetate offers a banana-like note in similar applications. These compounds, like CIS-3-HEXENYL ACETOACETATE, are volatile organic esters with distinctive sensory characteristics that influence overall flavour perception. While ethyl acetate and isoamyl acetate are often used at higher levels due to broader flavour roles, CIS-3-HEXENYL ACETOACETATE’s contribution is more specialized, adding green or earthy nuances that are not typically provided by simpler esters. Another related compound is cis-3-hexenyl acetate, which also offers green, fresh notes and is used in aroma formulations. Each of these flavouring agents differs in volatility, sensory threshold, and functional role within complex flavour systems. The choice of one over another depends on the desired sensory outcome and compatibility with other flavour components. These comparisons highlight how flavour chemists select from a palette of esters and other volatile compounds to achieve targeted sensory profiles. Although they share structural similarities and functional purposes, differences in aroma character and sensory impact guide their use in specific product categories.

Common Food Applications Narrative

CIS-3-HEXENYL ACETOACETATE finds application in a range of food and beverage products where nuanced flavour profiles are desired. In beverage systems, for example, flavour formulators may include it as a component of complex blends that aim to evoke freshness or green notes, particularly in herbal or fruit essence-inspired drinks. Its subtle aromatic qualities can complement fruit-derived flavours or work in harmony with sweet or tangy notes to create a balanced sensory experience. In confectionery items, where multiple flavour ingredients interact to create a distinctive taste, this compound can add depth to tastes that lean toward natural, plant-like, or light floral attributes. Baked goods and snack foods also benefit from the inclusion of carefully selected flavouring esters. In these products, CIS-3-HEXENYL ACETOACETATE may contribute to layered flavour experiences that enhance consumer enjoyment. For example, when paired with other esters and flavour compounds, it can help round out flavour profiles that mimic fresh-baked or artisanal qualities. Its role in savoury seasoning blends, although less pronounced than in sweet or beverage applications, can also be relevant when subtle green or earthy notes are desired. The application of such flavouring agents extends to processed dairy products, ready-to-drink formulations, and other categories where aroma complexity supports brand positioning and consumer expectations. Because these compounds are used at very low concentrations due to their potent sensory characteristics, they are not detectable as standalone ingredients but rather contribute to the overall flavour ensemble crafted by food scientists. Inclusion of CIS-3-HEXENYL ACETOACETATE reflects the broader practice of using multiple flavouring agents to achieve specific sensory goals in modern food products, always within the context of safety evaluations and regulatory considerations.

Safety & Regulations

FDA

  • Notes: Inclusion in the FDA Substances Added to Food inventory does not itself indicate formal regulatory approval under specific CFR sections.

EFSA

  • Notes: No specific EFSA evaluation document with numeric ADI was found.

JECFA

  • Year: 2010
  • Notes: JECFA concluded no safety concern at current intake levels but did not assign a numeric ADI.

Sources

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