ALLYL NONANOATE

CAS: 7493-72-3 FLAVORING AGENT OR ADJUVANT

Allyl nonanoate is a synthetic flavoring ester used for fruity and cognac-like flavor notes in food. It is permitted under US regulation 21 CFR 172.515 as a synthetic flavoring substance or adjuvant.

What It Is

Allyl nonanoate is a synthetic flavoring agent or adjuvant with CAS number 7493-72-3 and is recognized by regulators for use in food flavorings. This compound belongs to the class of fatty acid esters, and it is identified by multiple synonyms including allyl pelargonate and nonanoic acid allyl ester. It has a characteristic sweet, waxy, fruity odor often described as cognac-like with pineapple and wine nuances. In food applications, it functions as a flavoring ingredient to impart or enhance pleasant sensory attributes that contribute to the overall taste profile of various products. The presence of allyl nonanoate in flavor formulations helps formulators achieve specific fruit-like notes that are difficult to replicate with natural extracts alone. The ingredient serves both functional and sensory roles in food and beverage formulations, providing aromatic complexity without significantly affecting nutritional content. Its designation in regulatory listings underscores its intended role as an additive that contributes to flavor rather than to nutrition or texture.

How It Is Made

Allyl nonanoate is synthesized through esterification, a chemical reaction in which nonanoic acid is reacted with allyl alcohol under controlled conditions. Catalysts such as sulfonic acid derivatives (for example naphthalene-beta-sulfonic acid) are often used to promote the formation of the ester linkage in laboratory or industrial settings. The resulting product is purified to meet food-grade specifications, where colorless to slightly yellow liquid with a fruity odor is obtained. Industrial production typically involves distillation or other refining steps to ensure the removal of unreacted starting materials and to achieve a consistent sensory profile. The manufacturing process emphasizes adherence to good manufacturing practices to ensure product safety and quality for subsequent use in food applications. Specifications and purity criteria are established by flavor industry compendia and international bodies engaged in flavor chemistry. Because it is not derived from a direct natural source for most commercial applications, strict process controls are applied to control impurities and to ensure reproducibility of flavor characteristics.

Why It Is Used In Food

Allyl nonanoate is used in food for its ability to contribute specific flavor notes that are fruity, waxy, and cognac-like in character. Flavorists and formulators incorporate it into blends to create or enhance tropical fruit profiles such as pineapple and melon, or to add complexity to confectionery and beverage flavors. Its utility lies in the consistency and intensity of the aroma and taste it provides at low use levels, enabling manufacturers to achieve desired sensory effects without relying solely on complex natural extracts. Because the compound is stable and miscible with many other flavor ingredients, it integrates well into liquid and semi-solid food systems. Its inclusion supports efficient flavor design, allowing product developers to tailor sensory experiences while maintaining formulation control. In addition, because it can be used "as the minimum quantity required to produce its intended effect" as outlined in regulatory practice, its contribution to overall ingredient composition can be minimized while still achieving the desired impact on flavor.

Adi Example Calculation

An illustrative example of how acceptable daily intake considerations might be applied would start with the notion that flavoring agents like allyl nonanoate are used at parts-per-million levels in finished foods. Assuming a hypothetical scenario where an average adult consumes multiple foods containing trace amounts of this flavoring over a day, the total intake would be calculated based on typical use levels and food consumption patterns. Because regulatory evaluations have concluded that there is no safety concern at current intake levels, this example underscores that actual daily intake from food is expected to be orders of magnitude below any level associated with adverse effects in toxicological studies. Such calculations help demonstrate the wide margin between typical dietary exposure and levels of concern rather than to define a precise limit.

Safety And Health Research

Safety assessments for allyl nonanoate have focused on its potential as a flavoring compound, considering available toxicological information and typical dietary exposure. Expert bodies such as JECFA have reviewed the compound’s profile in the context of flavor use and have reported no safety concern at current levels of intake based on available data, indicating that typical exposure from food applications does not raise safety issues. Safety studies underlying such evaluations examine endpoints including general toxicity, metabolism, and potential for adverse effects at levels substantially higher than those encountered in food. Because allyl nonanoate is used at very low concentrations to achieve desired sensory effects, estimated exposure tends to be well below levels associated with adverse effects in experimental studies. While detailed studies on specific health outcomes relevant to special populations may be limited, overall regulatory assessments provide a basis for its continued inclusion in flavor formulations. Handling data from material safety sources highlight that in concentrated form, the compound can be irritating to skin and eyes, and proper industrial hygiene measures should be applied during manufacturing and formulation.

Regulatory Status Worldwide

In the United States, allyl nonanoate is listed under 21 CFR 172.515 as a synthetic flavoring substance and adjuvant, permitting its safe use in food when used according to good manufacturing practice. This regulation outlines that such compounds should be used at the minimum amount necessary to achieve the intended sensory effect. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed this compound and concluded that there was no safety concern at typical intake levels when used as a flavoring agent, reflecting an international assessment of its safety profile.

Taste And Functional Properties

Allyl nonanoate contributes a distinctive fruity and waxy sensory profile in flavor formulations. At typical threshold levels, sensory descriptors include sweet, fruity nuances with hints of wine and creamy undertones. The ester’s aromatic properties make it effective for imparting tropical fruit-like notes and enhancing overall flavor richness without adding sweetness in the nutritional sense. In functional terms, it is soluble in ethanol and other organic solvents commonly used in flavor delivery, but it is essentially insoluble in water, which influences how it is incorporated into aqueous food systems. Its stability under typical processing conditions allows it to retain sensory qualities through formulation and storage, although like all volatile flavor compounds it can be susceptible to loss under prolonged heat or extreme pH. The compound’s sensory behavior is well-documented in flavor chemistry literature as suitable for complementing fruit and beverage profiles where layered aromatic nuances are desired.

Acceptable Daily Intake Explained

Acceptable daily intake (ADI) is a concept used by regulators to express the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, based on available scientific evidence. For flavoring agents like allyl nonanoate, expert committees may determine that no safety concern exists at levels typically consumed in food, and as such an explicit numeric ADI may not be established. Instead, the regulatory position reflects that exposure from normal use as a flavoring ingredient is expected to be far below any level of toxicological concern. It is important to understand that an ADI is a conservative estimate used for regulatory guidance and safety evaluation rather than a specific recommended intake for individuals. In practice, the compound’s use in foods is controlled by good manufacturing practice to ensure it is present only at the level needed to achieve its intended sensory effect, which keeps exposure within safe bounds.

Comparison With Similar Additives

Allyl nonanoate can be compared with other fruit‑type flavor esters such as ethyl butyrate, methyl anthranilate, and isoamyl acetate, all of which are used to create or enhance fruity flavor profiles in food products. Ethyl butyrate is often used for citrus and pineapple notes, while methyl anthranilate provides grape‑like character; isoamyl acetate contributes banana‑type flavor. Compared with these esters, allyl nonanoate tends to offer a more complex waxy and cognac‑like nuance, making it suitable for certain specific flavor profiles that other esters alone cannot achieve. While each of these compounds has a distinct sensory signature, their usage principles are similar: they are incorporated at low levels within flavor formulations to complement natural and other synthetic components. Like allyl nonanoate, regulatory acceptance of these compounds under relevant food additive or flavoring listings ensures they can be used within established practice for achieving targeted sensory outcomes.

Common Food Applications Narrative

Allyl nonanoate is incorporated into many blended fruit flavors used in beverages such as soft drinks and fruit juices, where its fruity, waxy, and cognac‑like character enhances overall aroma impressions. In confectionery, its presence in flavor blends contributes top‑note attributes that complement sugar and fruit acids, creating more vivid and appealing profiles in candies and chewing gum. Frozen desserts such as ice cream and sherbet may also include formulations with allyl nonanoate to achieve nuanced tropical fruit nuances not easily obtained through natural extracts alone. Additionally, it finds application in bakery fillings, dairy flavors, and certain savory products where layered aromatic complexity is desired. Its functional role in these applications lies in its ability to elevate sensory perceptions while being used at low concentrations, aligning with principles of good manufacturing practice. Over decades of flavor industry use, this compound has become a tool for flavorists to achieve consistent and appealing sensory effects in diverse product categories.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA numeric values not explicitly verified

JECFA

  • Year: 1996
  • Notes: JECFA concluded no safety concern at current levels of intake

Sources

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