4-DECENOIC ACID

CAS: 26303-90-2 FLAVORING AGENT OR ADJUVANT

4-Decenoic acid is a straight chain unsaturated fatty acid with a fruity aroma used as a flavouring agent in foods.

What It Is

4-Decenoic acid is a naturally occurring unsaturated fatty acid that chemists and food scientists recognize by its CAS registry number 26303-90-2. It belongs to a class of organic compounds known as aliphatic carboxylic acids. The chemical backbone of 4‑Decenoic acid is composed of a ten‑carbon chain with a single carbon‑carbon double bond at the fourth carbon from the carboxyl group. This structural feature gives the molecule distinct physicochemical properties compared with saturated fatty acids. The compound has a fruity odor, which is the basis for its use as a flavouring agent or adjuvant in food and beverage products in some regulatory inventories. In food science, an ingredient’s technical function refers to the role it plays in the sensory or physical profile of a product. 4‑Decenoic acid’s classification as a flavouring agent or adjuvant means that it is added in small amounts to enhance or modify the aroma profile of a food, typically contributing a fruit‑like note. Although it is structurally similar to other fatty acids, its unsaturation and position of double bond distinguish it from common saturated acids such as decanoic acid (capric acid). The exact sensory perception of 4‑Decenoic acid can vary with concentration and the food matrix in which it is used. Because it is used at low levels and mainly for organoleptic purposes, 4‑Decenoic acid is categorized differently from nutrients or bulk food components. Its presence at trace levels in foods is often the result of natural occurrence in some raw materials, such as hop oil and beer, or intentional addition for flavouring. However, the regulatory status of 4‑Decenoic acid varies by region and is governed by expert evaluations rather than broad codified food additive lists in some countries. Its safety and allowed use conditions are therefore tied to regulatory inventories and expert committee evaluations rather than simple numeric limits.

How It Is Made

4‑Decenoic acid is typically prepared by organic synthesis methods that introduce a double bond at the fourth carbon in a ten‑carbon fatty acid chain. In research and industrial contexts, chemists often start with precursor hydrocarbons or shorter chain acids and extend and desaturate the chain using established organic reactions. Common laboratory approaches include Wittig reactions, catalytic hydrogenation with controlled partial desaturation, or olefin metathesis to achieve the desired positioning of the double bond, but the specific process varies with scale and manufacturer expertise. When produced at scale for use as a reagent or intermediate, 4‑Decenoic acid is purified to a high degree to remove byproducts and unreacted starting materials. Typical purification techniques in chemical production include fractional distillation under reduced pressure, recrystallization (when applicable), and chromatography. Purity specifications for reagents sold to industry often exceed 97–98% as determined by gas chromatography (GC) or other analytical techniques. Suppliers of 4‑Decenoic acid provide certificates of analysis (CoA) detailing identity, purity and measured physicochemical properties when available. Although there are no public monographs specifically for 4‑Decenoic acid in major pharmacopeias or food additive compendia, its production follows general principles of good manufacturing practice (GMP) in the chemical industry when destined for flavouring use. Manufacturers typically provide safety data sheets (SDS) that outline handling, storage, and transport precautions. Because 4‑Decenoic acid contains an unsaturated bond in an aliphatic chain, it is prone to oxidation if exposed to air and light; as a result, producers recommend storing the compound under inert atmosphere and away from heat to maintain quality. In research and flavour industry contexts, small‑scale batches are often synthesized directly in laboratories using validated methods to ensure consistency for experimental or sensory purposes.

Why It Is Used In Food

The primary reason 4‑Decenoic acid is used in food formulations is for its sensory contribution. Its fruity aroma profile makes it useful in flavouring applications where a light, fresh, or fruit‑like note is desirable. Food producers and flavour chemists tailor flavour profiles by combining multiple volatile compounds; 4‑Decenoic acid may be included in such blends to complement esters, aldehydes, and alcohols that contribute fruity or citrusy notes. In many cases, the use level of 4‑Decenoic acid is quite low because of its potent aroma and the fact that it is one component among many in complex flavour systems. In beverage applications, compounds like 4‑Decenoic acid may occur naturally in ingredients such as hops and can influence the aroma of beers, teas, and other brewed products. In flavored non‑alcoholic drinks, its inclusion can mimic or enhance natural fruit aromas. In confectionery and baked goods, it can also contribute to the overall aromatic character without imparting sweetness. As a flavouring adjuvant, it helps achieve a balanced sensory experience by rounding off sharp notes or adding depth to fruit flavour profiles. Because taste and aroma perception is subjective and influenced by the food matrix, processors work with flavour houses to determine optimal usage levels that enhance product appeal. Regulatory expert panels that evaluate such ingredients often consider how and why compounds are used in formulations, balancing the sensory benefits against safety evaluations from toxicological data and intake estimates. The designation of 4‑Decenoic acid as a flavouring agent or adjuvant reflects its role in changing or improving the sensory quality of food products rather than contributing nutritional value or preservation effects.

Adi Example Calculation

Because 4‑Decenoic acid does not have a numeric ADI established by regulatory expert committees, it is not possible to provide a numerical example calculation of daily allowable intake that aligns with regulatory values. An ADI example calculation typically involves multiplying a numeric ADI by an individual body weight to estimate how much of a compound could be consumed daily without appreciable health risk. In the absence of a numeric ADI for 4‑Decenoic acid, such a calculation cannot be demonstrated. Instead, the expert conclusion that there is no safety concern at current intake levels serves as the guiding principle for its use as a flavouring agent.

Safety And Health Research

Safety evaluations for flavouring agents like 4‑Decenoic acid focus on toxicological studies, structure‑activity relationships, and dietary exposure estimates rather than nutrient effects. Regulatory expert bodies such as JECFA review available data on absorption, metabolism, acute toxicity, genotoxicity, and other endpoints to determine whether typical levels of intake raise safety concerns. In the case of 4‑Decenoic acid, JECFA concluded there was no safety concern at current intake levels when used as a flavouring agent. This conclusion is based on peer‑reviewed evaluations and expert judgment rather than isolated animal studies or tentative hypotheses. Scientific research into the health effects of specific flavouring agents varies greatly in depth depending on how widely a compound is used and the volumes consumed. For 4‑Decenoic acid, the literature includes evaluations of sensory properties and flavour chemistry more often than detailed toxicology studies because its use levels are typically low. The absence of a numeric ADI from JECFA indicates that the committee did not identify toxicological thresholds that would limit its use within flavouring contexts at current exposure levels. As a result, there is no established health endpoint value such as an ADI that applies internationally. While typical food intake of flavour compounds is small relative to nutrients or contaminants, expert evaluations nonetheless consider basic hazard endpoints. These include ensuring that compounds do not show clear genotoxic potential and that there is adequate margin between intake and doses associated with adverse effects in animal studies. In the absence of robust evidence indicating harm, and given the expert committee conclusions, 4‑Decenoic acid is treated as low concern within the scope of normal food flavouring use.

Regulatory Status Worldwide

The regulatory status of 4‑Decenoic acid differs across regions and is tied to specific expert evaluations rather than broad generic listings. In the United States, the Food and Drug Administration (FDA) includes 4‑DECENOIC ACID in the Substances Added to Food database (formerly EAFUS) as a flavouring agent or adjuvant with a FEMA number 3914 and a JECFA flavour number 1287, reflecting its review by the Flavor and Extract Manufacturers Association’s expert panel. However, being listed in this inventory does not equate to a specific U.S. Code of Federal Regulations (CFR) food additive regulation; therefore, its explicit approval status in the CFR is not established. This means that while it appears in the FDA’s food substances inventory, it is not codified with a numeric regulation section under Title 21 of the CFR. Internationally, the World Health Organization’s Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated 4‑Decenoic acid as a flavouring substance under its number 1287. According to the JECFA database, the evaluation concluded that there is no safety concern at current levels of intake when used as a flavouring agent. JECFA’s assessment is based on toxicological and intake data and guides many national regulatory bodies in their own decisions. The JECFA evaluation does not establish a numeric acceptable daily intake (ADI) but instead provides a safety conclusion relevant to typical use levels. In some jurisdictions such as the European Union, flavouring agents may also fall under flavouring regulations, but specific E‑number assignments for 4‑Decenoic acid are not established in the Union list of flavourings. Because 4‑Decenoic acid is mainly evaluated as a flavouring spirit ingredient by expert panels rather than through prescriptive additive lists in codified food laws, manufacturers and processors should consult local food regulations and inventories to determine compliance requirements for their target markets.

Taste And Functional Properties

4‑Decenoic acid is characterized by a distinct fruity aroma, which is the basis for its use in flavour formulations. Sensory scientists describe this profile as light and fruit‑like, making it complementary to other aroma compounds in complex flavour blends. The acid has limited solubility in water but dissolves more readily in oil and other non‑polar phases, meaning it distributes differently depending on the product matrix. In aqueous foods, it may bind with other ingredients or require carriers to ensure even distribution. In lipid‑rich foods, its solubility can be higher, contributing to the overall aroma release when the product is consumed. The position of the double bond at the fourth carbon affects both the volatility and sensory perception of the molecule. Volatility influences how readily a compound contributes to aroma; more volatile molecules are released into the air above the food surface and detected by olfactory receptors. Because 4‑Decenoic acid has moderate volatility, it contributes aroma without being overwhelming, but the exact perception can depend on temperature, product composition, and concentration. Functionally, 4‑Decenoic acid does not act as a preservative, antioxidant, or structural component; its role is sensory. It does not contribute to texture or pH adjustment and is typically used at trace levels within flavouring formulations. When formulating with 4‑Decenoic acid, food scientists consider its stability under processing conditions such as heating and pH changes. Like many unsaturated fatty acids, it may undergo oxidation if exposed to heat and oxygen over time, which can alter its sensory properties. Therefore, its inclusion is often optimized for products with limited heat exposure or where packaging minimizes oxidation.

Acceptable Daily Intake Explained

In food additive regulation, an acceptable daily intake (ADI) is a health‑based guidance value representing the amount of a substance that can be consumed every day over a lifetime without appreciable health risk. ADIs are often expressed in milligrams per kilogram of body weight per day (mg/kg bw/day) and derived from toxicological studies with safety factors applied. However, for many flavouring agents—including 4‑Decenoic acid—the expert evaluations conclude that typical intake levels are so low that establishing a numeric ADI is not necessary. In the JECFA evaluation for 4‑Decenoic acid, the committee concluded there was no safety concern at current levels of intake when used as a flavouring agent, which effectively functions as a qualitative ADI determination without a specified numeric value. This qualitative determination means that, according to expert assessment of available data and common usage levels, there is no reason to set a specific numeric ADI for 4‑Decenoic acid. It differs from compounds with established numeric ADIs where measured toxicological thresholds require limiting intake. For consumers and manufacturers, this type of statement indicates that normal food use levels are expected to be safe based on current evidence and expert judgment. It does not imply that there is a recommended level of intake but rather that there is no identified hazard at typical usage rates documented in flavouring inventories and evaluations.

Comparison With Similar Additives

4‑Decenoic acid can be compared with other flavouring acids and aroma compounds that contribute fruity or citrus notes. For example, ethyl butyrate and methyl butyrate are ester compounds commonly used to impart fruity aromas in beverages and confectionery; these esters have established flavour use profiles and often numeric flavour inventory listings. Compared with these esters, 4‑Decenoic acid is a fatty acid rather than an ester, but both classes contribute to fruit‑like sensory profiles. Another point of comparison is with medium chain fatty acids such as decanoic acid (capric acid), which is a saturated ten‑carbon fatty acid with less pronounced aroma. While decanoic acid may influence flavour profiles in dairy and cheese products due to its own sensory characteristics, it is not typically used as a direct flavouring agent. The unsaturation in 4‑Decenoic acid alters its aroma character and volatility relative to its saturated counterpart. Finally, within the flavouring acid category, compounds such as hexanoic acid and octanoic acid are also used for specific sensory effects. These shorter chain acids tend to have stronger, sometimes pungent aroma notes and therefore are used at carefully controlled levels. In contrast, 4‑Decenoic acid’s aroma is lighter and more fruity, allowing it to be blended into complex flavour systems where a delicate fruit note is desired.

Common Food Applications Narrative

4‑Decenoic acid’s sensory properties make it a candidate for inclusion in a range of food and beverage products that benefit from nuanced aroma profiles. In the beverage industry, compounds with fruity notes are often used to create or enhance flavours in soft drinks, ready‑to‑drink teas, flavored waters, and non‑alcoholic cocktails. The compound may be found at trace levels in formulations where natural or artificial fruit flavours are blended to produce a desired aromatic complexity that appeals to consumers. In confectionery applications, subtle aroma compounds are key to achieving balanced chocolate, candy, and gum flavours. 4‑Decenoic acid might be included in flavour blends that aim to mimic or augment fruit essences in candies or in coatings for baked goods. Its fruity profile can also support berry, citrus, and tropical fruit character in dressings, sauces, and dessert toppings. In bakery products, aroma compounds influence the perception of freshness and fruitiness, particularly in items such as muffins, pastries, and breakfast cereals. Even though 4‑Decenoic acid is not a primary flavouring ingredient in mainstream foods, it contributes to the palette of aromatic compounds that food processors and flavour houses draw upon. Its use in niche or artisanal formulations can enhance consumer perception of natural‑like fruit aromas. Because flavour perception is complex and influenced by multiple compounds acting together, 4‑Decenoic acid is typically one part of a broader flavour strategy rather than a standalone ingredient.

Safety & Regulations

FDA

  • Notes: Not explicitly codified in CFR approvals; listed in FDA Substances Added to Food (formerly EAFUS).

EFSA

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

JECFA

  • Notes: JECFA concluded no safety concern at current intake levels without a numeric ADI.

Sources

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