CITRONELLYL PROPIONATE

CAS: 141-14-0 FLAVORING AGENT OR ADJUVANT

Citronellyl propionate is a synthetic flavouring agent permitted in foods under FDA regulation and evaluated by international expert committees.

What It Is

Citronellyl propionate is a synthetic flavouring agent or adjuvant used in food products to impart or modify flavour. It is a carboxylic ester derived from citronellol and propionic acid. In flavour chemistry, this compound contributes a fresh, fruity and floral note that can complement a range of fruit and citrus profiles. Citronellyl propionate is identified by the Chemical Abstracts Service Registry Number 141-14-0 and appears in regulatory contexts such as the United States Code of Federal Regulations where it is listed under synthetic flavouring substances and adjuvants. The chemical is often described in scientific and regulatory references as having a light rose-fruity odour and is used in combination with other flavouring agents to achieve specific sensory outcomes. The term "flavouring agent" refers to substances added to food to impart taste or aroma rather than nutritional value. Citronellyl propionate is not used for texture or preservation, but specifically to contribute desirable aroma and taste characteristics. It is chemically classified as an ester, which is a common class of flavour molecules in both natural and synthetic systems. Esters are responsible for many characteristic fruity and floral smells in foods and beverages. Because of its ester functional group and specific hydrocarbon chain, citronellyl propionate has distinct sensory properties compared to other esters used in flavouring. Other names for citronellyl propionate reflect its chemical structure, such as 3,7-dimethyl-6-octen-1-yl propanoate and citronellyl propanoate, which are used in different scientific and regulatory contexts. Understanding these synonyms helps professionals and regulators identify the compound accurately across databases and regulatory lists.

How It Is Made

Citronellyl propionate is manufactured through an esterification reaction between citronellol and propionic acid. In typical industrial settings, the alcohol (citronellol) is combined with propionic acid in the presence of a catalyst and heat to drive the formation of an ester bond, releasing water as a byproduct. This reaction can be conducted with azeotropic distillation or other techniques to remove water and drive the equilibrium toward ester formation. The result is a moderately stable ester with the desired flavour properties. After the esterification reaction, standard chemical processing steps include purification and quality control to ensure that the resulting product meets specifications for purity and sensory qualities. Depending on the intended use, the product may be purified further to meet food-grade or flavour-grade standards. Quality control tests might include odour evaluation, chromatographic purity analysis and checks for residual reactants. Because flavouring compounds are used at very low concentrations in food, achieving high purity helps ensure consistency in sensory performance without introducing unwanted off-notes. The manufacturing process for citronellyl propionate does not typically require highly specialized equipment beyond standard chemical synthesis infrastructure, but the reaction conditions and catalysts are selected to optimize yield and reduce side products. Reputable flavour manufacturers operate under stringent good manufacturing practices (GMP) and food safety standards to ensure that the compound produced is suitable for use in food and beverage formulations.

Why It Is Used In Food

The primary reason citronellyl propionate is used in food products is its capacity to enhance flavour profiles. Because it contributes fruity and floral notes, it is helpful in products where such sensory characteristics are desirable, such as fruit-flavoured beverages, confectionery, baked goods and dairy-based desserts. In many formulations, the sensory contribution of citronellyl propionate helps round out or brighten the overall flavour profile, especially when used with other complementary esters and aroma chemicals. Flavour chemists often combine multiple compounds to create complex and balanced flavour profiles. Citronellyl propionate can play a role in simulating or enhancing natural fruit flavours, contributing to a perception of freshness or floral complexity. Its use is typically at very low concentrations, sufficient to achieve the desired impact without overpowering the food matrix. Because flavour perception is sensitive to interactions between compounds, the specific functional role of citronellyl propionate may vary depending on the overall formulation. In addition to its sensory function, citronellyl propionate also acts as an adjuvant in some formulations, helping to modulate the release or perception of other flavour components. However, its use is always aligned with regulatory allowances and good manufacturing practices to ensure that concentrations remain within safe and accepted limits for consumption.

Adi Example Calculation

An illustrative example of how intake estimates might be considered involves a hypothetical adult consumer. Suppose a beverage contains a flavouring agent such as citronellyl propionate at a concentration of one part per million (1 mg per liter). If a person consumes one liter of that beverage per day, their intake of the flavouring compound from that source would be 1 mg per day. For a 70 kg adult body weight, this would correspond to approximately 0.014 mg per kg body weight per day. In regulatory assessments, such estimated exposures are compared with toxicological data and safety margins to characterize risk. In real-world regulatory evaluations, intake estimates account for the variety of food sources in which the compound may be used, as well as consumption patterns across populations. Expert committees often use conservative assumptions to ensure that even high-end consumers remain well below levels associated with toxicological concern. This hypothetical calculation illustrates how milligram-level use in foods translates into very low exposure relative to body weight, which is part of why many flavouring agents are evaluated as posing no safety concern at typical intake levels.

Safety And Health Research

Regulatory committees and expert panels review toxicological data when evaluating flavouring agents like citronellyl propionate. Toxicological studies, including oral and dermal toxicity assessments in laboratory animals, provide evidence on the biological response to the compound at various exposure levels. For citronellyl propionate, literature summaries indicate relatively high median lethal dose values in animal models, suggesting low acute toxicity. Such data contribute to regulatory risk assessments where the expected human exposure from flavour use is orders of magnitude lower than levels associated with toxicity in animals. In addition to acute toxicity, longer-term studies may examine subchronic or chronic exposure, genotoxicity and reproductive endpoints. When available data indicate that estimated human exposure from use in food does not approach levels of concern from toxicology studies, expert panels may conclude that there is no safety concern at current intake levels. In the case of citronellyl propionate, JECFA’s evaluation reflects such a position based on the available body of evidence and typical use patterns in food. Safety research in the context of flavouring agents balances potential hazard and estimated exposure. Because flavouring compounds are used at low ppm levels in foods, the exposure for most consumers is relatively low compared to doses studied in animal research. Expert committees integrate these data to provide risk characterizations that inform regulatory decisions and industry practices.

Regulatory Status Worldwide

In the United States, citronellyl propionate is listed among synthetic flavouring substances and adjuvants in Title 21 of the Code of Federal Regulations at section 172.515, which permits the use of specific synthetic flavouring agents in food when used in accordance with good manufacturing practice. This indicates regulatory acceptance for use in foods within defined limits and conditions as outlined in the regulation. Citations to this section of the CFR confirm that flavouring agents like citronellyl propionate are recognized within FDA’s regulatory framework for food additives. Internationally, citronellyl propionate has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA). According to the JECFA database entry, the compound was evaluated and determined not to raise safety concerns at current levels of intake when used as a flavouring agent. This type of evaluation reflects a risk assessment process considering available toxicological data and estimated exposure from use in foods. Because JECFA evaluations do not always assign numerical acceptable daily intakes when intake is considered low and not of safety concern, the regulatory context is focused on safety at customary use levels rather than establishing a strict numerical limit. While some regional authorities may have their own lists or evaluations, the recognised regulatory references for citronellyl propionate include FDA’s CFR listing and international expert committee evaluations. Absent explicit regional numeric limits in some jurisdictions, manufacturers rely on general principles of good manufacturing practice and documented safety evaluations to guide use concentrations.

Taste And Functional Properties

Citronellyl propionate is recognized for imparting a floral, fruity and slightly rosy aroma that can enhance fruit and citrus flavour profiles. These sensory qualities are due to its ester chemical structure, which interacts with olfactory receptors in ways that are often described as fresh and pleasant. The compound’s odour threshold and specific sensory profile make it useful in small quantities, since esters typically have potent aroma characteristics at low concentration. From a functional perspective, citronellyl propionate is more soluble in alcohol and fats than in water, which affects how it performs in different food matrices. In beverages with higher alcohol content or in emulsified systems, the compound may distribute differently compared to aqueous-based products. This solubility behaviour is typical of many flavour esters and is considered by flavourists when designing formulations to achieve the desired sensory impact. Stability is another functional consideration. Citronellyl propionate is reasonably stable under normal food processing conditions, though extreme heat or prolonged storage under adverse conditions may lead to gradual degradation or interactions with other ingredients. Because of its volatility and aroma strength, it is formulated to persist long enough for consumers to perceive its contribution without introducing off-notes. Flavour experts often assess heat and pH stability when selecting a flavouring agent for specific applications, ensuring that the compound retains its functional properties through manufacturing and shelf life.

Acceptable Daily Intake Explained

Acceptable daily intake (ADI) is a regulatory concept used to express the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. ADIs are typically derived by identifying the highest exposure level at which no adverse effects are observed in toxicological studies and applying safety factors to account for uncertainty between species and among human populations. For flavouring agents where exposure is very low and toxicology data indicate minimal risk at customary exposure levels, committees may conclude that typical intake does not raise safety concerns rather than assign a specific numeric ADI. In the case of citronellyl propionate, expert committee evaluations have indicated that there is no safety concern at current intake levels when used as a flavouring agent. This type of conclusion suggests that typical dietary exposure is well below any threshold of toxicological concern. When a numerical ADI is not established, regulatory frameworks rely on documented safety evaluations and principles of good manufacturing practice to guide use. Consumers and manufacturers benefit from understanding that regulatory acceptance is grounded in consideration of both hazard and exposure, rather than a simple numeric threshold alone. It is important to note that an ADI is not a recommended intake target but a safety benchmark used to inform regulatory decisions. For compounds evaluated as not of safety concern, the emphasis is on adherence to good manufacturing practice and documented usage levels that remain consistent with historical exposure patterns.

Comparison With Similar Additives

Citronellyl propionate can be compared with other ester flavouring agents such as ethyl butyrate and isoamyl acetate, which are also used to provide fruity and floral notes in foods. Ethyl butyrate is well known for its pineapple-like aroma and is widely used in fruit-flavoured products; like citronellyl propionate, it is an ester whose sensory profile is derived from its chemical structure. Both compounds contribute characteristic odours at low concentrations and are combined with other flavouring agents to craft balanced sensory experiences. Isoamyl acetate, another ester, is associated with banana-like notes and is commonly used in confectionery and beverage applications. While citronellyl propionate tends toward floral and citrus facets, isoamyl acetate emphasizes sweeter fruit impressions. These differences in sensory profiles illustrate how flavour chemists select specific esters to achieve targeted aroma outcomes. All such compounds are subject to regulatory evaluation and permissible use lists in various jurisdictions, with safety assessments grounded in both chemical properties and exposure estimates. Another compound, benzyl acetate, provides a sweet, floral-fruity aroma used in similar applications. Compared to citronellyl propionate, benzyl acetate has a distinct benzyl moiety contributing to its sensory characteristics. Understanding these similarities and differences helps formulators choose appropriate combinations of flavouring agents based on desired consumer perceptions.

Common Food Applications Narrative

Citronellyl propionate finds its way into a variety of food and beverage products where fruity and floral notes are desirable. In fruit-flavoured beverages, its fresh aromatic character can enhance citrus, berry and tropical profiles, contributing to an appealing sensory experience. Beverages that aim for a bright fruit aroma may incorporate such esters in carefully calibrated amounts to balance sweetness and acidity. Similarly, in confectionery items like hard candies and chewing gums, esters like citronellyl propionate help develop nuanced fruit impressions that complement sugar and other sweetening agents. In baked goods, flavour compounds must work within a complex matrix of heat, moisture and Maillard reaction products. Citronellyl propionate can add subtle aroma notes that persist through baking when formulated correctly. Pastries, cakes and sweet rolls with fruit components often benefit from such esters, which can extend perceived fruitiness without altering texture. Ice cream and frozen desserts also leverage ester flavouring agents to lift fruit or berry flavour profiles, where creamy and cold sensory attributes interact with volatile aroma compounds. Dairy-based desserts and yogurts with fruit swirl or compote inclusions are additional applications where citronellyl propionate may be used. The compound’s floral-fruity characteristics enhance the overall flavour complexity without overpowering the base dairy notes. In each of these applications, the emphasis is on achieving sensory harmony and consumer appeal, with careful formulation to maintain consistency and regulatory compliance.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA numeric approval status and ADI not confirmed from authoritative deep link

JECFA

  • Notes: JECFA evaluation did not include a numeric ADI on the sourced page
  • Adi Display: No safety concern at current levels of intake when used as a flavouring agent

Sources

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