BENZYL LEVULINATE

CAS: 6939-75-9 FLAVORING AGENT OR ADJUVANT

Benzyl levulinate (CAS 6939-75-9) is a synthetic flavoring agent or adjuvant used to impart fruity notes in formulations and is recognized in flavor industry inventories.

What It Is

Benzyl levulinate is a synthetic chemical compound identified by CAS number 6939-75-9 that belongs to a class of esters used in flavoring applications in food and beverage formulations. It is recognized in flavor industry reference libraries and inventories as a flavoring agent with a characteristic fruity profile that contributes to certain flavor blends. The compound is catalogued with identifiers such as FEMA number 4623 and JECFA number 2064 in flavor databases that document compounds evaluated for use in flavor applications, although those listings reflect industry assessment rather than explicit regulatory approvals by jurisdictions. Benzyl levulinate appears in listings such as the FDA Substances Added to Food inventory, which compiles flavoring substances associated with expert panel evaluations and historic use information rather than specific food additive regulations. In its pure form, benzyl levulinate is described as a clear viscous liquid to waxy solid with fruity organoleptic properties as documented in flavor industry sources. The structure of benzyl levulinate is the benzyl ester of levulinic acid, which is a simple aliphatic keto acid. As an ester, it combines the benzyl alcohol moiety with the levulinic acid backbone, yielding a molecular structure with both aromatic and aliphatic character. Flavor industry references highlight its use in fruit, citrus, and other flavor constructs to impart nuanced notes, often in conjunction with other flavoring ingredients. The compound’s presence in flavor evaluation databases signifies that it has been considered in the context of flavor creation and expert panel assessment, but inclusion in such inventories does not equate to direct codified regulatory authorization in food additive regulations in jurisdictions like the United States or the European Union. Benzyl levulinate’s characterization as a flavoring agent or adjuvant reflects its technical role in modifying sensory profiles of foods and beverages. Flavoring agents are substances that contribute aroma or taste and are used at low levels in formulations to achieve the desired sensory outcome. Adjuvants associated with flavoring agents can enhance the intensity or stability of flavor impressions. The designation as a flavoring agent or adjuvant underscores the compound’s role in formulation science rather than nutritional contribution or preservative function. Industry use and documentation focus on flavor creation contexts, highlighting typical sensory attributes and formulation considerations.

How It Is Made

The synthesis of benzyl levulinate typically involves an esterification reaction between levulinic acid and benzyl alcohol under controlled conditions. Levulinic acid, a keto acid derived from biomass processing or chemical synthesis, reacts with benzyl alcohol in the presence of an acid catalyst to form the ester linkage characteristic of benzyl levulinate. This type of organic synthesis is a common method for producing esters, where the carboxylic acid group of levulinic acid and the hydroxyl group of benzyl alcohol combine to form the ester and water as a byproduct. Chemical suppliers document this synthetic pathway as part of the product’s manufacturing background, although specific industrial process details are proprietary to individual producers. Commercial production of benzyl levulinate for use in flavor applications adheres to quality standards relevant to the intended market, with purity and impurity profiles determined by analytical characterization. The compound is typically isolated and purified after synthesis to achieve an assay specification appropriate for flavor industry use, which may be indicated in supplier catalogs. While the compound is available from chemical suppliers with certified purity ranges, specific food-grade specifications are not universally codified in official monographs like Food Chemicals Codex due to the specialized nature of flavoring agents and the role of industry expert panels in flavor evaluation. The production environment for benzyl levulinate and similar esters is designed to meet safety and handling standards appropriate for chemical manufacturing. Depending on jurisdiction and end use, producers may follow Good Manufacturing Practice (GMP) guidelines relevant to flavoring ingredients, ensuring consistent quality and minimization of residual reagents. Synthesis of such flavoring esters often includes steps to control reaction temperature, catalyst usage, and byproduct removal to ensure the final ester meets technical requirements for its sensory role. Quality assurance protocols such as chromatographic analysis aid in confirming composition and impurity levels. Although benzyl levulinate is recognized in flavor industry listings, regulatory oversight of manufacturing for specific food use labels varies by region and depends on local food additive approval frameworks.

Why It Is Used In Food

Benzyl levulinate is used in flavor applications to contribute fruity aromatic characteristics and to enhance the complexity of flavor profiles in food and beverage products. In formulation science, flavoring agents like benzyl levulinate are selected based on their sensory impact, volatility, and compatibility with other ingredients to achieve a desired taste and aroma perception by consumers. Esters, in particular, are known for imparting fruity notes, and benzyl levulinate’s unique sensory attributes make it suitable in blend designs aimed at replicating natural fruit nuances or complementing other flavor notes. Flavor creation in food and beverage products involves balancing multiple compounds to achieve a harmonious sensory experience. Benzyl levulinate can act as a key note or supporting note depending on the overall flavor architecture. Its selection in formulations is often based on sensory evaluation panels and flavorist expertise that consider how the compound interacts with base ingredients, sweeteners, acids, and other flavor components. The compound’s chemical structure lends itself to contributing subtle nuances in aroma that can elevate flavor complexity without overpowering dominant notes. Typical contexts for including benzyl levulinate in flavoring formulations span categories where fruity or aromatic profiles are desirable, such as certain confectionery elements, beverages, and fruit-flavored products. The use decision is guided by sensory impact, consumer preference trends, and regulatory context surrounding allowable flavoring agents in specific markets. Flavor chemists evaluate such compounds for their odor threshold, stability during processing, and persistence in finished products. Benzyl levulinate’s fruity characteristics, coupled with its functional behavior as an ester, make it a candidate for inclusion in bespoke flavor blends designed to enhance product appeal.

Adi Example Calculation

Illustrative example for understanding an acceptable daily intake (ADI): If an ADI of 1 mg per kg of body weight per day were assigned to a hypothetical flavoring agent (this is an illustrative number and not specific to benzyl levulinate due to lack of numeric ADI in d sources), a person weighing 70 kg would have an ADI of 70 mg per day. This hypothetical value represents the amount of the substance that could be ingested daily over a lifetime without expected health concerns based on studied toxicological data and safety factors. It is important to emphasize that this example is illustrative and not a reflection of an actual regulatory ADI for benzyl levulinate. Without explicit numeric ADI values confirmed in deep-link regulatory sources, the calculation serves to demonstrate how ADI numbers are used rather than to provide specific guidance for this ingredient. Actual ADI values, when established, are published by expert committees or regulatory agencies and are based on detailed toxicological data. The illustration helps readers understand the purpose of an ADI and how body weight factors into exposure assessment. ADIs assist risk assessors and industry professionals in estimating safe exposure levels relative to consumer consumption patterns, with safety factors incorporated to account for uncertainties in the underlying data.

Safety And Health Research

Safety evaluations for flavoring agents like benzyl levulinate typically involve assessment by expert panels that review available toxicological data, structural class considerations, and estimated intake levels based on typical use in flavorings. Expert panel literature identifies benzyl levulinate within structural class assessments for flavoring agents, which consider metabolic pathways, potential for toxicity, and existing data for related compounds. These assessments inform whether a substance is considered appropriate for use as a flavoring agent in food applications in line with industry practices. Published flavor industry evaluations indicate that benzyl levulinate has been subject to review in flavor evaluation contexts, with documented FEMA references and associated JECFA listings. Such evaluations generally account for structural and metabolic considerations that suggest low concern at typical use levels, but the specifics of any hazard data or formal acceptable intake thresholds would be detailed in comprehensive toxicological monographs produced by committees such as the Joint FAO/WHO Expert Committee on Food Additives. In the absence of direct numeric health guidance from regulatory authorities or explicit numerical acceptable daily intake values in the d sources, safety consideration narratives emphasize that use is guided by industry expert assessment rather than quantified regulatory limits. Regulators and expert committees consider endpoints such as genotoxicity, subchronic toxicity, and metabolic fate when assessing flavoring agents, with data requirements tailored to the compound in question. For benzyl levulinate, structural similarity to other ester flavoring agents informs expert judgement on safety, considering expected metabolic pathways in humans and animals. Without direct evidence of adverse effects at typical use levels, and without documented numeric regulatory thresholds in accessible deep links, safety narratives focus on the context of expert evaluation and the use of such compounds within established flavoring practice rather than definitive health outcome statements. Industry and scientific literature emphasize a cautious, evidence-based approach to evaluating flavoring agents such as benzyl levulinate.

Regulatory Status Worldwide

Benzyl levulinate appears in flavor industry inventories and expert panel listings such as the FDA Substances Added to Food inventory and FEMA flavor library, which document CAS 6939-75-9 as a flavoring agent with associated identifiers like FEMA number 4623 and JECFA number 2064, but inclusion in these resources does not equate to explicit food additive approval codified under specific regulations. The FDA’s Substances Added to Food inventory provides a reference for flavoring substances historically evaluated by expert panels; however, it also includes a note that such inclusion is not itself an FDA approval, and substances may be subject to good manufacturing practice conditions rather than specific regulatory listings in the Code of Federal Regulations. Therefore, while benzyl levulinate is recognized in flavor databases, formal approval status within 21 CFR Parts may not be explicitly defined. In the United States, synthetic flavoring agents can be used under the general provision that they are employed in accordance with good manufacturing practice and serve a flavoring purpose, as outlined in CFR sections governing synthetic flavoring substances. Benzyl levulinate’s listing in an FDA flavoring inventory reflects its technical classification but does not substitute for a distinct regulation section permitting its direct addition to foods with specified conditions. In other jurisdictions, regulatory frameworks for flavorings often rely on positive lists or expert panel assessments that inform allowable use categories, with industry and Codex Alimentarius guidance assisting in harmonizing approaches. At the international level, compounds with JECFA numbers are documented in specifications and evaluations prepared by the Joint FAO/WHO Expert Committee on Food Additives, which assesses flavoring agents and provides summaries of evaluations in food additives series publications. Benzyl levulinate’s presence in such listings signals that it has been considered in scientific evaluation contexts, but specific numeric acceptable daily intake values or international numeric authorizations are not readily available without direct examination of JECFA specifications. As such, regulatory status worldwide is guided more by expert assessment listings and industry acceptance rather than explicit numeric authorizations defined in regulation documents.

Taste And Functional Properties

Benzyl levulinate is characterized by flavor industry sources as having a fruity sensory profile that contributes aromatic complexity in flavor formulations. As an ester, the compound exhibits properties common to many flavor esters, including volatility that enables aroma release at low concentrations and solubility characteristics that influence its behavior in different matrices. Esters like benzyl levulinate generally demonstrate greater solubility in ethanol and lipid phases and limited solubility in pure water, affecting how they distribute in complex food systems and release sensory cues during consumption. In sensory evaluation contexts, benzyl levulinate’s odor profile is noted for fruity and aromatic notes that can complement other flavoring components. The functional properties of such esters in flavor systems include their ability to enhance or modify perception of fruitiness, adding depth or accentuating specific aromatic facets. When formulating with benzyl levulinate, flavorists consider not only the sensory contribution but also the compound’s stability during processing conditions such as heat and pH changes. Esters can undergo hydrolysis or degradation under extreme conditions, so understanding their stability profile assists in predicting performance in various food applications. The behavior of benzyl levulinate in formulation is influenced by its physicochemical properties. Its moderate logP value reflects a balance between hydrophilic and lipophilic tendencies, affecting how it partitions between phases in emulsions or solutions. Functional considerations include how the compound interacts with other flavor molecules, sweeteners, acids, and carriers to achieve coherent sensory outcomes. While benzyl levulinate is appreciated for its aromatic qualities, its effective use requires careful calibration of concentration to align with sensory goals, ensuring that it enhances desired notes without introducing off-notes or sensory imbalance.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a concept used by regulatory and expert bodies to estimate the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, based on available toxicological data and application of safety factors. ADIs are expressed in milligrams of substance per kilogram of body weight per day and are determined from studies on toxicity, metabolism, and potential effects at varying doses. In the case of flavoring agents such as benzyl levulinate, an ADI would be established by expert committees like JECFA if sufficient data were available and evaluated systematically to define a numerical threshold. For benzyl levulinate, specific numeric ADI values are not readily available in the d sources, and formal ADI designations are not confirmed in the referenced databases. Therefore, general descriptions of the ADI concept provide context for how regulators and expert panels frame safety assessments for flavoring agents. ADIs are inherently conservative, incorporating uncertainty factors to account for differences between study animals and humans and variability among individuals. The purpose of an ADI is not to recommend daily consumption but to set a boundary below which exposure is not expected to pose health concerns, based on the totality of evidence. When numeric ADI values are established for substances, they are published in regulatory documents or expert committee monographs, providing clear guidance for industry and risk assessors. In the absence of such explicit numeric values for benzyl levulinate in the accessible regulatory literature, the concept of ADI helps readers understand how safety considerations are framed for flavoring agents and why numeric thresholds are important for regulatory decision-making.

Comparison With Similar Additives

Benzyl levulinate shares functional similarities with other ester-based flavoring agents used to impart fruity or aromatic notes in food and beverage formulations. Esters such as ethyl butyrate, isoamyl acetate, and benzyl acetate are commonly employed in flavor design for their characteristic fruit-like sensory profiles. Ethyl butyrate is often associated with pineapple and citrus notes, while isoamyl acetate contributes banana-like aroma, and benzyl acetate has a sweet, floral scent. These compounds, like benzyl levulinate, are selected for their aroma contributions and are evaluated in flavorist practice for how they influence overall sensory outcomes. In formulation contexts, the selection among these esters depends on the sensory goals of the product. Benzyl levulinate’s fruity profile may be used to complement or modify specific components of a flavor blend, whereas ethyl butyrate’s sharp, tropical notes are suited to other flavor targets. The comparative functional behavior underscores how similar additives contribute distinct sensory nuances, with flavor chemists considering volatility, odor threshold, and compatibility with other ingredients when designing blends. While structurally similar ester flavoring agents are often documented in flavor inventories and expert panel listings, their regulatory status and numeric safety thresholds vary depending on available data and evaluations by committees such as JECFA or expert panels. When comparing benzyl levulinate with other esters, it is important to consider not only their sensory attributes but also their documented evaluation history and regulatory context as recognized in industry and scientific literature.

Common Food Applications Narrative

Benzyl levulinate is incorporated as a component in flavoring blends for a range of food and beverage applications where fruity and aromatic notes are sought. In confectionery products, the compound can contribute to fruit-associated flavor profiles that enhance consumer perception of sweetness and freshness. Its inclusion in beverage formulations, particularly those featuring fruit-derived or fruit-inspired flavors, underscores its utility in achieving a layered aromatic experience that resonates with target sensory expectations. In culinary applications such as baked goods or dessert products, benzyl levulinate may be used by flavorists to enrich the overall flavor palette, supporting primary fruit notes or adding depth to complex formulations. The compound’s aromatic contribution can be particularly valuable in products that combine multiple flavor elements, such as fruit fillings with creamy or citrus components, where nuanced interplay among compounds enhances consumer appeal. Flavor scientists evaluate the specific roles that benzyl levulinate plays within these systems to optimize impact without overshadowing key characteristics of the intended flavor profile. Although benzyl levulinate’s use is more specialized compared to common food ingredients like sugars or acids, it represents an example of how targeted flavoring compounds are integrated into formulations to meet sensory goals. In beverage applications, especially those that aim to deliver an authentic fruit-like aroma, benzyl levulinate can act alongside other esters and aromatic compounds to build complexity and balance. Its presence in flavor libraries and expert panel inventories reflects its recognized contributions within the flavor development community. Careful consideration of concentration and interaction effects ensures that benzyl levulinate supports the desired sensory narrative in finished foods and beverages.

Safety & Regulations

FDA

  • Notes: Inclusion in FDA flavor substance inventories does not constitute a specific regulatory approval section under CFR.

EFSA

  • Notes: No EFSA numeric ADI or E number identified in available sources.

JECFA

  • Notes: JECFA listing exists but specific numeric ADI and year not found in accessible deep links.

Sources

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