ANISYL BUTYRATE

CAS: 6963-56-0 FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

Anisyl butyrate is a synthetic ester used as a flavoring agent in foods. It is listed among synthetic flavoring substances in regulatory inventories and has been evaluated by international expert committees for use as a flavoring substance.

What It Is

Anisyl butyrate is an ester compound characterized by the chemical structure of a butyrate group esterified to a substituted benzyl alcohol. It is commonly recognized in the flavor and fragrance industry as a synthetic flavoring agent, with a scent profile often described as sweet, floral, and reminiscent of vanilla-like or fruity notes. The compound is identified by the Chemical Abstracts Service (CAS) number 6963-56-0, which serves as a unique identifier for regulatory and chemical inventory purposes. Other synonyms and alternative names encompass a range of nomenclatures reflecting different naming conventions for the same chemical structure, including methoxybenzyl butyrate and variations indicating its constituent moieties. In the context of food science and formulation, anisyl butyrate functions as a flavor enhancer, providing specific aromatic qualities that enhance or modify the sensory experience of food products. It is part of the broader category of flavoring agents and adjuvants that are used in very small amounts to achieve the desired taste and aroma in a variety of food applications. As a specialized additive, anisyl butyrate is typically used in accordance with good manufacturing practices such that the quantity added to food does not exceed the minimum required to achieve its technical effect. This compound’s technical classification encompasses both flavor enhancement and functional roles in flavor formulations. It is not a nutrient, preservative, or direct contributor to the nutritional content of food. Instead, it plays a role in sensory perception, working synergistically with other flavoring substances to deliver complex and appealing taste profiles in finished food products.

How It Is Made

Anisyl butyrate is synthesized industrially through chemical esterification, a reaction between anisyl alcohol (also known as p‑methoxybenzyl alcohol) and butyric acid. Under controlled conditions, these reactants combine in the presence of an acid catalyst to form the ester linkage characteristic of anisyl butyrate, with water released as a byproduct of the reaction. Industrial processes often optimize reaction conditions, including temperature and reactant ratios, to favor high conversion and yield while minimizing side products. The chemistry underlying the production of anisyl butyrate is representative of general ester synthesis techniques used across the flavor and fragrance industry. After the initial esterification reaction, the crude product is typically subjected to purification processes such as distillation or solvent extraction to remove unreacted starting materials and catalysts. The purified ester may then be further refined to meet specific purity criteria required for food‑grade or flavor‑grade applications. These specifications are critical to ensure consistency in sensory performance and to comply with regulatory expectations for food additives. Manufacturers producing anisyl butyrate for commercial use must adhere to stringent quality controls throughout the production and packaging cycle. These controls address aspects such as raw material sourcing, reaction monitoring, purification efficacy, and final product storage. Because flavoring agents like anisyl butyrate are added in very small amounts during formulation, even minor impurities can influence the final flavor profile or introduce off‑notes. Proper manufacturing practices and quality assurance protocols therefore play a significant role in delivering a reliable and consistent ingredient to food formulators. From a regulatory perspective, production of flavoring agents including anisyl butyrate must also align with food safety standards that govern manufacturing facilities and processes. These standards encompass not only chemical purity but also conditions related to contamination control, traceability, and documentation, ensuring that the finished additive meets the intended safety and quality benchmarks for its approved uses.

Why It Is Used In Food

Anisyl butyrate is used in food primarily as a flavoring agent to impart or enhance specific sensory characteristics. Its chemical structure confers a distinct aromatic profile that can contribute sweet, floral, and fruity notes to a variety of formulations. Flavor chemists and food scientists leverage such compounds to build complex flavor compositions that appeal to consumer preferences when tasting products such as ice cream, candies, baked goods, and beverages. In practice, anisyl butyrate is included in formulations at very low concentrations, sufficient to achieve its intended flavor effect without altering other desirable properties of the food. Its utility is especially evident in products where subtle enhancements to vanilla, fruit, or floral nuances are sought. For example, flavor developers may combine anisyl butyrate with other esters, aldehydes, or aromatic compounds to achieve a balanced and nuanced finished flavor that tastes natural or reminiscent of specific foods. The use of such flavoring agents allows manufacturers to achieve consistency in taste across production batches, an important consideration given the natural variability of raw ingredients. Flavorings like anisyl butyrate also enable cost‑effective formulation, as they can substitute for or augment natural extracts or ingredients that may be more expensive, less stable, or subject to agricultural variability. This helps maintain product quality while managing production costs. From a formulation standpoint, anisyl butyrate’s stability under typical processing conditions, such as heating or mixing, means that it can retain its sensory contribution through manufacturing steps that involve elevated temperatures or extended shelf life. However, the specific stability characteristics of any flavoring agent depend on its chemical nature and the food matrix in which it is used. Food scientists evaluate these aspects carefully to ensure that the desired flavor impact persists throughout the product’s intended shelf life and consumption conditions.

Adi Example Calculation

To illustrate the concept of exposure relative to an Acceptable Daily Intake (ADI), consider a hypothetical scenario where a flavoring agent has an established ADI of X mg per kg body weight per day. If a person weighs 70 kg, multiplying the ADI by body weight gives the total amount considered acceptable per day: 70 kg times X mg/kg equals 70X mg per day. If that person’s estimated daily intake of the flavoring agent from food products is substantially below this value, exposure is within the acceptable range. For anisyl butyrate, regulatory evaluations have concluded that its use at levels customary in food formulations does not raise safety concerns. In such cases, the ADI is conceptual: typical intake from food products is expected to be much lower than levels associated with toxicological effects in studies. Whether or not a specific numeric ADI has been assigned, this framework helps food scientists and regulators understand how intake compares with safety benchmarks. It is important to emphasize that this example is illustrative. Consumers do not need to calculate their intake of individual flavoring agents. Rather, regulatory bodies perform exposure assessments that consider consumption patterns across populations to ensure that the combined intake of flavoring substances remains within safe boundaries.

Safety And Health Research

Regulatory authorities and expert scientific committees assess food additives such as anisyl butyrate through data that examine toxicological endpoints, metabolism, and exposure. At typical levels of use in food flavoring, anisyl butyrate has been evaluated by expert panels that consider available animal toxicity studies, chemical properties, and exposure estimates to reach conclusions about safety. In one evaluation, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed available information and concluded that there was no safety concern at current levels of intake when used as a flavoring agent, reflecting a risk assessment perspective that takes into account both hazard and typical exposure scenarios. Toxicological assessments for flavoring agents generally include studies on acute toxicity, subchronic and chronic effects, and metabolic pathways. For anisyl butyrate, available animal studies reported acute toxicity values such as oral LD50 in rats and dermal LD50 in rabbits, which provide context for the compound’s relative toxicity in high‑dose testing environments. Such data help regulators compare a substance’s hazard profile against expected human exposure levels under intended use conditions. In this case, the acute toxicity data suggest a relatively low acute hazard. Metabolic considerations are also part of safety evaluation. Esters like anisyl butyrate are typically metabolized by enzymes that hydrolyze the ester bond, producing constituent alcohols and acids that enter general metabolic pathways. This metabolic behavior influences how the body processes and eliminates these compounds after ingestion. When such metabolic pathways are well understood and do not generate toxic intermediates at relevant exposure levels, they support safety assessments that align with dietary exposure from flavoring use. Overall, the body of research and regulatory assessment indicates that anisyl butyrate’s use as a flavoring agent under conditions of good manufacturing practice does not raise identified safety concerns. However, continued monitoring and evaluation of new data on any food additive remain components of ongoing regulatory science.

Regulatory Status Worldwide

Anisyl butyrate’s regulatory status varies by jurisdiction but is recognized in major food chemical regulations as a permissible flavoring substance when used in accordance with specified conditions. In the United States, synthetic flavoring substances and adjuvants including anisyl butyrate are listed in Title 21 of the Code of Federal Regulations, Part 172, Section 172.515, which outlines synthetic flavoring substances and adjuvants permitted for direct addition to food. This regulatory listing signifies that the compound may be used safely in food formulations at levels necessary to achieve its intended flavoring effect, provided it is employed in good manufacturing practice consistent with regulatory expectations. The regulation does not specify quantitative limits but emphasizes that usage should be the minimum required to achieve the desired effect. This regulatory text is authoritative and reflects current U.S. food additive permissions as codified by the Food and Drug Administration. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated anisyl butyrate as part of its assessments of flavoring agents. In a JECFA evaluation summary, the committee reviewed the available toxicological information and concluded that there was no safety concern at current levels of intake for anisyl butyrate when used as a flavoring agent. While the evaluation did not establish a formal Acceptable Daily Intake (ADI) numerical value, the determination reflects an expert consensus that exposure from typical flavoring use does not pose a safety risk under current conditions. Different jurisdictions may also include this compound in inventories of permitted flavorings or GRAS (Generally Recognized as Safe) lists maintained by national or regional regulatory bodies. The European Union’s flavoring regulations and other national frameworks similarly categorize anisyl butyrate and related esters according to functional class and permitted use, with regulatory requirements focusing on purity, labeling, and compliance with general food safety principles. These regulatory frameworks operate on principles that ensure flavoring agents are used within established safety paradigms and that food manufacturers maintain documentation demonstrating compliance.

Taste And Functional Properties

Anisyl butyrate exhibits sensory properties that are leveraged in food flavoring due to its characteristic aromatic profile. Sensory descriptions often highlight sweet, floral, and fruity notes, with nuances that can resemble vanilla or plum‑like impressions. Such olfactory and taste characteristics make it a valuable component in flavor blends designed for products targeting specific sensory experiences, including desserts, confections, and fruit‑based flavors. Functionally, anisyl butyrate belongs to the class of volatile esters that are prized in flavor science for their ability to influence both aroma and perceived taste. These compounds readily vaporize at room temperature, interacting with olfactory receptors to contribute to overall flavor perception. Flavor perception is a holistic experience combining taste and smell; hence the olfactory contributions of anisyl butyrate are central to its functional role. The solubility and stability of anisyl butyrate are also important functional considerations. Typically, esters such as anisyl butyrate are soluble in organic phases and soluble to a limited extent in aqueous systems, particularly when other solubilizing components are present. This influences how they are incorporated into different food matrices. For example, in oil‑rich or emulsion‑based products, their solubility facilitates uniform distribution of flavor. In predominantly aqueous foods, skilled formulation and the presence of solubilizers or emulsifiers aid even dispersion. Thermal stability is another functional property relevant to processing conditions. Although specific stability data are not universally published, in practice, flavor chemists assess how such compounds behave under typical cooking or processing temperatures. The goal is to maintain flavor integrity without significant degradation during manufacturing or storage. Because flavorings are used at low levels, even modest losses due to heat can alter the sensory outcome, so understanding these functional properties helps in designing robust formulations.

Acceptable Daily Intake Explained

The concept of an Acceptable Daily Intake (ADI) is a risk assessment tool used by food safety regulators to describe the amount of a substance that can be ingested daily over a lifetime without appreciable health risk. It is expressed in milligrams of the substance per kilogram of body weight per day. The ADI is typically derived from toxicological studies, where a no‑observed‑adverse‑effect level (NOAEL) is identified and then divided by safety factors to account for uncertainties between animal studies and human exposure. For anisyl butyrate specifically, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed the available data and concluded that there was no safety concern at current intake levels for its use as a flavoring agent. In such evaluations, when typical dietary exposures are far below levels associated with adverse effects in animal studies, regulators may determine that setting a numerical ADI is not necessary. Instead, they rely on the conclusion that current use under good manufacturing practice does not pose a safety concern. This approach ensures that the compound’s inclusion in food at customary levels is not expected to result in harmful exposure. Importantly, the ADI is not a recommended intake level for consumers, nor is it intended to suggest that higher intake is beneficial. Rather, it is a conservative threshold that incorporates uncertainty factors to protect public health. In regulatory practice, flavoring agents like anisyl butyrate are used in very low concentrations, and exposure estimates based on consumption patterns typically fall well below levels of toxicological concern. This alignment between exposure and safety assessments underpins regulatory decisions regarding permissible use.

Comparison With Similar Additives

Anisyl butyrate shares functional similarities with other ester‑type flavoring agents used in the food industry. Examples include ethyl butyrate and methyl anthranilate, both of which also contribute fruity or floral aromatic notes when used in flavor formulations. Ethyl butyrate is known for its strong fruity aroma, often associated with pineapple or orange notes, and is commonly used in beverage and confectionery applications. Compared with ethyl butyrate, anisyl butyrate’s profile tends toward more floral and vanilla‑like impressions, which can complement other flavor notes in complex blends. Methyl anthranilate, another aromatic ester, delivers grape‑like or fruity nuances that are distinct from the scent provided by anisyl butyrate. While methyl anthranilate is often used in fruit flavor formulations, anisyl butyrate’s contribution may be chosen when a more subtle or rounded floral character is desired. In both cases, these compounds operate within the broader category of esters that enhance or modify sensory perceptions in food. Another related additive is benzyl acetate, which also provides floral and sweet notes, particularly in products where a delicate aroma is needed. Compared with anisyl butyrate, benzyl acetate’s odor profile may be perceived as lighter or differently balanced, illustrating how specific structural differences among esters influence sensory outcomes. Formulators often select flavoring agents based on their individual sensory properties and how they interact with other components in a blend. Understanding these comparative characteristics helps flavor chemists tailor product profiles that meet consumer expectations for taste and aroma.

Common Food Applications Narrative

In the realm of food manufacturing, anisyl butyrate finds application in a range of products where enhanced flavor profiles are desirable. Its sweet and floral aromatic characteristics make it suitable for inclusion in confections, frozen desserts, baked goods, and beverage flavor systems. These applications capitalize on the compound’s ability to contribute nuanced sensory properties that augment the overall taste experience. In candy and confectionery, flavor complexity is central to consumer satisfaction. Anisyl butyrate contributes to sweet and fruity undertones that can complement sugar profiles and other flavor ingredients. Confectionery products often contain multiple flavor compounds blended to evoke fruit, spice, or dessert impressions. In this context, anisyl butyrate helps round out and elevate specific sensory notes within a balanced flavor composition. Frozen desserts such as ice cream and sorbet also benefit from flavor enhancers that can withstand cold temperatures while delivering vibrant taste attributes. As manufacturers seek to differentiate products within crowded marketplaces, the strategic use of carefully selected flavoring agents like anisyl butyrate can help create memorable and desirable flavor experiences. Baked goods, including cookies, pastries, and cakes, are other common applications. During baking, the interplay between heat and flavor compounds influences the final aromatic bouquet of the finished product. Flavor agents that contribute subtle fruit or vanilla‑like notes can enrich the sensory profile that consumers associate with freshness and quality. Anisyl butyrate’s contribution to such profiles supports the development of distinctive baked product flavors. Beverages, particularly flavored drinks or mixers, also incorporate flavoring agents to achieve targeted sensory characteristics. Whether providing fruity accents or rounding out overall taste impressions, flavor enhancers play a part in broadening the appeal and sensory richness of ready‑to‑drink and concentrate formulations. In all these applications, careful formulation ensures that the additive is used at levels appropriate to achieve the intended effect without overpowering other elements of the product’s flavor.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: Specific EFSA evaluation not found in available authoritative sources.

JECFA

  • Notes: JECFA concluded no safety concern at current intake levels; no numerical ADI found in the d evaluation.

Sources

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