ALPHA-ETHYL BENZYL BUTYRATE

CAS: 10031-86-4 FLAVORING AGENT OR ADJUVANT

Alpha-Ethyl Benzyl Butyrate (CAS 10031-86-4) is a synthetic ester used as a flavoring agent or adjuvant with a sweet, floral-fruity aroma profile and is regulated for use in foods such as flavors under US CFR 172.515.

What It Is

Alpha-Ethyl Benzyl Butyrate is a chemically defined flavoring substance belonging to the class of synthetic esters used to impart sweet and floral-fruity odor and taste characteristics in food products. It is identified by the Chemical Abstracts Service (CAS) number 10031-86-4 and has multiple synonyms including 1-phenylpropyl butyrate and ethyl phenyl carbinyl butyrate, among others, which are recognized in flavor industry inventories and regulatory listings. As a technical function, it is classified broadly as a flavoring agent or adjuvant, contributing minor yet distinct sensory attributes to complex flavor formulations such as fruit blends. Its structure consists of a butyrate ester of a substituted phenylpropyl alcohol, a formulation that yields a characteristically sweet, floral aroma reminiscent of jasmine, apricot and plum when used at trace levels in flavors. The inclusion of this additive in flavor libraries such as FEMA and the FDA’s Food Substances Added to Food inventory indicates its recognized role in food flavoring under regulated conditions. Flavoring agents like Alpha-Ethyl Benzyl Butyrate are used for their organoleptic contributions rather than nutritional value, and its presence in ingredient inventories reflects evaluation by expert panels and regulatory authorities on both sides of the Atlantic. Consumer-facing products may contain such substances at concentrations where they contribute sensory complexity without dominating the flavor profile. The scientific identity and regulatory status of Alpha-Ethyl Benzyl Butyrate are maintained through standardized nomenclature and registry numbers that permit consistent reference across industry, regulatory documentation, and safety evaluations.

How It Is Made

Synthetic flavoring substances such as Alpha-Ethyl Benzyl Butyrate are typically produced by esterification of the appropriate alcohol and acid precursors under controlled conditions, resulting in a high-purity ester suitable for use in flavor formulations. In broad terms, esterification involves reacting an alcohol — in this case a substituted phenylpropanol — with butyric acid or a butyric acid derivative in the presence of a catalyst, followed by purification steps such as distillation or chromatography to achieve the required purity levels for food-grade applications. The processes used to manufacture flavoring esters are designed to comply with good manufacturing practice (GMP) standards and food safety regulations, ensuring that the final product meets stringent specifications for identity and quality before distribution to the flavor industry. Industry compendia like the FEMA Flavor Ingredient Library provide detailed profiles that include safety assessments, use levels and analytical specifications for such substances, reflecting accumulated data from scientific literature and regulatory evaluations. Manufacturers of flavoring agents will also implement internal controls and quality assurance testing to verify identity, composition and absence of undesirable impurities. While specific proprietary methods and catalysts may vary among producers, the underlying principle revolves around well-characterized chemical reactions and purification techniques to deliver a stable, food-grade compound that performs as expected in flavor blends.

Why It Is Used In Food

Alpha-Ethyl Benzyl Butyrate is used in food primarily for its ability to impart and enhance sweet and fruity aromatic qualities that complement other flavor components in a wide range of formulations. Flavor chemists often select such esters to contribute specific sensory nuances that are otherwise difficult to achieve using natural ingredients alone, particularly when formulating complex fruit and floral profiles in beverages, confections, baked goods and dairy products. Its inclusion in a flavor blend can heighten perceived sweetness and round out the overall aroma without adding calories or substantive bulk to the product. By functioning as a flavoring agent or adjuvant, Alpha-Ethyl Benzyl Butyrate enhances specific organoleptic characteristics that are key to consumer acceptance and enjoyment of many processed foods. Its compatibility with other flavoring ingredients, including both natural extracts and synthetic compounds, allows formulators to fine-tune taste experiences across product categories. Regulatory listings such as those in the FDA’s flavoring substances inventory provide a framework for its safe use within defined good manufacturing practices, contributing to predictable and reproducible sensory outcomes.

Adi Example Calculation

To illustrate how an ADI concept might be applied without asserting specific numeric values for Alpha-Ethyl Benzyl Butyrate, consider a hypothetical scenario where a flavoring compound with an established ADI of X mg per kg body weight per day is consumed by a 70 kg adult. Under this scenario, the adult’s daily intake of that compound would be compared with the ADI threshold by multiplying the ADI by the individual’s body weight. If actual intake from all food sources remains below this product (X times 70), the exposure would be considered within the safety margin defined by the ADI. This type of calculation is illustrative and should not be interpreted as specific dietary advice or applied to Alpha-Ethyl Benzyl Butyrate without a verified numeric ADI from authoritative sources. Such illustrative calculations highlight the concept that regulatory benchmarks are set with conservative safety factors and are intended to guide risk assessments rather than dictate precise intake values for individuals.

Safety And Health Research

Regulatory and scientific evaluations of Alpha-Ethyl Benzyl Butyrate have focused on its safety as a flavoring agent at levels associated with intended use in foods. For example, expert panels such as those convened by JECFA have reviewed this compound in the context of broader flavoring group assessments, considering available toxicological data and intake estimates to determine whether safety concerns arise at current exposure levels. These reviews have concluded that use of this substance as a flavoring agent does not raise safety concerns under typical conditions of use. Safety assessments generally consider factors such as potential genotoxicity, subacute and subchronic toxicity as well as metabolic fate, applying standard risk assessment principles to evaluate whether consumer exposure is within acceptable thresholds. Panel evaluations often rely on structural and metabolic analogies with related compounds when direct data are limited, a common practice in flavoring safety science. The overarching conclusion from such assessments is that Alpha-Ethyl Benzyl Butyrate fits within established frameworks for safe use in food flavoring when good manufacturing practices are followed.

Regulatory Status Worldwide

In the United States, Alpha-Ethyl Benzyl Butyrate is listed among synthetic flavoring substances and adjuvants permitted for use under 21 CFR 172.515. This regulation establishes that such substances may be safely used in food under good manufacturing practice conditions, without specifying quantitative use limits, thereby providing a regulatory basis for its inclusion in flavor formulations. Inclusion in the FDA’s Substances Added to Food inventory reflects its recognized identity, technical function and acceptance in food flavorings subject to regulatory oversight. Internationally, this substance has been evaluated by expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA), which has reviewed it as part of its Flavoring Group Evaluations, concluding that existing levels of intake from use as a flavoring do not raise safety concerns when used appropriately. This global evaluation framework supports regulatory and industry confidence in the compound’s role as a flavoring agent. In the European Union, flavoring substances undergo group-based assessments conducted by EFSA, where structurally related esters have been appraised for safety under the Union’s flavoring regulations. While EFSA’s assessments often group multiple related compounds, they provide a structured basis for determining whether a substance warrants inclusion in permitted flavorings lists, applying criteria such as intake estimates and toxicological thresholds.

Taste And Functional Properties

Alpha-Ethyl Benzyl Butyrate exhibits a distinctive taste and aroma profile characterized by sweet, floral-fruity notes that can evoke jasmine, apricot and plum, as described in flavor industry references. Such sensory attributes make it particularly valuable for enhancing or rounding out fruit-forward flavor profiles, especially in applications where a delicate balance of aroma and taste is desired. The compound’s solubility characteristics — typically soluble in organic solvents and oils but with limited water solubility — influence how it is incorporated into flavor blends and final food matrices. Functionally, this type of ester adds depth and complexity to flavors without contributing texture or nutritional attributes, and it typically performs best in trace quantities where its potent sensory qualities complement other components. Its stability under typical food processing conditions aligns with its role as a flavoring agent, though formulators consider factors such as temperature and pH to optimize sensory impact. The balance between odor and taste perception underscores its functional property as a nuanced contributor rather than a dominant flavor compound.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) represents a regulatory concept used to describe a level of daily exposure to a substance that is considered to be without appreciable health risk over a lifetime, incorporating safety factors into its determination. For flavoring agents like Alpha-Ethyl Benzyl Butyrate, expert bodies such as JECFA may evaluate toxicological data to determine whether an ADI is warranted based on typical intake scenarios. In many cases for flavoring substances with low expected dietary exposure, a formal numeric ADI may not be established if available data and exposure assessments indicate negligible risk at use levels. It is important to recognize that an ADI is a conservative construct intended to guide regulatory decisions and does not represent a recommended target for daily consumption. Rather, it provides a safety benchmark that accounts for uncertainty and variability, helping regulators and industry ensure that use levels remain within widely accepted boundaries. Interpretation of such values should always consider the context of actual dietary exposure and the nature of the substance’s use as a flavoring agent.

Comparison With Similar Additives

Flavoring esters similar to Alpha-Ethyl Benzyl Butyrate, such as benzyl butyrate and allyl butyrate, are also used to impart sweet, fruity or floral notes in food applications. While all three contribute to sensory profiles, their olfactory characteristics differ subtly, with benzyl butyrate often providing a pear-like note and allyl butyrate yielding pineapple-like impressions. These functional differences allow formulators to select specific esters to achieve targeted sensory outcomes in flavor blends. In terms of regulatory evaluation, such esters are generally assessed within groupings of structurally related compounds by expert panels, applying consistent risk assessment frameworks and considering intake estimates. The collective safety profiles of these compounds are shaped by their structural properties, metabolic pathways and typical usage patterns. Compared with some other flavoring chemicals, Alpha-Ethyl Benzyl Butyrate’s profile exemplifies how diverse esters can be integrated into flavor systems, with nuanced sensory and functional attributes tailored to specific product categories.

Common Food Applications Narrative

In practical food applications, Alpha-Ethyl Benzyl Butyrate is integrated into flavors destined for a wide array of consumer products, especially where sweet and fruity characteristics are desirable. For example, beverage formulations such as fruit juices, flavored waters and soft drinks may incorporate flavor blends that use trace levels of this ester to accentuate natural fruit notes or to provide continuity between different sensory elements. Confectionery items like hard candies, gummies and coatings often rely on precise combinations of flavoring agents to achieve a balanced and appealing profile, with compounds like Alpha-Ethyl Benzyl Butyrate contributing subtle layers of sweetness and aroma. Baked goods, including cakes, pastries and frostings, may similarly benefit from its inclusion in complex flavor systems designed to mimic or enhance fruit, floral or dessert-like sensations. Dairy-based products such as flavored yogurts and ice creams can also incorporate such esters in their flavor packages to enrich sensory complexity without introducing substantive changes to texture or mouthfeel. Across these product categories, the use of flavoring agents like Alpha-Ethyl Benzyl Butyrate supports manufacturers in delivering consistent and appealing taste experiences that align with consumer expectations for quality and flavor intensity.

Safety & Regulations

FDA

  • Notes: Inclusion in the CFR section provides permitted use context but does not equate to specific numeric approval values.
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA group evaluations include related substances but do not list a specific numeric ADI for this compound.

JECFA

  • Notes: JECFA evaluation concluded no safety concern at current intake levels but did not assign a numeric ADI on the available summary.

Sources

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