2-BUTANONE

CAS: 78-93-3 FLAVORING AGENT OR ADJUVANT

**2-Butanone** is a chemical compound used as a flavouring agent or adjuvant in food products. It is a ketone with a characteristic sharp, sweet odor and is included in U.S. food additive regulations and international flavouring evaluations.

What It Is

2-Butanone Overview and Identity 2-Butanone, also known as methyl ethyl ketone or ethyl methyl ketone, is a four-carbon ketone compound used in the food industry primarily for its flavouring properties and as an adjuvant. It is a colourless liquid under standard conditions with a pungent, slightly sweet odour that enhances certain flavour profiles when used in minute amounts. In regulatory and food science contexts, it is classified by its CAS Registry Number 78-93-3 and is recognized in food additive listings and flavouring inventories. Its function in food formulations is primarily as a flavouring substance that can impart fruity or green notes to products, depending on concentration and food matrix interactions. The compound is part of a broader class of ketone-based flavouring agents evaluated for safety by international expert committees. In scientific databases and regulatory listings, 2-Butanone appears under several synonyms reflecting its chemical and commercial usage, including methyl ethyl ketone, methylethyl ketone, butanone, and ethyl methyl ketone. These names are used interchangeably in literature, product specifications, and inventory documentation. The varied synonyms also reflect its diverse uses beyond food flavouring, but in the context of food science, the emphasis is on its role as a permitted flavouring agent under regulatory standards, ensuring that its presence in food products is consistent with good manufacturing practices and safety evaluations.

How It Is Made

Manufacturing and Chemical Formation of 2-Butanone 2-Butanone is industrially synthesized through processes that efficiently produce the ketone with high purity suitable for flavouring and other applications. The traditional production route involves the catalytic dehydrogenation of 2-butanol, where a secondary alcohol is oxidized to form the ketone structure. Alternative methods include controlled oxidation of butane and dehydration reactions starting from butane-2,3-diol precursors, using acid catalysts. These methods allow large-scale production of 2-Butanone, meeting both industrial solvent demand and the lower-volume requirements for food-grade flavouring substances. In manufacturing for food applications, strict specifications are applied to ensure that the compound meets identity and purity criteria suitable for consumption. Regulatory bodies such as international expert committees have established guidelines that define acceptable levels of residual catalysts, impurities, and by-products in the final product. These specifications contribute to the safety and consistency of 2-Butanone when used as a flavouring agent. While the core chemical pathways for production are rooted in organic chemistry techniques, the refined processes for flavour-grade material emphasize removal of contaminants and adherence to food safety standards.

Why It Is Used In Food

Functional Role of 2-Butanone in Food Products 2-Butanone is included in food formulations primarily because of its effectiveness as a flavouring agent. The compound contributes specific sensory attributes that can enhance or modify the overall taste profile of a product. When used in appropriate amounts, it helps to impart subtle fruity or green notes that can complement other flavour components. In this role, it serves as both a primary flavour contributor in certain formulations and an adjuvant that boosts the perceived intensity or stability of other flavours. Food technologists select 2-Butanone for its compatibility with a wide range of food matrices, including beverages, baked goods, dairy products, and confections. Its relative volatility means that it can deliver sensory impact without lingering excessively, and it can interact synergistically with other flavour compounds to achieve a balanced flavour profile. The use of 2-Butanone is governed by principles of good manufacturing practice, meaning it is applied in the minimum amount necessary to achieve its intended flavour effect. This approach aligns with regulatory expectations and sensory quality objectives in product development.

Adi Example Calculation

Illustrative Exposure Scenario for 2-Butanone To illustrate how exposure to a flavouring substance like 2-Butanone might be considered in a hypothetical scenario, imagine a consumer who regularly consumes a variety of food products flavoured with multiple agents. Even if 2-Butanone is present in several products, the actual amount consumed from each product is very low because flavouring agents are used in small quantities to achieve their intended sensory effect. For example, if a food product contains a flavouring mix that includes 2-Butanone at a very low concentration consistent with good manufacturing practice, and an individual consumes several servings of that product in a day, the cumulative intake of 2-Butanone from those servings remains small. When compared with thresholds established by safety evaluations, typical dietary exposures are expected to be substantially lower and not associated with adverse health effects. This illustrative approach demonstrates the logic regulators use when assessing whether a flavouring agent’s presence in food is consistent with safety benchmarks established through expert evaluations.

Safety And Health Research

Safety Evaluations and Health Research Context 2-Butanone has been the subject of safety evaluations by regulatory and scientific bodies assessing its suitability for use as a flavouring agent. These evaluations consider toxicological data, exposure estimates, and potential health effects at levels associated with intended food use. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) concluded that there is no safety concern at current levels of intake when used as a flavouring agent, indicating that typical dietary exposures from its use in foods do not raise safety issues under the conditions evaluated. This conclusion reflects international expert review of available data on the compound’s properties and expected exposure through food. While comprehensive toxicological studies examine a range of endpoints, authoritative evaluations focus on whether typical uses in food result in exposures that could pose risks to human health. In the context of food flavouring use, such exposures are generally low, as flavouring agents are applied in small quantities consistent with good manufacturing practice. As with all food additives and flavouring substances, ongoing monitoring of scientific evidence and regulatory reviews ensures that safety assessments remain current with research developments.

Regulatory Status Worldwide

Regulatory Status in Major Jurisdictions In the United States, 2-Butanone is listed in food additive regulations and flavouring inventories, indicating that it is permitted for use as a flavouring substance under specified conditions. It appears in the U.S. Food and Drug Administration (FDA) Inventory of Food Contact Substances and in food additive listings that reference sections of the Code of Federal Regulations, including 21 CFR 172.515, 172.859, 175.105, 175.320, and 177.1200, which collectively cover flavouring agents and related uses in food and food contact materials. These references establish that 2-Butanone can be used in accordance with good manufacturing practice for the intended functional effect in food formulations. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated 2-Butanone and concluded that there is no safety concern at current levels of intake when used as a flavouring agent. This evaluation, conducted and reported in expert committee reports, supports its continued use in food flavourings under recognised conditions. The JECFA evaluation is widely referenced in international food safety discussions and contributes to global confidence in its application as a flavouring substance. In other regulatory frameworks, the classification and requirements for flavouring substances vary, but many align with scientific assessments like JECFA’s, ensuring that 2-Butanone’s use is consistent with food safety principles. Compliance with regional and national regulations remains essential for food producers.

Taste And Functional Properties

Sensory Characteristics and Functional Attributes 2-Butanone exhibits a sharp, sweet, and slightly fruity aroma that can influence the sensory perception of food products when used at low concentrations. Its flavour contribution is described as clean and uplifting, often enhancing fruity or green notes in complex flavour systems. This sensory profile enables flavourists to incorporate 2-Butanone into diverse applications without overwhelming other components, provided that usage levels are carefully controlled. Functionally, the compound is relatively volatile and soluble in many food-relevant solvents, making it suitable for integration into aqueous and lipid-containing products. Its behaviour under heat and pH variations is consistent with many ketone-based flavour compounds, meaning that it can retain sensory contributions through typical food processing conditions. Its volatility also means that it contributes to aroma perception during consumption, complementing taste and mouthfeel attributes of the finished product. While sensory perception can vary depending on the food matrix, 2-Butanone’s overall contribution is valued for its ability to enhance flavour complexity and consumer appeal. Its use in flavour design requires expertise in balancing concentrations to achieve desired sensory outcomes.

Acceptable Daily Intake Explained

Understanding Acceptable Daily Intake (ADI) Concepts The concept of an Acceptable Daily Intake (ADI) is used by regulatory and scientific bodies to describe an estimate of the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. In the case of 2-Butanone, evaluations by expert committees have focused on whether typical intake levels from flavouring use fall within safe bounds. JECFA’s assessment concluded that there is no safety concern at current levels of intake when used as a flavouring agent, which implies that an ADI was not specifically needed because the anticipated exposure is considerably lower than levels associated with toxicological concern. It is important to understand that an ADI is a conservative benchmark used for risk assessment rather than a target for consumption. For flavouring substances like 2-Butanone, the amounts used in food are designed to achieve sensory effects and are often orders of magnitude below thresholds that would raise health concerns. The absence of an assigned numeric ADI reflects the expert committee’s conclusion that exposure from typical food use is unlikely to approach levels warranting an ADI allocation.

Comparison With Similar Additives

Comparing 2-Butanone with Other Ketone-Based Flavourings 2-Butanone belongs to a class of ketone-based flavouring agents that share certain chemical and sensory characteristics. Other ketone flavour compounds include acetone derivatives and longer-chain ketones that contribute varying sensory attributes depending on their structure. For instance, shorter-chain ketones may impart sharper, more volatile notes, while longer-chain ketones can introduce deeper, more complex aromatic profiles. When comparing 2-Butanone with similar additives, considerations include volatility, sensory contribution, and functional behaviour in food matrices. Some ketone flavourings may be chosen for specific aroma profiles, such as buttery or creamy notes, whereas 2-Butanone’s sweet and fruity traits suit different flavour design objectives. The selection of one ketone over another depends on desired sensory outcomes and compatibility with other ingredients. From a regulatory perspective, many ketone-based flavouring agents undergo similar safety evaluations to ensure their use is consistent with established standards. While each compound has unique properties, the common thread in their evaluation is the assessment of typical exposure levels and sensory contribution to ensure consumer safety and product quality.

Common Food Applications Narrative

Applications of 2-Butanone in Food Products 2-Butanone’s use as a flavouring agent spans a variety of food and beverage categories where subtle enhancement of sensory attributes is desired. In soft drinks and non-alcoholic beverages, it can contribute to refreshing, fruity notes that complement other flavour components. Its inclusion in baked goods supports aroma and taste profiles that are perceived as fresh or fruit-accented, particularly in products like cakes, cookies, and pastries where aromatic balance is key. In dairy desserts and frozen confections, 2-Butanone can help round out flavour profiles, adding brightness without masking primary flavour ingredients. The compound also appears in confectionery applications, including candies and flavored gums, where its volatile characteristics contribute to forward aroma and taste. In sauces and dressings, a carefully calibrated amount of 2-Butanone can elevate fruit-based or complex savoury profiles, enhancing overall flavour impact. Snack bars and fruit snacks may include this flavouring to accentuate natural fruitiness or to provide complementary aromatic complexity. Across these categories, the use of 2-Butanone is guided by food technologists who ensure that it supports the desired sensory characteristics without exceeding levels consistent with regulatory guidelines and good manufacturing practice. Its presence in these diverse product types reflects its versatility as a flavouring ingredient when applied in controlled, purposeful ways.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515 21 CFR 172.859 21 CFR 175.105 21 CFR 175.320 21 CFR 177.1200

EFSA

  • Notes: Specific EFSA evaluation for 2-Butanone was not identified in available sources; regulatory status may align with general flavouring provisions.

JECFA

  • Year: 1998
  • Notes: JECFA concluded no safety concern at current levels of intake without specifying numeric ADI.
  • Adi Display: No safety concern at current intake levels when used as flavouring

Sources

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