2-BUTANOL

CAS: 78-92-2 FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

2-Butanol, also known as sec-butanol, is a secondary alcohol used as a flavoring agent and flavor enhancer in food. It appears in FDA food additive listings and has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA).

What It Is

2-Butanol is a secondary alcohol with the chemical formula C4H10O and CAS number 78-92-2. It is a clear, colorless, flammable liquid with a characteristic odor that may be described as mild and somewhat sweet. In the context of food additives, 2-Butanol functions as a flavoring agent, flavor enhancer, or adjuvant when incorporated into food formulations to contribute to or support specific sensory attributes. 2-Butanol is identified in regulatory listings for food substances, including the U.S. FDA inventory of food substances added to food, where its technical functional effect in foods is documented as "FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT" under established regulation codes. These regulatory references indicate its role in the food supply as a component that contributes to flavor characteristics in certain formulations when used in accordance with good manufacturing practices. 2-Butanol’s classification within food additives reflects its broader chemical identity as a short-chain alcohol, sharing structural similarities with other alcohols used in flavor applications.

How It Is Made

Commercial production of 2-Butanol typically involves chemical synthesis processes starting from petrochemical feedstocks. Industrially, 2-Butanol may be produced by catalytic hydration of butenes, by fermentation-derived intermediates followed by chemical conversion, or by the reduction of 2-butanone (methyl ethyl ketone). Following synthesis, the crude 2-Butanol product undergoes purification steps including distillation to achieve a grade suitable for use in flavor applications. Food-grade 2-Butanol must meet established purity criteria and specifications as documented by relevant standards-setting organizations when used as an additive. Regulatory authorities often require that food additives are produced under controlled conditions that reduce impurities and contaminants to levels considered acceptable for their intended use. These manufacturing and purification prerequisites are designed to ensure that the additive performs its intended function without introducing unintended or undesirable components into food products.

Why It Is Used In Food

The primary reason 2-Butanol is used in food is for its contribution to flavor profiles. As a flavoring agent and enhancer, it can modify or intensify sensory perceptions of taste and aroma in certain formulations, particularly in complex flavor systems. Its inclusion often supports the development of specific sensory characteristics that are difficult to achieve using natural ingredients alone. In practice, flavor chemists may balance the use of 2-Butanol with other flavoring substances to achieve the desired effect, ensuring that the overall flavor profile meets product design objectives. The additive’s volatile nature and compatibility with other flavor compounds make it useful for fine-tuning flavor perception. Use of 2-Butanol in food is accompanied by considerations such as sensory thresholds, concentration levels, and interaction with other components, which are all managed under regulatory frameworks and industry standards to ensure that its functional contribution is appropriate to the food category and application.

Adi Example Calculation

Because 2-Butanol has no numerical ADI allocated by JECFA or other authoritative bodies, illustrative ADI calculations using a specific mg/kg body weight figure are not applicable. The absence of a numeric ADI reflects that expected dietary exposures from its function as a flavoring agent are sufficiently low that a numerical guidance value was not established. Therefore, hypothetical body weight calculations based on an undefined ADI cannot be provided in a meaningful way.

Safety And Health Research

Safety assessment of food additives like 2-Butanol generally involves reviewing available toxicological data and exposure estimates. For 2-Butanol, evaluations by expert bodies such as JECFA have indicated that no ADI was allocated in its assessment, which reflects a determination that a numerical ADI was not considered necessary for its safe use at levels consistent with intended flavoring functions. Safety research on 2-Butanol includes toxicological studies that characterize its acute oral toxicity, metabolism, and potential effects at higher exposure levels, primarily from industrial or laboratory contexts rather than typical dietary exposure. Regulators evaluate data such as genotoxicity, carcinogenicity, acute toxicity, and repeated-dose studies to determine whether the substance raises concerns at exposures relevant to food use. Because 2-Butanol is used at low concentrations in flavor applications and because available data do not indicate safety issues at these exposure levels, its use under appropriate regulatory frameworks and good manufacturing practice is considered consistent with current understanding of safety considerations.

Regulatory Status Worldwide

In the United States, 2-Butanol appears in the FDA’s "Substances Added to Food" inventory, where it is associated with technical functional effects such as flavor enhancer and flavoring agent or adjuvant and is linked with specific food additive regulation codes including 21 CFR 172.515 and 176.180, which cover synthetic flavoring substances and adjuvants and other functional uses. These regulatory references indicate that 2-Butanol’s use in food is recognized within the framework of U.S. food additive regulations and subject to conditions of safe use under good manufacturing practice. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated 2-Butanol, listing it with functional classes that include flavoring agent and extraction solvent. JECFA’s evaluation indicates that no acceptable daily intake (ADI) was allocated, reflecting that an ADI has not been established for this substance, which is typical for many flavoring agents that do not require a numerical ADI due to their safety profile and use below sensory threshold levels. Regulatory status in other jurisdictions such as the European Union may be informed by such evaluations, though an explicit E-number for 2-Butanol as a food additive is not established.

Taste And Functional Properties

2-Butanol contributes subtle flavor nuances when used below sensory threshold levels, often supporting the perception of certain aromatic notes in flavor blends. Its functional behavior in food systems is influenced by its chemical properties. As a moderately volatile secondary alcohol with some water solubility and miscibility with ethanol and other organic solvents, 2-Butanol can integrate into aqueous and some nonaqueous phases of food matrices. Its effectiveness as a flavoring substance depends on factors such as concentration, food composition, processing conditions, and the presence of other flavor-active compounds. In addition to sensory considerations, 2-Butanol’s functional properties relate to its volatility and interaction with olfactory receptors, which contribute to the overall flavor experience. Because it is a flavor enhancer or adjuvant, it is typically used in small quantities consistent with good manufacturing practice and regulatory allowances that are designed to achieve the intended sensory effect without exceeding levels that could introduce off-flavors or other issues.

Acceptable Daily Intake Explained

The acceptable daily intake (ADI) concept is a health-based figure established by risk assessors to indicate the amount of a substance that can be ingested daily over a lifetime without appreciable health risk. For many flavoring agents, including 2-Butanol, no numerical ADI has been allocated by expert committees such as JECFA, which signifies that based on available data and expected levels of consumption for its intended uses, a numerical ADI value was not deemed necessary. This does not imply that there is no regulatory oversight or safety evaluation; rather, it reflects the context of low use levels and safety data that support its use within the framework of good manufacturing practice. In essence, a "no ADI allocated" designation indicates that authoritative bodies do not require a defined numeric limit, often because exposures under normal conditions of use are far below levels of toxicological concern.

Comparison With Similar Additives

When compared with other flavoring alcohols and structurally related compounds used in food flavor systems, 2-Butanol shares several sensory and functional characteristics. Like other short-chain alcohols used in flavor applications, it contributes subtle notes and interacts with olfactory receptors in ways that enhance overall flavor perception when used appropriately. Other similar additives include ethanol (used as a solvent and flavor carrier), isobutanol, and propanol derivatives, which also support flavor profiles in food products. These additives differ in volatility, sensory threshold, and interaction with food matrices, which influence their selection for specific applications. 2-Butanol’s use is balanced against such alternatives based on desired flavor outcomes, regulatory status, and compatibility with other ingredients in formulation design.

Common Food Applications Narrative

2-Butanol may be found in a variety of food products where specific flavor profiles are targeted, particularly in processed foods and beverages that rely on complex flavor blends. Its use is more common in technical flavor formulations created by flavorists and food scientists rather than directly by consumers. Typical applications include certain beverages, confectionery items, baked goods, and savory processed products where controlled flavor enhancement is desired. Within these broad product categories, 2-Butanol operates as one component among many that collectively achieve the desired taste and aroma attributes. Because it is used for its functional effect rather than as a nutritional component, its inclusion is generally at levels far below those that would contribute energy or nutritive value to the food. The use of 2-Butanol is conducted in accordance with flavor industry practices and regulatory guidance that ensure sensory quality while addressing safety and compliance requirements.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515 and 176.180

EFSA

  • Notes: EFSA specific approval status not found in sources

JECFA

  • Year: 1979
  • Notes: JECFA did not allocate a numerical ADI
  • Adi Display: No ADI allocated

Sources

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