2-PENTANONE

CAS: 107-87-9 ANTIOXIDANT, FLAVORING AGENT OR ADJUVANT

2-Pentanone is a clear, colorless ketone used as a solvent and flavoring agent with a fruity odor.

What It Is

2-Pentanone is a small organic ketone compound characterized by a five-carbon backbone with a carbonyl group at the second carbon. It is also known by several synonyms including methyl propyl ketone, propyl methyl ketone, and ethyl acetone, reflecting its chemical structure and historical naming conventions. Its CAS Registry Number (CAS RN) is 107-87-9, and based on chemical databases and authoritative listings it is recognized as a volatile compound with a fruity, acetone-like odor and a clear, colorless appearance. 2-Pentanone is not assigned an INS or E-number; however, it functions in food systems primarily as a flavoring agent and may have ancillary antioxidant properties under specific technical uses. Chemically, 2-Pentanone belongs to the ketone family, where a carbonyl group is bonded to two alkyl groups, making it moderately polar compared with simple hydrocarbons. It is miscible with many organic solvents and has limited solubility in water. While it has industrial applications as a solvent and intermediate in chemical synthesis, its regulatory status as a flavoring or adjuvant derives from food additive regulations and expert evaluations rather than widespread direct addition in food beyond flavor contexts. Its sensory contribution often is in enhancing or modifying aroma profiles in complex food matrices.

How It Is Made

Manufacturing of 2-Pentanone involves classical organic chemistry methods that yield a relatively high-purity ketone suitable for various technical applications. Industrially, it can be synthesized by the oxidation of 2-pentanol or other appropriate alcohol precursors under controlled conditions, with subsequent purification steps to achieve food-grade or technical-grade purity. Alternative pathways include esterification-hydrolysis strategies or distillation of intermediate compounds followed by chemical transformation and refining. Purification generally uses fractional distillation under standard conditions to separate 2-Pentanone from unreacted precursors and byproducts, meeting specifications for solvent and flavor applications. Purity levels suitable for regulated uses are achieved by removing trace contaminants and ensuring the absence of toxic impurities. In some contexts, further refining may be carried out to comply with specific food additive quality standards, such as those defined by flavor specialist associations or regulatory bodies. The resulting product is typically a colorless liquid with defined sensory characteristics and physical properties.

Why It Is Used In Food

2-Pentanone is used in food primarily for its role as a flavoring agent. Its fruity and slightly sharp aroma can contribute to the overall complexity of flavor profiles in certain foods, especially in combinations with other volatile compounds. Within formulations it serves as part of a blend of aroma constituents that help achieve desired sensory attributes in flavor systems. Beyond flavor, ketone compounds like 2-Pentanone may also contribute to certain technical effects in formulations, such as volatility modulation and interactions with fat or aqueous phases, potentially influencing release of aroma during consumption. Its use as an antioxidant in foods is more limited and context-dependent; it may participate in oxidative pathways that stabilize other compounds or contribute indirectly to preservation of flavor integrity. In regulated food systems, substances like 2-Pentanone are used in the minimum quantities necessary to achieve their intended sensory effect, aligning with principles of good manufacturing practice for flavorings.

Adi Example Calculation

Because 2-Pentanone’s regulatory evaluations for flavor use do not specify a numeric ADI value in authoritative sources, a hypothetical calculation using an ADI is not applicable. In standard practice, when a numeric ADI is established for a food additive, the calculation would illustrate how much of that additive an individual could theoretically consume based on body weight. For example, if a hypothetical ADI were established in mg per kg body weight terms, multiplying that value by a person’s body weight yields an illustrative daily limit. However, in the case of 2-Pentanone, available expert assessments indicate that there is no safety concern at current levels of use, and a specific numeric ADI has not been defined in the primary regulatory evaluations.

Safety And Health Research

Safety assessments of flavoring agents like 2-Pentanone focus on toxicological data and exposure levels relevant to typical food use. Standard evaluations consider endpoints such as acute toxicity, irritation potential, metabolic pathways, and comparative safety relative to exposure from diet or natural occurrence. Research and regulatory reviews have generally indicated that at levels used in flavor applications, there are no safety concerns identified for 2-Pentanone, based on historical expert committee assessments. Available toxicological information from chemical databases suggests that high concentrations of 2-Pentanone can cause irritation to mucous membranes and respiratory effects in occupational settings; these findings underscore the importance of controlled use in industrial and food settings rather than direct translation to food safety risk. Regulatory evaluations by expert bodies take into account typical human exposure scenarios, which are significantly lower than levels associated with occupational hazards, and apply conservative safety considerations accordingly.

Regulatory Status Worldwide

In the United States, 2-Pentanone is referenced in food additive regulations under Title 21 of the Code of Federal Regulations, Part 172, Section 172.515, which covers synthetic flavoring substances and adjuvants. This regulatory section permits the use of specified flavoring agents under conditions of good manufacturing practice, indicating that 2-Pentanone may be used as a flavoring agent when incorporated in the minimum quantity required for the intended effect and otherwise complying with applicable standards. The regulation d (172.515) lists allowed synthetic flavoring substances and establishes the general regulatory framework for their use in food. Internationally, expert evaluations by organizations such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have assessed 2-Pentanone within the context of flavoring agents. JECFA has evaluated many flavor compounds and generally concluded that at current levels of intake typical for flavoring use there are no safety concerns, reflecting historical reviews of such substances. Individual countries may reference JECFA evaluations when establishing their own regulatory positions or may adopt similar provisions in national food additive regulations. Regulatory status can vary by region and jurisdiction, but authoritative evaluations and listings support its technical function in flavor applications under established conditions of use.

Taste And Functional Properties

2-Pentanone is recognized for its moderately fruity, acetone-like odor that can translate into subtle flavor nuances when used in combination with other aroma compounds. It is generally more noticeable in volatile aroma profiles rather than as a dominant taste, contributing complexity rather than a strong singular flavor note. Due to its volatility and solubility characteristics, it disperses well in both aqueous and lipid phases, which influences how its aroma is perceived in different food matrices. Functionally, 2-Pentanone behaves as a volatile aroma compound with relatively low molecular weight, allowing it to evaporate readily and interact with olfactory receptors during consumption. Its solubility in organic solvents makes it compatible with many flavor production systems and formulations. With moderate stability under normal conditions, 2-Pentanone may exhibit changes in intensity with exposure to heat or prolonged storage, which are important considerations in product development and quality control.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a technical concept used in regulatory science to indicate an estimate of safe daily exposure over a lifetime without appreciable health risk. For many flavoring agents evaluated by expert committees such as JECFA, a standard ADI may not be established numerically if the compound is judged to pose no safety concern at typical levels of intake from its intended use, which appears to be the case for 2-Pentanone. In such evaluations, ADI may be described qualitatively rather than as a specific numeric value, reflecting the regulatory judgment that normal dietary exposure from flavors does not raise safety concerns when good manufacturing practices are followed. It is important to recognize that ADI does not represent a nutritional requirement or recommended intake; rather, it is a guideline for regulatory and safety assessment. ADIs or similar safety descriptors help inform regulatory authorities when setting use conditions for food additives and flavoring agents, ensuring that consumer exposure remains within safe bounds based on available toxicological and exposure data.

Comparison With Similar Additives

When comparing 2-Pentanone with other flavoring agents, it is informative to consider common ketone and ester compounds used in flavor systems. For example, compounds such as 2-heptanone and other low molecular weight ketones share functional roles in contributing fruity or ethereal notes to flavor blends. These compounds are often regulated under similar frameworks that govern synthetic flavoring substances, with evaluations focused on safety at typical use levels rather than broad functional claims. Compared with esters such as ethyl butyrate or isoamyl acetate, which provide pronounced fruit-like aromas, 2-Pentanone tends to play a more nuanced supporting role in complex flavor profiles. Functional differences can arise from volatility, odor threshold, and the interaction with other formulation components. Such comparisons are valuable for flavorists when selecting appropriate compounds to achieve desired sensory effects, balancing potency, and regulatory considerations.

Common Food Applications Narrative

In practice, 2-Pentanone appears in specialized flavor applications where chemical complexity is desirable. It is found in flavor blends developed for products that benefit from a fruity or ethereal note, such as certain confectionery, baked goods, and beverages. These applications rely on the interaction of multiple volatile compounds to create a balanced and appealing aroma profile that resonates with consumer expectations for fruit-associated products or nuanced sensory experiences. For example, in flavored beverages and alcoholic drinks, 2-Pentanone can contribute to the overall bouquet by complementing other esters and ketones that evoke fruity aromas. In baked products like sweet breads or pastries, it may be one component of a complex flavor system that enhances perceived sweetness or fruitiness without adding sugar. Beyond consumer-facing products, flavorists may use 2-Pentanone in laboratory-developed custom flavor kits where specific aromatic characteristics are needed. Its contribution tends to be subtle and highly dependent on concentration and the presence of other aromatic molecules, so product developers typically adjust its level with precision to achieve the desired sensory outcome.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: EFSA evaluation specific data not found in sources

JECFA

  • Notes: JECFA evaluation concluded no safety concern at typical intake
  • Adi Display: No safety concern at current levels of intake as flavoring agent

Sources

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