2-ACETYL-4-ISOPROPENYLPYRIDINE

CAS: 142896-11-5 FLAVORING AGENT OR ADJUVANT

2-ACETYL-4-ISOPROPENYLPYRIDINE is a pyridine-derived flavoring compound with a distinctive green, grassy and minty aromatic profile evaluated for use in food flavor applications by expert panels.

What It Is

2-ACETYL-4-ISOPROPENYLPYRIDINE is a heterocyclic organic compound belonging to the pyridine class of chemicals, identifiable by the Chemical Abstracts Service (CAS) registry number 142896-11-5 and recognized as a flavoring agent or adjuvant in food applications. It is characterized by a ketonic structure in which an acetyl group and an isopropenyl substituent are attached to a pyridine ring, giving it both molecular complexity and sensory relevance. The compound is listed under the Flavor and Extract Manufacturers Association (FEMA) identifier 4636, reflecting its evaluation and recognition for use in food flavoring contexts, though this FEMA number does not itself guarantee regulatory approvals in all jurisdictions.1 2-ACETYL-4-ISOPROPENYLPYRIDINE is known by several systematic and descriptive names in the scientific and technical literature, including ethanone derivatives noted in flavor chemistry reference data. It has a molecular formula of C10H11NO and appears as a colorless to pale yellow liquid with aromatic properties that contribute to its utility in certain flavor blends. While not ubiquitous in all food categories, its sensory attributes make it distinctive in certain flavor formulations.2 The compound’s function in food systems is primarily sensory, contributing fresh, green and minty aromatic notes to compositions where such sensory qualities are desirable. Its classification as a flavoring agent or adjuvant reflects this sensory role rather than broad technological functionality like emulsification or preservation, and usage patterns are typically guided by flavor industry expertise and regulatory guidance where applicable. As with many flavoring substances, its presence in a final food product is usually at low concentrations, optimized to enhance or balance sensory profiles in complex formulations.

How It Is Made

The production of 2-ACETYL-4-ISOPROPENYLPYRIDINE for industrial use typically involves organic synthesis techniques oriented toward pyridine derivatives, rather than direct extraction from natural sources. Pyridine-based compounds can be prepared through a series of controlled reactions in which functional groups are strategically introduced into the heterocyclic ring. For example, precursor molecules can be functionalized through acetylation and alkylation steps under conditions that favor substitution at targeted positions on the ring.3 In commercial contexts, manufacturers of flavor and fragrance chemicals generally source high-purity 2-ACETYL-4-ISOPROPENYLPYRIDINE from specialized chemical suppliers who produce the compound under controlled conditions consistent with industrial manufacturing practices. Standard quality control methods such as gas chromatography and spectroscopic characterization are used to verify purity and identity before distribution for flavor formulation use. Once synthesized and purified, the compound may be formulated into liquid or solvent-diluted stocks for easier handling in flavor laboratories. Although the flavor industry values natural extracts when possible, many functional flavor components including 2-ACETYL-4-ISOPROPENYLPYRIDINE are synthesized because of cost, consistency, and availability considerations. Natural analogues or naturally sourced materials, such as essential oils containing similar aromatic constituents, may also contribute to a product’s profile, but synthetic production allows for precise control over the sensory contribution and supply chain reliability. Manufacturers must ensure that production adheres to good manufacturing practices (GMP) appropriate to food-grade substances, even where regulatory status varies by region.

Why It Is Used In Food

The principal rationale for using 2-ACETYL-4-ISOPROPENYLPYRIDINE in food products centers on its unique sensory contribution. In flavor chemistry, there is a need for compounds that reliably impart specific aromatic qualities, and this compound’s green, grassy and minty notes make it valuable in formulations that require fresh herbaceous characteristics.2 Flavorists and product developers often work with a palette of compounds that include both naturally occurring extracts and synthetic flavoring agents. 2-ACETYL-4-ISOPROPENYLPYRIDINE occupies a niche within this palette where its sensory signature enhances or balances other flavor notes, particularly in products such as chewing gum, confectionery, beverages and certain baked goods where nuanced aromatic effects can improve overall sensory perception. Its use is typically at levels optimized for sensory impact without dominating the overall flavor profile. Beyond direct flavor enhancement, the presence of compounds like 2-ACETYL-4-ISOPROPENYLPYRIDINE in flavor blends can support consumer expectations for freshness or naturalness when aligned with other ingredients that evoke similar sensory impressions. As consumer preferences evolve and demand for complex flavor profiles increases, flavoring agents that offer distinct aromatic contributions remain an important part of the flavor industry’s toolkit.

Adi Example Calculation

To illustrate the concept of an ADI in a general sense (not specific to this compound), consider a hypothetical flavoring agent with an established ADI of X mg per kilogram of body weight per day. For a person weighing 70 kilograms, the total daily intake would be 70 times X mg. This is a conceptual calculation that food safety authorities might use when evaluating exposure from multiple food sources. Because 2-ACETYL-4-ISOPROPENYLPYRIDINE does not have a publicly established numeric ADI, this illustration serves to demonstrate how ADIs are applied rather than to specify a value for this ingredient.

Safety And Health Research

Safety evaluation of flavoring agents typically involves toxicological assessment to identify potential hazards and to determine whether a substance poses a risk at expected levels of dietary exposure. For 2-ACETYL-4-ISOPROPENYLPYRIDINE, evaluations by expert panels such as those associated with FEMA consider available toxicological data and exposure estimates to inform judgments about safe use in flavor applications.2 In the broader scientific literature, detailed toxicological studies for every flavoring compound are not always available, particularly for those used at low concentrations. This does not necessarily imply risk but reflects the prioritization of studies toward compounds with significant exposure or structural alerts. Regulatory safety assessments often consider data on acute toxicity, genotoxicity, subchronic toxicity, and other endpoints to form a weight-of-evidence perspective. In the case of 2-ACETYL-4-ISOPROPENYLPYRIDINE, specific in-depth safety studies published in peer-reviewed journals may be limited, and authoritative evaluations such as those by expert committees or regulatory bodies should be consulted where available. Manufacturers and flavorists rely on a combination of expert evaluations, regulatory guidance, and industry standards to manage safety considerations. Good manufacturing practice, usage level recommendations, and adherence to flavor industry norms are central to ensuring that flavoring agents do not contribute to unreasonable risk in food products.

Regulatory Status Worldwide

The regulatory status of 2-ACETYL-4-ISOPROPENYLPYRIDINE varies by jurisdiction and is shaped by individual food safety authorities’ evaluations. In the United States, it is listed in the Substances Added to Food inventory, formerly known as EAFUS, reflecting recognition of its use as a flavoring agent or adjuvant with an associated FEMA number (4636).5 This listing does not equate to a direct ‘‘approval’’ under specific Code of Federal Regulations (CFR) sections but indicates that the substance is acknowledged within regulatory inventories for use in the food supply under conditions consistent with good manufacturing practice. The Flavor and Extract Manufacturers Association (FEMA) maintains a flavor ingredient library in which 2-ACETYL-4-ISOPROPENYLPYRIDINE appears with evaluation notes based on expert panel assessments.0 Panels such as those convened by FEMA often assess flavoring substances for safety and usage conditions in the context of flavor formulation. However, these evaluations are separate from formal regulatory approvals and must be interpreted within the broader regulatory framework of national food safety authorities. Internationally, regulatory positions may differ. Some jurisdictions rely on expert committee evaluations such as those undertaken by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) where available, though specific numeric acceptable daily intake values and regulatory permissions are not always established for every flavoring compound. Where such international evaluations exist, they are referenced by national agencies when setting local standards. In many regions, substances recognized as flavoring agents may be permissible under general provisions for flavor use, provided appropriate safety data support their application and labeling complies with local regulatory requirements.

Taste And Functional Properties

From a sensory perspective, 2-ACETYL-4-ISOPROPENYLPYRIDINE exhibits a combination of green, grassy, minty and subtly sweet aromatic notes, characteristics that define its appeal in specific flavor applications. These sensory descriptors are documented in flavor chemistry databases where the compound is profiled for odor and taste as part of its functional evaluation in formulations.2 The functional properties of this compound extend beyond basic aroma; its solubility parameters, relative stability, and compatibility with typical flavor carriers influence how it behaves in complex food systems. It generally shows moderate solubility in alcohol-based carriers and limited solubility in water, which is common for many volatile flavor constituents that are optimized for integration into lipid or mixed solvent systems. This solubility behavior affects how the compound is incorporated into different product types and can determine formulation strategies for achieving the desired sensory effect. Thermal and pH stability are additional practical considerations. While detailed stability data may vary depending on the matrix in which the compound is used, many flavoring agents with similar structures are evaluated for resilience under a range of processing conditions. A compound’s stability impacts not only sensory retention through processing and storage but also labeling and regulatory compliance when used in products with diverse manufacturing steps.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a concept used by food safety authorities to describe the estimate of a daily exposure to a substance that is considered to be without appreciable health risk over a lifetime. ADIs are typically expressed in terms of milligrams of substance per kilogram of body weight per day and are derived from toxicological data with safety factors applied to account for uncertainty. For many flavoring compounds including 2-ACETYL-4-ISOPROPENYLPYRIDINE, specific numeric ADI values may not be established publicly on regulatory databases, especially if usage levels are low and existing evaluations indicate no safety concern at those levels. In such cases, expert panels or regulatory bodies may provide qualitative assessments indicating that current uses do not raise safety concerns. Where numeric ADIs are not established, this reflects a combination of limited exposure and the absence of evidence suggesting risk at typical flavor usage levels. Understanding an ADI helps food technologists and regulators contextualize the margin of safety for food additives. It is important to note that an ADI is not a recommended intake level for consumers but rather a regulatory tool to ensure that cumulative exposure remains within bounds that experts deem safe based on available data.

Comparison With Similar Additives

Flavoring agents with green, herbal or minty sensory characteristics often form a group of compounds that flavorists may consider in similar applications. For example, menthol provides pronounced mint character in a variety of confectionery and oral products, while cis-3-hexenol is known for its green, fresh aroma in beverage and savory applications. These compounds differ in chemical structure and sensory intensity, influencing their selection based on product requirements. Comparatively, 2-ACETYL-4-ISOPROPENYLPYRIDINE’s unique combination of green, grassy and minty notes situates it within a subset of flavor compounds that evoke freshness without the dominant cooling effect of menthol. Such nuanced differences inform how flavorists blend ingredients to achieve specific sensory targets. Other pyridine derivatives may contribute woody or earthy notes, providing additional complexity in flavor design. Ultimately, the choice among these compounds depends on the desired sensory profile, product matrix, and regulatory context.

Common Food Applications Narrative

In contemporary food and beverage development, flavoring agents play a central role in shaping consumer experiences. 2-ACETYL-4-ISOPROPENYLPYRIDINE, with its distinctive aromatic characteristics, finds application where fresh, green or minty flavor notes are sought. For example, in formulations of chewing gum and confectionery, flavorists may incorporate this compound to accentuate vegetal or herbal motifs that balance sweetness or complement other aromatic ingredients. Such applications are chosen carefully to align with product identity and consumer expectations. Beverages, particularly those with botanical or herbal themes, may also benefit from the sensory influence of compounds with grassy and minty qualities. In such contexts, 2-ACETYL-4-ISOPROPENYLPYRIDINE can contribute to the perception of freshness or natural herbal character, factors that are increasingly relevant to consumers seeking flavor complexity. In baked goods and certain dessert products, this compound’s aromatic profile can interact synergistically with other flavor constituents to produce layered and interesting taste experiences. Across product categories, use levels are typically low and informed by expert sensory evaluation. The compound’s role is not as a primary flavor note but as part of a broader ensemble of ingredients that together define the final sensory impact. This nuanced approach is emblematic of modern flavor development, where multiple components are combined to achieve depth and character in finished food products.

Safety & Regulations

FDA

  • Notes: Direct CFR regulatory language specific to this compound for food additive approval was not found; listed in FDA Substances Added to Food inventory reflecting flavor usage context.5

EFSA

  • Notes: EFSA specific regulatory evaluation or numeric ADI not identified in available authoritative sources.

JECFA

  • Notes: JECFA evaluation references available via FEMA material but numeric ADI values and year are not explicitly shown in the d sources.0

Sources

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