2-ACETYL-4-ISOPROPYLPYRIDINE

CAS: 142896-09-1 FLAVORING AGENT OR ADJUVANT

2-ACETYL-4-ISOPROPYLPYRIDINE is a chemical flavoring agent or adjuvant evaluated internationally by expert bodies and used to contribute specific sensory properties in food and beverage applications.

What It Is

2-ACETYL-4-ISOPROPYLPYRIDINE is a defined chemical compound used in the food and flavor industry as a flavoring agent or adjuvant. This class of ingredients comprises discrete organic compounds that contribute characteristic aroma and taste attributes to food and beverage formulations. The substance is identified by the Chemical Abstracts Service (CAS) registry number 142896-09-1, which is a unique identifier assigned to this specific molecular entity. It has also been assigned a JECFA number of 2155 by the Joint FAO/WHO Expert Committee on Food Additives, reflecting its evaluation status in international flavoring evaluations. The structural class of this compound is a substituted pyridine derivative, and such molecules often have distinct olfactory profiles that make them useful in flavor formulations. In regulatory dossiers and chemical databases, this compound may appear under various systematic names and synonyms. One of the more descriptive systematic names is "ethanone, 1-(4-(1-methylethyl)-2-pyridinyl)-", which corresponds to the same chemical structure and functional group arrangement. Flavor chemists often refer to it by simplified shorthand names or by its FEMA number in the context of food flavoring inventories. Although flavoring agents are technically additives, they are distinct from nutrients or preservatives because their primary role is sensory enhancement, not structural modification or shelf life extension. From a consumer perspective, the ingredient itself is not something that appears in food labeling in everyday language; rather, its presence may be implied by broad terms such as "artificial flavors" or "flavoring components". Regulatory frameworks often allow the use of such flavoring agents at levels consistent with good manufacturing practice, meaning the minimum necessary to achieve the desired sensory effect rather than arbitrary high concentrations.

How It Is Made

2-ACETYL-4-ISOPROPYLPYRIDINE is synthesized through controlled organic chemistry processes that are typical for pyridine derivatives. While the specific commercial manufacturing route may vary by producer, general methods for substituted pyridine ketones involve the reaction of appropriately substituted pyridine precursors with acylating agents under conditions that promote formation of the ketone functionality. In one general approach, an isopropyl-substituted pyridine intermediate is reacted with an acid chloride or anhydride to introduce the acetyl group on the nitrogen-containing heterocycle. Such reactions are typically catalyzed under conditions that control side reactions and maximize yield. After synthesis, the crude product undergoes purification steps to remove unreacted starting materials, catalysts, and by-products. These purification steps may include distillation, crystallization, or chromatography depending on the specific industrial workflow. The purified flavoring compound is then quality tested against established chemical specifications that define parameters such as purity, absence of contaminants, and other relevant physicochemical characteristics. This quality testing is essential because flavoring agents are intended for incorporation into food and beverage systems, where deviations in purity could alter sensory outcomes or lead to regulatory non-compliance. Commercial manufacturers are expected to adhere to Good Manufacturing Practice (GMP) principles, which include appropriate documentation of synthesis steps, impurity profiles, traceability, and batch consistency. However, details of proprietary manufacturing processes are typically not publicly disclosed and remain within corporate technical documentation. What is known from public sources is that the compound is available in high purity grades suitable for flavor applications and is handled according to chemical safety guidelines throughout production.

Why It Is Used In Food

2-ACETYL-4-ISOPROPYLPYRIDINE is used in food formulations because of its ability to contribute distinctive sensory characteristics that are desirable in certain flavor profiles. Flavor chemists select compounds like this based on their odor-active properties, which can include notes that are green, herbaceous, or reminiscent of specific botanical cues. In complex flavor systems, such discrete molecules can be used to enhance, round out, or balance the overall sensory impression of the product. Flavoring agents such as this are especially valuable when formulators seek to replicate natural tastes and aromas or when they want to achieve a consistent sensory profile that natural extracts alone cannot provide. Natural extracts can vary in composition due to seasonal, climatic, and botanical differences, whereas synthetic or semi-synthetic flavoring agents provide a stable target compound. Their use is therefore common in processed foods, confections, and beverages where consistency across production lots is a priority. Another rationale for using discrete flavoring agents rather than whole plant extracts is that they can often be used at very low levels, minimizing interference with other product properties such as color, texture, and nutritional content. Flavoring agents are also typically designed to be compatible with a wide range of food matrices, from aqueous beverage systems to fat-rich confectionery and baked goods. The ability to function reliably across these matrices makes them versatile tools for product developers.

Adi Example Calculation

Because a specific numeric acceptable daily intake (ADI) was not established for 2-ACETYL-4-ISOPROPYLPYRIDINE in the JECFA evaluation, it is not possible to provide a precise mathematical example calculation applying a numeric ADI value. However, illustrative reasoning for flavoring agents generally can be described. If an ADI for a compound were established, for example, at a hypothetical value X mg/kg bw/day, the total daily allowable intake for a person would be calculated by multiplying that ADI by the individual’s body weight. For a person weighing Y kilograms, the allowable daily intake would be X times Y milligrams per day. This sort of calculation helps regulators and risk assessors estimate whether typical use levels in foods could approach or exceed the safe threshold. In the absence of a numeric ADI for this compound, such calculations are not performed with specific numeric values but rely instead on qualitative assessments of exposure and safety.

Safety And Health Research

Safety assessment for flavoring agents like 2-ACETYL-4-ISOPROPYLPYRIDINE focuses on understanding whether exposure at levels present in food could pose health risks. Expert committees such as JECFA use toxicological data, chemical characterization, and intake estimates to determine whether there are concerns for genotoxicity, chronic toxicity, or other endpoints relevant to human health. The evaluation for this compound concluded that there was no safety concern at current levels of intake when used as a flavoring agent, which typically implies that the available data did not indicate adverse effects at those exposure levels. This sort of conclusion is based on a weight-of-evidence approach encompassing studies on repeat dose toxicity, metabolism, and structure-activity relationships. Despite this, comprehensive peer-reviewed literature on specific health effects or mechanisms of action for this compound in humans is limited. Such gaps are common for flavoring agents used at very low concentrations where traditional toxicological studies may not focus on them individually. As such, available evaluations emphasize that the safety concern is minimal under conditions of intended use, rather than asserting broad claims about physiological effects. It is also important to note that regulatory safety assessments consider total exposure from all relevant food sources and apply conservative assumptions to protect public health.

Regulatory Status Worldwide

The regulatory status of 2-ACETYL-4-ISOPROPYLPYRIDINE varies by jurisdiction and depends on how national or regional authorities classify and permit specific flavoring agents. At the international level, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated this compound as a flavoring agent under JECFA number 2155 and has reported that there is no safety concern at current levels of intake when used as a flavouring agent. This conclusion is based on a formal evaluation including specification and toxicological review by an expert committee convened by the Food and Agriculture Organization of the United Nations and the World Health Organization. The JECFA evaluation comments are publicly accessible and provide the basis for international risk assessment and regulatory consideration in many countries. However, the JECFA summary does not assign a specific numerical acceptable daily intake (ADI) value, which suggests that no quantitative limit was established in that evaluation. In the United States, this compound appears in the FDA’s Food Substances Added to Food inventory (formerly known as EAFUS), where substances that have been evaluated by FEMA and JECFA are listed. Inclusion in this inventory indicates recognition and listing but does not by itself constitute an affirmative FDA regulation that specifically authorizes the substance in a given food category. Furthermore, generic provisions exist for synthetic flavoring substances such as those in Title 21 CFR 172.515, which describe the conditions under which synthetic flavoring substances and adjuvants may be used, provided they comply with good manufacturing practice. However, this generic regulatory citation does not explicitly list 2-ACETYL-4-ISOPROPYLPYRIDINE by name in the regulation text, so a direct CFR section specific to this compound cannot be asserted without explicit evidence. In other jurisdictions such as the European Union, flavoring substances are regulated under EU flavoring regulations and may be subject to evaluation by the European Food Safety Authority (EFSA). At this time, authoritative EFSA documentation specific to this compound and its assignment of an E-number or numeric ADI could not be identified, so it is not possible to assert a specific EU regulatory status. National authorities in other regions may also rely on JECFA evaluations or have their own flavoring approved lists that include analogous substances.

Taste And Functional Properties

2-ACETYL-4-ISOPROPYLPYRIDINE demonstrates distinct organoleptic properties that influence how it contributes to flavor formulations. According to chemical and sensory references, this compound has been described as having a green, grassy, and leafy aroma profile with additional floral or violet-like nuances at certain concentrations. These sensory characteristics make it useful when formulating flavor profiles that aim to evoke freshness, herbal notes, or botanical complexity. Because sensory perception is subjective and context-dependent, trained sensory panels are often used to quantify how a compound like this influences overall flavor perception. In terms of its functional chemistry, the molecular structure of this compound suggests moderate volatility, meaning it can contribute to both aroma and taste sensations. Volatility affects how a compound partitions between the food matrix and the air above it, which in turn influences how quickly consumers perceive its odor when food is consumed or smelled. Its solubility characteristics, including limited solubility in water and greater solubility in alcohol or lipid phases, inform how it may be deployed in different types of formulations. Because flavoring agents are used at very low concentrations relative to other ingredients, their functional impact is primarily sensory rather than nutritional or structural. Formulators consider both the odor threshold of a compound and how it interacts with other flavor components when designing a final recipe. Interactions between flavoring agents can be synergistic or suppressive, meaning one compound may enhance or diminish the perceived intensity of another. These complexities underline why flavor development is both an art and a rigorous scientific process.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a concept used by regulatory and scientific bodies to describe the amount of a chemical that can be ingested daily over a lifetime without appreciable health risk. It is typically expressed in milligrams of substance per kilogram of body weight per day (mg/kg bw/day). For many compounds, numeric ADIs are established based on toxicological studies and applying safety factors to account for variability between individuals and uncertainties in data. For 2-ACETYL-4-ISOPROPYLPYRIDINE, the JECFA evaluation did not assign a specific numeric ADI, which can occur when the data support a conclusion of no safety concern at current exposure levels without a defined numeric limit. In such cases, the narrative finding serves as guidance to regulators and industry that typical use patterns do not raise health concerns. It is critical to understand that an ADI is not a recommended intake level but rather a reference point for risk assessment. ADI values are conservative and designed to encompass lifetime exposure. The absence of a numeric ADI does not mean there is no oversight or safety consideration; rather, it reflects how the scientific evaluation characterized the risk. When regulators or expert committees conclude no safety concern at current intake levels, they consider typical dietary exposure and the toxicological database collectively.

Comparison With Similar Additives

2-ACETYL-4-ISOPROPYLPYRIDINE can be contrasted with other flavoring agents that share similar roles in food formulations. For example, structurally related pyridine derivatives or small ketone compounds may be used to evoke fruity, floral, or earthy sensory notes. Each discrete molecule has its own odor threshold and profile, which informs how it is used; some may be used to impart fruity notes in beverage products, while others contribute roasted or spice-like nuances in savory systems. Compared to volatile esters commonly used in fruit flavors, pyridine derivatives often have more herbaceous or green sensory characters. From a regulatory perspective, similar flavoring agents may have differing evaluation histories and regulatory lists. Some have assigned numeric ADIs based on comprehensive toxicological data, while others have narrative safety conclusions like the one for this compound. Flavoring agents are also distinguished by how they are metabolized and their toxicological properties, which in turn affects regulatory evaluations. For product developers, the choice of one agent over another is driven by the desired sensory outcome and compatibility with the overall flavor formula rather than by broad nutritional or structural considerations.

Common Food Applications Narrative

In everyday food and beverage products, 2-ACETYL-4-ISOPROPYLPYRIDINE functions as one of many flavoring agents that help achieve the desired sensory profile without fundamentally altering the nutritional or physical properties of the product. Because it has a green or herbaceous profile, it may be included in formulations where such sensory cues are desirable. Examples of product categories where a compound with such characteristics might be used include beverages, confections, savory snacks, baked goods, and dairy-based desserts, among others. For instance, in beverage systems, especially flavored waters or soft drinks, flavor chemists may employ a suite of discrete aroma compounds to simulate natural flavor notes without relying solely on natural extracts, which can vary in composition. In confectionery applications, green or fresh aromatic notes can complement sweet, fruity, or floral components to create balance and complexity. Cheese-flavored snacks and savory crackers may use similar compounds to evoke herbal or vegetal cues that consumers associate with freshness or garden-inspired tastes. In baked goods and desserts, where thermal processing can alter or degrade natural flavor components, discrete flavoring agents with defined stability profiles provide reliability. Their inclusion enhances the final product’s sensory consistency from batch to batch. Additionally, in products such as condiments or sauces, flavoring agents may supplement or replace natural flavors to maintain cost efficiency and stability during storage and distribution. These broad applications illustrate why discrete flavoring agents are common tools in the food formulators’ toolkit, even if consumers rarely see their specific names on ingredient labels.

Safety & Regulations

FDA

  • Notes: No explicit specific CFR section listing; inclusion in Substances Added to Food inventory does not itself constitute formal FDA authorization.

EFSA

  • Notes: No specific EFSA evaluation or E-number identified in authoritative EFSA sources.

JECFA

  • Notes: JECFA evaluation concluded no safety concern at current intake levels but did not assign a numeric ADI or list an INS number on the d database entry.

Sources

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