2-ACETYL-3, 5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS

CAS: 977043-63-2 FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS is a synthetic pyrazine flavoring agent that contributes nutty and roasted notes in foods and beverages, evaluated by expert bodies including JECFA.

What It Is

2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS is a chemical flavoring substance used to impart or enhance sensory characteristics in food products. This ingredient consists of a mixture of isomeric acetylated dimethylpyrazines, which are heterocyclic aromatic compounds belonging to the pyrazine class. Pyrazines are a group of nitrogen-containing compounds known for their potent aroma and taste properties that can resemble roasted nuts, toasted grain, or caramelized notes when present in low concentrations. In regulatory and ingredient inventories in the United States, this substance appears under the identifier ‘‘2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS’’ with the CAS registry number 977043-63-2 and has been evaluated as a flavoring agent. The designation ‘‘mixture of isomers’’ reflects that the substance is not a single pure compound but includes structurally related isomers with similar sensory effects. Flavoring agents in general are used to enhance or provide a desired taste profile that may be missing or insufficient in a food formulation. In addition to defining sensory experience, these compounds may interact with other ingredients to stabilize or balance flavor profiles in complex food matrices. The pyrazine group, including 2-acetyl-dimethylpyrazines, is widely recognized in flavor science for its influence on nutty, roasted, and toasted sensory attributes in a variety of consumer products. As such, this ingredient is part of a broader category of specialty food additives that support product consistency, quality, and sensory appeal across food categories. Regulatory bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have evaluated this compound for safety in the context of its intended use as a flavoring agent; global regulatory listings often reflect these expert assessments rather than detailed numerical specifications. Consumers should understand that flavoring agents like 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS are typically used at very low concentrations in finished products, where they contribute to sensory experience without significantly altering nutritional profiles. The term ‘‘flavor enhancer’’ in the ingredient’s technical function indicates that it may both impart flavor directly and enhance other flavor notes when formulated in concert with other sensory-active compounds. Use of these agents is guided by regulatory evaluations that consider the chemical structure, exposure levels, and toxicological information available for the class of compounds represented by this substance.

How It Is Made

The manufacturing of flavoring compounds such as 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS typically involves organic chemical synthesis techniques that derive heterocyclic compounds from simpler precursors. Pyrazines can be synthesized through various organic pathways that assemble the core pyrazine ring—a six-membered aromatic heterocycle containing two nitrogen atoms—followed by specific functionalization to introduce acetyl and methyl groups at defined positions on the ring. In this case, the ‘‘acetyl’’ functional group (a two-carbon ketone moiety) and the two methyl substituents are incorporated into the pyrazine structure through controlled reactions such as condensation, alkylation, and oxidation processes that are standard in flavor and fragrance chemical production. While specific industrial routes are proprietary and may vary between manufacturers, common methods to produce substituted pyrazines include the condensation of alpha-dicarbonyl compounds with amino compounds or the cyclization of appropriate di-amino precursors under conditions that favor ring closure. Subsequent acetylation can be achieved through reaction with acetyl donors under controlled temperatures and catalysts. The generation of isomer mixtures arises when substitution at multiple positions on the ring yields structurally similar products that cannot be fully separated by conventional purification techniques. The final material is often purified to remove residual solvents or trace by-products and is subjected to quality control analyses to confirm identity and sensory attributes. Manufacturers producing food-grade flavoring agents must adhere to good manufacturing practices (GMP) and often conform to specifications outlined by expert bodies such as JECFA, which publishes descriptive monographs and functional classifications for flavoring agents. Although this ingredient’s CAS number (977043-63-2) and identification may differ across databases, the structural class it represents—acetyl dimethylpyrazines—aligns with known synthetic flavoring agents used in the food industry. Commercial suppliers may provide certificates of analysis and purity for quality assurance. Because flavoring compounds are used at trace levels, the manufacturing emphasis is on consistency, reproducibility of sensory properties, and compliance with regulatory guidelines governing food additive production.

Why It Is Used In Food

Flavoring agents like 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS are incorporated into food products to achieve specific organoleptic outcomes that meet consumer expectations. In food science, organoleptic properties refer to the aspects of food that affect the senses, including taste, aroma, and mouthfeel. This compound class is particularly valued for imparting or enhancing complex aromatic notes that are reminiscent of roasted nuts, toasted grains, and caramel-like nuances, which are difficult to achieve through natural ingredients alone or through processing methods. These sensory characteristics can elevate the overall flavor profile of a finished product and create a consistent experience for consumers each time they consume it. In addition to purely sensory reasons, flavoring agents may be used to mask undesirable off-notes that arise from processing, storage, or formulation challenges. For example, in baked goods, beverages, snacks, and confectionery products, the addition of pyrazine-based flavor enhancers can help balance the flavor matrix by complementing sweetness, acidity, or other existing flavor notes. The strategic use of flavoring agents allows food scientists to fine-tune product attributes, maintain uniformity across batches, and respond to evolving market preferences for certain taste profiles. Another consideration in the use of flavoring agents is their compatibility with other formulation components. Flavor chemists select compounds that remain stable under processing conditions—such as heat or pH changes—and that interact predictably with other additives. The mixture of isomeric acetyl dimethylpyrazines represented by this ingredient offers flexibility, as different isomers may contribute subtly different aroma impressions, allowing for tailored sensory outcomes. Because these compounds are typically used in very low concentrations, they do not significantly affect the nutritional content of foods, but rather serve a targeted technological function to deliver or enhance aroma and taste.

Adi Example Calculation

To illustrate how acceptable daily intake concepts work in practice (for ingredients where a numeric ADI is established), consider a hypothetical example using a hypothetical ADI of X mg/kg bw/day. For a person weighing 70 kilograms (approximately 154 pounds), the hypothetical daily intake at the ADI would be calculated by multiplying the body weight by the ADI value: Daily intake at ADI = body weight (kg) x ADI (mg/kg bw/day) = 70 kg x X mg/kg bw/day = 70X mg/day. In this hypothetical scenario, a 70-kg adult could theoretically consume up to 70 times the numeric ADI (in mg) of a substance each day over a lifetime without appreciable health risk, based on conservative safety factors used in ADI derivation. However, for 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS, expert evaluation by JECFA concluded there is no safety concern at current intake levels for intended use as a flavoring agent, and a specific numeric ADI was not assigned. This means that typical consumer exposures from flavor use in foods are considered to be within safe limits and that exposure is not expected to approach a threshold of concern. It is important to emphasize that this example uses a hypothetical ADI for illustrative purposes; the actual interpretation of ADIs and intake estimates depends on detailed exposure assessments and toxicological data. Additionally, numeric ADI values are set by regulatory bodies only after careful review and are specific to the compound and context of use. For this ingredient, the expert conclusion of no safety concern reflects that typical consumption patterns do not warrant a numeric ADI under current regulatory frameworks.

Safety And Health Research

Safety and health research on flavoring agents such as 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS is conducted to assess potential effects on human health when used at levels typical of food formulation. Expert bodies like the Joint FAO/WHO Expert Committee on Food Additives (JECFA) review available toxicological data, structure-activity relationships, and exposure estimates to determine whether a substance poses concern at expected intake levels. JECFA typically considers endpoints such as acute toxicity, repeated dose effects, genotoxicity, and other relevant toxicological endpoints in the context of dietary exposure. The outcome of such evaluations may conclude that there is no safety concern at current levels of intake for the intended use, as reflected in JECFA’s assessment for this compound class. It is important to note that JECFA evaluations often focus on hazard and exposure rather than definitive physiological effects in isolation; that is, they assess whether the chemical’s properties and use patterns would be expected to cause harm based on known toxicological mechanisms. When an ingredient receives a ‘‘no safety concern’’ evaluation from JECFA, this indicates that expert review concluded that typical use levels in food do not raise safety issues for consumers. However, regulatory evaluations do not typically involve extensive clinical studies in humans; rather, they rely on a combination of animal studies, mechanistic data, and exposure assessment models. Because this ingredient is used in food products at very low concentrations, direct research linking its presence to specific health outcomes in humans is limited. Safety evaluations by recognized expert committees serve as the basis for regulatory decisions and ingredient listings. Ongoing research into flavor compounds and their metabolic pathways may be published in scientific literature, but the primary reference for safety in regulatory contexts is JECFA’s evaluation. As new data emerge, expert committees may reassess ingredients to ensure that safety conclusions remain appropriate based on the best available evidence.

Regulatory Status Worldwide

The regulatory status of 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS varies by region and is informed by expert evaluations by international bodies. In the United States, this substance appears in the Substances Added to Food inventory, formerly known as Everything Added to Food in the United States (EAFUS), which lists food additives and flavoring substances that have been evaluated by expert bodies such as the Flavor and Extract Manufacturers Association (FEMA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA). However, inclusion in this inventory does not, by itself, constitute an explicit FDA approval under a specific Code of Federal Regulations (CFR) section, and there is no direct CFR citation for this ingredient’s use in foods in the public FDA regulatory listings. Consequently, the status of "approved" in U.S. regulations is unclear on a specific CFR basis. The FDA’s Substances Added to Food inventory explains that it is a partial list and that inclusion does not necessarily indicate FDA evaluation or approval for food use. On the international stage, JECFA has evaluated 2-ACETYL-3,(5 OR 6)-DIMETHYLPYRAZINE and assigned it JECFA number 786, classifying it within food flavoring agents. JECFA’s evaluation concluded that there is no safety concern at current levels of intake when used as a flavoring agent, reflecting an expert assessment of toxicological and exposure information. JECFA’s role is to provide scientific advice that member countries can use to establish or harmonize regulations, and its evaluations are documented in the WHO/FAO database of food additive evaluations. Because JECFA evaluations focus on safety at levels of use and do not necessarily assign an Acceptable Daily Intake (ADI) in numeric terms when the substance does not pose a safety concern, specific numeric ADI values may not be established in the evaluation summaries. In regions such as the European Union, flavoring substances are subject to evaluation by the European Food Safety Authority (EFSA), which maintains a food additive database including flavoring agents. While specific E-number assignments apply to certain classes of additives, not all flavoring agents receive unique E-numbers, and the regulatory treatment may differ between jurisdictions. Regulatory frameworks in other countries often reference JECFA and FEMA evaluations when establishing local provisions for the use of flavoring agents. Overall, the ingredient’s regulatory status is informed by expert safety evaluations, and compliance with local laws and regulations is the responsibility of food manufacturers and ingredient suppliers.

Taste And Functional Properties

The sensory characteristics of 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS stem from its pyrazine core structure, which is known for low odor thresholds and potent aroma activity. Individuals trained in sensory evaluation describe compounds in this class as conveying roasted, nutty, toasted, or caramel-like notes, which can be desirable in a variety of food applications such as baked goods, snacks, and savory products. These sensory impressions originate from the way the human olfactory system interacts with volatile heterocyclic compounds; even at low parts-per-million or parts-per-billion levels, pyrazines can contribute significantly to the overall aroma profile of a product. From a functional standpoint, this ingredient is considered a flavor enhancer or flavoring agent. ‘‘Flavor enhancer’’ refers to a substance that modulates the expression of existing flavors or amplifies certain desirable sensory notes without necessarily imparting strong intrinsic flavor at the level of use. ‘‘Flavoring agent’’ denotes that the substance contributes a specific sensory character, such as nutty or roasted notes, to the food matrix. The mixture of isomers reflects structural variations that may influence volatility, perception threshold, and odor profile. In practice, formulators blend this ingredient with other flavor compounds to achieve a balanced sensory effect that aligns with the desired product profile. In terms of physical properties, flavoring compounds like acetyl dimethylpyrazines are often moderately volatile organic molecules with varying degrees of solubility in water and lipid phases, depending on formulation context. Their volatility allows them to contribute to aroma perception during consumption, especially when volatile components reach the olfactory receptors retronasally. Stability under processing conditions—such as heat applied during baking or extrusion—is an important consideration, as some flavor compounds can degrade if not formulated appropriately. The choice of carrier, solvent, or encapsulation technique can influence the functional performance and delivery of the aroma-active molecules.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a concept used in food safety to describe the amount of a substance that can be consumed every day over a lifetime without appreciable health risk, based on available toxicological data. The ADI is typically expressed in milligrams of substance per kilogram of body weight per day (mg/kg bw/day) and incorporates safety factors to account for uncertainties and variability in human responses. For many flavoring agents, including 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS, expert bodies like JECFA may conclude that there is no safety concern at current levels of intake when used as intended, which means that a specific numeric ADI may not be established. In such cases, the evaluation reflects that the available data and typical exposure estimates do not indicate a risk that would warrant setting a numerical ADI. Regulatory assessments consider both the chemical structure of the compound and the expected use levels in food products to determine whether routine consumption is likely to exceed thresholds of concern. Consumers should understand that the absence of a numerical ADI does not imply that the substance is unsafe; rather, it reflects that expert review concluded that typical exposures in foods are sufficiently low and that established safety margins cover potential risk. An ADI, where established, provides a reference point for regulators and industry to manage ingredient use, but it is not a recommendation for daily consumption. Instead, it serves as a protective benchmark to ensure that food additives used in products remain within scientifically supported safety limits. In the case of this ingredient, the ‘‘no safety concern’’ conclusion by JECFA indicates that current use patterns are consistent with safe exposure levels based on expert analysis.

Comparison With Similar Additives

Several flavoring agents share functional similarities with 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS, particularly within the class of pyrazine derivatives used in food applications. For example, 2-acetyl-3,5-dimethylpyrazine and 2-acetyl-3,6-dimethylpyrazine (closely related structural isomers) contribute roasted, nutty, or toasted sensory notes that are valued in baked goods, snacks, and beverage flavorings. These compounds often appear together in flavor formulations because the mixture of isomers can offer a broader sensory profile compared to a single isomer. Another related additive is 2,3,5-trimethylpyrazine, which also provides roasted and nut-like aroma characteristics and is used to enhance sensory complexity in processed foods. Like the acetylated pyrazines, trimethylpyrazine derivatives are selected based on their odor-active properties and compatibility with other flavor ingredients. Compared to other functional flavor enhancers outside the pyrazine class, such as certain ketones or lactones used to impart vanilla or caramel notes, acetylated dimethylpyrazines tend to emphasize roasted or toasted sensory qualities. Whereas lactones might evoke creamy or fruity impressions, pyrazines are distinctive for their toasted, nutty attributes. Food formulators choose among these classes depending on the desired end-note and the food matrix in which the flavor is incorporated. Each compound’s sensory profile, volatility, and stability under processing conditions influence its selection and concentration. Despite their sensory benefits, the regulatory evaluation of flavoring agents focuses on safety at typical use levels rather than direct performance comparisons. Expert bodies consider the structural class and existing data to determine whether use as a flavoring agent is consistent with safe exposure, which supports the inclusion of such compounds in ingredient inventories used by manufacturers. By understanding the relative sensory contributions and regulatory considerations of similar additives, food technologists can design balanced flavor systems that meet consumer expectations.

Common Food Applications Narrative

In commercial food and beverage formulations, flavoring agents such as 2-ACETYL-3,5(OR 6)-DIMETHYLPYRAZINE, MIXTURE OF ISOMERS are often used to impart specific sensory characteristics that are associated with roasted, nutty, or toasted profiles. These sensory cues are highly valued in categories where consumers expect complex aroma profiles, such as baked goods, breakfast cereals, snack chips, and confectionery products. In many instances, the sensory impact of this compound class complements other flavor constituents, enabling food scientists to craft nuanced taste experiences that resonate with consumer preferences for depth and richness. For example, baked goods like breads, crackers, and cookies often rely on a blend of flavor compounds to evoke the freshly baked or toasted sensation. Pyrazine derivatives are among the suite of flavor components that may be selected to reinforce these sensory impressions, especially when natural ingredients alone do not produce the desired aromatic intensity. Similarly, in savory snacks and processed foods, pyrazine-based flavor enhancers can contribute to ‘‘roasted’’ or ‘‘grilled’’ notes that enhance overall acceptability. Beverage applications, such as coffee-flavored or caramel-flavored drinks, may also incorporate synthesized flavoring agents to achieve consistent organoleptic properties. In products that simulate the sensory experience of roasted coffee or cocoa, compounds with nutty and toasted characteristics play a supporting role in balancing bitterness, sweetness, and other sensory dimensions. Confectionery items such as toffees, caramels, and nut-flavored candies benefit from the addition of pyrazine derivatives to deepen sensory complexity and provide continuity across product lines. In all these applications, the concentration of flavoring agents is carefully controlled by formulators to achieve the intended sensory outcome without overwhelming the flavor profile. The use of such ingredients is governed by regulatory frameworks that reflect expert safety evaluations and functional assessments of flavor compounds. While this ingredient’s regulatory status may differ between jurisdictions, its technical function remains centered on enhancing or contributing to flavor profiles in consumer food products.

Safety & Regulations

FDA

  • Notes: Inclusion in the FDA Substances Added to Food inventory does not constitute explicit FDA approval under a CFR section; specific regulations were not identified.

EFSA

  • Notes: No specific EFSA evaluation with numeric ADI was found; EFSA status for this compound class is unclear.

JECFA

  • Notes: JECFA concluded no safety concern without assigning a numeric ADI.
  • Adi Display: No safety concern at current intake levels when used as a flavouring agent

Sources

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