What It Is
2,3-DIETHYL-5-METHYLPYRAZINE is a small heterocyclic organic compound classified as a substituted pyrazine with the CAS number 18138-04-0. It belongs to the chemical family of pyrazines, which are aromatic compounds commonly found in a range of natural foods and used industrially to impart flavor. As a flavoring agent or adjuvant, it is used to create or enhance specific sensory notes in food products. Natural occurrences of this compound have been reported in certain roasted foods, including coffee and nuts, where it contributes to the characteristic aroma. In industrial and food formulation contexts, it is often synthesized and incorporated into flavor blends that aim to mimic or boost roasted, nutty or earthy sensory profiles. The structure of 2,3-DIETHYL-5-METHYLPYRAZINE consists of a six-membered ring containing two nitrogen atoms along with ethyl and methyl substituents at specific positions on the ring. This molecular configuration influences its volatility and odor character, making it detectable by olfactory mechanisms at relatively low concentrations. The compound’s physical properties, such as its slight solubility in water and better solubility in organic solvents, are consistent with many other volatile flavoring agents. Its sensory contributions are often leveraged in foods that undergo heat processing or roasting, where pyrazines naturally develop during Maillard reactions. Overall, 2,3-DIETHYL-5-METHYLPYRAZINE is recognized within flavor science as a functional ingredient used to create desirable roasted and nutty aroma qualities in food products and formulations.
How It Is Made
The manufacture of 2,3-DIETHYL-5-METHYLPYRAZINE typically involves organic synthesis routes that assemble the pyrazine ring and introduce ethyl and methyl substituents at defined positions. One documented pathway begins with the condensation of a hexanedione precursor with an appropriate diamine under controlled conditions, followed by oxidative steps to complete the heterocyclic pyrazine core. This route yields a compound that is then purified to food-grade quality specifications when intended for use as a flavoring agent, with controlled levels of impurities and reaction byproducts. Industrial production is carried out under conditions that control temperature, solvent systems, catalysts, and reaction time to achieve consistent yield and purity. After synthesis, the product typically undergoes distillation or chromatographic purification to isolate the target pyrazine and remove residual reactants. Quality specifications for flavoring agents consider not only chemical identity and purity but also sensory attributes, as off-notes or contaminants can compromise the desired organoleptic effect. In addition to chemical synthesis, 2,3-DIETHYL-5-METHYLPYRAZINE is naturally generated in thermally processed foods through Maillard reactions between amino acids and reducing sugars. However, the quantities generated during cooking are typically much lower and variable compared to controlled flavoring addition. Manufacturers of flavorings rely on standardized synthetic production to ensure consistent sensory impact and to meet regulatory requirements for food use. Because pyrolytic or thermal generation in foods is complex and context-dependent, commercial production offers greater control for formulation purposes.
Why It Is Used In Food
2,3-DIETHYL-5-METHYLPYRAZINE is used in food formulation because of its ability to impart and enhance desirable sensory characteristics. Pyrazines, including this compound, are known for their contributions to roasted, nutty, earthy and toasted notes, which are highly sought after in certain food categories. Because it can evoke familiar flavor impressions such as those associated with roasted coffee, nuts, baked cereals and cooked meats, it is incorporated into flavor blends to replicate or accentuate these attributes. In flavor science, 2,3-DIETHYL-5-METHYLPYRAZINE serves not only to add aroma but also to influence flavor perception through complex interactions with other volatile compounds. It works well in combination with other flavoring agents to create more complete sensory profiles, as its distinctive notes can balance or complement sweetness, bitterness, or savory characteristics in foods. For example, in savory or roasted flavor systems, pyrazines can enhance complexity and depth. In sweet bakery applications, they can add a richer, more toasted character. Food formulators select this ingredient because of its potency; small concentrations can significantly influence sensory outcomes. This makes it cost-effective and practical for use in flavor concentrates, sensory modulators and product prototypes where consistent flavor impact is needed. Its inclusion in formulation strategies reflects both sensory objectives and consumer expectations for familiar aroma and taste cues in a wide range of processed foods.
Adi Example Calculation
For illustrative purposes, consider how an Acceptable Daily Intake (ADI) would be interpreted if one were defined. Suppose a hypothetical ADI for a substance is set at X milligrams per kilogram body weight per day. For a 70 kg adult, this would correspond to a total daily intake of 70 times X milligrams. If typical dietary exposure to a flavouring agent is orders of magnitude lower than this benchmark, regulatory bodies may conclude that current use levels present no safety concern. In the case of 2,3-DIETHYL-5-METHYLPYRAZINE, no specific numeric ADI is provided by international expert evaluations because the compound was judged not to raise safety concerns at current levels of intake when used as a flavouring agent. Thus, rather than calculating a number, stakeholders focus on relative exposure estimates. For example, if measured dietary exposures in populations are in the microgram range per day and a conventional ADI would be in the milligram range, exposure is several orders of magnitude below the threshold of concern. This conceptual comparison helps illustrate why regulators may not assign a numeric ADI.
Safety And Health Research
Regulatory evaluations of 2,3-DIETHYL-5-METHYLPYRAZINE focus on the balance between hazard potential and estimated exposure levels in food. International expert committees such as JECFA examine available toxicological data, including acute toxicity, genotoxicity and other endpoints relevant to human health, with attention to margins of safety at expected intake levels. In its evaluation, JECFA concluded that current levels of intake as a flavouring agent do not raise safety concerns, based on information available at the time of assessment. Flavoring agents like this one are typically metabolized and eliminated by the body through established pathways, and their presence in food at low concentrations is generally considered within the scope of normal dietary exposure from both natural and added sources. Toxicological assessments take into account typical use patterns in various food categories and compare estimated intakes to effect levels in experimental systems. While detailed human clinical studies specific to this compound’s effects on physiology are not routinely conducted for flavoring agents, the safety assessment process for such compounds involves conservative assumptions and safety factors. These assessments support regulatory positions that do not identify specific health concerns at intended levels of use. Because data beyond the expert review are limited in publicly accessible regulatory evaluations, discussion here reflects general principles of risk assessment rather than specific health effect claims.
Regulatory Status Worldwide
The compound 2,3-DIETHYL-5-METHYLPYRAZINE has been evaluated by international expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA), which assessed its safety as a flavouring agent. According to the JECFA evaluation, it was assigned JECFA number 777 and the committee concluded there is no safety concern at current intake levels when used as a flavouring agent. This assessment reflects expert review of toxicological and exposure data as available at the time of evaluation. The evaluation is documented in the WHO Technical Report Series. In terms of regulatory status in the United States, substances like 2,3-DIETHYL-5-METHYLPYRAZINE may appear in inventories such as FDA’s Substances Added to Food (formerly EAFUS), which compiles flavoring substances and other food ingredients. Inclusion in such inventories indicates recognition of the substance’s reported use and evaluation by bodies such as FEMA and JECFA, but does not in itself constitute a specific FDA regulation or approval in the Code of Federal Regulations. FDA’s framework for this category of ingredient includes considerations of Generally Recognized as Safe (GRAS) status for flavoring substances evaluated by expert panels. Regulatory approaches outside these contexts can vary by jurisdiction; some countries may reference Codex Alimentarius or local regulations to determine permissible use. Because specific numeric regulatory values such as maximum use limits or E-numbers were not identified in primary regulatory databases for this compound, definitive worldwide regulatory codes beyond the JECFA evaluation are not provided here.
Taste And Functional Properties
2,3-DIETHYL-5-METHYLPYRAZINE exhibits functional properties typical of volatile aroma compounds, including a relatively low odor threshold and characteristic sensory notes. It is best known for contributing nutty, roasted, earthy and toasted sensory impressions, which are highly relevant in foods that aim to evoke baked or roasted profiles. Sensory scientists often describe pyrazines as ‘aroma enhancers’ or ‘character impact compounds’ because of their ability to shape overall flavor perception even at low concentrations. From a physicochemical perspective, 2,3-DIETHYL-5-METHYLPYRAZINE is slightly soluble in water but exhibits better solubility in organic solvents, consistent with many small volatile heterocyclics. This property affects how it partitions between aqueous and lipid phases in food matrices and can influence its release during tasting or olfactory detection. Its volatility is a key factor in aroma delivery: the compound readily moves from the food matrix into the headspace above the product, where sensory receptors detect it. The stability of pyrazines like this one can vary with heat and pH. In many thermally processed foods, pyrazines form naturally through Maillard chemistry, and added pyrazines can survive typical processing conditions without significant degradation. However, extreme pH environments or prolonged high-temperature exposure can alter their sensory profile. As formulation ingredients, these compounds are selected not only for their sensory impact but also for functional robustness under intended processing and storage conditions.
Acceptable Daily Intake Explained
Acceptable Daily Intake (ADI) is a risk assessment concept used by regulatory bodies to indicate the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. For many flavouring agents evaluated by experts, including 2,3-DIETHYL-5-METHYLPYRAZINE, specific numeric ADI values may not be established if dietary exposure at typical use levels is considered well below levels associated with toxic effects. In such cases, expert committees conclude there is no safety concern at current intake levels, which effectively means the estimated exposure does not warrant setting a quantitative ADI. An ADI is not a recommended target for consumption, but rather a threshold below which regulatory bodies have determined that chronic exposure is not expected to result in adverse health effects. This is often expressed in milligrams of substance per kilogram of body weight per day. When robust toxicological data demonstrate wide margins of safety at typical intake levels, the regulatory narrative may describe the intake as safe without defining a numeric ADI. For consumers and industry stakeholders, understanding this concept helps contextualize safety assessments and regulatory decisions regarding flavoring agents. Thus, the lack of a specific numeric ADI for this compound should not be interpreted as an absence of safety evaluation; rather, it reflects expert judgment that typical use does not pose appreciable risk based on current data and consumption patterns. This concept underlies many regulatory evaluations of flavoring substances, where exposure levels are low and safety margins are considered adequate.
Comparison With Similar Additives
2,3-DIETHYL-5-METHYLPYRAZINE can be compared to other pyrazine derivatives used as flavouring agents, such as 2,5-Dimethylpyrazine and 2,3,5-Trimethylpyrazine. These compounds share similar structural features and contribute to roasted and nutty sensory attributes, although specific odor profiles differ slightly based on their substitution patterns. For instance, dimethylpyrazines may evoke more toasted or baked notes, whereas diethyl substituted pyrazines often present deeper roasted or earthy nuances. Another related compound is 2-Ethyl-3-methylpyrazine, which also contributes roasted and nutty characteristics but may differ in volatility and perception threshold. Flavor formulators choose specific pyrazines based on the target sensory profile, taking into account how each interacts with other volatile compounds. While these compounds have similar roles in enhancing aroma, their sensory impacts and functional properties in complex food matrices can differ, informing how they are used in specific applications. In risk assessment and regulatory contexts, these related additives undergo similar evaluations by expert bodies that consider structure, exposure and toxicological data. The fact that multiple pyrazine derivatives are collectively assessed reflects their shared characteristics as naturally occurring or added aroma compounds. Comparing them highlights both their common utility in flavor science and the importance of nuanced selection based on desired sensory outcomes.
Common Food Applications Narrative
2,3-DIETHYL-5-METHYLPYRAZINE finds application in a broad range of food products where roasted, nutty or earthy sensory attributes are desired. In roasted coffee flavor profiles and coffee-containing foods, this compound contributes to the characteristic aroma that consumers associate with quality and depth. In nut-based products, such as those flavored to mimic roasted peanuts or hazelnuts, its presence can enhance authenticity and complexity. Meat products and savory snacks also benefit from its inclusion, where it contributes to roasted meat or grilled notes that enrich consumer experience. In bakery and cereal products, 2,3-DIETHYL-5-METHYLPYRAZINE supports toasted and baked sensory cues that amplify the overall flavor impact. It may be used in flavor systems for cookies, crackers, baked snacks and breakfast cereals to provide a fuller, more robust sensory impression. Additionally, it appears in savory seasonings and sauces where complexity and roasted nuances are part of the desired profile. Its use is not limited to a single category; rather, it spans products where nuanced aroma modulation improves consumer perception of taste and quality. The use of such flavoring agents reflects broader trends in consumer preference for rich and familiar sensory experiences. By carefully blending 2,3-DIETHYL-5-METHYLPYRAZINE with other aroma compounds, formulators can tailor flavor profiles that resonate with target audiences while maintaining consistency across production batches. Whether in sweet, savory or beverage applications, this ingredient plays a supporting role in shaping sensory narratives that align with product positioning and consumer expectations.
Explore familiar flavors
Explore ingredients and foods linked to this familiar flavor.
Flavor ideas
Coffee for baking and drinks
Espresso powder can bring a coffee note to baked desserts or a cup of homemade coffee.
Explore coffee ideasAffiliate disclosure: As an Amazon Associate I earn from qualifying purchases. This is at no additional cost to you.
Safety & Regulations
FDA
- Notes: Inclusion in US inventories does not in itself signify specific FDA approval; no explicit CFR entry found.
EFSA
- Notes: No EFSA specific numeric ADI found in available evaluations.
JECFA
- Year: 2001
- Adi Display: No safety concern at current intake levels when used as a flavouring agent
Comments
Please login to leave a comment.
No comments yet. Be the first to share!