CYCLOHEXYLMETHYL PYRAZINE

CAS: 28217-92-7 FLAVORING AGENT OR ADJUVANT

Cyclohexylmethyl pyrazine is a heterocyclic pyrazine derivative used as a flavoring agent with a characteristic green, nutty odor. It has been evaluated by international expert bodies for use in food flavoring.

What It Is

Cyclohexylmethyl pyrazine is a defined chemical compound belonging to the class of pyrazines, a family of heterocyclic aromatic organic compounds. Its structure features a pyrazine ring with a cyclohexylmethyl substituent, giving it the CAS Registry Number 28217-92-7 and the molecular formula C11H16N2. This compound is recognized in flavor science for its aroma properties, described as green, musty, and nutty in sensory evaluations. In many flavor databases it is listed with identifiers such as FEMA 3631 and JECFA Number 783, underscoring its classification as a flavoring agent that contributes to complex sensory profiles in prepared foods. The role of cyclohexylmethyl pyrazine as a flavoring agent is afforded by its ability to interact with human olfactory receptors in characteristic ways. Pyrazine derivatives broadly are known for imparting roasted, baked, earthy, and toasted notes to food products, and cyclohexylmethyl pyrazine shares these sensory properties. Because it is not a simple sugar or fat-derived flavor but instead a small heterocyclic aromatic compound, it functions at very low concentrations to modulate aroma and taste in combination with other flavor components. Flavor chemists study cyclohexylmethyl pyrazine and related compounds to understand how structural variations in heterocycles influence sensory perception. The compound’s odor characteristics and functional classification have made it a subject of regulatory evaluation by organizations responsible for food additive assessments, and it appears in flavoring inventories used by industry and regulatory bodies alike. Its presence in such inventories reflects both its technical function and the body of evidence supporting its sensory properties.

How It Is Made

The manufacture of cyclohexylmethyl pyrazine begins with basic organic chemistry building blocks that allow the construction of the pyrazine ring and the attachment of a cyclohexylmethyl side chain. Pyrazine rings can be formed via condensation reactions of appropriate diamines and aldehydes or related precursors under controlled conditions, and cyclohexylmethyl moieties are typically introduced using alkylation techniques tailored to ensure selective substitution on the ring. In general industrial practice, chemicals intended for use as flavoring agents are synthesized under Good Manufacturing Practice (GMP) conditions to produce a high degree of purity and to limit contaminants that could affect sensory quality or safety. Once synthesized, the crude product undergoes purification steps such as distillation, crystallization, or chromatographic separation to remove unreacted starting materials, side products, and solvents. The choice of purification method depends on the scale of production and the physical properties of the compound, such as boiling point, solubility, and thermal stability. Typical specifications for flavor chemicals require high purity—often above 97%—so that flavor profiles are consistent and free from off-notes. Manufacturers of cyclohexylmethyl pyrazine for flavor applications must also consider regulatory specifications where applicable. Purity standards may be established by international compendia or industry associations, and analytical methods such as gas chromatography with mass spectrometry (GC-MS) are used to verify composition and compliance. These steps help ensure that the flavoring agent is produced consistently with the quality expectations of food formulators and within the contours of regulatory assessments.

Why It Is Used In Food

Cyclohexylmethyl pyrazine is used in food primarily for its contribution to flavor complexity, particularly in applications where nutty, roasted, and green notes are desired. Pyrazine derivatives are among the volatile flavor compounds that human sensory systems associate with cooked and processed foods, especially those involving Maillard reaction products such as roasted nuts, coffee, cocoa, and baked goods. In this role, cyclohexylmethyl pyrazine can enhance or round out flavor profiles by adding depth and character that might otherwise be lacking if only simple volatile compounds were used. The use of cyclohexylmethyl pyrazine in food formulations is guided by its strong odor potency; even small amounts can have a perceptible impact on aroma. Because of this potency, food technologists add it in trace quantities to beverages, confectionery, and savory applications to achieve the desired sensory effect without overwhelming the overall flavor balance. Its versatility in combining with other flavor compounds allows formulators to tailor product taste experiences across a range of categories. Beyond sensory effects, flavoring agents such as cyclohexylmethyl pyrazine also play a role in consumer perception and acceptability. Well-balanced flavors can improve the palatability of products, support brand sensory signatures, and meet targeted taste profiles in competitive markets. While cyclohexylmethyl pyrazine itself does not contribute nutritional value, its role in shaping sensory experiences makes it valuable to food product development, particularly in sectors emphasizing artisan-like flavor notes or complex aroma bouquets.

Adi Example Calculation

To illustrate how safety considerations around flavoring agents differ from nutrient recommendations, consider a hypothetical calculation for a compound with a defined ADI. Suppose a flavoring agent has a numeric ADI of X mg per kilogram of body weight per day. For a 70‑kilogram adult, this would translate into X times 70 mg per day as the maximum amount considered safe over a lifetime. If an average food product contains Y mg of that flavor compound per serving, a consumer would need to eat Z servings before approaching the ADI, where Z is derived by dividing the total allowable daily intake by Y. For cyclohexylmethyl pyrazine, no numeric ADI has been set by expert committees because the evaluation concluded no safety concern at current intake levels based on typical use and exposure estimates. Therefore, rather than calculating against a numeric ADI, safety assessment relies on comparing estimated dietary exposure from all sources to benchmarks of toxicological concern derived from available data. If typical exposure is orders of magnitude below levels with any observed adverse effects in studies, regulators conclude that the compound’s use as a flavoring agent is unlikely to pose health risks under intended conditions of use. This conceptual framework underscores the difference between numeric threshold‑based risk assessment and qualitative determinations of safety at expected exposure levels.

Safety And Health Research

Safety and health research surrounding food flavoring agents such as cyclohexylmethyl pyrazine typically focuses on toxicological endpoints relevant to dietary exposure, including acute toxicity, genotoxicity, metabolism, and chronic effects. In the case of pyrazine derivatives, expert committees have reviewed available data to determine whether there are potential safety concerns associated with consumption at expected levels of intake in flavored foods. The Joint FAO/WHO Expert Committee on Food Additives performed a comprehensive review of a group of pyrazine flavoring agents and reported that no safety concern arises at current intake levels, based on available toxicological and exposure data. This conclusion is drawn from assessments of structural class, predicted metabolism, and estimated dietary exposure rather than controlled clinical studies, reflecting standard risk assessment practices for flavor compounds that are used in small quantities. In addition to international expert evaluations, safety profiles may be informed by studies of related pyrazine compounds, which often serve as surrogate data when specific studies for a given derivative are limited. Pyrazines in general have been evaluated for genotoxic potential, reproductive toxicity, and metabolic behavior, with most simple alkyl and substituted pyrazines showing low toxicity at dietary exposure levels. Because cyclohexylmethyl pyrazine is used at very low concentrations in food formulations, exposure assessments often indicate that total intake is well below thresholds of toxicological concern. While consumer interest in the safety of food additives remains high, it is important to note that flavoring agents such as cyclohexylmethyl pyrazine are subject to review by expert panels that apply established scientific protocols. These protocols integrate data from toxicology, exposure estimation, and chemical structure-activity relationships to assess risk. Ongoing research may refine our understanding of flavor compound safety, but current authoritative evaluations do not indicate adverse health effects from the intended use of cyclohexylmethyl pyrazine in food.

Regulatory Status Worldwide

The regulatory status of cyclohexylmethyl pyrazine reflects its evaluation by international expert bodies responsible for food safety assessments. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated this compound as part of a group of pyrazine derivatives and concluded that there is no safety concern at current levels of intake when used as a flavoring agent according to their report. This statement is based on expert review of available toxicological and exposure data compiled in their evaluation, including considerations of structural class and expected use levels in food. The evaluation year of the d JECFA assessment is recorded as 2001, and the conclusion emphasizes safety at current intake levels rather than specifying a numerical Acceptable Daily Intake (ADI). In the United States, while the compound may appear on inventory lists or in flavor industry references, specific inclusion in the Code of Federal Regulations as a generally recognized as safe (GRAS) substance is not directly codified under a precise CFR section. Regulatory recognition in the U.S. often stems from industry determinations or FEMA GRAS status, but without explicit CFR listing, formal approval status is null here. In the European Union, EFSA has considered pyrazine derivatives structurally related to cyclohexylmethyl pyrazine in flavoring group evaluations, generally agreeing with JECFA’s conclusion of no safety concern at estimated levels of intake. This harmonized view across major regulatory jurisdictions supports the compound’s continued use in food flavor applications under normal conditions of intended use. National regulatory frameworks in other countries may reference these evaluations or maintain their own standards for flavoring compounds, but the overarching international consensus is that cyclohexylmethyl pyrazine can be used without undue safety concern within accepted use levels.

Taste And Functional Properties

Cyclohexylmethyl pyrazine is notable among flavor compounds for its distinctive sensory properties. At low concentrations, it is typically described as imparting green, musty, and nutty odor notes, which can contribute to perceptions of roasted or toasted character in complex mixtures. Because human olfactory receptors are sensitive to the structural features of heterocyclic compounds, even minor changes in the substituent groups on a pyrazine ring can significantly affect the quality of the aroma perceived. The presence of the cyclohexylmethyl group in this compound confers a particular profile that complements other flavor-promoting agents. Functionally, like other volatile aroma compounds, cyclohexylmethyl pyrazine exhibits behavior influenced by volatility, solubility, and stability in food matrices. It has limited water solubility but is more soluble in lipid and alcohol phases, making it suitable for application in products like flavored oils, beverages with alcohol content, and emulsified systems. Its volatility means that it can contribute to both the aroma released during consumption and the headspace aroma that consumers perceive before tasting. Stability considerations are also important: although many pyrazine derivatives are relatively stable to heat and pH fluctuations encountered in typical food processing, formulators must understand how thermal treatments and storage conditions affect compound retention. In general, the compound’s thermal stability supports its use in baked goods and processed snacks where heat treatment is part of production. The sensory contributions of cyclohexylmethyl pyrazine complement other flavor-building ingredients and are part of the broader suite of tools that flavor chemists use to achieve specific taste and aroma goals.

Acceptable Daily Intake Explained

The concept of an Acceptable Daily Intake (ADI) is used by regulatory bodies and expert committees to describe the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. ADIs are usually expressed in terms of milligrams of substance per kilogram of body weight per day and are based on toxicological data with conservative safety factors applied. For many low‑level flavoring agents, including pyrazine derivatives, regulators may not assign a specific numeric ADI when evidence suggests no safety concern at current levels of intake and when typical exposure is far below thresholds of toxicological concern. In such cases, the determination of ‘no safety concern at current intake levels’ serves a role analogous to an ADI in guiding regulatory decisions. For cyclohexylmethyl pyrazine, expert evaluation by JECFA concluded that current intake levels expected from normal use in flavor applications do not raise safety concerns. This conclusion is based on a comprehensive review of available data rather than a specific numeric threshold, meaning that rather than a formal ADI value, the guidance communicates that estimated intakes under typical food use scenarios are considered safe. This approach reflects a broader regulatory practice in which certain compounds with low exposure and low toxicological potential are evaluated qualitatively rather than through assignment of numeric ADIs. Consumers may sometimes confuse the ADI with recommended daily intake values for nutrients, which is not correct. An ADI is a health‑based exposure guideline used in risk assessment to ensure safety, not a nutritional recommendation. When regulators state that there is no safety concern at current intake levels, it implies that typical exposure from flavored foods does not approach levels associated with toxicological effects in studies.

Comparison With Similar Additives

Cyclohexylmethyl pyrazine shares functional and sensory characteristics with other pyrazine derivatives used as flavoring agents, making it useful to compare its properties with similar compounds. For example, 2,3,5‑trimethylpyrazine is another pyrazine derivative with a toasted, nutty aroma that contributes to roasted and baked flavor profiles. Although both compounds provide nutty sensory notes, differences in substituent groups on the pyrazine ring influence their odor thresholds and character: methyl substitutions tend to yield sweeter, toasted notes, whereas the cyclohexylmethyl group in cyclohexylmethyl pyrazine contributes a more complex green and musty nuance in addition to nutty perceptions. This structural variation highlights how slight changes in chemical structure within the pyrazine family alter sensory effects while maintaining a core functional role in flavor construction. Another analogous compound is 2‑ethylpyrazine, which also contributes roasted and earthy notes to flavor systems. Compared with cyclohexylmethyl pyrazine, 2‑ethylpyrazine generally has a lighter roasted character and a lower molecular weight, which can affect volatility and interaction with other aroma compounds. Flavorists may choose between these compounds depending on the desired balance of intensity, volatility, and specific sensory cues. Similarly, compounds like 2‑isopropylpyrazine add earthy and green notes that can complement other flavor ingredients, yet differ from cyclohexylmethyl pyrazine in how they integrate into complex aroma matrices. From a regulatory perspective, many pyrazine derivatives undergo similar safety evaluations because they belong to a broader structural class of heterocyclic flavoring agents. Expert panels often assess groups of related compounds collectively, drawing on structure‑activity relationships and exposure data to determine whether use at typical levels raises health concerns. In these assessments, cyclohexylmethyl pyrazine and its peers are evaluated under frameworks that consider common metabolic pathways and toxicological profiles, supporting consistent regulatory treatment across related substances.

Common Food Applications Narrative

Cyclohexylmethyl pyrazine finds application across a range of food products where nuanced flavor profiles are desired. Because of its green, musty, and nutty odor notes, it often appears in flavor formulations for roasted snacks, baked goods, and confectionery products. In baked goods such as crackers, artisan breads, and breakfast cereals, trace amounts of this compound can help reinforce the perception of freshly toasted or roasted grain notes that are critical to consumer enjoyment. Flavorists may incorporate cyclohexylmethyl pyrazine into complex flavor blends that also include other pyrazines, aldehydes, and ketones tailored to mimic the traditional sensory cues associated with home-baked or slow-roasted foods. In the confectionery category, subtle roasted and toasted notes can make a significant difference in products like nougat, toffee, and filled chocolates. Here, cyclohexylmethyl pyrazine’s contributions synergize with sweet and creamy base notes to enrich the overall sensory experience. For beverages, particularly specialty coffee or cocoa-flavored drinks, the compound’s profile supports the layered aromatic complexity that consumers expect from premium products. Savory applications also benefit from the controlled use of pyrazines like cyclohexylmethyl pyrazine. Snack foods with umami-rich profiles—such as seasoned chips, flavored nuts, and meat analogs—often leverage these volatile compounds to enhance depth and richness. Even in processed sauces and condiments, where roasted or nutty undertones can elevate overall palatability, cyclohexylmethyl pyrazine serves as one component among many in carefully calibrated flavor systems. Its versatile sensory attributes help product developers achieve targeted consumer taste profiles without relying solely on more dominant salty or sweet cues.

Safety & Regulations

FDA

  • Notes: No specific CFR listing could be confirmed with authoritative deep links

EFSA

  • Notes: EFSA evaluation of structurally related pyrazine derivatives concluded no safety concern at current intake levels
  • Approved: True

JECFA

  • Year: 2001
  • Adi Display: No safety concern at current intake levels when used as a flavouring agent

Sources

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