M-CRESOL

CAS: 108-39-4 FLAVORING AGENT OR ADJUVANT

M-Cresol is a chemical compound with CAS number 108-39-4 used as a flavoring agent or adjuvant in food applications. It is evaluated by international expert committees for safety as a flavouring substance when used at typical intake levels. JECFA evaluated it and found no safety concern at current levels of intake when used as a flavouring agent.

What It Is

M-Cresol, identified by the CAS number 108-39-4, is a substituted phenolic compound with the systematic name 3-methylphenol and a class of substances known as cresols. It is a clear to yellowish liquid with a characteristically phenolic odor. As a flavouring agent or adjuvant in food, it falls within the broader category of flavouring substances that can contribute specific sensory qualities such as phenolic, smoky notes to complex food matrices. Other names associated with this compound reflect its chemical structure and history of use in chemical literature, including 3-methylphenol, meta-cresol, and m-cresylic acid. M-Cresol is part of a larger group of phenolic compounds that are derived from aromatic hydrocarbons with a methyl substituent and a hydroxyl group, giving it both hydrophobic and hydrophilic properties. These structural features influence its behavior in formulations where it is used as a flavouring agent. In regulatory food additive contexts, M-Cresol is evaluated as a flavouring agent or adjuvant, indicating that its primary role in food is to modify or enhance flavor profiles rather than to serve as a nutrient or preservative. According to evaluations by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), M-Cresol has been assessed for safety when used as a flavouring substance, and expert summaries indicate that at typical intake levels from food use there is no safety concern. This assessment reflects an international scientific consensus on the compound's safety for its designated technical function, based on available toxicity and exposure data. The multifunctional profile of M-Cresol underscores its relevance in food science and flavour formulation, where it is considered among other phenolic derivatives for specific sensory impacts.

How It Is Made

The production of M-Cresol generally involves industrial chemical synthesis processes that build on aromatic chemistry principles. Historically, cresols including M-Cresol were recovered in small quantities from by-products of coal tar and petroleum refining, but modern industrial synthesis routes have evolved to provide more efficient and scalable approaches. One common method involves the alkylation of benzene derivatives followed by controlled oxidation and separation steps to yield the 3-methylphenol isomer with high purity. In some processes, feedstocks such as toluene are first sulfonated and then reacted under basic conditions to form cresol isomers, with subsequent distillation and purification techniques used to isolate the m-isomer. These steps are carried out under controlled temperature and pressure conditions to maximize yield and selectivity for M-Cresol. Because the structural isomers of cresol have very similar boiling points, fractional distillation and advanced chromatographic methods are often used in the final separation and refinement stages. The result is a product that meets defined purity specifications suitable for use in food flavoring applications, industrial intermediates, and other technical uses. In industrial practice, synthesis is typically followed by quality control procedures, including spectroscopic analysis and chemical assays, to verify identity and purity. The production environment must also incorporate safety measures to manage the risks associated with handling phenolic compounds, which can be toxic and corrosive at higher concentrations. These safety precautions include proper ventilation, protective equipment, and adherence to regulatory guidelines for safe manufacturing practices. The production scale and methods may vary by manufacturer, but the overarching approach combines organic synthesis techniques with rigorous purification to provide material appropriate for flavouring use, when permitted by regulatory authorities and expert evaluations.

Why It Is Used In Food

M-Cresol is used in food primarily for its role as a flavouring agent or adjuvant, contributing specific phenolic aromatic characteristics to a variety of formulations. Flavoring agents are incorporated into food products to provide desired sensory experiences that align with consumer expectations for taste and aroma. In complex food matrices, phenolic derivatives such as M-Cresol can impart subtle smoky, spicy, or roasted notes that complement other flavour components. Its inclusion in flavour blends allows food scientists to fine-tune sensory attributes, especially in applications seeking to mimic traditional cooking profiles or enhance the perception of ‘meaty’ or roasted characteristics. While not a nutrient, the technical function of M-Cresol as a flavouring agent means that it interacts with human olfactory and gustatory receptors to create specific sensory impressions. In flavor chemistry, small phenolic molecules are valued for their ability to modify and enhance existing flavor profiles without overwhelming the base ingredient. This can be particularly useful in savory products, beverage systems that aim for complexity, and specialty flavour blends where nuanced aromatic notes are desirable. Regulatory evaluations by bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) provide a scientific basis for understanding how substances like M-Cresol behave in food contexts and what safety considerations are pertinent. In case of M-Cresol, a JECFA evaluation indicated no safety concern at typical intake levels for flavouring use, which supports its continued study and application in flavor science. The use of such compounds is carefully considered by flavorists and product developers, with attention to concentration, formulation compatibility, and overall sensory impact. Ultimately, M-Cresol’s role in food reflects broader principles of food science where targeted chemical compounds are selected to achieve specific flavour characteristics in harmony with regulatory safety assessments.

Adi Example Calculation

To illustrate how ADI concepts are applied, consider a hypothetical scenario where a substance with an established ADI of 1 mg per kilogram of body weight per day is consumed by an individual weighing 70 kilograms. If this were the case for a hypothetical additive, the calculation would involve multiplying the ADI by body weight, yielding an illustrative safe intake level of 70 milligrams per day. This example is purely illustrative and does not reflect an actual ADI for M-Cresol, as JECFA’s evaluation did not identify a numerical ADI for routine flavouring use. The purpose of such an example is to demonstrate how regulators and risk assessors translate ADI values into real-world exposure considerations for individuals based on body weight. In practice, actual exposure from flavouring use is typically much lower than such illustrative ADI-based allowances, reflecting the small concentrations used in food formulations and the conservative nature of safety assessments. By understanding the framework behind ADI calculations, stakeholders can better interpret regulatory assessments and how they inform safe use guidelines in food science contexts.

Safety And Health Research

Safety and health research on M-Cresol encompasses toxicological studies and regulatory evaluations that assess how the compound interacts with biological systems and what levels of exposure may be considered acceptable in food contexts. Toxicological data from agencies such as the U.S. Environmental Protection Agency (EPA) indicate that subchronic toxicity studies in laboratory animals identify points of departure for systemic effects, with higher doses producing observable changes in body weight and other parameters, whereas low-level exposures did not result in significant adverse effects in controlled studies. These findings help regulators understand dose-response relationships and how safety margins can be established for human exposure. In addition to such laboratory research, expert panels including those from JECFA review available data on metabolism, animal studies, and exposure patterns to determine whether a compound poses safety concerns at intake levels typical of flavouring use. For M-Cresol, the JECFA evaluation concluded that there was no safety concern at current intake levels when used as a flavouring agent, which reflects a consensus that typical exposures from food use do not present a risk based on the reviewed evidence. It is important to recognize that toxicological assessments consider many factors including absorption, distribution, metabolism, excretion, and potential for chronic effects, and that safety conclusions are drawn within the context of typical dietary exposure rather than high-dose laboratory conditions. Regulatory and scientific bodies continue to monitor emerging evidence related to chemical compounds used in food flavouring, updating evaluations as new data become available. This ongoing assessment ensures that safety considerations remain current with scientific understanding and consumption patterns. Health research in this area informs risk management decisions and contributes to frameworks that balance the functional utility of flavouring agents with consumer protection.

Regulatory Status Worldwide

The regulatory status of M-Cresol as a flavouring agent or adjuvant varies by jurisdiction and is shaped by scientific evaluations and food additive inventories maintained by regulatory authorities. In international food safety governance, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated M-Cresol for use as a flavouring substance. In a summary of evaluations, JECFA noted that there is no safety concern at current levels of intake when M-Cresol is used as a flavouring agent, which provides an expert scientific basis for understanding its safety profile in food contexts. However, this evaluation does not automatically translate into specific numerical acceptable daily intake (ADI) values because M-Cresol’s use as a flavouring agent is considered safe at typical exposure levels rather than requiring a fixed numerical ADI. In the United States, the Food and Drug Administration (FDA) maintains the Substances Added to Food inventory (formerly EAFUS), which includes substances that have been evaluated by the Flavor and Extract Manufacturers Association (FEMA) and JECFA for flavouring use. Inclusion in this inventory reflects that M-Cresol is recognized by expert panels for use as a flavouring agent, but it does not necessarily equate to an explicit FDA regulatory approval with defined use conditions in the Code of Federal Regulations. Therefore, while M-Cresol appears in inventories of flavouring substances and has been subject to expert safety evaluation, the specific regulatory allowances for its use in food products depend on jurisdictional frameworks and interpretation of safety data by local authorities. Within the European Union and other regions, flavouring substances are subject to separate regulatory reviews and lists that define permitted flavouring agents and conditions of use. The absence of a widely recognized E-number specific to M-Cresol suggests that formal numerical identification as a food additive may not be established in certain markets. Therefore, manufacturers and formulators must consult relevant national and regional food additive regulations to determine whether M-Cresol can be used in specific food categories and under what conditions. This regulatory landscape underscores the importance of aligning flavour formulation practices with current food safety assessments and legal frameworks in each market.

Taste And Functional Properties

M-Cresol exhibits sensory characteristics that are typical of small phenolic compounds, with descriptors often noting phenolic, smoky, and slightly medicinal aromatic qualities. These sensory properties derive from its chemical structure, which includes an aromatic ring substituted with a methyl group and a hydroxyl functional group. The presence of the hydroxyl group on the aromatic ring influences both its volatility and solubility properties, making it moderately volatile and capable of contributing to aroma perception at low concentrations. In practical flavouring applications, the taste and olfactory profile of M-Cresol is not overwhelmingly sweet or fruity but rather contributes to depth and complexity in savoury and roasted notes, which can be desirable in certain flavour blends. Functionally, M-Cresol’s behaviour in food systems is influenced by its moderate solubility in water and higher solubility in organic phases. It is slightly soluble in water at room temperature and more soluble in ethanol and other organic solvents, which can affect how it is incorporated into liquid or semi-solid food products. The compound’s stability under various processing conditions, such as heating and pH changes, may also affect its functional performance when used as a flavouring agent. For example, processing at elevated temperatures can affect the intensity of its sensory contribution, and formulation scientists must account for potential interactions with other ingredients that could alter its perception. Sensory scientists typically test such compounds in model systems to understand how they contribute to overall flavour profiles, often in combination with other phenolic derivatives and aromatic components. The perceptual threshold of M-Cresol is an important consideration; at low concentrations, it may add complexity without dominating the flavour, but at higher levels it could introduce off-notes or excessive phenolic character. These functional and sensory properties underscore the importance of precise formulation and sensory evaluation when including M-Cresol in food flavour applications.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a scientific construct used by regulatory agencies to describe the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on toxicological data and safety factors. For many flavouring agents and food additives, regulators or expert committees such as JECFA establish ADIs after reviewing available studies on toxicity, metabolism, and exposure. In the case of M-Cresol, expert evaluation by JECFA noted that at levels of intake typical of its use as a flavouring agent there is no safety concern, which implies that a numerical ADI was not deemed necessary for routine flavouring use because exposures are expected to be well below levels associated with adverse effects. The concept of an ADI helps contextualize safety assessments by providing a reference level that reflects conservative estimates of safe exposure, taking into account uncertainties in extrapolating from animal studies to humans and variations within human populations. It is important to emphasize that an ADI is not a recommended target for consumption but rather a boundary that regulators use to ensure that typical dietary exposures remain within safe limits. For consumers and formulators alike, understanding the role of an ADI and how it relates to safety assessments provides insight into how scientific data translate into regulatory practice. In instances where a compound has been evaluated and found not to require a numerical ADI at typical intake levels, this indicates confidence that exposures from approved uses are unlikely to pose health concerns.

Comparison With Similar Additives

M-Cresol belongs to a broader class of phenolic flavouring compounds that share structural features and sensory properties. Phenolic derivatives such as o-cresol and p-cresol are positional isomers with methyl and hydroxyl groups on an aromatic ring, and they contribute distinct aromatic notes that may be used in flavour formulation. Compared to these isomers, M-Cresol’s specific sensory profile is characterized by phenolic, smoky, and slightly medicinal aromatic qualities. Other flavouring agents in the phenolic class include compounds such as guaiacol and eugenol, which also deliver complex sensory impressions like smoky or spicy notes but differ in their chemical substituents and regulatory evaluations. For instance, guaiacol is often associated with smoky or roasted sensory characteristics and might be selected for beverage or savoury applications where such notes are desirable. In contrast, eugenol’s spicy and clove-like aroma lends itself to bakery and spice blend applications. These compounds illustrate how small differences in molecular structure can lead to significant differences in sensory impact and functional behavior in food systems. Regulators and food scientists evaluate each compound on its own safety and functional profile, considering factors such as typical exposure levels, sensory thresholds, and technological purpose. Comparing M-Cresol with other phenolic flavouring agents highlights the diversity of sensory tools available to flavourists and the importance of aligning sensory objectives with safety and regulatory frameworks in food product development.

Common Food Applications Narrative

In food science and technology, flavouring agents play an essential role in shaping the sensory experiences that consumers expect when they eat or drink a product. M-Cresol, as a flavouring agent or adjuvant, is considered within this context of enhancing or modifying flavour profiles to achieve particular aromatic qualities. While not used universally across all food categories, phenolic flavouring compounds are selected for their ability to contribute complex and nuanced sensory notes that are not easily replicated by simpler sugar or fruit-derived flavour molecules. Food applications where M-Cresol may be studied and, if permitted by regulatory frameworks, utilized in flavour blends include savoury sauces, broth concentrates, and speciality beverage systems. In savoury products, for instance, the subtle smoky or roasted notes that phenolic derivatives impart can enhance the overall savouriness and depth of flavour when balanced with other seasoning components. This can be particularly useful in vegetarian or vegan formulations seeking to approximate the aroma complexity associated with traditional roasted meats or broths. In beverage applications, low levels of certain phenolic flavouring substances may be used in conjunction with other aromatic compounds to create sophisticated sensory profiles in craft sodas, herbal infusions, or botanical blends. In baked goods, small phenolic flavouring agents can contribute to the perception of toasted or caramelized notes that complement the base grain flavours and other sweet or nutty elements. These applications reflect a broader trend in food innovation where flavour complexity and differentiation are paramount in competitive markets. The use of M-Cresol in such contexts is informed by sensory science, formulation expertise, and regulatory evaluations that consider safety at typical intake levels. Flavorists work with a palette of aromatic compounds to create balanced blends that deliver desired sensory impacts without overwhelming the base food system. Consumers encounter the results of such work in products that offer nuanced and memorable flavour experiences, with each ingredient selected for its contribution to the overall sensory design.

Safety & Regulations

FDA

  • Notes: Inclusion in the FDA Substances Added to Food inventory does not indicate formal approval; use must be verified against specific regulations.

EFSA

  • Notes: No specific EFSA E number or numerical ADI identified from available authoritative sources.

JECFA

  • Notes: JECFA evaluation found no safety concern at current intake levels but did not specify a numerical ADI on the available evaluation.
  • Ins Number: 692

Sources

Comments

No comments yet. Be the first to share!