1-BUTANETHIOL

CAS: 109-79-5 FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

1-BUTANETHIOL is a sulfur‑containing organic compound used primarily as a flavouring agent and flavor enhancer. It has been evaluated by international expert bodies for its specification as a flavouring substance and is listed in flavouring specifications databases. Regulatory bodies in various jurisdictions may treat it as a flavouring subject to appropriate safety evaluation and good manufacturing practices.

What It Is

1-BUTANETHIOL is a defined organic compound with the chemical registry number CAS 109-79-5 that belongs to the class of aliphatic thiols. As a flavouring agent and flavor enhancer, this substance is characterized by its strong aroma and is used in food formulations to impart or modify sensory profiles, particularly savory notes. It is recognized in flavouring specifications and has identifiers such as a JECFA number (511) and a FEMA number (3478), indicating its inclusion in international flavouring evaluation systems. Although not assigned a specific international numbering system (INS) code or an E-number in the European Union, it has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives for use as a flavouring agent when present at typical intake levels. As an organosulfur compound, 1-BUTANETHIOL has distinct sensory characteristics that are leveraged in very low concentrations to influence the taste and aroma of complex food matrices. The presence of the thiol group confers a potent olfactory impact, which is why only minute quantities are required to achieve the desired sensory effect in formulations. The compound also goes by other chemical names reflective of its structure, such as butyl mercaptan and butylthiol, which are found in chemical and flavouring specifications. Due to its classification as a flavouring agent rather than a nutrient or preservative, the regulatory and safety discussions around 1-BUTANETHIOL focus on its sensory role in food, the conditions under which it can be used, and the safety evaluations conducted by expert bodies. This classification places it within the broader group of substances that modify or enhance sensory properties in food products.

How It Is Made

The production of 1-BUTANETHIOL involves established organic synthesis pathways that are common for thiol compounds. Industrial and laboratory methods typically center on reactions that introduce a sulfhydryl group into a four‑carbon chain. One approach involves the nucleophilic substitution of an alkyl halide, such as 1‑bromobutane, with a sulfhydryl source to yield the thiol product. Another industrial route can involve the addition of hydrogen sulfide to an alkene or related precursor under controlled conditions. These processes yield a technical grade material that then undergoes purification and quality control to meet flavouring specifications. Purity considerations are central in the manufacturing process because the sensory potency of 1-BUTANETHIOL means that impurities can have an exaggerated impact on final food applications. Common purification steps include distillation and chromatographic methods to reduce byproducts and ensure compliance with analytical identity tests. Although specific regulatory specifications for purity are defined in specialised databases, the manufacturing focus remains on achieving a product suitable for incorporation into flavour formulations used by the food industry. From a regulatory and quality perspective, producers of 1-BUTANETHIOL intended for use in food must maintain stringent documentation and batch records to demonstrate that the material meets appropriate food‑grade criteria. This includes analytical characterization, identification of impurities, and adherence to good manufacturing practices. The synthesis and purification techniques align with industry norms for flavouring substances that are evaluated internationally for safety and specification.

Why It Is Used In Food

1-BUTANETHIOL is used in food primarily because of its ability to enhance and modify flavor profiles at very low concentrations. As a flavoring agent with a distinctive sulfurous aroma, it contributes to savory and complex sensory notes that may be desirable in certain products such as savory snacks, seasoning blends, or other foodstuffs where specific aroma characteristics are sought by manufacturers. Its potency means that only trace levels are needed to achieve significant sensory impact, which aligns with the general use pattern of many flavouring substances. The function of 1-BUTANETHIOL in food formulations is to provide or amplify specific odor and taste qualities that contribute to overall flavor perception. Flavor chemists and product developers select compounds like this to create balanced and targeted sensory profiles that meet consumer expectations for aroma and flavor intensity. Because the human olfactory system is highly sensitive to thiol compounds, 1-BUTANETHIOL is effective even at very low use levels, which helps manufacturers manage formulation costs while delivering the desired effect. Moreover, 1-BUTANETHIOL and similar compounds are often used in combination with other flavouring substances to create complex flavour profiles that cannot be achieved with a single ingredient. Its role as an adjunct in flavour systems highlights the nuanced approach taken by food scientists in designing flavors that are appealing and consistent across batches. The use of such flavouring agents is always guided by safety evaluations conducted by international expert bodies and by adherence to good manufacturing practices to ensure that the substance is used appropriately in food applications.

Adi Example Calculation

To illustrate how an acceptable daily intake (ADI) framework might be applied in a hypothetical scenario, consider a compound for which a numeric ADI has been established. If an expert body determined an ADI of X milligrams per kilogram of body weight per day, a person weighing 70 kilograms would have a theoretical lifetime exposure threshold of 70 times X mg per day under that framework. For example, if the ADI were 0.5 mg/kg body weight per day, the corresponding threshold for a 70 kg adult would be 35 mg per day. In contrast, typical use levels for flavouring agents like 1-BUTANETHIOL are so low that actual dietary exposure estimates are orders of magnitude lower than such hypothetical thresholds when the compound is used in flavour systems. It is important to emphasize that the ADI framework is designed for regulatory and safety assessment contexts rather than individual dietary planning. The example calculation above is illustrative of how numeric ADIs are scaled by body weight when they are assigned by expert committees. Because 1-BUTANETHIOL has been evaluated by international expert bodies with a qualitative conclusion that there is no safety concern at current intake levels, no numeric ADI has been specified for it, and actual exposures from use as a flavouring agent remain well below levels associated with toxicological concern in experimental data. Understanding ADI calculations in this way helps clarify why some flavouring agents have numeric ADIs while others are addressed through qualitative safety conclusions. In both cases, the overarching goal is to ensure that consumers are not exposed to levels of a substance that could pose a health risk over a lifetime of consumption. This regulatory approach supports the safe use of flavouring substances when they are incorporated into food products according to good manufacturing practices and within typical use patterns.

Safety And Health Research

Safety assessments for flavouring agents like 1-BUTANETHIOL focus on toxicological endpoints and estimated exposure levels from typical use in food. International expert bodies such as JECFA examine available toxicology data, structural analog information, and human exposure patterns when evaluating whether there is a reasonable certainty of no harm under intended conditions of use. The conclusion that there is no safety concern at typical intake levels reflects the committee’s expert review of such evidence. This approach recognizes that flavouring substances are usually consumed in very small amounts and that safety evaluations emphasize margins between typical exposure and levels associated with adverse effects in experimental systems. Regulatory safety research does not typically focus on acute high-dose effects in isolation but rather integrates multiple lines of evidence, including studies in laboratory animals, metabolic data, and comparative analyses across structurally related compounds. These data help inform risk characterization and guide expert committees in determining whether use at typical levels raises concerns for consumers. The lack of a specified numerical ADI for 1-BUTANETHIOL in authoritative evaluations indicates that conventional exposure scenarios are not expected to approach thresholds associated with toxicological risk when the compound is used as a flavouring agent. In addition to formal evaluations by expert committees, manufacturers and flavour ingredient suppliers may conduct their own internal safety and sensory studies to support product development and regulatory compliance. These activities contribute to a body of evidence that informs both internal risk assessments and external regulatory submissions. Overall, the scientific basis for safety evaluations of flavouring agents emphasizes conservative exposure estimates, established toxicological principles, and the context of typical food use patterns rather than specific therapeutic or physiological effects.

Regulatory Status Worldwide

The regulatory status of 1-BUTANETHIOL varies by jurisdiction and depends on how authorities classify flavoring substances within their food additive frameworks. Internationally, 1-BUTANETHIOL has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), which concluded that there is no safety concern at current levels of intake when used as a flavouring agent, indicating that existing use patterns are considered acceptable within expert evaluations. This conclusion reflects the assessment of safety data and typical intake exposures for such flavouring substances rather than a specific numeric acceptable daily intake value. In the United States, substances used to impart flavor to food may fall under the category of flavouring agents with Generally Recognized As Safe (GRAS) status or may require regulatory review if they are considered food additives that affect food characteristics. The FDA’s inventory systems and guidance documents outline how flavouring substances are evaluated and how manufacturers demonstrate compliance with applicable safety and labelling requirements. Inclusion in inventories such as the Substances Added to Food list provides a reference point for potential use in food, although it does not by itself constitute an explicit FDA approval. European Union regulatory processes involve risk assessment and authorization frameworks for flavouring substances. While many compounds receive E-numbers when approved for use as food additives, not all flavouring agents are assigned specific E-numbers. The regulatory framework administered by the European Food Safety Authority (EFSA) and the European Commission requires that flavouring substances be evaluated and included on authorized lists if they are to be used in food within the EU. The absence of a specific E-number for 1-BUTANETHIOL in publicly available EU databases indicates that its use and status must be interpreted within the broader context of EU flavouring regulations and good manufacturing practices.

Taste And Functional Properties

The sensory characteristics of 1-BUTANETHIOL are defined by its distinct thiol functional group, which is associated with strong sulfur‑like odors. At low concentrations, this compound can contribute savory or roasted notes that are useful in enhancing certain flavor profiles in food products. However, due to its potent aroma, careful formulation work is needed to ensure that the sensory impact is balanced and does not overwhelm the overall flavor of the final product. The effectiveness of 1-BUTANETHIOL in this context reflects the sensitivity of the human olfactory system to sulfur containing molecules. From a functional perspective, 1-BUTANETHIOL exhibits properties typical of small organosulfur molecules including moderate volatility and low water solubility. These properties influence how it behaves in food systems, particularly in emulsions, dry seasonings, and other complex matrices where distribution and release of volatile compounds affect sensory perception. Its solubility in different media and its volatility profile are factored into formulation decisions to achieve the intended aroma release during consumption or preparation. In addition to sensory contributions, 1-BUTANETHIOL does not serve technological functions such as preservation or texturizing; its role is exclusively related to flavor. This distinct role means that product developers consider both its sensory contribution and its interaction with other flavouring agents when designing formulations. Its performance in a range of pH environments and in the presence of fats or proteins is understood in general terms by flavour chemists, but specific application conditions are tailored on a case‑by‑case basis to deliver consistent sensory outcomes.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory concept that represents the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, as determined by expert evaluations of toxicological data and safety factors. For some food additives, regulatory bodies assign a numeric ADI value expressed in milligrams per kilogram of body weight per day. This numeric value is derived from toxicology studies, usually in laboratory animals, and incorporates safety margins to account for uncertainties. In the case of 1-BUTANETHIOL, authoritative evaluations have concluded that there is no safety concern at current intake levels when used as a flavouring agent, and a numeric ADI was not specifically established. This reflects the assessment that typical exposures from dietary use are very low and do not approach levels associated with adverse outcomes in relevant studies. The concept of ADI helps regulators manage the use of additives by providing a benchmark for safety assessments and comparisons across different substances. It is important to understand that ADIs are not recommendations for individual consumption but rather safety thresholds that inform regulatory decisions and permissible use conditions. For flavouring agents consumed at trace levels, the ADI process may result in qualitative conclusions about safety rather than specific numeric limits when exposure assessments indicate that use levels fall well below any doses of toxicological concern. Consumers and manufacturers benefit from the ADI framework because it provides a structured method for interpreting toxicological data and exposure estimates. In practice, this means that when international expert evaluations conclude that there is no safety concern at typical intake levels for a flavouring agent like 1-BUTANETHIOL, regulatory authorities consider that the substance can be used in food within good manufacturing practice parameters. This approach underscores the role of ADI and similar safety assessment outcomes in ensuring that food ingredients do not pose appreciable risk under customary consumption patterns.

Comparison With Similar Additives

Flavouring agents such as 1-BUTANETHIOL are part of a broader class of compounds used to impart or modify sensory characteristics in food. When compared with other flavouring substances, differences in sensory profile, potency, and typical use levels are notable. For example, sulfur‑containing thiols may exhibit very strong aroma characteristics even at trace concentrations, which is distinct from esters or ketones that often contribute fruity or sweet notes. This means formulation strategies differ across classes of flavouring agents: highly potent thiols require careful dilution and blending to achieve desired effects without overwhelming other sensory components. In contrast, other common flavouring agents such as lactones or aldehydes may be used at higher use levels to provide broad aromatic notes like creamy or citrus nuances. These differences illustrate the variety of chemical structures and sensory effects encompassed by the category of flavouring substances. More traditional flavour enhancers, like glutamates, function by modulating taste receptor perception rather than providing a specific aroma, and their regulatory status and permitted use levels reflect different mechanisms of action. Product developers often combine multiple flavouring agents to create balanced and appealing profiles. Understanding how 1-BUTANETHIOL interacts with other flavour components helps formulation scientists achieve complex flavour outcomes. Although its sensory impact is significant, its use within a broader flavour system highlights the collaborative role between chemical properties, sensory science, and regulatory frameworks in delivering safe and desirable food products.

Common Food Applications Narrative

1-BUTANETHIOL finds its place in food applications where complex, savory, or roasted sensory notes are desirable in finished products. Although not used as a primary ingredient due to its strong sensory potency, this flavouring agent is selected by food scientists and formulation experts to enhance the overall aroma and flavor profile of products such as savory snacks, seasoning blends, meat analogues, and other foods where nuanced sensory characteristics are important. Its role is usually as one part of a broader flavour formulation rather than as a standalone additive. In typical food applications, 1-BUTANETHIOL is blended with other flavouring substances to create a targeted impression that aligns with consumer expectations for particular products. For example, in savory snack seasonings, trace amounts of highly potent flavouring agents like 1-BUTANETHIOL contribute specific top notes that complement broader flavor themes such as roasted, grilled, or umami characteristics. The use of this compound is always carefully calibrated by flavourists to avoid overpowering the desired profile and to ensure that the product delivers a consistent sensory experience. Manufacturers rely on comprehensive flavour libraries and sensory evaluation techniques when working with substances like 1-BUTANETHIOL. Its inclusion in flavour systems is guided by empirical data from sensory panels and instrument analysis that help optimize levels for each application. Because the compound’s sensory impact is strong, it typically appears in products that require sophisticated flavour engineering, where subtle adjustments can significantly influence the overall appeal of the food. Across diverse product categories, its use is informed by both the technical attributes of the compound and the sensory objectives of product developers.

Safety & Regulations

FDA

  • Notes: Specific FDA food additive approval for 1-BUTANETHIOL was not found in d regulatory listings; use status depends on demonstration of safety and GRAS or petition pathways.

EFSA

  • Notes: No specific EFSA E-number or numeric ADI could be verified from authoritative EU lists for this substance.

JECFA

  • Notes: JECFA qualitative safety conclusion provided; numeric ADI and evaluation year not explicitly shown on the d entry.
  • Adi Display: No safety concern at current levels of intake when used as a flavouring agent

Sources

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