CYCLOPENTANETHIOL

CAS: 1679-07-8 FLAVORING AGENT OR ADJUVANT

CYCLOPENTANETHIOL (CAS 1679-07-8) is an organosulfur compound used as a synthetic flavoring agent or adjuvant, with an alliaceous, savory odor and flavor profile.

What It Is

CYCLOPENTANETHIOL is a sulfur‑containing organic compound belonging to the class of alkylthiols, characterized by a five‑membered carbon ring with a thiol (sulfhydryl) group attached. The presence of the thiol functional group confers characteristic sensory properties, including alliaceous or savory flavor notes reminiscent of onion, garlic, or other vegetables. It has a CAS Registry Number of 1679‑07‑8 and is known under other synonyms such as CYCLOPENTYL MERCAPTAN, MERCAPTOCYCLOPENTANE, and CYCLOPENTYLTHIOL. As a technical function in food, it is categorized as a FLAVORING AGENT OR ADJUVANT, meaning it is used to contribute to or enhance the flavor of foods. Organosulfur compounds like this are a recognized structural group within flavoring chemistry due to their potent sensory attributes when used at low concentrations. The compound is listed in flavoring and chemical reference databases and is recognized for its sensory role in formulations. In flavor chemistry contexts, thiol‑containing molecules often have very low odor thresholds, making them impactful even at trace levels. Although these materials are potent odorants in perfumery and flavor applications, they are handled with care due to safety considerations inherent to volatile sulfur compounds. The technical classification as a flavoring agent or adjuvant aligns with its use in food science to provide specific savory or complex flavor impressions that other more common flavoring agents might not achieve. CYCLOPENTANETHIOL is part of broader groups of sulfur‑containing organics that have been subject to evaluation by expert panels and organizations interested in flavoring ingredients. Its identification numbers and chemical attributes, including molecular weight and structure, are catalogued in primary chemical databases. Establishing a clear understanding of what this compound is helps food scientists, flavorists, and regulatory professionals communicate consistently about its role in food systems.

How It Is Made

The production of CYCLOPENTANETHIOL typically involves synthetic organic chemistry processes that introduce a thiol group onto a cyclopentane backbone. Organic thiol synthesis often utilizes precursors such as cyclopentyl halides (for example cyclopentyl bromide) which can be reacted with sources of sulfhydryl ions under controlled conditions to substitute a halogen atom with a thiol group. Alternative routes might involve the transformation of cyclopentanone derivatives where sulfur donors such as hydrogen sulfide or other sulfur reagents effect nucleophilic substitution to yield the thiol. These reactions are conducted by trained chemists in controlled industrial or laboratory settings to achieve the desired product with an acceptable degree of purity. Commercial production prioritizes purity and consistency, as flavor applications require precise sensory impact at low concentrations. Analytical specifications, such as assay purity, refractive index, and boiling point ranges, are established for quality control. For food ingredient applications, manufacturers often produce material that meets defined chemical specifications, ensuring the absence of impurities that could affect taste or safety. Operations that synthesize such thiols implement hazard controls as these compounds can be flammable and may emit sulfur oxides if heated, requiring proper industrial hygiene practices. In practice, large‑scale synthesis balances yield with functional quality. As with many flavoring agents, multiple synthetic routes may exist, and choice of process can depend on cost, availability of starting materials, and environmental considerations. The key insight is that CYCLOPENTANETHIOL is not derived from a single natural source at scale but is instead a manufactured compound whose production is governed by standard practices in organic sulfur chemistry.

Why It Is Used In Food

CYCLOPENTANETHIOL is used in food primarily for its ability to modulate and enhance savory flavor profiles. Flavoring agents or adjuvants are added to food formulations to achieve specific sensory outcomes that contribute to the overall taste experience. In the case of organosulfur compounds such as this one, the unique alliaceous character complements savory, meaty, or vegetable‑like notes in food, making it valuable in applications where such complexity is desired. Although individual flavor compounds are often used at very low concentrations due to their potency, they play a crucial role in formulating balanced and interesting flavors. In practice, this compound might appear in flavor blends designed for processed foods that aim to replicate or augment the taste of natural ingredients like onion, garlic, or other aromatic vegetables. Such flavoring agents help food manufacturers achieve consistent taste profiles in products where natural ingredients alone may not provide sufficient intensity or stability. Furthermore, in combination with other flavoring components, CYCLOPENTANETHIOL can contribute to depth and richness that enhances consumer perception of quality and satisfaction. The concept of a flavor adjuvant indicates that the compound may not be intended as a primary flavor note on its own but rather as a supporting component that elevates other flavors. Its inclusion is based on sensory evaluation and food science research, where flavorists determine optimal concentrations that deliver desired effects without overpowering the overall flavor profile. This functional role underscores the importance of precision in formulation, especially for modern processed foods where uniform taste is expected across production batches.

Adi Example Calculation

To illustrate how an ADI might be conceptualized if one were established, consider a hypothetical example where a flavoring agent had a numeric ADI of X mg per kg body weight per day. For a person weighing 70 kg, their theoretical daily intake at the ADI would be 70 times X mg. In practical terms, flavoring agents are used in food at levels far below those that would approach an ADI, because their sensory potency means only trace amounts are needed to achieve desired flavor effects. This example does not imply that CYCLOPENTANETHIOL has a defined numeric ADI; rather it illustrates how ADIs function as a regulatory tool. The calculation helps contextualize why the quantity of a flavoring agent consumed through normal food use is unlikely to approach levels of toxicological concern, given that flavoring agents are applied at small concentrations. It underscores that ADIs provide a safety benchmark rather than a recommended consumption target.

Safety And Health Research

Safety assessment for food ingredients involves a comprehensive review of toxicological data, exposure estimates, and chemical structure. For CYCLOPENTANETHIOL, information compiled in flavoring evaluations and chemical databases includes aspects such as acute toxicity, chemical reactivity, and structural considerations. Primary sources of data include compilations of studies reviewed by expert panels like those convened for JECFA evaluations, which analyze flavoring agents collectively based on their structural groups and available toxicology. General toxicological data from chemical reference sources indicate that organosulfur compounds can have varying toxicity profiles depending on their structure and exposure route. For example, oral toxicity studies in rodents provide baseline information on dose‑related effects, though detailed human data are often limited for specific flavoring agents. Structural class evaluations help regulators characterize potential safety concerns and define appropriate levels of use that minimize risk. Because flavoring agents are employed at very low concentrations, overall exposure is typically low compared to other dietary components. Safety assessments take into account the compound’s chemical behavior, metabolic pathways, and absence of significant accumulation at these low exposure levels. The focus of research and regulatory review is ensuring that any potential hazard is sufficiently characterized and that usage patterns are consistent with established safety principles, such as good manufacturing practice. Ongoing research in toxicology and food safety continues to inform understanding of how specific flavor compounds interact with biological systems, though definitive statements about human health effects at customary use levels require robust data. Existing evaluations emphasize that exposure from flavor use should remain low, and safety conclusions are framed within the context of conservative, science‑based frameworks.

Regulatory Status Worldwide

Globally, regulatory frameworks address the use of flavoring agents such as CYCLOPENTANETHIOL through listings, evaluations, and inventory systems. In the United States, flavoring substances are cataloged in inventories that reflect their recognition by expert panels and inclusion in agencies’ databases. For example, the Substances Added to Food inventory, formerly known as EAFUS, includes flavoring agents that have been evaluated by organizations such as the Flavor and Extract Manufacturers Association (FEMA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA), though inclusion does not by itself constitute a direct regulatory approval by the FDA. Extensive information on how substances are classified under food additives law is provided in Title 21 of the Code of Federal Regulations, including provisions for synthetic flavoring substances and adjuvants. Internationally, flavoring substances are included in global specifications developed by expert committees such as JECFA, which evaluates safety and establishes analytical specifications for additives. CYCLOPENTANETHIOL has a JECFA number (516) and is listed in flavoring specifications databases, indicating that it has been assessed within the context of flavoring agents. These specifications support consistent quality and identity standards for compounds used in food applications. Unlike some additives that have defined numeric Acceptable Daily Intake (ADI) values established through extensive toxicological evaluation, many flavoring agents—including certain thiols—are used at levels that do not present appreciable risk when employed under good manufacturing practices. Regulatory systems recognize that flavoring agents are used at low concentrations, and expert evaluations consider exposure, chemistry, and safety in determining their status. Users of such ingredients should be familiar with relevant inventories and specifications that reflect international consensus on their use and identity.

Taste And Functional Properties

CYCLOPENTANETHIOL exhibits distinctive sensory characteristics, primarily defined by an alliaceous, savory, and somewhat complex odor and flavor profile. Organosulfur compounds often convey robust sensory signals even at low concentrations, and this compound is no exception. At appropriate use levels, it can evoke notes reminiscent of onion, garlic, celery, or other savory elements, contributing to the depth and nuance of a flavor blend. Such characteristics are harnessed by flavorists to create or enhance savory food profiles where specific aromatic notes are desirable. From a functional perspective, the behavior of CYCLOPENTANETHIOL in food systems is influenced by its chemical properties. Thiols are generally more volatile and reactive than many other flavor compounds, which means they can contribute to the initial aroma impact when a food is first encountered. Its volatility also means that it may dissipate more quickly during cooking processes, so formulation strategies take this into account when designing flavor profiles for cooked or heated foods. Solubility characteristics—being more soluble in alcohols and oils than in water—inform how it is incorporated into flavor emulsions or oil‑based flavor carriers. The stability of thiols can be affected by heat, light, and pH, which are factors that food scientists consider when working with these compounds. For example, exposure to high heat may cause degradation or oxidation, altering sensory attributes. As a result, application methods often involve encapsulation or other delivery systems that protect the functional integrity of the compound until consumption. Understanding these functional properties helps guide its practical use in food development, ensuring that desired taste impacts are reliably achieved in finished products.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a regulatory concept used to describe the amount of a substance that can be consumed on a daily basis over a lifetime without appreciable health risk. ADIs are established based on comprehensive toxicological data, where researchers identify a No‑Observed‑Adverse‑Effect Level (NOAEL) in animal studies and apply safety factors to account for differences between species and individual variability in humans. These safety factors help ensure that exposure at the ADI is well below levels associated with toxicity. For many flavoring agents, especially those used at very low levels in foods, specific numeric ADI values may not be established directly in regulatory documents. Instead, experts may rely on structural and exposure considerations to determine that use at typical flavoring concentrations does not present a safety concern. The absence of an established numeric ADI does not necessarily imply risk; rather it reflects that exposure is minimal and that comprehensive toxicology data at higher doses support safety at customary use levels. It is important to note that an ADI is not a recommended intake level but a regulatory threshold that helps guide safe use. ADIs are typically expressed in milligrams of substance per kilogram of body weight per day (mg/kg bw/day). When a compound lacks a specific ADI value, regulatory assessments often focus on ensuring that exposures from dietary use remain low and consistent with expert evaluations of safety margins. Consumers should understand that flavoring agents are evaluated within frameworks designed to protect public health, with ADIs serving as one tool in that assessment.

Comparison With Similar Additives

CYCLOPENTANETHIOL can be compared with other sulfur‑containing flavoring agents such as allyl mercaptan or other alkyl mercaptans, which also contribute distinct savory or alliaceous notes in food. These compounds share a thiol functional group but differ in carbon chain length and structural context, which influences their sensory profiles and functional behavior. For example, allyl mercaptan may impart sharper, more pungent onion or garlic aromas, while CYCLOPENTANETHIOL can provide a broader savory nuance. Another point of comparison is with non‑sulfur flavoring agents that contribute umami or savory perception, such as certain amino acid derivatives or nucleotides. While those compounds achieve savory taste through different sensory mechanisms, thiol‑based compounds offer distinctive aromatic complexity that complements other savory enhancers. Understanding these differences helps flavorists select appropriate combinations to achieve desired sensory outcomes. A broader comparison with chemically distinct classes of flavoring agents highlights that each category brings unique attributes to food formulations. Organosulfur compounds are notable for their low odor thresholds and potent sensory contributions, requiring careful calibration. In contrast, other flavoring categories may require higher use levels to achieve similar impact, illustrating the diverse toolkit available to food developers. Such comparisons show how CYCLOPENTANETHIOL fits within the broader landscape of flavor chemistry, where functional properties, sensory profiles, and use considerations guide selection.

Common Food Applications Narrative

In the realm of modern food formulation, flavoring agents like CYCLOPENTANETHIOL are leveraged to deliver nuanced sensory experiences that consumers associate with savory and cooked foods. While natural ingredients such as onions, garlic, or celery provide foundational flavor, the consistency and intensity required in industrial food production often necessitate the use of specific flavor compounds. This compound, with its alliaceous and savory character, is part of that toolkit, offering flavorists a means to fine‑tune taste profiles across a range of products. Food products that may incorporate such savory flavor agents include savory snack seasonings, processed soups and broths, sauces and dressings, and certain prepared meals where a robust umami impression is sought. These applications benefit from the compound’s ability to support the overall flavor complexity without dominating the profile. For example, a savory snack seasoning blend may include multiple components that together create a balanced taste; the addition of a sulfur‑containing flavor helps anchor garlic or onion notes within that blend. Similarly, in a sauce formulation, this compound can contribute subtle depth, enhancing the perception of richness and fullness that consumers expect from savory products. Even though it is used at trace levels due to its potency, the impact of such a flavoring agent is meaningful in the context of overall sensory design. Food developers consider how molecules like this interact with other ingredients, both chemically and perceptually, to achieve a cohesive taste that resonates with consumer expectations. This narrative highlights that CYCLOPENTANETHIOL’s role is instrumental in delivering sophisticated savory nuances across diverse food categories in which consistent flavor delivery is key to product success.

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Safety & Regulations

FDA

  • Notes: Inclusion in flavor inventories does not by itself constitute direct FDA approval; specific CFR listing confirmation unavailable.

EFSA

  • Notes: No specific EFSA numeric ADI found in authoritative evaluations.

JECFA

  • Notes: JECFA compound specification exists with number 516 but no numeric ADI explicitly listed in the available specification reference.

Sources

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