2-CYCLOPENTYLCYCLOPENTANONE

CAS: 4884-24-6 FLAVORING AGENT OR ADJUVANT

2-Cyclopentylcyclopentanone (CAS 4884-24-6) is a synthetic ketone used as a flavoring agent or adjuvant with a fruity green-minty aroma, evaluated by flavor safety panels and identified with FEMA number 4514 and JECFA number 2050.

What It Is

2-Cyclopentylcyclopentanone is an alicyclic ketone compound defined by the Chemical Abstracts Service with registry number 4884-24-6 and classified as a flavoring agent or adjuvant used in food formulations. This compound is included in flavor ingredient inventories such as the FEMA flavor library under FEMA number 4514 and is identified with JECFA number 2050, indicating its evaluation by international food additive safety bodies. It is characterized by a clear, colorless liquid form with a fruity green mint and woody odor profile, which contributes to its flavor application potential in specific food and beverage contexts. Its structure consists of a cyclopentanone core with a cyclopentyl substituent, and it is also known by several synonymous names reflecting its bicyclic nature and ketone functional group. The compound’s identification via the International Chemical Identifier (InChI) and InChIKey facilitates linking chemical databases for research and regulatory reference purposes. The FEMA and JECFA identifiers are important for food technologists and regulatory compliance professionals to track safety evaluations and usage context of this flavoring agent.

How It Is Made

As a specialized flavoring ketone, 2-Cyclopentylcyclopentanone is typically synthesized via organic chemical processes involving the construction of a cyclopentanone ring followed by alkylation with a cyclopentyl moiety under controlled catalytic conditions. These synthetic pathways are designed to yield high-purity material suitable for flavor evaluation, though specifics may vary by manufacturer and proprietary method. Standard chemical production includes purification steps such as distillation and chromatography to remove byproducts and ensure consistent organoleptic and physicochemical properties. The manufacturing of flavoring compounds usually follows good manufacturing practice (GMP) standards, and analytical characterization—such as gas chromatography—confirms the high degree of purity required for regulatory or sensory panel assessments. Due to its specific use category and limited widespread application compared with primary food additives, industrial-scale synthesis volumes are relatively small and often tailored to the flavor industry’s formulation needs. As with many fine chemicals, production includes adherence to safety and handling protocols to mitigate occupational exposure to reactive intermediates and solvents during synthesis.

Why It Is Used In Food

2-Cyclopentylcyclopentanone is used in food and flavor formulations because its sensory characteristics contribute desirable aromatic notes in blend contexts where fruity and minty nuances are sought. Flavor chemists select such compounds to round out complex flavor profiles, enhancing consumer perception of freshness or complementing other ingredients in confectionery, beverage, or specialty food applications. Its role as an adjuvant underscores that it may not function alone but enhances or modifies the impact of other flavoring components, helping producers achieve target taste and aroma profiles more effectively. This compound’s inclusion in industry flavor libraries and safety evaluations reflects its technical relevance in formulations where subtle aroma modulation is critical for product acceptance. Because flavor agents such as this are used at very low concentrations, they influence sensory perception without contributing macro-nutritional value or altering fundamental food composition. Their use helps manufacturers deliver consistent flavor experiences across production batches and in varied product lines.

Adi Example Calculation

Because 2-Cyclopentylcyclopentanone does not have a specific numeric acceptable daily intake (ADI) value established by major regulatory bodies, an illustrative calculation using a hypothetical ADI is not feasible in this case. Generally, ADI calculations involve multiplying a numeric ADI by a standard body weight to estimate total allowable intake, but in the absence of an assigned numeric ADI for this specific compound, such an example would be speculative. The concept of ADI remains important for understanding how regulators manage potential risk from food additives and flavoring agents by using conservative safety factors to ensure consumer protection.

Safety And Health Research

Safety and health research for 2-Cyclopentylcyclopentanone has focused on its toxicological profile in the context of flavor use. International expert reviews such as the JECFA evaluation consider endpoints including acute and chronic toxicity, genotoxicity, and other standard toxicological assessments to ensure that compounds used as flavoring agents do not pose risks at expected exposure levels. Based on available evaluations, the consensus from flavor safety panels is that this compound does not present a safety concern when used in accordance with good manufacturing practice. Because flavor agents are used at very low concentrations, typical dietary exposure is minimal compared with other food components. Regulatory assessments emphasize that safety determinations are context-specific and contingent on the compound’s concentration in finished foods. Research publications on the compound outside regulatory contexts describe its physicochemical properties rather than health effects, reflecting its specialized use profile and limited direct dietary exposure. Ongoing surveillance of flavor ingredient evaluations by expert committees continues to inform safety frameworks and guidance for food technologists and regulators.

Regulatory Status Worldwide

2-Cyclopentylcyclopentanone has been evaluated by international expert bodies for use as a flavoring agent. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed this compound and, as noted in authoritative chemical evaluations, determined that it raises no safety concern at current levels of intake when used as a flavoring agent, indicating a favorable safety assessment context. National regulatory frameworks such as the FDA’s Substances Added to Food inventory include this compound as a flavoring substance evaluated by external expert panels, though inclusion in the inventory does not by itself constitute explicit "approval" under specific Code of Federal Regulations sections. There is no EU E-number associated with this substance listed in major EFSA flavor additive registers, and specific numeric permitted use levels or ADI values are not established in that schema. In general, flavoring agents with JECFA evaluations are used within the scope of good manufacturing practice, and their safety assessments inform regulatory oversight. Manufacturers and importers are responsible for ensuring compliance with local food additive regulations and labeling requirements, including documentation of expert safety evaluations and permissible use contexts.

Taste And Functional Properties

The taste and functional properties of 2-Cyclopentylcyclopentanone derive primarily from its aromatic profile rather than direct taste on the tongue. Organoleptically, it is described as delivering fresh, green, fruity, and cool mint-like notes that can synergize with other flavor compounds to create complex sensory experiences. In functional terms, flavoring agents like this tend to be sparingly soluble in water but more compatible with fat and ethanol-based matrices, reflecting their chemical nature as a nonpolar ketone with a cycloalkyl structure. This solubility behavior influences how it is incorporated into flavor solutions, emulsions, or encapsulated formats to ensure uniform distribution in the final product. The stability of this compound under typical food processing conditions—including moderate heat—allows it to retain its aromatic characteristics without significant breakdown during formulation. Flavorists working with ketonic compounds often balance them with other aromatics to avoid off-notes, leveraging their volatility and headspace properties to achieve desired sensory outcomes in complex flavor assemblies.

Acceptable Daily Intake Explained

Acceptable daily intake (ADI) is a regulatory concept that represents an estimate of daily exposure to a substance that is considered safe over a lifetime, expressed on a body weight basis. For specialized flavoring agents such as 2-Cyclopentylcyclopentanone, formal numeric ADI values are not established in major regulatory lists because the compound has been assessed under frameworks where no safety concern is identified at current intake levels. This means that while a numeric ADI is not prescribed, the safety evaluation context assumes that typical exposure through food use does not raise health concerns when the substance is used in accordance with good manufacturing practice. Regulators and flavor safety panels issue guidance that helps manufacturers manage use levels to ensure consumer safety. It is important for product developers to understand that ADI values, when defined, are not recommended intake targets but risk-based reference estimates that help inform regulatory decisions and safe use parameters in food formulation.

Comparison With Similar Additives

2-Cyclopentylcyclopentanone can be compared with other flavoring ketones and aromatic compounds used in food formulations. For example, compounds such as 2,3-Butanedione (diacetyl) and gamma-Nonalactone also provide distinctive aromatic profiles—diacetyl imparts buttery notes, and gamma-Nonalactone contributes creamy coconut-like aromas. In contrast, 2-Cyclopentylcyclopentanone delivers green, fruity, and minty nuances, illustrating how different ketones can fulfill divergent sensory roles in flavor design. Like many flavoring agents, all these compounds are evaluated by expert committees and used at low concentrations to achieve target sensory effects without contributing significant nutritional content. The choice among such compounds depends on the desired flavor profile and compatibility with other ingredients, and regulatory frameworks provide context for their safe and effective use within permissible flavoring practices.

Common Food Applications Narrative

In food product development and formulation contexts, 2-Cyclopentylcyclopentanone finds application primarily through the expertise of trained flavorists who integrate it into complex flavor blends. Its contribution of green, fruity, and minty aromatic qualities can support nuanced flavor profiles in products where subtle sensory layering is an advantage, such as in confectionery centers, specialty beverages, and seasonal food items. Because flavoring agents are used at trace levels, they do not substantively change nutritional content but can significantly influence consumer perception of aroma and overall flavor quality. In practice, this compound is blended with other ketones, esters, and terpenes to craft proprietary flavor signatures that remain stable through processing and on shelf. While direct use levels are typically guided by expert sensory panels and regulatory guidance, the broader context of food application is one where flavor balance and consumer expectations for aroma complexity drive ingredient selection. Flavor libraries maintained by industry associations provide references that help developers match specific sensory descriptors with candidate compounds such as 2-Cyclopentylcyclopentanone. This approach supports consistent product experiences across production volumes and aligns with performance goals in targeted food categories.

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Safety & Regulations

FDA

  • Notes: Included in FDA Substances Added to Food inventory as a flavoring substance evaluated by expert panels but no explicit CFR approval citation found

EFSA

  • Notes: No specific EFSA E-number or numeric ADI identified on authoritative EFSA documents

JECFA

  • Year: 2010
  • Notes: JECFA evaluation indicated no safety concern but no numeric ADI value provided
  • Adi Display: No safety concern at current levels of intake when used as a flavouring agent

Sources

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