2-(trans-2-pentenyl)cyclopentanone

2-(trans-2-pentenyl)cyclopentanone, identified by CAS number 51608-18-5, is a synthetic organic compound classified as a flavoring agent. Its structure consists of a cyclopentanone ring (a five-membered carbon ring with one oxygen atom) with a trans-2-pentenyl side chain attached. This chemical belongs to the broader category of cyclopentanone derivatives, which are commonly used in the flavor and fragrance industry.

This flavoring compound is used in food manufacturing to provide or enhance specific flavor notes. Due to its chemical structure, it likely contributes fruity, herbaceous, or woody flavor characteristics to finished food products. Like most synthetic flavoring agents, it is used in very small quantities—typically measured in parts per million (ppm)—to achieve the desired sensory effect. It may appear in beverages, baked goods, confectionery, dairy products, or other processed foods where flavor enhancement is desired.

This additive has not received FDA GRAS (Generally Recognized as Safe) status, meaning it has not been formally affirmed as safe through the GRAS notification process. However, the absence of GRAS status does not necessarily indicate safety concerns; rather, it may reflect limited commercial use or lack of submission for formal review.

According to FDA records, there are zero reported adverse events associated with this compound and zero recalls citing this ingredient. This absence of reported harm suggests it has not been flagged as causing safety problems in the food supply.

The chemical properties of cyclopentanone derivatives suggest they are metabolized and eliminated by the body similarly to other small organic molecules. However, comprehensive toxicological studies specific to this compound are not widely published in the scientific literature, which contributes to its "unknown" regulatory status.

In the United States, while not GRAS-affirmed, this compound may be used under the FDA's Food Additive Regulations if it has received approval or notification through appropriate channels. The European Union's EFSA maintains separate lists of approved flavorings, and regulatory acceptance may differ between jurisdictions.

The lack of FDA GRAS status means manufacturers using this ingredient must ensure compliance with applicable regulations in their specific markets. Some manufacturers may choose to use it under the Food and Drug Administration's food additive petition process or other regulatory pathways.

Scientific literature specifically evaluating the safety and toxicology of 2-(trans-2-pentenyl)cyclopentanone is limited. Most information about this compound comes from its chemical characterization and industrial use data rather than published clinical studies. The lack of published adverse event data, combined with zero FDA-reported incidents, suggests either safe use at current exposure levels or minimal consumer exposure.

Research on structurally similar cyclopentanone derivatives provides some context for understanding potential behavior, though direct extrapolation should be avoided. The absence of mutagenic, carcinogenic, or reproductive toxicity reports in available data sources indicates no known major safety red flags, though comprehensive preclinical testing results for this specific compound are not readily available in public databases.

For manufacturers or consumers seeking more detailed safety information, direct consultation with toxicology resources or regulatory agencies may be warranted.