What is Ethyl Trans-2-hexenoate?
Ethyl trans-2-hexenoate (CAS Number: 27829-72-7) is a synthetic organic compound belonging to the ester chemical class. It is characterized by a trans-configuration double bond in its molecular structure, which contributes to its sensory properties. The compound is volatile and produces fruity, apple-like aromatic notes commonly associated with fresh fruit flavors. As a synthetic flavoring ingredient, it does not occur naturally in significant quantities and is manufactured through chemical synthesis for use in food applications.
Common Uses
Ethyl trans-2-hexenoate is used primarily in the flavor industry as a flavoring agent and flavor enhancer. Its applications include:
- Beverage flavoring, particularly in fruit-flavored drinks and juices
- Confectionery and candy products requiring apple or fruity notes
- Dairy products, including flavored yogurts and desserts
- Baked goods and snack items
- Flavor compound blends for processed foods
The compound is typically used in very small concentrations, as is standard practice with synthetic flavor compounds, where potency allows for minimal application levels to achieve desired sensory results.
Safety Assessment
The safety profile of ethyl trans-2-hexenoate has not generated significant toxicological concerns in available scientific literature. According to FDA records, there have been zero adverse event reports and zero recalls associated with this ingredient. The absence of reported safety incidents suggests that when used at typical flavoring concentrations, it does not present obvious acute safety hazards.
As with many synthetic flavoring compounds, the primary safety consideration relates to appropriate use levels. Flavor compounds are intentionally used at very low concentrations in food products, which substantially limits potential exposure. The volatile nature of this ester means that some degradation may occur during food processing and storage.
No significant independent toxicology studies specific to this compound appear in readily available scientific databases, which is not uncommon for lesser-used synthetic flavoring agents. The flavor industry generally employs established screening protocols and chemical structural analysis to assess the safety of new flavor ingredients before commercial use.
Regulatory Status
Ethyl trans-2-hexenoate is not on the FDA's GRAS (Generally Recognized as Safe) list. This does not necessarily indicate safety concerns; rather, it reflects that the ingredient has not been submitted for or granted GRAS status through FDA review. Many synthetic flavor compounds operate under FDA's Flavor and Extract Manufacturers' Association (FEMA) Generally Recognized as Safe (GRAS) program, which maintains separate expert panels and databases from the FDA's formal GRAS list.
The compound may be used in food under FDA regulations for flavoring substances, provided it complies with CFR Title 21 Part 182 regulations for indirect food additives and flavoring regulations. In the European Union, synthetic flavor compounds are subject to EFSA (European Food Safety Authority) evaluation and must be listed on approved flavor registers before use.
Key Studies
Limited peer-reviewed toxicological research appears to be specifically published on ethyl trans-2-hexenoate alone. Most safety assessments of this compound likely derive from structural-activity relationship analysis, standard toxicology screening, and the chemical similarity to other approved ester flavor compounds with established safety histories.
The flavor industry's assessment framework relies heavily on established precedent—since this compound belongs to a well-characterized chemical class (short-chain esters), regulatory evaluation typically considers data from structurally similar approved flavoring agents. This approach is consistent with FDA guidance on flavoring substance evaluation.