What is 2-Hexenyl Hexanoate, Trans-?
2-hexenyl hexanoate, trans- (CAS Number: 53398-86-0) is a synthetic ester compound belonging to the class of flavoring agents. It is created through the chemical combination of hexanoic acid and 2-hexenol. The "trans-" designation refers to the specific geometric configuration of the compound's molecular structure. This volatile organic compound is characterized by its fruity and slightly floral aroma, making it valuable in the flavor industry.
Common Uses
As a flavoring agent, 2-hexenyl hexanoate, trans- is used in very small quantities in various food and beverage applications. Its primary function is to enhance or impart fruity flavor notes to consumer products. Common applications include:
- Flavored beverages (soft drinks, juices, flavored waters)
- Confectionery and candy products
- Dairy-based products (yogurts, flavored milk)
- Baked goods and snack products
- Chewing gum and mints
Like most synthetic flavoring compounds, it is used at concentrations well below 1% in finished food products, with typical usage rates measured in parts per million (ppm).
Safety Assessment
The safety profile of 2-hexenyl hexanoate, trans- is characterized by limited but available data. The FDA has not granted this compound GRAS (Generally Recognized as Safe) status, meaning it has not been formally evaluated through the standard GRAS notification process. However, this does not indicate the compound is unsafe; rather, it reflects that either a formal safety petition has not been submitted or the evaluation process has not been completed.
Importantly, there are zero reported adverse events associated with this additive in the FDA's adverse event reporting system, and no product recalls have been issued related to its presence in food. This suggests it has a history of safe use at typical flavoring concentrations.
The compound's structure as an ester suggests it would be metabolized similarly to other fatty acid esters in the human digestive system, breaking down into its component parts (hexanoic acid and 2-hexenol) which are naturally occurring compounds found in various foods.
Regulatory Status
Under U.S. regulations, 2-hexenyl hexanoate, trans- operates in a regulatory gray area. Without GRAS status, it cannot be used in foods with the presumption of safety that GRAS compounds enjoy. However, it may be used under FDA's Food Additive Petition process if a manufacturer submits appropriate safety data and receives approval. The absence of reported adverse events and recalls suggests that products containing this ingredient have been marketed and consumed without documented safety concerns.
International regulatory frameworks vary. The European Food Safety Authority (EFSA) maintains its own approval lists for flavoring substances. The regulatory status in other countries should be verified if seeking information about specific markets.
Key Studies
Limited peer-reviewed research specifically addresses 2-hexenyl hexanoate, trans-. Most safety evaluation data exists within proprietary industry submissions to regulatory agencies. The compound's safety profile is primarily informed by:
- Structural analogy to approved flavoring compounds
- Absence of acute toxicity at relevant exposure levels
- The chemical similarity to naturally occurring esters
- Historical use data without adverse event reports
The flavoring industry generally relies on weight-of-evidence approaches for compounds in this chemical class, evaluating metabolism, typical human exposure levels, and structure-activity relationships. For compounds seeking GRAS determination, manufacturers typically conduct or compile studies on acute toxicity, subchronic toxicity, and potential genotoxicity.
Additional research or formal safety petitions may be needed to establish definitive GRAS status or to expand regulatory approvals in different jurisdictions.