What is 2,4-hexadienyl Isobutyrate?
2,4-hexadienyl isobutyrate (CAS Number: 16491-24-0) is a synthetic organic compound belonging to the ester class of flavor chemicals. It is composed of a 2,4-hexadienyl alcohol moiety esterified with isobutyric acid. The compound is characterized by its volatile nature and fruity, somewhat floral organoleptic profile, which makes it theoretically useful in the flavor industry for creating complex fruit and botanical flavor profiles.
Common Uses
While 2,4-hexadienyl isobutyrate possesses flavor characteristics, it does not have approved food applications in the United States. The compound may be used in laboratory settings for flavor research or in non-food consumer products such as fragrances, cosmetics, or other industrial applications where food safety regulations do not apply. It is not listed among FDA-approved flavoring agents for human food consumption.
Safety Assessment
Toxicological data for 2,4-hexadienyl isobutyrate is limited in the publicly available scientific literature. The FDA has received zero adverse event reports and zero recall reports associated with this compound, likely reflecting its lack of approval and minimal use in food products. The absence of adverse reports does not constitute a safety determination, as the compound has not undergone the comprehensive safety evaluation required for food additive approval.
The structure of 2,4-hexadienyl isobutyrate—a conjugated diene ester—does not suggest obvious toxicological concerns based on structural analogues, but conclusive safety data would require appropriate in vitro and in vivo studies to assess acute toxicity, chronic toxicity, genotoxicity, and potential metabolic effects. Such studies do not appear to have been conducted or submitted to regulatory agencies for this specific compound.
Regulatory Status
2,4-hexadienyl isobutyrate does not hold Generally Recognized as Safe (GRAS) status from the FDA. It is not listed in the Code of Federal Regulations (CFR) Title 21 as an approved flavoring agent for food use in the United States. This means that manufacturers cannot legally add this compound to foods intended for human consumption without first obtaining FDA approval through a food additive petition, which would require submission of comprehensive safety data and toxicological studies.
The European Food Safety Authority (EFSA) maintains a flavoring database; however, compounds not previously evaluated or approved cannot be used in food in the European Union without going through their rigorous approval process. No evidence suggests this compound has been formally evaluated or approved by EFSA for food use.
Key Studies
A systematic search of peer-reviewed literature reveals minimal published toxicological or safety studies specifically addressing 2,4-hexadienyl isobutyrate. The compound does not appear in major flavor safety databases or published monographs from the International Organization of the Flavoring Industry (IOFI) or similar bodies. Without peer-reviewed safety data, formal risk assessments, or regulatory approvals, conclusions about the safety profile cannot be drawn.
For any synthetic flavor chemical to be approved for food use, manufacturers must submit detailed safety dossiers including chemical identity, proposed use levels, analytical methods, toxicological studies, and metabolism data to regulatory authorities. This approval process protects consumer safety by ensuring only adequately tested substances are permitted in the food supply.