What is Cis-3-hexenyl Formate?
Cis-3-hexenyl formate (CAS Number: 33467-73-1) is a synthetic organic compound belonging to the formate ester family of flavor chemicals. It is produced through chemical synthesis rather than extraction from natural sources, though it occurs naturally in trace amounts in some plants and fruits. The compound has a characteristic fresh, green, grassy aroma with slight fruity notes, making it valuable for creating authentic green leaf and herbaceous flavor profiles in commercial food products.
Common Uses
This flavoring agent is used primarily in the beverage industry, including alcoholic beverages such as beer, wine, and spirits where it contributes to fresh hop or botanical notes. It is also employed in non-alcoholic beverages, particularly those marketed with herbal or botanical positioning. In the food sector, cis-3-hexenyl formate appears in limited applications including certain confectionery products, baked goods, and dairy-based beverages where a fresh, green flavor enhancement is desired.
Typical usage levels are in the parts-per-million range, reflecting the potency of the compound. Flavor manufacturers use it as part of proprietary flavor blends rather than as a standalone ingredient visible on consumer labels.
Safety Assessment
Cis-3-hexenyl formate has not been formally evaluated or approved by the FDA as a Generally Recognized as Safe (GRAS) substance through its formal petition process. However, the compound has generated zero adverse event reports in the FDA's adverse event tracking system and has no associated product recalls. This absence of reported safety concerns reflects either limited historical use or an acceptable safety profile based on consumption patterns.
The chemical structure and metabolism of formate esters are generally understood from toxicological research on similar compounds. Formates are typically metabolized through ester hydrolysis and oxidation pathways. The low concentrations at which this flavoring is used in food products further reduces potential exposure concerns.
No carcinogenicity, mutagenicity, or reproductive toxicity concerns have been identified in available literature for this specific compound. Its use follows the same regulatory framework as other synthetic flavor chemicals approved for food use in developed markets.
Regulatory Status
While cis-3-hexenyl formate lacks FDA GRAS status, it operates within a regulatory framework where flavor manufacturers use substances on an interim basis, particularly in Europe and other regions with established flavor ingredient lists. The European Flavouring Regulation (EC) No 1334/2008 includes pathways for flavor ingredient use, though specific approval status varies by jurisdiction.
The compound is recognized and used within the flavor industry in North America and Europe, typically under regulations governing indirect food additives or flavoring substances. Its lack of formal FDA GRAS petition may reflect limited commercial demand rather than safety concerns, as the formal GRAS petition process is resource-intensive and pursued primarily for high-volume ingredients.
Key Studies
Limited published safety data exists specifically for cis-3-hexenyl formate, which is typical for low-volume specialty flavor chemicals. Available information is based primarily on data packages maintained by flavor manufacturers and shared through regulatory channels. The safety assessment relies on structural analogy to closely related formate esters that have undergone toxicological testing, as well as the established safety profiles of similar C6 flavor compounds.
General toxicology of formate esters indicates low acute toxicity via oral routes at typical food exposure levels. The chemical volatility of this compound (evident from its strong aroma) indicates limited bioavailability in the gastrointestinal tract, with primary sensory exposure occurring via olfactory pathways at very low concentrations.