What is Ethyl Cis-3-hexenoate?
Ethyl Cis-3-hexenoate, identified by its CAS Number 64187-83-3, is an organic compound classified chemically as an ester. Specifically, it is the ethyl ester of cis-3-hexenoic acid, meaning it is formed from cis-3-hexenol (a type of alcohol) and acetic acid, or more accurately, from ethanol and cis-3-hexenoic acid. Its molecular structure contributes to its characteristic aroma profile. In its pure form, it is typically a clear liquid with a distinct odor.
This compound is valued in the food and fragrance industries for its unique scent, often described as a fresh, green, and fruity aroma. Specific notes associated with Ethyl Cis-3-hexenoate include nuances of apple, pear, kiwi, strawberry, and passion fruit. While it is synthesized for commercial use, trace amounts of Ethyl Cis-3-hexenoate can be found naturally in various fruits and plant materials, contributing to their complex aromatic signatures. For instance, it has been identified in apples, strawberries, kiwis, and various tropical fruits, as well as in some wines and teas.
Common Uses
The primary function of Ethyl Cis-3-hexenoate in the food industry is as a flavoring agent or adjuvant. Due to its distinctive green and fruity notes, it is a popular ingredient in flavor formulations designed to mimic or enhance the taste and aroma of a wide variety of fruits. Its versatility allows it to be incorporated into numerous food products, including:
* **Beverages:** Used in fruit juices, soft drinks, flavored waters, and alcoholic beverages to provide authentic fruit profiles, particularly for apple, pear, kiwi, or strawberry-flavored drinks.
* **Confectionery:** Found in candies, chewing gums, jellies, and other sweets where a fresh, fruity taste is desired.
* **Baked Goods:** Incorporated into cakes, pastries, cookies, and other baked items to add a specific fruit aroma.
* **Dairy Products:** Used in yogurts, ice creams, flavored milks, and other dairy desserts.
* **Desserts:** Enhances the flavor of puddings, fruit fillings, and other dessert preparations.
Ethyl Cis-3-hexenoate is typically used at very low concentrations, as is characteristic for most potent flavoring agents. Its purpose is to contribute a specific aromatic dimension, often in conjunction with other flavor compounds, to create a well-rounded and appealing sensory experience for consumers.
Safety Assessment
The safety of Ethyl Cis-3-hexenoate as a food additive has been evaluated by expert scientific bodies globally. In the United States, while not directly listed as FDA GRAS (Generally Recognized As Safe), it is recognized as GRAS by the Flavor and Extract Manufacturers Association (FEMA) under FEMA GRAS No. 3229. FEMA is an independent scientific body that evaluates the safety of flavoring substances, and its GRAS determinations are generally accepted by the U.S. Food and Drug Administration (FDA) for the use of flavorings in food.
The European Food Safety Authority (EFSA) has also assessed Ethyl Cis-3-hexenoate as part of its comprehensive evaluations of flavoring substances. It falls under specific Flavouring Groups, often evaluated based on its chemical structure and metabolic fate. For example, it has been included in Flavouring Group 2, subgroup 2.1, of esters of aliphatic primary alcohols with aliphatic acids. Based on the available toxicological data and estimated dietary exposures, EFSA has concluded that there is no safety concern for Ethyl Cis-3-hexenoate at the estimated levels of intake from its use as a flavoring substance.
Metabolically, esters like Ethyl Cis-3-hexenoate are generally well-understood. Upon ingestion, they are typically hydrolyzed (broken down) in the digestive system and liver into their constituent alcohol (ethanol) and carboxylic acid (cis-3-hexenoic acid). These breakdown products are then metabolized through normal biochemical pathways or excreted from the body. Given the low usage levels of flavoring agents, systemic exposure to the parent compound and its metabolites is generally minimal.
As of the latest available data, there have been 0 adverse events reported to the FDA concerning Ethyl Cis-3-hexenoate, and no recalls initiated due to safety concerns related to its use in food.
Regulatory Status
* **United States:** Ethyl Cis-3-hexenoate is not listed individually as FDA GRAS. However, it holds **FEMA GRAS status (No. 3229)**, which permits its use as a flavoring agent in food under current good manufacturing practices. The FDA generally accepts FEMA GRAS determinations for flavorings.
* **European Union:** Ethyl Cis-3-hexenoate is authorized for use as a flavoring substance within the European Union. It has been evaluated by the European Food Safety Authority (EFSA) within the framework of the EU's flavoring legislation. EFSA's scientific opinions typically conclude that the substance poses no safety concern at the estimated levels of dietary intake, as long as it is used according to specified conditions.
* **Other Countries:** Many other regulatory bodies around the world, including those in Canada, Australia, and parts of Asia, often consider the evaluations and approvals from FEMA and EFSA when establishing their own regulations for flavoring substances. Consequently, Ethyl Cis-3-hexenoate is generally permitted for use as a flavoring agent in numerous countries globally.
Key Studies
The safety assessments for Ethyl Cis-3-hexenoate by regulatory bodies like FEMA and EFSA are based on a comprehensive review of scientific studies. Key studies typically include:
* **Metabolism Studies:** These studies investigate how the body processes and breaks down Ethyl Cis-3-hexenoate, confirming its hydrolysis into common metabolic intermediates (ethanol and cis-3-hexenoic acid) and their subsequent excretion or further metabolism.
* **Toxicological Studies:** These can include acute oral toxicity tests to determine immediate harmful effects, genotoxicity studies to assess potential DNA damage, and repeat-dose studies in animal models to evaluate any long-term effects from repeated exposure at various concentrations.
* **Exposure Assessments:** These estimate the typical dietary intake levels of Ethyl Cis-3-hexenoate from its use in food products, which are then compared against the levels found to be safe in toxicological studies to ensure a sufficient margin of safety.
The FEMA Expert Panel's GRAS assessment for Ethyl Cis-3-hexenoate, along with EFSA's scientific opinions (e.g., from Flavouring Group Evaluations like FGE.02), synthesize findings from these types of studies. The consistent conclusion across these expert evaluations supports the safety of Ethyl Cis-3-hexenoate when used as a flavoring agent at anticipated dietary intake levels.