What It Is
1,1-DIMETHOXY-TRANS-2-HEXENE is an organic acetal used in the flavor industry to impart a green fruity note in food products. Also known by multiple synonyms including 2-HEXENAL DIMETHYL ACETAL and (E)-2-hexenal dimethyl acetal, it has been evaluated for safety and use as a flavouring substance by the Flavor and Extract Manufacturers Association (FEMA) and included in international expert evaluations of food flavourings. According to FEMA, this compound is assigned the FEMA number 4098 and has been reviewed by expert panels for its use in foods under intended conditions. A specification for this flavouring has been adopted by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) as flavouring agent number 1728, and it is described as a colourless liquid with a fruity aroma for use in food flavouring applications. The inclusion of such flavouring agents in inventories and specifications indicates regulatory consideration of this compound's technical effect and safety in the context of flavouring use in foods.
How It Is Made
1,1-DIMETHOXY-TRANS-2-HEXENE is typically synthesized through a chemical reaction known as acetalization, where the corresponding aldehyde (trans-2-hexenal) reacts with methanol under acidic conditions to form the dimethyl acetal. This process protects the aldehyde functional group and yields a stable acetal structure that is useful in flavour formulations because of its fragrance properties. The acetalization reaction involves the addition of two methoxy groups to the carbonyl carbon of the aldehyde, forming a geminal diether. The resulting product is usually purified to meet food flavouring specifications, such as those detailed in the JECFA flavourings specification, which outlines criteria for purity and physical characteristics, including minimum assay percentage and refractive index ranges. The synthesis and purification process is designed to produce a high-purity flavouring substance that meets regulatory standards for use in food-grade applications. (FAOHome
Why It Is Used In Food
1,1-DIMETHOXY-TRANS-2-HEXENE is used in food primarily for its technical function as a flavouring agent. Flavouring agents are added to food products in very low concentrations to impart, modify, or enhance flavor characteristics without contributing nutritional value. In this case, the compound is valued for its green fruity and apple-like aroma notes, which can complement and balance other flavour profiles in a wide range of foods, including beverages, confectionery, baked goods, and dairy products. The use of such flavouring agents allows manufacturers to achieve consistent sensory profiles in complex formulations where natural variability in raw materials might otherwise affect taste and aroma. By using defined flavouring substances like 1,1-DIMETHOXY-TRANS-2-HEXENE, food formulators can tailor sensory experiences that meet consumer expectations for freshness and fruitiness. The inclusion of this compound in inventories like FEMA’s list of flavouring ingredients reflects its acceptance in the industry as a flavor modifier under conditions of intended use. (FEMA
Adi Example Calculation
To illustrate how intake of a flavouring agent like 1,1-DIMETHOXY-TRANS-2-HEXENE might be considered in a hypothetical scenario, one can consider a simplified example: if a beverage contains this compound at a low typical use level (for example, milligrams per liter range), and an adult consumes a liter of that beverage, the total intake from that consumption would be in the milligram range. When such intake is compared to the body weight of an adult, expressed in milligrams per kilogram of body weight, the resulting exposure level is far below thresholds of concern determined from toxicological data. Because JECFA’s evaluation indicated no safety concern at current levels of intake when used as a flavouring agent, this example highlights that typical dietary exposure through normal use patterns is low relative to the safety evaluation context. It is important to note that this example is illustrative and not a recommended intake level or health advice, but rather a demonstration of how low use levels relative to body weight are considered in safety assessments.
Safety And Health Research
The safety assessment of 1,1-DIMETHOXY-TRANS-2-HEXENE has been addressed through evaluation by organizations such as the FEMA Expert Panel and JECFA. JECFA’s evaluation concluded that, based on available data and typical exposure scenarios from use as a flavouring agent, there is no safety concern at current levels of intake when used in foods, indicating that the available toxicological data, including structural information and metabolic considerations, do not suggest adverse effects at those usage levels. These assessments typically consider a range of endpoints including acute toxicity, metabolic fate, and structural alerts for genotoxicity, as part of the overall safety evaluation. The FEMA Expert Panel’s review, which informs GRAS determinations and inclusion in flavor libraries, also examines available data on metabolism and effects in model systems to ensure that the compound does not pose unreasonable safety risks when used as intended. Overall, regulatory safety evaluations focus on ensuring low exposure relative to potential hazard, consistent with principles of risk assessment for flavouring agents.
Regulatory Status Worldwide
1,1-DIMETHOXY-TRANS-2-HEXENE has been evaluated by international expert bodies for its use as a flavouring agent. The Flavor and Extract Manufacturers Association (FEMA) has assigned it FEMA number 4098, indicating an expert panel review of its safety for use as a flavor ingredient. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) included it in its Flavourings Specification database under number 1728 and provided a specification that outlines purity criteria and physical properties for its use in foods. According to JECFA’s evaluation, no safety concern at current levels of intake when used as a flavouring agent has been identified, which reflects consideration of available toxicological data and typical use patterns. In the United States, the FDA’s Substances Added to Food (formerly EAFUS) inventory lists this compound with its technical effect as a flavouring agent or adjuvant, recognizing its inclusion in flavour inventories, though specific CFR section approval is not delineated in the available listing. Globally, regulatory acceptance in food flavouring applications is largely based on expert evaluations by bodies such as FEMA and JECFA, which focus on intended use levels, safety data, and specifications.
Taste And Functional Properties
1,1-DIMETHOXY-TRANS-2-HEXENE is recognized for its medium strength fruity aroma, often described as green apple-like, which contributes to its utility in flavour formulations. Sensory descriptors for this compound typically include fruity and fresh notes that can enhance or complement other aromatic components. In terms of functional behavior, acetals such as this one are generally more stable than their corresponding aldehydes under a range of pH conditions, which can be beneficial in complex food matrices where acidity and processing conditions vary. The acetal structure tends to be resistant to oxidation compared to aldehydes, which can help maintain consistent sensory characteristics throughout the shelf life of the product. Solubility properties are dependent on the food matrix, but this compound is typically soluble in organic solvents used in flavour formulation and behaves predictably under standard food processing conditions, contributing to its versatility as a flavouring agent. (FAOHome
Acceptable Daily Intake Explained
An Acceptable Daily Intake (ADI) is an estimate of the amount of a substance in food or drinking water that can be consumed daily over a lifetime without appreciable health risk, based on current scientific evidence and incorporating safety factors. For many flavouring agents, ADIs may not be explicitly established because typical exposure levels through flavour use are low and toxicological data do not indicate safety concerns at those levels. In the case of 1,1-DIMETHOXY-TRANS-2-HEXENE, JECFA’s evaluation concluded that there is no safety concern under current conditions of intake for its use as a flavouring agent. This implies that, based on available data and standard exposure assessments, intake from its use in food flavouring is considered safe without requiring a specific numeric ADI. As a result, regulatory bodies focus on ensuring proper specifications and use levels rather than establishing a formal ADI, reflecting expert judgment on safety margins.
Comparison With Similar Additives
1,1-DIMETHOXY-TRANS-2-HEXENE can be compared with other fruity flavouring agents such as ethyl butyrate or ethyl acetate. Ethyl butyrate is known for its strong fruity pineapple-like aroma and is used in fruit-flavored products, whereas ethyl acetate imparts a sweet fruity note more common in confectionery. Compared to these, 1,1-DIMETHOXY-TRANS-2-HEXENE tends to contribute a greener, apple-like quality that can complement rather than dominate a flavour profile. Functional differences arise from their chemical structures, which influence volatility, olfactory thresholds, and stability in various food matrices. While all these compounds serve to enhance sensory attributes in foods, their specific aroma profiles and chemical behavior under processing conditions may guide formulators in selecting one over another depending on the desired sensory outcome. (FEMA
Common Food Applications Narrative
1,1-DIMETHOXY-TRANS-2-HEXENE is commonly used as a flavouring substance in a wide range of food categories where fruity and green notes are desired. Its green apple-like character makes it suitable for inclusion in beverages, desserts, snack foods, confectionery, and baked goods that benefit from a fresh, fruity aroma profile. In beverages, it may contribute to fruity nuances in soft drinks, fruit drinks, and alcoholic beverages. In confectionery, its fruity note can help balance sweetness and provide complexity in hard candies, gummies, and chocolate coatings. Dairy-based products such as flavored yogurts or ice creams can also employ this flavouring to enhance fruit-like sensory attributes, particularly in fruit-flavored varieties. Additionally, it is used in savory applications where a hint of fruitiness can juxtapose saltier elements to create more complex taste experiences in sauces and snacks. The utility of this compound in such applications stems from its ability to deliver specific aroma characteristics that are consistent and reproducible, aiding manufacturers in achieving desired sensory targets across product lines. (FEMA
Explore familiar flavors
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Flavor ideas
Apple for breakfast and baking
Try unsweetened applesauce in muffins, quick breads, or as an easy fruit snack.
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Safety & Regulations
FDA
- Notes: Inclusion in the FDA Substances Added to Food inventory indicates recognition for use as a flavouring agent adjuvant, but no specific CFR section approval could be verified in the available sources.
EFSA
- Notes: No specific EFSA E-number or numeric ADI could be verified in the available sources.
JECFA
- Notes: JECFA evaluation indicates no safety concern at current levels of intake for flavouring use, but no explicit numeric ADI or year could be extracted from the accessible specification documents.
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