ACETALDEHYDE ETHYL ISOBUTYL ACETAL

CAS: 6986-51-2 FLAVORING AGENT OR ADJUVANT

ACETALDEHYDE ETHYL ISOBUTYL ACETAL is an acetal-class flavouring agent recognized in international flavoring evaluations. It has been assessed by the Joint FAO/WHO Expert Committee on Food Additives and appears in authoritative flavouring inventories.

What It Is

ACETALDEHYDE ETHYL ISOBUTYL ACETAL (CAS 6986-51-2) is a synthetic acetal compound belonging to the broader class of organic acetals. In the context of food science, this compound functions primarily as a flavouring agent or adjuvant used to impart or modify sensory characteristics in formulated food products. Chemically, acetals are derivatives of aldehydes in which the carbonyl group has been converted into a pair of ether-like linkages, often increasing stability toward hydrolysis compared to the original aldehyde. The multiple synonyms associated with this compound, including propane, 1-(1-ethoxyethoxy)-2-methyl-, 1-(1-ethoxyethoxy)-2-methylpropane, and 1-ethoxy-1-isobutoxyethane, reflect its structural features and the range of naming conventions in chemical registries and flavouring inventories. Acetals like this one are widely used in the flavour and fragrance fields because they can contribute nuanced sensory notes at relatively low concentrations. Regulatory and evaluation bodies such as JECFA and flavour industry panels categorize this substance based on its technical use rather than nutritional or functional food properties.

How It Is Made

The synthesis of acetals such as ACETALDEHYDE ETHYL ISOBUTYL ACETAL typically involves the chemical reaction of an aldehyde with an alcohol under controlled conditions. In this case, acetaldehyde reacts with appropriate alcohols like ethanol and isobutyl alcohol under acidic catalysis to form the mixed acetal. This process generally requires careful control of reaction conditions including temperature and catalyst concentration to maximize yield and limit byproducts. After synthesis, standard chemical purification techniques such as distillation are employed to separate the target compound from residual reagents and any side products. Purity and identity of the final product are typically verified through analytical techniques such as gas chromatography, infrared spectroscopy, and nuclear magnetic resonance. In commercial contexts, manufacturing and handling must comply with chemical safety regulations and good manufacturing practices to ensure consistency and safety of the material supplied for flavour applications. While precise industrial synthesis routes are proprietary to manufacturers, the underlying acetal formation chemistry is well documented in organic chemistry literature.

Why It Is Used In Food

ACETALDEHYDE ETHYL ISOBUTYL ACETAL is used in food primarily for its flavouring properties. In flavour formulations, acetals can add complexity to aroma and taste profiles due to their ability to contribute subtle fruity, ethereal, or other characteristic sensory notes even at low concentrations. As a flavouring agent, its role is not nutritional but technological: it enhances or modifies sensory perception without imparting substantive caloric content. In many flavour systems, acetals can interact synergistically with other volatile compounds to produce balanced profiles that are desirable in consumer products. Their chemical stability and relatively predictable performance under typical processing conditions make them useful in categories such as beverages, confectionery, and baked goods. Food formulators often choose specific acetals to achieve target sensory outcomes while complying with regulatory and safety guidance. This use reflects a broader trend in the flavour industry of leveraging small organic molecules to tailor organoleptic experiences in foods and beverages.

Adi Example Calculation

Because ACETALDEHYDE ETHYL ISOBUTYL ACETAL was concluded by expert review to present no safety concern at current levels of intake as a flavouring agent, a formal numeric acceptable daily intake (ADI) was not published in the JECFA evaluation. In the absence of a numeric ADI, traditional example calculations that illustrate intake relative to body weight are not applicable. However, the general principle behind such calculations is to estimate daily intake from food consumption patterns and compare this to the ADI. For example, if a hypothetical flavouring agent with an established ADI of X mg per kilogram body weight were used, intake estimates for an individual of a given body weight (for instance, Y mg/kg for a 60‑kg adult) could be compared to the ADI to assess relative margin of safety. In the case of this compound, the expert assessment indicated that the typical levels of intake from flavour uses are below thresholds of concern without assigning a specific numerical ADI.

Safety And Health Research

Safety evaluations for ACETALDEHYDE ETHYL ISOBUTYL ACETAL by expert bodies focus on the compound’s toxicological profile and estimated intake from food use. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) specifically assessed this compound and concluded that it poses no safety concern at current intake levels when used as a flavouring agent. This conclusion is based on evaluations of relevant chemical, toxicological, and exposure information compiled during expert review. Such evaluations consider metabolic pathways, potential toxic effects, and typical levels of human exposure in food contexts. Research into flavouring agents often involves assessment of genotoxicity, subacute and chronic toxicity in experimental systems, and considerations of structural similarity to other compounds with known profiles. Safety conclusions by expert bodies imply that, within the context of intended flavour use, the compound does not present hazards that outweigh its functional benefits. Nonetheless, ongoing monitoring of food additive safety and updated research may inform future assessments, and regulatory bodies periodically review substances as new data become available.

Regulatory Status Worldwide

Internationally, ACETALDEHYDE ETHYL ISOBUTYL ACETAL has been evaluated by expert committees for its safety as a flavouring agent. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has assessed this compound and reported that it presents no safety concern at current levels of intake when used as a flavouring agent, according to the JECFA database listing for this chemical (JECFA number 2305). This evaluation indicates that, based on available data and typical exposure estimates, the compound does not raise safety concerns under intended use conditions. The presence of this substance in the USDA and FDA’s Substances Added to Food inventory reflects its recognition in flavour inventories, although inclusion in the inventory does not itself constitute formal FDA approval of specific uses. In the United States, flavouring agents evaluated by industry panels such as the Flavor and Extract Manufacturers Association (FEMA) are included in the Substances Added to Food inventory maintained by the FDA, which consolidates data on flavouring substances and related evaluations. Regulatory authorities in other regions may reference JECFA evaluations and industry panels when considering national allowances and guidance for use levels. Overall, the regulatory context for this compound is shaped by expert review of safety and intake rather than by explicit numeric regulatory limits in many jurisdictions.

Taste And Functional Properties

ACETALDEHYDE ETHYL ISOBUTYL ACETAL contributes distinct sensory characteristics that can be described as ethereal or fruity, although precise taste descriptors depend on the whole flavour matrix in which it is used. Acetals in general tend to exhibit stability toward mild acidic or neutral food environments, which means they can persist through blending and formulation steps without significant degradation. The solubility of acetals is often more favorable in organic phases or hydroalcoholic systems rather than pure water, which aligns with their common use in flavour blends for products with substantial non-aqueous components. The functional behaviour of this compound in food matrices is shaped by its volatility and partitioning between phases, which influences how the sensory notes are perceived during consumption. Importantly, it does not function as a sweetener, preservative, nutrient, or texture modifier; rather, it is a component among many in flavour design. The compound’s performance can be influenced by factors such as temperature, pH, and interaction with other flavour components, which formulators consider when developing finished products. Understanding these functional properties helps in achieving consistent flavour outcomes while maintaining product stability.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory concept used by expert bodies to express the amount of a substance that can be ingested daily over a lifetime without appreciable health risk. In the case of ACETALDEHYDE ETHYL ISOBUTYL ACETAL, JECFA’s evaluation indicated that there is no safety concern at current levels of intake for its use as a flavouring agent, which suggests that formal numeric ADI values were not established but instead the compound was considered safe under typical exposure scenarios. This ‘no safety concern’ classification means that experts consider the estimated exposure from food use to be sufficiently low relative to any toxicological thresholds of concern. The ADI concept incorporates safety factors to account for uncertainties in data and variability among individuals. It is important to understand that an ADI is not a recommended intake but a conservative boundary below which risk is not expected, based on available evidence. For flavouring agents with similar profiles, this expert guidance supports their continued use within well‑defined use levels in food and beverage formulations.

Comparison With Similar Additives

ACETALDEHYDE ETHYL ISOBUTYL ACETAL is one of many acetal‑type flavouring agents evaluated by expert bodies. Similar compounds, such as other mixed acetals formed from aldehydes and alcohols, share structural features and are assessed in flavouring group evaluations. These compounds often have related sensory properties and may function to impart subtle ethereal or fruity notes in flavour systems. Compared to simple acetals like acetaldehyde diethyl acetal, which also serve as flavouring agents in certain beverage contexts, ACETALDEHYDE ETHYL ISOBUTYL ACETAL is tailored for specific sensory contributions dictated by its unique alcohol moieties. Assessments of structural class I acetals generally indicate that, at typical exposure levels, they are efficiently metabolized and do not saturate metabolic pathways, which contributes to their classification as low risk at current usage levels. Differences among similar acetals primarily lie in volatility, sensory impact, and physicochemical properties that influence their behaviour in food matrices. Expert evaluations consider these similarities when grouping compounds for collective safety assessments.

Common Food Applications Narrative

Food and beverage products often rely on carefully balanced flavour systems to meet consumer expectations, and ACETALDEHYDE ETHYL ISOBUTYL ACETAL plays a role in such systems by contributing specific sensory cues. For example, in nonalcoholic beverages, this flavouring agent may be used at trace levels to enhance perceived fruitiness or to round out complex aroma profiles in citrus or fermented beverages. In confectionery, acetals can help balance sweetness with subtle background notes that reinforce a desired sensory identity without dominating the taste. Baked goods and snack products may incorporate this type of flavouring ingredient to support consistent flavour across production batches, especially where heat or processing steps might otherwise attenuate delicate natural notes. Additionally, the compound can be a component of flavour preparations for dairy-based desserts and ice desserts, where it supports nuanced profiles that appeal to consumer preferences. It is important to note that the inclusion of such flavouring agents is based on formulation needs and regulatory allowances rather than nutritional requirements, and use levels are guided by sensory efficacy and safety evaluations by relevant expert bodies.

Safety & Regulations

FDA

  • Notes: Inclusion in the Substances Added to Food inventory reflects recognition in flavour inventories but does not alone constitute a specific FDA food additive regulation.

EFSA

  • Notes: No specific EFSA numeric ADI available from authoritative EFSA opinion for this ingredient.

JECFA

  • Year: 2023
  • Adi Display: No safety concern at current levels of intake when used as a flavouring agent

Sources

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