DECANAL PROPYLENEGLYCOL ACETAL

CAS: 5421-12-5 FLAVORING AGENT OR ADJUVANT

Decanal propyleneglycol acetal is a synthetic compound used as a flavoring agent in food products. It is evaluated by international expert committees for use in food flavor applications.

What It Is

Decanal propyleneglycol acetal is a synthetic flavoring compound utilized in the food industry as a flavoring agent or adjuvant. Its chemical identity is tied to the CAS number 5421-12-5, and it is sometimes referred to by the longer chemical description 1,3-dioxolane, 4-methyl-2-nonyl, or related InChI and InChIKey identifiers. This substance belongs to a class of dioxolane compounds that are formed by the acetalization of decanal with propylene glycol, yielding a stable cyclic acetal structure. In food science and formulation, such acetals are selected for their ability to contribute to or enhance specific aroma profiles in complex flavor blends. In practical terms, this ingredient functions by introducing or modifying sensory characteristics within a food matrix, often complementing other volatile compounds. The molecular configuration of decanal propyleneglycol acetal confers distinctive sensory properties, which have been catalogued in flavor libraries under established evaluation programs. Regulators and expert panels consider both the chemical nature and the context of intended use when assessing its suitability for inclusion in food products. Its use as a flavoring agent is predicated on assessed safety parameters and technological necessity in specific applications.

How It Is Made

The manufacture of decanal propyleneglycol acetal involves a chemical reaction between decanal, a ten-carbon aldehyde with its own characteristic odor qualities, and propylene glycol, a common diol used to form acetals. Acetalization is a standard reaction in organic chemistry, in which an aldehyde reacts with a diol under acidic conditions to form a cyclic acetal and water. This reaction is widely used to modify aldehydes, protecting them in chemical synthesis or producing derivatives with altered volatility and stability suitable for industrial applications. In the food flavor industry, the process is optimized to achieve high purity and yield while controlling byproducts. Industrial chemical synthesis facilities monitor reaction conditions such as temperature, catalyst concentration, and reactant ratios to ensure consistent quality. The resulting decanal propyleneglycol acetal is then purified, typically by distillation or chromatographic methods, to meet specification limits for residual reactants and impurities. Analytical verification of structure and purity is conducted using spectroscopic methods such as nuclear magnetic resonance and infrared spectroscopy. The end product is a clear, colorless liquid that can be incorporated into flavor formulations.

Why It Is Used In Food

Decanal propyleneglycol acetal is incorporated into food products because of its ability to deliver or modify aroma impressions, contributing to the sensory experience of flavor. In flavor science, small molecules that impart specific odor characteristics are often blended in precise concentrations to achieve target profiles that are pleasing to consumers. This ingredient can support floral, green, or citrus notes depending on the formulation context, enabling flavorists to craft nuanced sensory outcomes. The technological purpose of such flavoring agents extends beyond simple aroma addition; they can enhance the perception of natural flavors, mask off-notes from processing, or provide stability to a flavor blend during storage and exposure to varying temperatures. In formulated foods ranging from confections to beverages, the judicious use of flavoring agents like decanal propyleneglycol acetal helps ensure consistent taste profiles across batches. The use of this compound aligns with broader flavor development strategies where synthetic and natural flavor components are combined based on sensory objectives, cost considerations, and regulatory acceptance.

Adi Example Calculation

An illustrative example of how ADI might be used can help explain the concept, but it is important to note that no numerical ADI was assigned for this specific ingredient. Hypothetically, if a compound had an ADI of X milligrams per kilogram of body weight per day, a 70-kilogram adult could theoretically consume up to 70 times X milligrams of the substance daily over a lifetime without expected adverse effects. Because decanal propyleneglycol acetal does not have a defined ADI from JECFA, this example serves purely to explain how ADI calculations function generally, and should not be interpreted as applying to this ingredient itself.

Safety And Health Research

Safety assessments of flavoring agents like decanal propyleneglycol acetal focus on potential toxicological effects relative to expected exposure levels from food consumption. Expert committees such as JECFA review data on chemical identity, metabolic fate, and toxicology to determine whether typical intake poses a safety concern. The 2007 evaluation by JECFA concluded that no safety concern exists at current levels of intake when used as a flavoring agent, suggesting that the available evidence did not indicate adverse health effects under typical usage conditions. These assessments consider parameters such as general toxicity, genotoxicity, and other endpoints relevant to food safety. It is important to understand that the absence of a numerical ADI in this context does not equate to unrestricted use; rather, it reflects the committee’s judgment that the compound’s safety profile and levels of exposure inherent in flavor use do not warrant a numerical constraint based on the data reviewed. Research in food safety continues to monitor flavoring agents broadly, and any new data that emerge could influence future evaluations. The focus remains on ensuring that flavoring substances are used within parameters that support consumer safety.

Regulatory Status Worldwide

Decanal propyleneglycol acetal has been subject to evaluation by international expert bodies to determine its suitability for use in food flavoring. According to the Joint FAO/WHO Expert Committee on Food Additives (JECFA), this compound carries a JECFA number 1744 and was reviewed with respect to safety as a flavoring agent; the expert committee concluded that there is no safety concern at current levels of intake when used as a flavoring agent based on available data (evaluation year 2007). This evaluation reflects an international consensus on its safety in the context of typical use patterns. A corresponding record is maintained in the FAO JECFA database summarizing the assessment and specification status. Additionally, the substance is listed in the United States Food and Drug Administration’s Substances Added to Food (formerly EAFUS) database, indicating recognition of its role as a flavoring ingredient without a specific separate regulation in the Code of Federal Regulations, and it appears in the FDA Global Substance Registration System with a unique ingredient identifier. There is no established numerical acceptable daily intake (ADI) from JECFA, and regulatory bodies such as EFSA have not published a formal ADI for this specific compound. National regulations may vary, and the ingredient’s status in any given market depends on local food additive provisions, but international expert panels provide foundational evaluations that inform these decisions.

Taste And Functional Properties

Sensory and functional behavior of decanal propyleneglycol acetal in food formulations is shaped by its chemical properties. This compound is characterized by a clear, colorless liquid form, with a noted green and floral aromatic impression at appropriate use levels. Its solubility behavior tends toward organic media rather than aqueous environments, making it more compatible with flavor systems that are oil-based or use solvents such as ethanol to disperse flavor components. The molecular configuration provides a relatively stable profile under typical food processing conditions, although extreme heat or pH may influence its integrity like other flavor constituents. From a sensory standpoint, flavorists describe the organoleptic properties of this acetal as contributing subtle yet distinct aroma notes that blend with other components in complex formulations. The functional role is not limited to odor; its physicochemical characteristics influence how it interacts with other ingredients and the food matrix. Sensory testing and analytical characterization help determine system-specific behavior, guiding formulators in selecting appropriate concentrations that achieve desired flavor profiles without overpowering other constituents. The compound’s volatility, olfactory threshold, and compatibility with other flavoring agents are critical parameters in formulation design.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) is a scientific estimation of the amount of a substance that can be consumed every day over a lifetime without appreciable health risk, based on toxicological data and safety factors. For many food additives, expert bodies derive an ADI by identifying a no-observed-adverse-effect level in animal studies and applying uncertainty factors to account for differences between animals and humans and variability within human populations. In the case of decanal propyleneglycol acetal, the Joint FAO/WHO Expert Committee on Food Additives evaluated available data and concluded that there is no safety concern at current intake levels when used as a flavoring agent, and therefore did not establish a specific numerical ADI. This outcome indicates confidence in its safety at the low levels typically encountered in food applications, rather than defining a formal numeric threshold.

Comparison With Similar Additives

Decanal propyleneglycol acetal can be compared with other flavoring acetals that are used to convey specific sensory notes. For example, hexanal propyleneglycol acetal and octanal propyleneglycol acetal are structurally related compounds that contribute slightly different odor profiles due to the length and branching of their carbon chains. While all such acetals serve flavoring functions, their sensory properties differ, leading formulators to select one over another based on the desired aromatic impact in a particular product. In contrast, esters such as ethyl butyrate provide fruity notes but differ in chemical class and metabolic handling. Comparing classes underscores how functional groups and molecular structure influence both sensory perception and formulation choices, with safety assessments for each compound guided by respective evaluations from expert panels.

Common Food Applications Narrative

In the food industry, flavoring agents such as decanal propyleneglycol acetal find use in a broad array of product categories where specific aroma profiles enhance consumer appeal. For example, in baked goods, subtle floral or fruity nuances introduced by this compound can complement primary flavor ingredients such as fruit extracts or sweeteners. Beverage applications may incorporate it as part of a nonalcoholic flavor blend to enrich the aromatic complexity without contributing taste that competes with primary notes. Confections and candies benefit from carefully balanced volatile profiles, where low-threshold aroma compounds help reinforce thematic flavor cues. In dairy and dairy-alternative products, this kind of synthetic flavoring can support clean and consistent flavor impressions across production lots, especially when natural variability in raw materials would otherwise lead to inconsistent sensory outcomes. Processed snack foods that rely on seasoning blends also utilize flavoring agents to achieve signature profiles that appeal to target demographics. In each of these applications, formulators aim to balance sensory impact with regulatory compliance and safety considerations, ensuring that the inclusion of flavoring agents aligns with established guidelines. Common uses reflect the dual goals of sensory enhancement and product stability.

Safety & Regulations

FDA

  • Notes: Specific FDA regulation section not identified; listed in the Substances Added to Food database without a numeric CFR citation.

EFSA

  • Notes: EFSA has not published a specific ADI or E-number for this compound.

JECFA

  • Year: 2007
  • Notes: JECFA evaluation concluded no safety concern at current intake levels; no numeric ADI assigned.

Sources

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