What It Is
DIHYDRO-ALPHA-IONONE is an organic aroma compound that functions as a flavoring agent or adjuvant in food and beverage formulations. It is chemically classified as a C13 apocarotenoid ketone with a characteristic woody, floral and fruity scent profile that contributes complexity to flavor systems. This compound is identified by the CAS number 31499-72-6 and recognized by flavor industry databases such as the Flavor and Extract Manufacturers Association (FEMA) with FEMA number 3628 and by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) with JECFA Number 393, indicating that it has been part of expert evaluations for safety in use as a flavor substance. Its sensory profile blends berry, floral and woody notes, making it useful across a variety of flavoring applications where depth and nuance are desired. Naturally, DIHYDRO-ALPHA-IONONE occurs in trace amounts in various fruits and plant materials, including berries and teas, where it contributes to the overall aroma complexity. In industrial practice, it is typically sourced synthetically or through controlled hydrogenation of alpha-ionone precursors to achieve consistent purity and sensory quality. As a flavoring ingredient, it does not impart a singular dominant taste but serves to enhance fruit‑like, floral or woody top notes within broader flavor formulations. In regulatory and safety contexts, this compound is regarded within expert panels that assess flavoring substances. While not assigned a simple numeric approval like a food additive with a specific Code of Federal Regulations section, its inclusion in flavor evaluative listings reflects a recognized role in food formulation under defined use conditions.
How It Is Made
The production of DIHYDRO-ALPHA-IONONE is generally achieved through chemical synthesis involving partial hydrogenation of alpha‑ionone or closely related precursors. Alpha‑ionone itself is derived from carotenoid degradation or chemical synthesis, and when selectively hydrogenated, the resulting dihydro derivative forms the target compound. This chemical route allows manufacturers to produce consistent and defined sensory materials for use in flavoring applications. From a manufacturing perspective, the partial hydrogenation process is carried out under controlled conditions to ensure the correct saturation of the carbon backbone without over‑reduction or formation of unwanted byproducts. The resulting DIHYDRO-ALPHA-IONONE is typically characterized by analytical techniques to verify purity, isomeric composition and sensory properties before it is incorporated into flavor blends. In commercial settings, flavor houses and chemical suppliers handle the synthesis, purification and formulation steps to produce a flavoring ingredient that meets industry quality standards. These steps are designed to minimize impurities and ensure that the material consistently delivers the expected aromatic profile when used in food and beverage systems. The processes involved are grounded in established organic chemistry methods for terpenoid and ketone synthesis.
Why It Is Used In Food
DIHYDRO-ALPHA-IONONE is used in food and beverage products primarily because of its sensory impact. Its floral and fruity aroma characteristics contribute to enhancing or modifying complex flavor profiles, particularly in formulations where nuances of berry, wood and floral notes enrich the overall sensory experience. Flavorists often select this ingredient because it can provide layers of olfactory interest that elevate simple sweet or fruit characterizations into more rounded and complex profiles. Flavoring agents such as DIHYDRO-ALPHA-IONONE do not themselves impart significant nutritive value but serve important functional roles in the perception of taste and aroma. Human taste perception is closely tied to aroma compounds, and by adding select flavoring agents, product developers can achieve desired sensory outcomes with lower use levels compared to bulk ingredients like sugars or acids. In practice, this compound is blended into flavor bases and concentrates for categories including confectionery, baked goods, beverages, dairy analogs, and other applications where floral or fruit complexity is desired. These uses are consistent with industry practices for flavor additives that are evaluated and listed by expert panels such as FEMA and included in additive specification listings such as those managed by JECFA, albeit without simple numeric regulatory approvals that would apply to color additives or direct food preservatives.
Adi Example Calculation
Because DIHYDRO-ALPHA-IONONE does not have a specific numeric ADI assigned by JECFA or other regulators, an illustrative calculation uses hypothetical values solely for explanation. For example, if a flavor ingredient had an ADI of X mg per kilogram of body weight, a person weighing 70 kg would have an illustrative safe exposure of 70 times that number. In the context of flavoring agents, actual use levels are orders of magnitude lower, often in parts per million, making typical dietary exposure far below hypothetical safety thresholds. This type of calculation demonstrates how ADI frameworks function: by combining a numeric intake limit with body weight to yield a daily exposure level that is considered safe over a lifetime. Illustrative examples help clarify how exposures from food fit within safety margins, even in the absence of explicit numeric ADIs for specific flavoring substances.
Safety And Health Research
Safety and health research for flavoring compounds like DIHYDRO-ALPHA-IONONE focuses on toxicological evaluations conducted by expert panels such as FEMA and JECFA. These assessments consider available toxicology data, estimated dietary exposures, and structure‑activity relationships to determine whether use as a flavoring ingredient is appropriate under intended conditions. The FEMA evaluation and JECFA summary reflect structured review processes that consider such data in the context of overall exposure from flavor use. General toxicology endpoints typically considered include acute toxicity, genotoxicity, and subchronic or chronic toxicity, with a focus on establishing margins of safety based on expected use levels. Because DIHYDRO-ALPHA-IONONE is used in very low concentrations, dietary exposure is correspondingly low, shaping the interpretation of available safety data. While specific quantitative safety limits such as an ADI are not universally published for this compound, the expert evaluation listings reflect conclusions that it can be used as intended without identified safety concerns at typical use levels. Careful formulation and adherence to industry use recommendations help ensure that DIHYDRO-ALPHA-IONONE contributions to overall intake remain within customary flavor use patterns. Regulatory safety evaluations are periodically updated to reflect new data and methodologies.
Regulatory Status Worldwide
DIHYDRO-ALPHA-IONONE appears in regulatory and industry evaluations related to flavoring substances. For example, it is listed under the Flavor and Extract Manufacturers Association (FEMA) Flavor Library with FEMA number 3628 and has a JECFA Number 393, indicating that expert panels have reviewed its safety as a flavoring ingredient under specified conditions of intended use. These listings reflect that the compound is considered for use as a flavoring substance based on expert evaluation rather than a direct assignment in specific codified food additive lists. In the United States, flavoring substances such as DIHYDRO-ALPHA-IONONE may appear in the FDA’s Substances Added to Food (formerly EAFUS) list with reference to expert assessments; however, specific CFR sections assigning approval are not directly documented in publicly searchable references. This means that its regulatory status is typically governed through recognition by expert panels rather than standalone numeric approvals in the Code of Federal Regulations. Internationally, expert panels like JECFA provide assessments that inform Codex Alimentarius and other regulatory frameworks. The presence of a JECFA Number indicates that the compound has been part of international evaluations, and such evaluations often inform national regulatory positions. Because specific numeric allocations (such as an INS or E‑number) for flavoring agents are not uniformly assigned across jurisdictions, the regulatory status of DIHYDRO-ALPHA-IONONE is best understood through these expert evaluation listings rather than discrete additive approval codes.
Taste And Functional Properties
DIHYDRO-ALPHA-IONONE exhibits a sensory profile described by industry flavor databases as woody, floral and fruity with subtle berry undernotes. At low concentrations, the compound contributes top notes that enhance perceived complexity in flavor systems without dominating the profile. The functional performance of this compound in food systems is influenced by its volatility, solubility in flavor carriers, and interaction with other aromatic components. Because of its relatively strong olfactory impact, DIHYDRO-ALPHA-IONONE is incorporated in parts per million or lower in finished food and beverage products. Its effectiveness at low concentrations allows flavorists to shape sensory perception without increasing ingredient costs or altering the base taste structure. It tends to blend well with both natural and artificial flavor matrices, making it a flexible tool in flavor formulation. In technical contexts, the stability of this compound under processing conditions such as heat, pH variation and storage should be considered. Like many aroma compounds, the balance between desired sensory contribution and stability challenges motivates precise formulation and handling practices. When properly formulated, DIHYDRO-ALPHA-IONONE enriches the sensory profile without introducing off notes or instability.
Acceptable Daily Intake Explained
Acceptable Daily Intake (ADI) is a concept used by regulators and expert panels to describe an amount of a substance that can be consumed daily over a lifetime without appreciable health risk. For many flavoring compounds, including DIHYDRO-ALPHA-IONONE, expert panels such as JECFA and FEMA evaluate available data to determine whether such an intake threshold needs to be defined. In cases where estimated dietary exposure from typical flavor use is low and existing toxicology data do not indicate concerns, a specific numeric ADI may not be assigned. The absence of a published numeric ADI for DIHYDRO-ALPHA-IONONE does not imply it is unsafe; rather, it reflects regulatory evaluation approaches that consider estimated exposure from intended use levels and overall safety margins. In practice, flavoring compounds are used at concentrations much lower than would be expected to produce systemic effects, and expert assessments integrate these use levels into their risk characterization. Understanding an ADI helps contextualize how flavoring ingredients are assessed relative to overall diet. When expert panels deem a compound suitable for use without numeric ADI assignment, it means that typical use levels are not anticipated to result in exposures approaching safety concern thresholds based on current science.
Comparison With Similar Additives
DIHYDRO-ALPHA-IONONE can be compared with other flavoring agents such as alpha‑ionone and beta‑ionone, which share structural similarities and contribute floral and fruity notes in flavor applications. While alpha‑ionone has a more pronounced violet character and beta‑ionone offers deeper berry and wood notes, DIHYDRO-ALPHA-IONONE’s partially saturated structure modulates its sensory profile toward a blend of fruity and floral complexity. These differences influence how flavorists select each compound in specific applications. Other comparable compounds include related ionone derivatives that vary in functional groups or saturation states, each offering unique nuances in sensory contributions. The choice among these additives depends on the desired flavor outcome, volatility characteristics, and compatibility with other ingredients in a flavor system. Understanding these relationships helps product developers achieve balanced and appealing sensory profiles using a palette of structurally related aroma chemicals.
Common Food Applications Narrative
DIHYDRO-ALPHA-IONONE serves as a nuanced aroma component in a variety of consumer foods and beverages where heightened sensory complexity is valued. In baked goods, its floral and fruity characters can complement fruit‑forward notes from ingredients such as berries, citrus peels or dried fruits, enhancing the aromatic perception of fruit fillings or glazes. In confectionery applications such as hard candies or gummies, the compound contributes to layered flavor perceptions when combined with sweet or sour base notes, making fruit flavors more vibrant. Beverage applications can include flavored waters, soft drinks and non‑alcoholic blends where floral or berry nuances enrich base profiles, especially when used in conjunction with other fruit‑derived flavor compounds. Dairy and dairy‑alternative products also benefit from the subtle aromatic lift that compounds like DIHYDRO-ALPHA-IONONE provide, helping to round out profiles in products such as yogurts and dessert creams. Beyond these categories, the ingredient is used in seasoning blends, snack coatings and other flavor systems where a hint of floral, woody or fruity nuance can elevate an overall sensory experience. In each instance, the inclusion of such a flavoring agent is carefully balanced with other components to achieve a harmonious and appealing taste and aroma.
Safety & Regulations
FDA
- Notes: No specific CFR approval section verified; listed in substances added to food references via expert panels.
EFSA
- Notes: No EFSA numeric ADI verified from authoritative source.
JECFA
- Notes: JECFA listing exists but numeric ADI not explicitly shown in the accessible evaluation summary.
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