What It Is
3',7-Dihydroxy-4'-methoxyflavan is a chemical compound belonging to the flavan subclass of flavonoids, a class of polyphenolic compounds that occur in plants and are used in food science for their sensory properties. The compound is identified by the Chemical Abstracts Service (CAS) Registry Number 76426-35-2 and has been associated with flavouring applications, particularly as a flavouring agent or adjuvant in processed foods under technical use categories. Synonyms for this substance include 3',7'-dihydroxy-4'-methoxyflavan 2H-1-benzopyran-7-ol and longer systematic names describing its chromene-based structure. Flavonoids like this compound are known in natural products chemistry as derivatives of the flavan framework, and they possess hydroxy and methoxy functional groups on their aromatic rings that contribute to their organoleptic characteristics. In flavour science, such compounds may be used intentionally to modify or enhance the sensory profile of food and beverage products. This compound appears in flavour ingredient databases with assignments related to its use in flavour blends and as a sweet type flavour enhancer, reflecting its role in food formulation rather than nutritional contribution. Its molecular structure and classification place it within the broader category of flavonoid derivatives that have been studied for both sensory and biological properties in various contexts, although its use in food is principally oriented around flavouring utility rather than nutritional impact. 3',7-Dihydroxy-4'-methoxyflavan is distinct from other flavonoid classes such as flavonols or flavones in that it lacks the 4-keto group common to those categories, instead featuring a saturated heterocyclic ring that classifies it within flavans. This structural distinction has implications for its sensory perception and chemical behavior in formulations. The compound's sweetness and aroma characteristics have been documented in flavour and fragrance supplier listings, suggesting a sensory profile that may contribute to sweetness or flavour enhancement when blended with other ingredients. In regulatory contexts, compounds with specific CAS identifiers like 76426-35-2 are reviewed under flavouring agent categories by expert committees and flavour ingredient panels, and are included in databases used by formulators to assess suitability for intended applications. Fundamentally, what defines 3',7-Dihydroxy-4'-methoxyflavan within food science and regulatory evaluation is its dual identity as a defined chemical entity with a CAS registration and as a flavouring-related compound assessed by international expert bodies for safety and use parameters.
How It Is Made
3',7-Dihydroxy-4'-methoxyflavan is typically accessed through synthetic organic chemistry routes designed to construct the flavan core and introduce specific hydroxy and methoxy substituents at defined positions on the aromatic rings. Flavan synthesis often involves the preparation of a chalcone precursor through an aldol-type condensation of appropriately substituted aromatic aldehydes and ketones, followed by an intramolecular cyclization step to form the heterocyclic flavan structure. In the case of 3',7-Dihydroxy-4'-methoxyflavan, the presence of hydroxy groups at the 3' and 7 positions and a methoxy group at the 4' position necessitates the use of starting materials or intermediates that bear these functional groups, or protective group strategies that allow for selective functionalization after ring closure. Organic synthesis methodologies in this class are designed to maximize yield and purity while minimizing byproducts. Common steps include the use of acid catalysts or Lewis acids to promote cyclization and hydrogenation steps to reduce chalcone intermediates to the saturated flavan ring. Purification of the final product is achieved through techniques such as chromatography, recrystallization, or other separation methods compatible with the physicochemical properties of the compound. The compound's melting point and solubility characteristics influence the choice of solvents and purification conditions. From a manufacturing perspective, the process must satisfy specifications for identity, purity, and residual solvents if the product is intended for food-grade applications, and should adhere to good manufacturing practices (GMP) where defined. Regulatory specifications that reference chemical identity and purity, such as those developed by expert committees like JECFA, provide context for the expected quality of the material, although specific manufacturing standards are defined by industry and regulatory frameworks applicable to flavouring substances. It should be noted that synthetic routes for flavanoids often mirror natural biosynthetic pathways found in plants, where enzymes catalyze the formation of the flavan nucleus from simpler phenylpropanoid precursors. However, industrial synthesis relies on controlled laboratory conditions optimized for reproducibility and scalability. Laboratory-scale syntheses of (±)-3',7-Dihydroxy-4'-methoxyflavan have been reported in the chemical literature, illustrating key steps in the formation of the flavan core and placement of functional groups. Such research reports typically serve as the basis for scaled production approaches and contribute to the knowledge base that informs safety and analytical evaluation by regulatory bodies.
Why It Is Used In Food
The use of 3',7-Dihydroxy-4'-methoxyflavan in food formulation is motivated by its contribution to flavour profiles, particularly its role as a flavouring agent or flavour enhancer. In food science, flavouring agents are chemicals that impart or modify taste and aroma characteristics to achieve desired sensory outcomes in consumer products. According to flavour ingredient listings, this compound exhibits a sweet-type odor and flavour profile, which suggests its utility in applications where subtle sweetness or enhancement of other flavour notes is desired. When used in combination with other components in complex flavour systems, it can influence the overall perception of sweetness and aroma, contributing to a balanced sensory experience. Food formulators often select flavouring agents like 3',7-Dihydroxy-4'-methoxyflavan to achieve specific sensory targets without relying solely on caloric sweeteners or sugars. This can be particularly useful in products seeking to reduce sugar content while maintaining palatability, although the compound itself is used at levels determined by sensory evaluation and regulatory guidance rather than as a bulk sweetener. Its functional classification as a flavour enhancer reflects this use case, where the compound modifies or boosts existing flavours rather than serving as a primary sweetening ingredient. Such compounds are typically blended in low concentrations and are part of a broader palette of flavour ingredients used by sensory scientists and formulators. Moreover, the inclusion of compounds with defined sensory attributes helps create consistent product experiences across batches and production sites. The controlled use of flavouring agents is a cornerstone of modern food manufacturing, enabling the creation of diverse products that meet consumer expectations for taste and aroma. Technical function descriptions for this compound list both flavouring and sweet type flavour attributes, which aligns with its selection for applications where a combination of taste modulation and enhancement is required. In this context, it complements other flavouring substances to achieve complexity and depth in finished products.
Adi Example Calculation
To illustrate how acceptable daily intake (ADI) concepts work in general, consider a hypothetical flavouring compound with an established ADI of "X mg/kg bw/day." For a person weighing 70 kilograms (about 154 pounds), the illustrative daily intake that would correspond to the ADI would be calculated by multiplying the ADI value by the body weight. For example, if a flavouring agent had an ADI of 1 mg/kg bw/day (hypothetical), the acceptable intake for a 70 kg person would be 70 mg per day. This calculation is illustrative only and should not be interpreted as applicable to 3',7-Dihydroxy-4'-methoxyflavan, which does not have a numeric ADI assigned by expert committees based on available evaluations. The purpose of such calculations is to provide context for how ADI values translate into amounts that might be encountered in diets. In regulatory practice, estimated dietary exposures are compared with ADI values to assess whether typical consumption patterns fall well below thresholds of concern. When exposures are significantly lower than numerical ADIs, regulators and expert panels conclude that there is a wide margin of safety. In the case of substances assessed as having no safety concern at current intake levels, this comparison uses qualitative assessments and threshold-of-concern approaches rather than specific numeric limits. This approach ensures that safety evaluations remain grounded in toxicological evidence and realistic exposure scenarios.
Safety And Health Research
Safety and health research for flavouring agents like 3',7-Dihydroxy-4'-methoxyflavan focuses on assessing potential toxicological hazards and estimating dietary exposure that might occur through food consumption. Expert committees such as JECFA review available data on chemical identity, metabolism, genotoxicity, subchronic and chronic toxicity studies, and other relevant endpoints to evaluate whether a compound poses a risk under expected conditions of use. For this compound, JECFA concluded that there was no safety concern at current intake levels when it is used as a flavouring agent, which implies that the available evidence did not identify significant toxicological hazards or exposures that exceeded thresholds of concern at typical use levels. In toxicological evaluations, experts consider endpoints such as acute toxicity, repeated-dose toxicity, reproductive and developmental effects, and potential genotoxicity. They also review information on absorption, distribution, metabolism, and excretion (ADME) to understand how the compound is handled by biological systems. For many flavouring substances with relatively low use levels and limited systemic exposure, conservative risk assessment approaches such as the threshold of toxicological concern (TTC) may be applied when specific data sets are incomplete. These approaches use structural considerations and comparison with well-studied chemicals to estimate exposure thresholds below which health risks are unlikely. Available industry and research literature on 3',7-Dihydroxy-4'-methoxyflavan is limited compared to extensively studied additives, but the presence of expert evaluations by JECFA and flavour ingredient panels indicates that sufficient information was available to assess safety within the context of its intended use. It is also important to note that safety assessments for flavouring agents are iterative processes that may be updated as new data become available. Manufacturers and regulatory bodies monitor emerging toxicological and exposure data to ensure that safety evaluations remain protective of public health. In general, a compound evaluated and concluded to have no safety concern at expected intake levels is considered suitable for use within defined conditions, but ongoing research and post-market surveillance contribute to refinement of safety understanding over time.
Regulatory Status Worldwide
3',7-Dihydroxy-4'-methoxyflavan has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), which is an international scientific advisory body that assesses the safety of food additives and contaminants. According to the JECFA database entry for this compound (JECFA number 2170), the committee concluded that there is no safety concern at current levels of intake when it is used as a flavouring agent, based on evaluations conducted in 2012. This conclusion reflects a review of available toxicological information and dietary exposure considerations by JECFA and is documented in the WHO food additives series and relevant technical report series. The absence of a numerical acceptable daily intake (ADI) value in the JECFA listing indicates that, under the conditions of intended use assessed, the compound did not raise safety issues that warranted a specific numerical ADI. In the United States, flavouring agents are cataloged in inventories such as the Substances Added to Food (formerly EAFUS) and are subject to review by expert panels like the Flavor and Extract Manufacturers Association (FEMA) Expert Panel for generally recognized as safe (GRAS) status under intended conditions of use. Listings for this compound in flavour libraries indicate its classification as a flavouring substance with a FEMA reference number, suggesting industry recognition of its sensory utility, although specific FDA CFR sections explicitly approving its use are not readily identifiable in current regulatory codifications. This means that explicit approval status by the U.S. Food and Drug Administration (FDA) may not be clearly defined in consolidated regulations available publicly, and professional regulatory consultation is often used by manufacturers to confirm appropriate usage limits and compliance pathways. In the European Union, flavouring substances are regulated under the framework that includes Commission Implementing Regulation (EU) on flavourings and food ingredients with flavouring properties. Compounds evaluated by international bodies may be considered within the context of EU flavouring inventories and safety assessments, but specific E-number assignments or explicit regulatory text for 3',7-Dihydroxy-4'-methoxyflavan are not published in widely accessible EU flavouring lists. As such, the regulatory status in regions like the EU often relies on alignment with international evaluations and industry-submitted data supporting safe use in food products. Overall, the regulatory landscape for this compound combines international expert evaluations with national and regional inventories, and manufacturers typically reference these evaluations along with flavour library listings when determining compliance with food additive regulations in specific markets.
Taste And Functional Properties
3',7-Dihydroxy-4'-methoxyflavan is described in flavour ingredient databases as having a sweet-type odor and flavour profile, indicating that it contributes to the sensory attributes of sweetness and pleasant aroma in food applications. These organoleptic properties make it suitable for use as a flavouring agent in formulations where enhancement of sweetness perception or modulation of flavour balance is desired. Sensory profiles of such compounds are typically determined through trained sensory panels and analytical evaluations that assess how the compound interacts with other ingredients in a matrix. From a functional standpoint, compounds in the flavan class often exhibit limited solubility in water but can dissolve more readily in alcohol or other organic solvents, which influences how they are incorporated into food and beverage systems. Their stability under typical processing conditions, such as moderate heat or pH variations, affects their performance in different product categories. For example, the relative stability of this compound to temperature and pH ensures that its sensory contributions persist through processes like baking, pasteurization, or bottling when used within appropriate formulation guidelines. Functional properties also encompass interaction with other flavour components; compounds with sweet-type attributes can synergize with other flavouring agents or sweeteners, enhancing overall sweetness perception without increasing caloric content. The physicochemical characteristics of 3',7-Dihydroxy-4'-methoxyflavan, including its aromatic ring system and substituent pattern, contribute to its sensory and functional behavior. The presence of hydroxy and methoxy groups affects its aroma profile and interaction with olfactory receptors, while its molecular structure influences solubility, volatility, and compatibility with other ingredients. As with many flavouring agents, the sensory impact of this compound depends on concentration, food matrix, and the presence of other volatile and non-volatile components. Functional applications are determined by empirical testing during formulation development to ensure that the desired sensory outcome is achieved consistently.
Acceptable Daily Intake Explained
Acceptable daily intake (ADI) is a toxicological concept used by regulatory and expert bodies to describe the amount of a substance that can be ingested daily over a lifetime without appreciable health risk. It is typically expressed in milligrams of substance per kilogram of body weight per day (mg/kg bw/day) and is derived from experimental data obtained in animal studies, human data where available, and application of safety factors to account for interspecies differences and variability within human populations. For some flavouring agents, a numerical ADI is established when sufficient toxicological data allow for the identification of a no-observed-adverse-effect-level (NOAEL) or similar point of departure. Safety factors are then applied to that point to derive an ADI that incorporates a margin of safety. However, for many flavouring substances, including 3',7-Dihydroxy-4'-methoxyflavan, JECFA has concluded that there is no safety concern at current levels of intake based on the body of evidence available and typical usage patterns. In such cases, instead of assigning a specific numeric ADI, the conclusion communicates that exposures from anticipated use levels are low enough relative to any potential hazards that they do not present a significant health risk. This type of conclusion reflects a qualitative safety assessment indicating that normal consumption patterns do not raise concerns without defining a numerical intake limit. It is important to recognize that the absence of a numeric ADI does not imply that unlimited consumption is safe. Rather, it reflects the outcome of expert review in which typical dietary exposures were considered in the context of toxicological data and found to be within safe boundaries. The concept of ADI helps frame regulatory decisions and communicate the level of confidence that a substance can be used safely under specified conditions. Consumers and industry stakeholders can interpret statements about safety assessments in terms of relative risk and typical exposure rather than as prescriptive intake recommendations for individuals.
Comparison With Similar Additives
When comparing 3',7-Dihydroxy-4'-methoxyflavan with other flavouring agents, it is useful to consider compounds with similar functional uses such as other sweet-type flavour enhancers and flavonoid-derived flavouring substances. For example, compounds like neohesperidin dihydrochalcone, which is used as a sweetener and flavour enhancer in foods, have been extensively evaluated by regulatory bodies and assigned numerical acceptable daily intake values reflecting their safety profiles under typical use conditions. Neohesperidin dihydrochalcone has documented regulatory approvals and defined sensory applications, and it is known for its strong sweetness potency relative to sucrose. In contrast, 3',7-Dihydroxy-4'-methoxyflavan is characterized more by its contribution to flavour balance and sweetness enhancement at low levels rather than as a primary sweetener. Another related group of flavouring compounds includes various hydroxy- and methoxy-substituted phenyl derivatives evaluated as part of flavouring agent inventories. These substances often share structural motifs with 3',7-Dihydroxy-4'-methoxyflavan, such as aromatic rings with substituted functional groups that influence their aroma and taste profiles. Regulatory assessments for such compounds consider both structure-activity relationships and available toxicological data to determine safety at intended use levels. The conclusion of no safety concern for 3',7-Dihydroxy-4'-methoxyflavan aligns with outcomes seen for many compounds in this category when used within defined flavouring applications, although specific regulatory treatment and numerical intake guidance may vary based on the extent of data and evaluation frameworks. In practice, formulators select flavouring agents based on sensory requirements, regulatory status, and compatibility with other ingredients to achieve the desired balance of taste, aroma, and safety in finished products.
Common Food Applications Narrative
Food manufacturers and flavour scientists use a wide array of flavouring agents to achieve desired sensory experiences in finished products, and 3',7-Dihydroxy-4'-methoxyflavan is one such compound that can be incorporated into flavour blends to impart or enhance sweet-type and aromatic characteristics. In broad terms, this additive finds application in product categories where subtle sweetness and flavour enhancement support consumer expectations for taste and overall enjoyment. For example, in bakery products such as cakes, cookies, and pastries, flavouring agents are used to round out sweetness and add depth to complex flavour profiles, helping baked goods deliver a consistent sensory experience from batch to batch. In beverage applications, particularly nonalcoholic drinks, the inclusion of compounds with sweet-type attributes can complement natural flavours and harmonize the sweetness profile without necessitating excessive sugar additions. Confectionery products such as hard candies, gummies, and chewing gums also benefit from carefully balanced flavour systems, where agents like 3',7-Dihydroxy-4'-methoxyflavan can contribute to the perception of sweetness and aromatic complexity, enhancing consumer appeal. Dairy-based desserts, including ice creams and frozen yogurts, often incorporate flavour enhancers to balance the dairy base and added sweeteners, creating a nuanced sensory profile that aligns with consumer taste preferences. In snack foods and ready-to-eat items, flavourings play a critical role in differentiating products and creating memorable taste experiences; sweet-type flavouring agents are blended with other ingredients to achieve targeted flavour identities that resonate with specific market segments. In addition, sauces, dressings, and condiments may utilize flavour enhancers to support overall flavour impact, particularly when product formulations aim to reduce salt or sugar content while maintaining palatability. The versatility of flavouring agents such as 3',7-Dihydroxy-4'-methoxyflavan allows them to be used across a range of categories where sensory balance and consumer acceptance are paramount. Throughout these applications, flavour scientists consider the compound's sensory properties, functional compatibility with other ingredients, and regulatory status to ensure that its use aligns with safety guidance and desired product characteristics.
Safety & Regulations
FDA
- Notes: Specific FDA approval status is not clearly identifiable in current CFR listings; use as flavouring agent may rely on inventory status and expert panel evaluations.
EFSA
- Notes: No explicit EFSA evaluation with numeric ADI was identified in referenced authoritative sources.
JECFA
- Year: 2012
- Notes: JECFA concluded no safety concern at current intake levels; no numeric ADI was assigned.
- Adi Display: No safety concern at current levels of intake when used as a flavouring agent
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