CYCLOIONONE

CAS: 5552-30-7 FLAVORING AGENT OR ADJUVANT

Cycloionone is a synthetic flavoring agent identified by CAS 5552-30-7 used to impart woody and fruity flavor notes in food formulations.

What It Is

Cycloionone is a chemical compound used as a flavoring agent in food applications. It is identified by the Chemical Abstracts Service (CAS) registry number 5552-30-7 and is described in flavoring inventories such as the U.S. FDA Substances Added to Food listing under the name CYCLOIONONE. Its formal technical function in formulations is as a flavoring agent or adjuvant, meaning that it contributes to or modifies the sensory profile of foods rather than serving as a nutritive ingredient. The name Cycloionone encompasses a class of structurally related bicyclic compounds, and the version used in food formulations is recognized internationally in regulatory and flavor industry databases. The additive is also referenced by structural names such as 5H-1-benzopyran, 6,7,8,8a-tetrahydro-2,5,5,8a-tetramethyl-, reflecting its chemical structure. In flavor chemistry, Cycloionone is most commonly associated with woody, cedarwood, and fruit-like odor notes that can enhance the complexity of certain flavor profiles. As used in food ingredient inventories, Cycloionone is distinguished from other ionones and related compounds by its specific configuration and sensory characteristics. Because Cycloionone is primarily used at low concentrations for flavor contributions, typical analytical descriptions emphasize its organoleptic attributes, including distinct woody and fruity nuances that are leveraged in composite flavor systems. This sensory profile differentiates it from other common flavoring compounds which may be more neutral or provide alternate flavor dimensions.

How It Is Made

The production of Cycloionone involves organic synthesis methods typical for flavor and fragrance chemicals. Although specific industrial proprietary processes are not publicly detailed in regulatory summaries, general flavor ingredient manufacture typically begins with precursor molecules derived from terpenoid or other aromatic building blocks. Industrial synthesis routes for Cycloionone often involve cyclization and controlled reduction steps to yield the bicyclic core structure with multiple methyl substituents, ensuring a consistent sensory profile and purity appropriate for food use. Manufacturers of flavoring agents like Cycloionone adhere to quality specifications and purity criteria to ensure that the compound meets food-grade standards. These specifications are documented in flavor industry reference libraries and by trade associations, which include criteria for identity and purity for flavoring substances. Production facilities that specialize in aroma chemicals often implement stringent analytical controls using chromatographic and spectroscopic methods to confirm the composition and absence of undesirable impurities. From a practical standpoint, flavor chemists and ingredient producers may tailor the synthesis and purification conditions to balance yield, sensory quality, and compliance with regulatory guidelines. Because flavoring agents are used at low concentrations in food and beverage applications, achieving high purity while maintaining characteristic odor and flavor qualities is a central focus in ingredient processing.

Why It Is Used In Food

Cycloionone is used in food primarily for its contribution to flavor complexity. As a flavoring agent, it provides woody, cedarwood, and subtle fruity notes that can enhance or round out the sensory profile of various foods. In modern flavor design, specific compounds like Cycloionone are selected to provide distinctive nuances that natural ingredients alone may not supply in a consistent or scalable way. In many composite flavors, particularly those aiming to evoke berry, fruit, or woody profiles, Cycloionone is valued for its ability to impart depth and character. When combined with other flavor compounds, it can help create balanced sensory impressions that resonate with consumer expectations. Its role as an adjuvant is to support the overall flavor blend rather than to dominate, enabling nuanced adjustments to taste and aroma in applications ranging from confectionery to beverages. Flavoring agents like Cycloionone are also chosen for their stability under typical food processing conditions. While each flavor compound has its own sensitivity profile to heat, pH, and storage conditions, those used widely in industry are selected because they maintain their sensory properties throughout manufacturing, packaging, and shelf life. This functional reliability makes Cycloionone a useful tool in the flavorist's repertoire, particularly when designing flavor systems that must remain consistent across batches and over time.

Adi Example Calculation

To illustrate how acceptable daily intake concepts operate, consider a hypothetical compound with a numeric ADI established by a regulatory authority. If, for example, a flavoring agent had an ADI of X mg per kilogram of body weight per day, a person weighing 70 kilograms could theoretically consume up to 70 times X mg of that compound daily without expected health risk. In contrast, flavoring agents like Cycloionone are used at levels where total dietary exposure is typically measured in micrograms per day rather than milligrams, meaning actual intake is orders of magnitude below hypothetical limits. While this example references a general framework, specific numeric values are not assigned here for Cycloionone because regulatory summaries describe qualitative safety conclusions rather than explicit numeric ADIs. Nonetheless, this example demonstrates how intake estimates and body weight considerations are used to understand safety margins for flavoring agents. The key point in such calculations is that typical exposures from food use are very low relative to thresholds identified through toxicological evaluation.

Safety And Health Research

Regulatory scientific committees evaluate food flavoring substances like Cycloionone based on toxicological data, exposure estimates, and structure-activity considerations. These evaluations typically examine endpoints such as genotoxicity, subchronic toxicity, and metabolic fate to determine whether a compound poses safety concerns at levels of intake associated with typical use in foods. For Cycloionone, expert bodies such as JECFA concluded that there is no safety concern at current levels of intake when used as a flavoring agent, reflecting an assessment of available evidence supporting safe use in the intended context. Safety research for flavoring agents generally includes a review of available animal studies, in vitro assays, and estimates of dietary exposure. Because flavoring compounds are used at low concentrations in food, typical exposure levels are orders of magnitude below doses associated with adverse effects in experimental systems. However, comprehensive toxicology profiles specific to each compound may vary depending on data availability, and regulators often use conservative assumptions when data are limited. The safety evaluation process also considers structural analogues and metabolism. If a flavoring compound is expected to be rapidly metabolized to innocuous products and lacks structural alerts for genotoxicity, regulatory panels may conclude that intake at typical levels does not pose appreciable risk. In cases where data gaps exist, evaluators may recommend further studies or limit use to conditions where exposure remains low. Continued monitoring of scientific evidence and post-market data contributes to ongoing assessment of safety for flavoring agents in food.

Regulatory Status Worldwide

Cycloionone appears in regulatory and industry inventories that track flavoring substances permitted or recognized for use in food products. For example, the U.S. Food and Drug Administration’s Substances Added to Food (formerly EAFUS) listing includes Cycloionone with CAS 5552-30-7 as a flavoring agent or adjuvant, indicating that it is recognized in the context of food ingredient inventories and flavor use categories. This listing also references trade association evaluations and expert panels that consider general recognition of safety for flavoring substances. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated Cycloionone as a flavoring substance under evaluation number 1239. JECFA’s summary evaluations have concluded that there is no safety concern at current levels of intake when used as a flavoring agent, based on expert review of available data. While specific numeric acceptable daily intake values are not established in the summaries available, the qualitative conclusion supports the compound’s continued use within customary flavoring practices. In the European Union, flavoring substances undergo group-based evaluations by the European Food Safety Authority (EFSA) and are included in Union lists of permitted flavorings under relevant food regulations. EFSA’s evaluation programs assess structural and metabolic classes of flavoring agents using established procedures, with outcomes that inform whether substances are considered of no safety concern at typical levels of intake. Cycloionone’s inclusion in industry flavor libraries and links to group evaluations suggests it is part of the broader regulatory framework for flavoring substances in food, although specific EU regulatory codes or conditions of use for Cycloionone itself are not readily identifiable in public summaries.

Taste And Functional Properties

Cycloionone is recognized in flavor chemistry for its distinct woody and cedarwood-like sensory notes, which may also carry nuanced fruity undertones when perceived at low concentrations. These sensory attributes make it a valuable component in flavor formulations designed to evoke natural complexity or to mimic aspects of fruit and botanical profiles. The perception of taste and aroma from Cycloionone is driven by its interactions with olfactory receptors in the nose, contributing primarily to aroma quality rather than basic taste sensations on the tongue. Functionally, Cycloionone exhibits characteristics typical of volatile flavoring agents. It is generally soluble in alcohol and compatible with many solvent systems used in flavor concentrates, which facilitates its integration into complex mixtures. Its volatility and sensory impact must be calibrated carefully in formulation, as compounds with strong odors can overwhelm other ingredients if used excessively. Flavorists therefore work within established use levels based on sensory evaluation data and regulatory guidance to achieve the desired effect without imparting off-notes or overpowering the overall flavor balance. In food matrices, the functional behavior of Cycloionone can also be influenced by factors such as fat content, processing temperature, and packaging. Because aroma compounds can interact with food components and headspace during storage, understanding these interactions is important for predicting how the final product will present to consumers. In applications such as beverages, confectionery, and baked goods, Cycloionone’s sensory contribution must be considered alongside other formulation variables to ensure a harmonious and appealing flavor outcome.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory concept used by food safety authorities to describe the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on available scientific data and applying safety factors. For many flavoring agents, including Cycloionone, regulatory expert committees may conclude that conventional intake levels are below thresholds of concern without formally assigning a numeric ADI. In such cases, the flavoring is considered safe at customary use levels because exposure is low relative to any levels associated with adverse effects. The ADI concept is rooted in toxicology studies where the highest dose without observed adverse effects (NOAEL) in experimental animals is identified and divided by factors to account for uncertainty and variability between species and human populations. This conservative approach aims to protect sensitive individuals and provides a reference value for regulatory decisions and risk assessments. For flavoring compounds like Cycloionone that are used at trace levels in food, typical dietary exposure is far below levels that would raise concern based on toxicological evaluations. When regulatory panels describe no safety concern at estimated levels of intake, it reflects a judgment that the compound’s use conforms with established safety principles, and formal numeric ADIs may not be deemed necessary or specified.

Comparison With Similar Additives

Cycloionone can be compared with other flavoring agents that provide woody, floral, or fruity sensory attributes. For example, ionone derivatives such as alpha-ionone and beta-ionone are also used in flavor and fragrance applications to impart violet, woody, or fruity nuances. These structurally related compounds share sensory profiles but may differ in volatility, intensity, and regulatory status. Comparing these flavoring agents highlights how subtle structural differences can influence sensory character and functional behavior in formulations. In addition, molecules like damascones and raspberry ketone are used in flavor systems to convey fruity and berry-like notes. While their sensory profiles may overlap with aspects of Cycloionone’s character, each compound has distinct nuances that flavorists exploit to achieve specific aromatic signatures. Damascones tend to emphasize floral and fruity dimensions, whereas Cycloionone’s woody undertones contribute depth and complementary complexity. From a regulatory perspective, many flavoring agents undergo similar safety evaluations based on structure and typical intake levels. Evaluations consider whether a compound and its analogues raise any genotoxicity concerns or whether metabolic pathways efficiently detoxify the substance. Understanding these comparative frameworks helps flavor chemists and safety professionals navigate ingredient selection and compliance across markets.

Common Food Applications Narrative

Cycloionone is incorporated into a range of flavored foods and beverages where specific woody or fruity nuances are desired. In beverage formulations, such as certain fruit-flavored drinks or specialty teas, Cycloionone can deepen the aromatic profile and contribute to the perception of ripe or complex flavor notes. Similarly, in confectionery, including candies and chewing gum, it can be part of a larger flavor blend that enhances fruit or botanical impressions. In bakery products, such as flavored breads or pastries, small amounts of Cycloionone may be used to enrich the overall aroma profile without overtly altering the primary flavor. Its subtle woody and fruit-like characteristics can complement sweet or spice notes, adding dimension to the sensory experience. Cycloionone may also find use in dairy-based desserts, syrups, and sauces where nuanced aromatic enhancement is needed. Because flavor formulations often consist of dozens of individual compounds working together, Cycloionone typically plays a supporting role rather than being the primary flavor driver. Flavorists leverage its attributes in combination with other compounds to achieve a balanced and appealing profile that meets consumer expectations for complexity and depth. Its use is guided by sensory evaluation and regulatory considerations to ensure that the final flavored product delivers a consistent and enjoyable experience across production batches.

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Safety & Regulations

FDA

  • Notes: Not specifically listed in CFR sections with numeric approvals, but included in Substances Added to Food inventory indicating recognized use as flavoring agent without specific CFR numeric citation.

EFSA

  • Notes: EFSA evaluates flavoring substances in group evaluations; specific numeric ADI not readily identified in public summaries for Cycloionone.

JECFA

  • Notes: JECFA concluded no safety concern at usual intake levels based on expert evaluations but did not list a numeric ADI value on summary pages.

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