BISABOLENE

CAS: 495-62-5 ANTIMICROBIAL AGENT, FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

Bisabolene is a naturally occurring sesquiterpene used as a flavoring agent and aroma compound with antimicrobial and flavor-enhancing properties.

What It Is

Bisabolene is a naturally occurring chemical compound classified within the class of sesquiterpenes, a group of hydrocarbons built from three isoprene units. The term "sesquiterpene" reflects its chemical origin from fifteen carbon atoms arranged in structures that can be linear, bicyclic, or monocyclic. In the context of food and flavor applications, "BISABOLENE" refers to the gamma isomer of this class with the Chemical Abstracts Service (CAS) Registry Number 495-62-5 and multiple synonymous structural names. The compound has a characteristic warm, sweet-spicy-balsamic aroma, which makes it useful in flavor and fragrance applications. Although it is not assigned an International Numbering System (INS) number for food additives in many jurisdictions, Bisabolene is recognized for its use as an antimicrobial agent, flavor enhancer, and flavoring adjuvant in various formulations. Sesquiterpenes like Bisabolene are widespread in nature, particularly in essential oils derived from plants. In these contexts they act as volatile organic compounds that contribute to the unique flavor and aroma profiles of herbs, spices, flowers, and fruits. The presence of Bisabolene in these natural mixtures contributes to woody, citrus, fruity, and balsamic sensory characteristics that are desirable in both food flavors and perfumes. The use of Bisabolene in food-related applications is primarily driven by its organoleptic properties, meaning that its contribution to sensory perception (such as smell and taste) is a key functional attribute. Because of this, it finds applications in complex flavor blends where balance and nuance of flavor are important. Its role as an antimicrobial agent in formulations also reflects its broader chemical activity beyond sensory effects, although its antimicrobial efficacy at food-use concentrations is considered alongside sensory and safety evaluations.

How It Is Made

Bisabolene is principally obtained through extraction from natural plant materials or through chemical synthesis designed to replicate the natural compound. In nature, Bisabolene is biosynthesized by plants via the mevalonate pathway, which constructs the carbon skeleton of the sesquiterpene from smaller isoprene building blocks. This biosynthetic process occurs in specialized plant tissues such as glandular trichomes, resin canals, or oil glands where volatile organic compounds are produced and stored. For industrial applications, Bisabolene can be isolated from essential oils of plants like lavender, ginger, citrus peels, or myrrh where it occurs alongside other terpenes. Steam distillation and solvent extraction are common techniques used to separate Bisabolene-rich fractions from botanical material. The choice of extraction method depends on the plant source and the desired purity. In addition to direct extraction, Bisabolene can be produced via chemical synthesis, often starting from simpler terpene feedstocks or through targeted organic reactions that construct the sesquiterpene carbon framework. Chemical synthesis enables production at scale and allows for consistent quality and isomer composition, which is important when used in commercial flavoring or antimicrobial applications. Manufacturers aiming for food-grade quality must comply with relevant purity and specification standards. These standards generally require that Bisabolene be free from contaminants that could pose safety concerns. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) provides specifications for Bisabolene as a flavoring agent, reflecting criteria for identity and purity used in regulatory safety evaluations. The production process, whether from natural extraction or synthesis, is optimized to meet these specifications so that the final material is suitable for intended uses in flavor and aroma applications. Overall, the industrial supply of Bisabolene involves combining traditional botanical extraction techniques with modern chemical synthesis and purification methods. This ensures that the compound can be used reliably in flavor and fragrance industries with predictable sensory and functional profiles.

Why It Is Used In Food

Bisabolene is used in food and flavor applications because of its desirable sensory properties and multifunctional roles. As a volatile compound with a warm, sweet-spicy-balsamic aroma profile, Bisabolene contributes to complex flavor blends, especially where woody, citrus, fruity, or balsamic notes are desired. These sensory effects help food formulators balance and enhance the overall flavor quality of products such as beverages, confectioneries, and savory applications. In addition to contributing to flavor complexity, Bisabolene acts as a flavor enhancer and adjuvant. As a flavor enhancer, it can increase the perception of other flavor components in a mixture, helping to create more robust or intensified taste profiles without the need for higher levels of other ingredients. Flavor adjuvants like Bisabolene are chosen when subtle effects on flavor perception are necessary to achieve a specific sensory goal, such as rounding off sharp notes or smoothing flavor transitions in complex blends. Bisabolene also has antimicrobial properties, which can contribute to functional formulations in products where aroma compounds may play a secondary role in inhibiting microbial growth on surfaces or within specific delivery systems. While its antimicrobial activity is part of broader functional chemistry, the primary driver for its use in food and beverage contexts remains its contribution to flavor and aroma. Flavor chemists value Bisabolene for its versatility; it can be combined with other terpenes, aldehydes, and esters to build distinctive profiles that appeal to consumers. The choice to use Bisabolene typically reflects a need to fine-tune sensory experiences or to deliver specific aromatic qualities that other compounds alone cannot achieve.

Adi Example Calculation

Because a specific numeric Acceptable Daily Intake (ADI) was not established by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) for Bisabolene, an illustrative calculation using a numeric ADI cannot be provided. The absence of a specified numeric ADI reflects that JECFA concluded there is no safety concern at current levels of intake when Bisabolene is used as a flavoring agent, rather than defining a quantifiable daily limit. Therefore, traditional example calculations using a body weight and numeric ADI are not applicable in this case. The focus of safety assessments remains on ensuring that typical exposures from food use remain within the context of expert evaluations that do not indicate safety concerns for normal usage patterns.

Safety And Health Research

Safety and health research for flavoring agents like Bisabolene focuses on toxicological endpoints that are relevant to human exposure through ingestion. Regulatory expert committees and scientific panels typically consider a range of studies including acute toxicity, chronic toxicity, genotoxicity, reproductive and developmental toxicity, and metabolism or pharmacokinetic data. These assessments help determine whether a compound has potential adverse effects at anticipated exposure levels. For Bisabolene, JECFA’s evaluation concluded that current levels of intake when used as a flavoring agent do not raise safety concerns, suggesting that available data do not indicate harmful effects under typical conditions of use. This conclusion is based on the cumulative evidence assessed by international experts, which considers the compound’s chemical properties, exposure potential, and any available toxicological data. (JECFA BISABOLENE evaluation summary) While antimicrobial properties are attributed to Bisabolene, such functional activity is observed in controlled settings and may not translate to significant biological effects at the low concentrations used in food applications. Research into antimicrobial properties often involves in vitro studies where Bisabolene is tested against specific microorganisms to determine inhibitory activity. These studies provide insight into the compound’s functional chemistry but do not by themselves establish direct health outcomes for consumers. Overall, the safety research context for Bisabolene involves evaluating both its inherent chemical properties and how it behaves in biological systems at exposure levels relevant to food use. Regulatory evaluations focus on ensuring that there is no evidence of hazard at levels that consumers would encounter through normal dietary intake.

Regulatory Status Worldwide

Bisabolene has been evaluated by international expert bodies for its use as a flavoring substance. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed Bisabolene under its Flavouring Agent evaluations and determined that at current levels of intake when used as a flavoring agent it does not raise safety concerns, indicating that exposure from typical uses is considered acceptable. This evaluation is documented in JECFA’s Technical Report Series, which includes summaries of safety evaluations for flavoring agents. The JECFA number assigned to Bisabolene is 1336, which identifies it within the series of flavoring agents evaluated by the committee. The JECFA evaluation does not specify a numeric Acceptable Daily Intake (ADI) but notes that safety concerns are not indicated at current intake levels when used as intended as a flavoring agent. This reflects international expert assessment of the safety of Bisabolene’s use in food-related applications under normal conditions of use. (JECFA database entry for BISABOLENE provides evaluation context) In the United States, Bisabolene appears in the FDA’s "Substances Added to Food (formerly EAFUS)" inventory, which lists substances that have been evaluated for various food uses based on available safety assessments such as those by the Flavor and Extract Manufacturers Association (FEMA) Expert Panel. Inclusion in this inventory reflects that Bisabolene has been recognized in the context of flavor use, but it does not constitute a specific approved regulation under the Code of Federal Regulations (CFR) such as a direct listing in 21 CFR Parts 172 or 173. FDA’s inventory notes that FEMA numbers and JECFA evaluations are referenced but that inclusion does not by itself indicate formal FDA approval or specific regulatory status in CFR. (FDA Substances Added to Food entry for BISABOLENE) In other jurisdictions, such as the European Union, flavoring substances are regulated under specific flavoring regulations, and Bisabolene’s safety assessment by international bodies like JECFA contributes to its standing in these regulatory frameworks. However, a specific E-number designation for Bisabolene has not been widely assigned in the EU context, and formal numerical authorizations may vary by member state or specific flavoring legislation.

Taste And Functional Properties

Bisabolene exhibits a complex sensory profile characterized by warm, sweet, woody, citrus, and balsamic notes. This sensory character arises from its sesquiterpene structure, which interacts with human olfactory receptors in ways that many simple terpenes do not. In flavor applications, Bisabolene can impart nuanced spice and citrus undertones, making it valuable in both sweet and savory flavor systems. The functional behavior of Bisabolene in food matrices depends on its physical and chemical properties. It is an oily, low-molecular-weight compound that is soluble in organic solvents and has limited water solubility. Its hydrophobic nature means that it integrates well into fat-based flavor carriers and oil-phase formulations. However, due to its limited water solubility, it may require emulsification or encapsulation in aqueous-based systems to ensure uniform distribution and stability. Bisabolene is sensitive to air and can oxidize over time if not properly protected, so its incorporation into food formulations often involves antioxidants or inert atmosphere handling to preserve aroma integrity. Heat and pH conditions can also influence its stability; excessive heat can cause volatilization or degradation, and extreme pH values may accelerate chemical changes. Therefore, food technologists consider formulation strategies that protect Bisabolene’s sensory profile throughout processing and storage. Despite these challenges, Bisabolene’s sensory contribution and role as a flavor enhancer make it a useful ingredient in systems where subtle aroma and taste effects are desired. Its integration into complex flavor blends allows it to support other aromatic compounds, enhancing the overall perception of flavor without overt dominance. This makes Bisabolene particularly useful in nuanced flavor profiles where balance and depth are important.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a numerical estimate of the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. ADIs are typically derived by regulatory bodies based on comprehensive evaluations of toxicological data, including studies in animals and humans, with safety factors applied to account for uncertainties in the data. In the case of Bisabolene, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed available evidence and concluded that at current levels of intake when used as a flavoring agent there is no safety concern, which implies that a specific numeric ADI was not established because existing exposure levels are considered within safe boundaries. This type of conclusion indicates that regulators believe typical usage does not pose appreciable risk based on current knowledge. (JECFA evaluation) It is important to understand that an ADI, when established numerically, is not a recommended consumption level but a safety benchmark that regulatory authorities use to evaluate exposure from all sources. When a numeric ADI is not specified, it signifies that the expert committee did not identify safety concerns at the levels of intake associated with intended use, rather than suggesting unrestricted consumption. ADIs incorporate conservative assumptions to ensure consumer protection, often including uncertainty factors that address differences between animals and humans and variability within human populations.

Comparison With Similar Additives

Bisabolene can be compared with other flavoring terpenes that are used to impart sensory characteristics and functional effects in food applications. For example, limonene is another terpene commonly used in citrus-flavored products due to its bright, citrus aroma. Both Bisabolene and limonene contribute aromatic qualities, but limonene tends to offer a more overt citrus note while Bisabolene provides warmer, woody, and balsamic nuances. This distinction affects how each compound is selected in flavor formulation depending on the desired sensory profile. Another related additive is myrcene, a terpene with herbal and balsamic aroma characteristics. Like Bisabolene, myrcene contributes to complex flavor systems, particularly in spice and herbal profiles. However, myrcene’s aroma may be perceived as greener or more resinous compared to Bisabolene’s warmer balsamic tone. Both compounds can support multi-faceted flavor blends when used with other terpenes, but Bisabolene’s specific organoleptic properties make it suitable for applications that emphasize depth and warmth. Finally, alpha-pinene is a terpene known for its pine-like aroma that is often used in conifer or herbal flavor systems. Compared to Bisabolene, alpha-pinene conveys sharper, more distinct notes that can dominate simpler profiles. When formulating balanced flavors, Bisabolene’s subtler characteristics can complement sharper terpenes like alpha-pinene and limonene to achieve a rounded sensory experience. These comparisons highlight how different terpenes are chosen based on their individual sensory footprints and how they function in concert with other flavoring agents.

Common Food Applications Narrative

Bisabolene is encountered in a variety of food and beverage applications where sophisticated aroma and flavor characteristics are required. As a component of flavor blends, it is often selected for products that benefit from woody, citrus, and balsamic sensory notes. For example, in fruit-flavored beverages or candies, Bisabolene’s warm aromatic profile can complement citrus and berry notes to create a more rounded and engaging taste experience. Its use helps to create distinctive signatures that consumers associate with high-quality flavor experiences. In savory applications such as sauces and spice blends, Bisabolene can contribute depth and complexity that enhance the overall flavor profile. In these contexts, its woody and slightly sweet characteristics help balance sharper or more acidic taste components. Bisabolene’s use in confectionery and bakery products often centers on its ability to support fruity and spice flavor notes, adding subtle balsamic tones that make products more appealing without overpowering the primary flavor focus. Flavor professionals also employ Bisabolene in natural and botanical flavor systems, such as those based on citrus, herbal, or spice extracts. Its compatibility with other terpenes and aroma compounds allows it to be a component of complex blends that mimic the sensory profiles of natural ingredients. By doing so, Bisabolene helps formulators achieve sensory experiences that align with consumer expectations for products labeled with natural or botanical flavors. Overall, Bisabolene’s role in food applications is centred on its ability to enhance and round out flavor profiles in beverages, confectioneries, savory products, and botanical blends. Its integration into these products reflects the needs of food developers to deliver engaging sensory experiences that resonate with consumer preferences for depth, balance, and aromatic appeal.

Safety & Regulations

FDA

  • Notes: Inclusion in the FDA Substances Added to Food inventory does not itself confer formal FDA approved status in the CFR; specific regulations are not identified.

EFSA

  • Notes: No specific EFSA numerical ADI or E number assignment could be confirmed from authoritative sources.

JECFA

  • Year: 2004
  • Notes: JECFA concluded no safety concern at current levels of intake; a numeric ADI was not specified.

Sources

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