CIS-3-HEXEN-1-OL
CIS-3-HEXEN-1-OL is a colorless, grassy-green smelling organic compound used as a flavoring agent or adjuvant in food products, permitted under specified regulatory conditions.
What It Is
CIS-3-HEXEN-1-OL is a defined organic compound with the Chemical Abstracts Service (CAS) number 928-96-1, widely recognized in scientific and regulatory contexts as a flavoring agent or adjuvant used in food formulations. Chemically, it is classified as a primary alcohol with a cis configuration around the double bond (the (3Z) form), and is widely referred to in the flavor industry and scientific literature as "leaf alcohol" due to its characteristic fresh grassy-green aroma when perceived by smell receptors. The compound belongs to a broader class of volatile organic molecules that contribute to the flavor and aroma profiles of many fresh fruits, vegetables, and plant-derived ingredients. It is used to impart or enhance specific sensory characteristics in food products where a fresh, green, or herbaceous note is desired. CIS-3-HEXEN-1-OL also appears in regulatory contexts under the Flavor and Extract Manufacturers Association (FEMA) flavor library with number 2563, indicating its recognition by a major expert panel used in U.S. regulatory assessments for flavor ingredients including evaluation of safety when used as intended. In addition, it is listed in certain food additive regulations under Section 172.515 of the U.S. Food and Drug Administration (FDA) Code of Federal Regulations, which covers synthetic flavoring substances and adjuvants that may be safely used in foods when used in accordance with good manufacturing practice requirements. The compound’s inclusion in these regulatory frameworks reflects its historical use and evaluation within the flavoring industry and food regulatory systems. The compound’s identity, synonyms, and technical classification are documented across multiple authoritative chemical databases and regulatory information sources, providing a consistent basis for understanding its role in food science.
How It Is Made
The manufacture of CIS-3-HEXEN-1-OL involves chemical synthesis processes that yield the cis-configured alcohol with high purity for use in flavor applications. Organic synthesis routes typically start from hydrocarbon precursors that contain a six-carbon backbone and a site suitable for introduction of a hydroxyl (OH) functional group. One common approach involves hydrogenation of a precursor such as 3-hexyn-1-ol under controlled catalytic conditions that promote selective formation of the cis (or (Z) double bond configuration, producing CIS-3-HEXEN-1-OL with minimal formation of the trans isomer. Alternative synthetic routes can involve multi-step organic reactions where unsaturated intermediates are functionalized and then subjected to catalytic hydrogenation or reduction steps. In industrial and research-grade synthesis, catalysts such as palladium or other transition metals under controlled hydrogen pressure and temperature are used to achieve the targeted stereochemistry. The process is designed to minimize side reactions and is followed by purification steps such as distillation or chromatography to isolate the desired cis isomer with a specified assay or purity level. For flavor applications, manufacturers often aim for a high minimum assay of the target compound so that its sensory impact can be reliably predicted and controlled in formulation. Because CIS-3-HEXEN-1-OL is volatile and thermally labile, careful temperature control during both synthesis and purification is necessary to preserve its integrity and sensory properties. The output of these manufacturing processes is typically a clear, colorless oily liquid that has a strong grassy-green aroma. Quality control measures in production ensure that the compound meets specifications for use in food and beverage flavor formulations or in fragrance applications. The substance’s relatively low molecular weight and ability to dissolve in organic solvents such as ethanol or propylene glycol make it compatible with many flavor delivery systems, although it is only very slightly soluble in water. Manufacturers producing this compound must adhere to appropriate regulatory and safety guidelines to ensure that production facilities, worker exposure, and waste handling meet applicable chemical safety standards.
Why It Is Used In Food
CIS-3-HEXEN-1-OL is used in food primarily as a flavoring agent to provide or enhance fresh, green, and herbaceous scent and taste qualities. In the context of food chemistry and sensory science, flavour and aroma compounds like CIS-3-HEXEN-1-OL contribute significantly to the way consumers perceive freshness in plant-based foods, beverages, and prepared products. Its characteristic grassy-green profile adds complexity and perceived naturalness to fruit, vegetable, herbal, and botanical flavor profiles. Flavor chemists and product formulators incorporate this compound in minute quantities to achieve desired sensory effects without overpowering other flavor notes. For instance, formulations aiming to replicate the taste of fresh-cut grass, green apples, herbs like basil or mint, or the nuanced top notes of certain beverages or snacks frequently rely on compounds like CIS-3-HEXEN-1-OL because of its unique olfactory contribution. Its use is particularly relevant in beverages, confectionery, baked goods, and savory items where a green or plant-derived note can balance sweetness or other dominant flavors. Additionally, CIS-3-HEXEN-1-OL functions as a component in flavor blends where synergistic effects with esters, aldehydes, and other alcohols amplify certain sensory attributes. The inclusion of this compound helps simulate or reinforce the sensory impression of freshly harvested raw materials. Because of its volatility and low odor threshold, only small amounts are generally needed to achieve significant sensory impact, making it efficient in formulation from both sensory and cost perspectives. The compound’s role as an adjuvant in flavor systems underscores its function not as a standalone taste agent but as an enhancer that interacts with other ingredients to shape the overall flavor profile. Its use supports product differentiation in markets where consumers associate green sensory notes with quality, freshness, and naturalness. Food and beverage manufacturers leverage these characteristics to match consumer preferences in categories like natural juices, flavored waters, herbal infusions, and botanical-inspired snacks.
Adi Example Calculation
To illustrate how safety evaluations are interpreted in the context of flavoring agent exposure, consider a hypothetical scenario where a consumer regularly ingests a flavored beverage containing a small concentration of CIS-3-HEXEN-1-OL. Because the compound’s typical use levels are very low (often parts per million or lower in finished products), a consumer might ingest only microgram amounts of the compound per day. For example, if a flavored beverage contains 1 microgram of CIS-3-HEXEN-1-OL per milliliter and a typical serving is 250 milliliters, the total intake from that serving would be 250 micrograms. This level is orders of magnitude lower than doses used in toxicological studies in laboratory animals that identified thresholds associated with systemic effects. The difference between actual dietary exposure and levels associated with observed effects in controlled studies underscores why regulatory assessments conclude that there is no safety concern at normal use levels for flavoring agents like CIS-3-HEXEN-1-OL. This example is illustrative and not prescriptive; actual use levels in products vary depending on formulation goals and sensory design.
Safety And Health Research
Scientific and regulatory evaluations of CIS-3-HEXEN-1-OL focus on its safety in the context of exposure through food use as a flavoring agent rather than as a nutritive or pharmacologically active compound. Safety assessments generally consider toxicological data, metabolic pathways, and exposure levels associated with typical use in flavor formulations. Traditional toxicology evaluations by expert bodies look at endpoints such as acute toxicity, potential for irritation, and systemic effects observed in experimental studies. For example, published toxicology sources indicate that the acute oral LD50 of CIS-3-HEXEN-1-OL in laboratory animals is relatively high, suggesting low acute toxicity at exposures significantly above typical dietary levels from food use. These data points help regulators and expert panels assess margin of safety without implying direct health benefits or risks in everyday consumption. Regulatory assessments by FEMA and JECFA rely on comprehensive reviews of available scientific information, including studies on metabolism, distribution, and excretion of the compound when ingested at levels relevant to flavor use. Because flavoring agents like CIS-3-HEXEN-1-OL are typically used at low concentrations in foods, total dietary exposure tends to be orders of magnitude lower than levels associated with adverse effects in laboratory studies. Expert panel evaluations emphasize this distinction between sensory-level exposure and toxicity thresholds, concluding that no safety concerns arise from normal use as a flavoring substance. It is important to understand that evaluations by FEMA, FDA, and JECFA focus on safety under intended conditions of use, which include limitations on quantities and the principle of use at the minimum level necessary to achieve the desired sensory effect. Safety research does not suggest metabolic or physiological effects beyond those associated with sensory perception. Regulatory evaluations have not identified specific risks at typical exposure levels that would warrant restrictions beyond established good manufacturing practices. However, safety evaluations continue to be informed by ongoing scientific research and updates in toxicological and exposure assessment methodologies.
Regulatory Status Worldwide
Regulatory frameworks for CIS-3-HEXEN-1-OL reflect its classification as a flavoring agent and adjuvant intended for food use, rather than as a nutritive ingredient. In the United States, this compound is addressed within the U.S. Food and Drug Administration (FDA) Code of Federal Regulations under Section 172.515, which pertains to synthetic flavoring substances and adjuvants permitted for direct addition to food for human consumption when used in accordance with good manufacturing practice principles. Section 172.515 lists numerous flavoring substances and related compounds deemed safe under specified conditions of use, supporting the compound’s permitted status when employed as intended in flavor systems. This regulatory inclusion signifies recognition by the FDA that the compound may be safely used in food products under defined conditions without presenting safety concerns beyond typical exposure levels. At the national industry level in the United States, the Flavor and Extract Manufacturers Association (FEMA) lists CIS-3-HEXEN-1-OL under FEMA number 2563 within its flavor library, indicating that an expert panel has evaluated its safety as a flavor ingredient. FEMA’s assessments focus on intended use levels in food and consider scientific data to determine whether a substance is generally recognized as safe (GRAS) when used as a flavoring agent. The FEMA listing and associated references (such as usage levels and quick reference data) provide additional context for industry and regulatory stakeholders regarding safe applications and sensory profiles of the compound in formulations. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated CIS-3-HEXEN-1-OL (JECFA number 315) within its flavoring evaluations. According to the JECFA summary, the compound was reviewed and found to present no safety concern at typical intake levels associated with its use as a flavoring agent, supporting its ongoing use within global food systems. JECFA evaluations provide a scientific basis that harmonizes international understanding of safety for flavor ingredients, though the committee’s reports emphasize conditions of use and exposure rather than setting specific numeric acceptable daily intake values for many flavor compounds. In other jurisdictions such as the European Union and other countries that adopt Codex Alimentarius or similar frameworks for flavoring agents, CIS-3-HEXEN-1-OL may be permitted for use in food flavorings but does not carry a specific E-number like additives with broader technological functions (such as preservatives or colorants). Rather, it falls under flavoring regulations that focus on characterization and usage conditions. The regulatory landscape for flavoring agents emphasizes sensory functionality and safe use practices rather than strict numeric use limits, provided that manufacturing follows good practices and the compound is present only at levels required for intended flavoring effects.
Taste And Functional Properties
CIS-3-HEXEN-1-OL is distinguished by its sensory properties, which include an intense, fresh, grassy-green aroma reminiscent of freshly cut grass, leafy vegetation, and green herbs. These sensory properties arise from the compound’s volatile nature and specific molecular structure, which interacts with human olfactory receptors to produce a green note that is often described as herbal, grassy, or green-fruity in character. This makes it a valuable component in flavor systems where such sensory qualities are desired. In addition to its aroma properties, CIS-3-HEXEN-1-OL contributes subtle taste interactions in complex flavor matrices, often enhancing the perception of freshness or naturalness. Although it is primarily perceived through smell rather than taste, its presence can influence flavor perception when combined with other taste-active compounds. In formulations, it can balance sweeter or more acidic components by adding a verdant top note that broadens the sensory profile. Functional properties of CIS-3-HEXEN-1-OL in food systems are also tied to its physicochemical behavior. The compound is more soluble in organic solvents such as ethanol and propylene glycol than in water, which influences how formulators incorporate it into aqueous-based food and beverage systems. It is typically added using solvent carriers or encapsulation techniques to ensure controlled release and uniform distribution within the final product. Its volatility and moderate stability require careful handling during processing steps such as mixing, heating, and storage to retain its sensory contributions. Stability of CIS-3-HEXEN-1-OL can vary depending on pH, temperature, and exposure to light or oxygen, necessitating formulation strategies that protect the compound until the point of consumption. This can include microencapsulation or blending with antioxidants or stabilizers that preserve its aromatic integrity. Given its functional role rather than nutritive value, the focus in product design is on achieving consistent sensory impact rather than contributing to the nutritional profile of a food.
Acceptable Daily Intake Explained
The concept of Acceptable Daily Intake (ADI) is used by regulatory and scientific bodies to describe the level of daily exposure to a food ingredient that is considered safe over a lifetime without appreciable health risk. For many flavoring agents such as CIS-3-HEXEN-1-OL, regulatory bodies like JECFA may not set a specific numeric ADI because typical exposure levels from flavor use are well below thresholds of concern identified in toxicological evaluations. Instead, such compounds are often described as having "no safety concern at current levels of intake when used as a flavouring agent," indicating that scientific assessments did not identify a need to establish a numeric ADI for general food use. In practice, this means that CIS-3-HEXEN-1-OL can be used in food products at levels that impart the intended sensory effect without exceeding exposure levels that have been associated with safety risks in experimental models. Manufacturers and formulators apply the principle of good manufacturing practice, which entails using the minimum amount of a flavoring agent necessary to achieve the desired flavor profile. This approach inherently limits consumer exposure and supports the absence of a specified ADI for this compound. Through expert evaluations, regulatory agencies incorporate available toxicological and exposure data to conclude that use of CIS-3-HEXEN-1-OL as a flavoring agent does not present a safety concern at typical levels of consumption in foods.
Comparison With Similar Additives
CIS-3-HEXEN-1-OL is one of several flavoring alcohols and volatile compounds used to craft nuanced sensory experiences in food and beverage products. It shares sensory and functional space with other green or fruity volatile compounds such as trans-2-hexenol, cis-3-hexenyl acetate, and hexanal. Trans-2-hexenol, for example, also contributes green and herbaceous sensory notes but with a slightly different odor profile that can be perceived as more fruity or less leafy compared to CIS-3-HEXEN-1-OL. Cis-3-hexenyl acetate, an ester derivative, retains the fresh green character but offers a more fruity or floral note due to its ester functional group interacting differently with olfactory receptors. Hexanal, an aldehyde, contributes green, grassy, and slightly fatty notes often associated with freshly cut grass or green leaves. Compared with these related compounds, CIS-3-HEXEN-1-OL is valued for its balance of fresh green and herbaceous qualities without leaning too far into aldehydic or overly fruity profiles. Its use can complement or enhance the sensory contributions of other volatiles when designing complex flavor blends. While trans-2-hexenol or hexanal might be used to introduce specific fruitiness or aldehydic notes, CIS-3-HEXEN-1-OL provides a stable, recognizable green signature that helps anchor a flavor profile. Because these compounds all have different sensory thresholds, volatilities, and interactions in complex matrices, formulators select combinations that achieve a targeted consumer-perceived aroma and taste. The choice among these additives depends on product category, desired sensory outcomes, and regulatory considerations for each compound in specific markets.
Common Food Applications Narrative
CIS-3-HEXEN-1-OL finds application across a wide spectrum of food and beverage products due to its ability to impart or enhance fresh, herbaceous green notes that consumers associate with natural freshness and plant-derived ingredients. In beverages, it is often used in flavored waters, soft drinks, herbal infusions, and fruit juices where a green or botanical top note can add complexity and perceived freshness to the flavor profile. These sensory qualities complement fruit-forward tastes, balancing sweetness with a crisp green character that evokes freshly harvested produce. In confectionery, the compound is incorporated into chewing gums, candies, and gummies where fruity or herbal nuances are desired. Its green-fresh sensory note can enhance the character of mint, apple, or other fruit flavors, giving these products a distinctive and appealing aroma that resonates with consumers seeking bold sensory experiences. In baked goods, formulations that seek to replicate tastes of fruits, nuts, or plant essences often incorporate CIS-3-HEXEN-1-OL to achieve natural complexity without relying solely on ingredient extracts. Savory products, including snacks and seasonings, also benefit from the inclusion of this compound, especially when producers want to convey the idea of fresh herbs. Furthermore, in dairy-based products such as flavored yogurts or cultured beverages, the addition of a green aromatic component can create innovative flavor profiles that stand out in a crowded market. Ready-to-drink teas, cold brew coffee blends with botanical infusions, and salad dressings formulated with herb-like sensory cues are additional examples where CIS-3-HEXEN-1-OL contributes to the overall flavor narrative. Manufacturers incorporate this compound based on sensory design goals and target consumer preferences. Given its potent aroma, usage levels are typically guided by good manufacturing practices that ensure the compound is present only at concentrations needed to achieve the desired sensory effect while maintaining product balance. Across these applications, CIS-3-HEXEN-1-OL supports flavor complexity and enriches the sensory landscape of foods and beverages where green, fresh, or herbal notes are valued.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 172.515
EFSA
- Notes: No specific EU E number or numeric ADI could be verified from available regulatory sources.
JECFA
- Notes: JECFA reports that there is no safety concern at typical intake levels but does not specify a numeric ADI value.
- Adi Display: No safety concern at typical intake levels when used as flavoring
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