STEARYL ALCOHOL

CAS: 112-92-5 SURFACE-FINISHING AGENT, TEXTURIZER

Stearyl Alcohol (CAS 112-92-5) is a long-chain fatty alcohol used as a surface-finishing agent and texturizer in foods, cosmetics and industrial applications. It serves technological functions including emulsification and texture modification.

What It Is

Stearyl Alcohol, known chemically as 1-octadecanol and listed under CAS number 112-92-5, is a saturated long-chain fatty alcohol derived from stearic acid. It belongs to the class of fatty alcohols, which are organic compounds characterized by a straight hydrocarbon chain with a terminal hydroxyl group. In regulatory contexts, stearyl alcohol is recognized for its role as a surface-finishing agent and texturizer in food systems, contributing to specific technological effects when used under good manufacturing practice conditions. Stearyl Alcohol’s structure—a linear 18-carbon chain with a single hydroxyl group—gives it amphiphilic properties, meaning it has both hydrophobic (water-repelling) and hydrophilic (water-attracting) characteristics. This dual nature underpins many of its technological applications, including its ability to interact with both water and lipid phases in formulations. Though it may occur naturally in some plant and animal fats, stearyl alcohol used in food production is typically produced by synthetic processes that ensure food-grade purity. Stearyl Alcohol is distinct from other food additives by its molecular size and functional profile. It is not classified as a nutrient but as a processing aid that may influence texture, stability, and surface properties of food products. In regulatory inventories, it is referenced by various other names including octadecanol, C18 alcohol, and 1-hydroxyoctadecane, reflecting its chemical identity and functional versatility.

How It Is Made

Stearyl Alcohol is manufactured through chemical processes that convert fatty acid derivatives into higher alcohols. One common approach involves hydrogenation of stearic acid or its esters under controlled conditions, using a catalyst to reduce the carboxyl group to an alcohol group while preserving the long hydrocarbon chain. Alternative industrial methods may start from ethyl stearate or similar precursors, which are catalytically reduced to produce the desired long-chain alcohol. The production of food-grade stearyl alcohol complies with purity standards that limit residual catalysts, unreacted materials, and other impurities. These standards ensure consistency and safety for its intended applications. Typical production controls monitor parameters such as melting point, acid value, and overall chemical identity to confirm conformity to specifications suitable for use in food contact and processing. Although the core chemistry of fatty alcohol production is well established, variations in process conditions—such as temperature, pressure, and catalyst selection—can influence yield and product quality. Manufacturers producing food-grade material operate under regulated conditions to meet relevant food safety and quality requirements. Even though detailed proprietary process steps may vary among producers, the overarching goal remains to deliver stearyl alcohol that meets food industry standards for functional performance and purity.

Why It Is Used In Food

Stearyl Alcohol is used in food systems primarily for its technological properties. Its amphiphilic structure enables it to interface between water and lipid phases, which can help stabilize emulsions, improve texture, and enhance surface characteristics of certain products. While not a nutrient, additives like stearyl alcohol perform specific roles that support consistent product quality. In formulations where texture uniformity is essential—such as coatings, icings, and certain confectionery items—Stearyl Alcohol aids in achieving smoothness and structural integrity. In these contexts, it can help disperse fats evenly and contribute to desirable mouthfeel and stability. Because it can interact with multiple components in a formulation, Stearyl Alcohol is considered a multifunctional texturizer and surface-finishing agent. Its inclusion is guided by conditions of good manufacturing practice, meaning it is added at levels just sufficient to accomplish its intended function without imparting undesirable sensory effects. The use of Stearyl Alcohol in food also aligns with processing objectives that require consistent performance across batches. In industrial food production, ingredients that reliably deliver technological effects—such as controlling surface finish or modifying texture—support scalable operations and product uniformity. While its use is specific and limited, this functional contribution allows formulators to achieve targeted quality outcomes in a range of products.

Adi Example Calculation

Because a specific numerical ADI for Stearyl Alcohol has not been reliably sourced from authoritative regulatory databases, this section illustrates how an ADI concept is applied rather than providing a numeric value for this compound. For example, if a food additive 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 milligrams daily over a lifetime without appreciable risk, according to the safety framework used by expert bodies. This calculation is strictly illustrative and does not imply that Stearyl Alcohol has a defined ADI value.

Safety And Health Research

Safety evaluations for food-related substances like Stearyl Alcohol consider the compound’s chemical properties, exposure potential, and toxicological data. Long-chain fatty alcohols such as Stearyl Alcohol generally have low acute toxicity and limited systemic absorption due to their molecular weight and structure. Toxicity data available from chemical registries and safety summaries indicate low acute toxicity in animal studies, with high oral LD50 values and minimal adverse effects at low exposure levels. These findings are consistent with the compound’s classification and functional role. Regulatory agencies and expert bodies review available toxicological evidence when determining whether a substance can be permitted for specific uses in food and food contact applications. Evaluations typically consider endpoints such as genotoxicity, chronic toxicity, reproductive and developmental effects, and potential for bioaccumulation. While exhaustive safety profiles may not be publicly available for every compound, regulatory listings and inventory inclusions reflect assessments that do not identify significant safety concerns when the substance is used under conditions of good manufacturing practice. It is important to note that safety evaluations focus on the intended use and exposure levels associated with food-related applications. Data from non-food uses, industrial contexts, or high-dose experimental settings do not directly translate to typical dietary exposures. The absence of adverse findings at relevant exposure levels supports the inclusion of Stearyl Alcohol in regulatory inventories for specified uses, but comprehensive toxicological monographs specific to this compound in the food context may not be readily available in public databases.

Regulatory Status Worldwide

In the United States, Stearyl Alcohol appears in regulatory inventories related to food contact substances and indirect additives. It is listed with references to multiple sections of Title 21 of the Code of Federal Regulations (CFR), indicating authorized use for specified food contact and processing applications. These citations include parts of 21 CFR that cover food packaging materials and components when used under conditions of good manufacturing practice. Its presence in these inventories suggests regulatory recognition of Stearyl Alcohol for specific technological uses, though it may not be a direct food additive in all contexts. 21 CFR references include provisions for its use in food contact applications and surface-finishing roles under defined circumstances. Stearyl Alcohol’s listing under these sections reflects the regulatory framework that permits its use as an indirect additive without specifying numerical limits, consistent with good manufacturing practice principles. 21 CFR can be consulted for details on conditions of use for each d section. In international contexts, organizations such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) maintain databases of food additives and related substances, though a specific JECFA evaluation entry for Stearyl Alcohol was not located in publicly available listings at the time of writing. Regulatory frameworks outside the United States may also address the use of fatty alcohols and related compounds in food contact and formulation settings, with allowances typically based on functional class and safety assessments performed by competent authorities.

Taste And Functional Properties

Stearyl Alcohol is generally described as having a bland or neutral taste, which is consistent with its chemical classification as a long-chain fatty alcohol. Because it is used in relatively small quantities and does not contribute significant flavor, its impact on the sensory profile of foods is primarily related to texture rather than taste. In applications where mouthfeel and consistency matter, Stearyl Alcohol can influence the perception of smoothness and structural uniformity without imparting a discernible flavor. Functionally, Stearyl Alcohol exhibits amphiphilic behavior. Its long hydrophobic carbon chain interacts with lipid phases, while its hydroxyl group can interact with aqueous phases. This dual affinity allows it to act as a surface-active agent in systems where dispersions or emulsions are present. However, unlike low molecular weight surfactants that primarily reduce surface tension, Stearyl Alcohol’s primary role in food is often as a texturizer or surface-finishing agent rather than a classic emulsifier. Stearyl Alcohol’s physical behavior in food formulations is influenced by its solid state at room temperature and its melting profile. It tends to be solid or wax-like under ambient conditions, which can help contribute to structure and body in products where a more substantial physical matrix is needed. Its insolubility in water and compatibility with lipid phases make it particularly useful in formulations that rely on controlled dispersion of fat-like components.

Acceptable Daily Intake Explained

The concept of an acceptable daily intake (ADI) is central to how regulators express safety thresholds for food additives. An ADI represents an estimate of the amount of a substance that can be consumed every day over a lifetime without appreciable health risk, based on available toxicological data and applying conservative safety factors. For compounds like Stearyl Alcohol, specific ADI values may not be established in all regulatory frameworks if the substance is permitted under good manufacturing practice without a numerical limit, or if formal evaluations by bodies such as JECFA have not assigned a defined ADI. When an ADI is established by an expert committee, it is derived from the most sensitive relevant toxicological endpoint observed in studies and is adjusted using uncertainty factors to account for differences between animals and humans and variability within human populations. This ensures a margin of safety that reflects conservative assumptions. In the absence of an explicitly listed ADI for Stearyl Alcohol in recognized regulatory evaluations, it is appropriate to describe the ADI as null in numeric terms in regulatory summaries, with notes indicating that a formal ADI was not found in the referenced databases at the time of writing.

Comparison With Similar Additives

Stearyl Alcohol can be compared to other long-chain fatty alcohols and emollient-type additives that serve texturizing or surface functions in food and cosmetic applications. For instance, cetyl alcohol (a C16 fatty alcohol) is similar in structure but has a shorter carbon chain, which can influence melting point and functional behavior. Both compounds are used in formulations to provide structure and stability, with cetyl alcohol sometimes preferred in systems requiring lower melting points. Another compound with related functional uses is glyceryl monostearate, a glycerol ester of stearic acid that functions as an emulsifier and stabilizer. While structurally distinct from Stearyl Alcohol, glyceryl monostearate also supports dispersion of lipid phases and contributes to textural properties. The choice between such additives depends on factors including solubility, melting profile, and regulatory status in specific applications. These comparisons highlight how different additives with related functions can be selected based on formulation needs and regulatory allowances, without implying interchangeability in all contexts.

Common Food Applications Narrative

Stearyl Alcohol finds application across a variety of food products where its functional properties contribute to consistent performance and desirable textural outcomes. In confectionery, for example, stearyl alcohol may be used to help provide a smooth surface finish or to aid in the stabilization of coatings, supporting uniform appearance and handling characteristics. Similarly, in bakery products and frostings, its presence can assist in achieving consistency in texture and surface quality. In products with multi-phase systems—such as certain dairy-based desserts or sauces that combine aqueous and lipid components—Stearyl Alcohol’s amphiphilic nature can support the stability of dispersed phases. It may help maintain product integrity during processing and storage by contributing to the cohesive structure of the formulation. Though its use levels are typically low, the impact on textural qualities can be meaningful in high-volume production settings where even subtle refinements can influence consumer perception. Stearyl Alcohol is also referenced in regulatory and industry inventories as an indirect food additive permitted for specific uses under conditions of good manufacturing practice. In packaging and food contact materials, it may be found in components that interact with food during processing, where its surface-finishing properties contribute to performance without transferring significant amounts into the food itself. Across these varied applications, the inclusion of Stearyl Alcohol reflects its role as a technological adjunct rather than a primary ingredient.

Safety & Regulations

FDA

  • Notes: Stearyl Alcohol is listed as an indirect food contact substance under multiple CFR sections reflecting permitted use under conditions of good manufacturing practice.
  • Approved: True
  • Regulation: 21 CFR parts 175-178

EFSA

  • Notes: EFSA-specific evaluation or E number assignment for Stearyl Alcohol was not located.

JECFA

  • Notes: A specific JECFA evaluation entry with ADI and year was not found in publicly accessible database.

Sources

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