BUTYL OLEATE SULFATE
Butyl oleate sulfate is a sulfated fatty acid ester permitted by US FDA as a food additive under specific conditions for dehydrating grapes to produce raisins and related uses.
What It Is
Butyl oleate sulfate is an organic compound derived from the sulfation of butyl oleate, a fatty acid ester. It is identified by the CAS number 38621-44-2 and appears under several synonyms including sulfated butyl oleate and 1-butyl (sulfooxy)-9-octadecenoate. This compound belongs to a class of sulfate esters of long-chain fatty acid derivatives that function primarily as surfactants and emulsifiers in industrial and food-contact applications. Its chemical structure features a long aliphatic tail typical of oleate esters with an added sulfooxy group that confers surface-active properties, enabling it to interact with both water and lipid phases. The compound is generally a brownish oily liquid that can form stable emulsions with water, reflecting its amphiphilic nature. Although not a naturally occurring food component, butyl oleate sulfate is used in regulated contexts where its technical functionality supports processing or coating roles under defined conditions without imparting flavors or nutritive value within foods. It is listed under US food additive regulations with specified conditions for safe and effective use in dehydrating grapes for raisin production and related applications, illustrating its role as a processing aid rather than a direct nutrient or flavoring agent. Its identification under regulatory texts emphasizes its defined composition, preparation method, and limitations to ensure safety and consistency in food applications. Regulations list it by name and CAS within sections of the Code of Federal Regulations that govern food additives and indirect food-contact substances, highlighting its recognized presence in legal frameworks for food processing aids.
How It Is Made
Butyl oleate sulfate is produced through a chemical sulfation process applied to a butyl ester mixture, predominantly butyl oleate derived from edible vegetable oils and n-butanol. In this preparation method, a mixture rich in butyl oleate, typically obtained by transesterification of triglycerides or vegetable oil with 1-butanol, is reacted with concentrated sulfuric acid to introduce the sulfooxy functional group. Following the sulfation reaction, the product mixture is subjected to a series of purification steps that commonly include washing with water to remove acidic byproducts and neutralization with aqueous sodium or potassium hydroxide to yield the sulfate ester in a more neutral form. The resulting product is then processed to meet defined compositional specifications, such as at least 90 percent butyl oleate content and limited unsaponifiable matter, to align with regulatory allowances for food applications. This method leverages well-established esterification and sulfation chemistry to convert the base ester into a functionalized surfactant-like compound. Manufacturers aim to control reaction conditions, purification, and quality parameters so that the final material meets regulatory criteria for use in food processing contexts. The production process is rooted in classical organic synthesis techniques and does not involve complex catalysts or biological systems, but it does require proper handling due to the use of strong acid and organic substrates that can pose hazards if not managed within appropriate industrial controls.
Why It Is Used In Food
Butyl oleate sulfate is incorporated into certain food processing applications because of its ability to act as an emulsifier and processing aid. Its primary role in food contexts is not to contribute flavor or nutritional value, but rather to support the physical transformation or preservation of food during processing steps. Specifically, in the US, it is permitted for use in dehydrating grapes to produce raisins where it aids in the formulation of aqueous emulsions that facilitate uniform dehydration and can help with moisture regulation or surface treatment. The sulfooxy functional group confers amphiphilic properties that help disperse or stabilize oil-in-water systems, making it useful in creating stable emulsions that can interact effectively with both hydrophilic and lipophilic phases. By enabling stable emulsions at specified inclusion levels, the additive can improve process consistency, enhance product appearance or texture during dehydration, and support controlled residue levels on finished foods. Although it is authorized under narrowly defined conditions in regulatory texts, the compound has specialized utility in industrial-scale food production where such surface-active agents can enhance the efficiency or quality of processing operations without imparting undesirable sensory attributes.
Adi Example Calculation
Because butyl oleate sulfate does not currently have an authoritative numeric ADI established by recognized bodies such as JECFA or EFSA, a specific illustrative calculation using an ADI value cannot be provided. In general, if a compound had an ADI of X mg/kg body weight, an illustrative example would show how to multiply that number by a hypothetical body weight, such as 70 kg, to estimate a maximum safe daily intake; however, without an established numeric ADI for this compound in authoritative evaluations, such computations remain speculative rather than grounded in defined regulatory criteria.
Safety And Health Research
Safety evaluations for butyl oleate sulfate focus primarily on its regulatory acceptance under specified conditions rather than on extensive independent toxicological literature for dietary exposure. The US Food and Drug Administration's inclusion of this compound in 21 CFR 172.270 as a permitted food additive is based on historical review of its technical function, manufacturing process, compositional specifications, and limits on usage and residues. Such regulatory assessments typically consider factors like potential for exposure at authorized levels, chemical identity, and functional role, but do not always provide extensive publicly accessible toxicology datasets for every specialized additive. Independent scientific studies specifically addressing chronic toxicity, genotoxicity, reproductive effects, or long-term dietary impacts for butyl oleate sulfate are not readily found in primary literature at present, and authoritative bodies like JECFA or EFSA have not published explicit evaluations or established ADIs for this compound in publicly searchable databases. As a result, broader health research gaps remain in peer-reviewed toxicology data for dietary exposure, beyond the framework of regulatory specifications that limit how and where the compound may be used. Regulatory acceptance under narrowly defined conditions reflects a determination that, when used according to prescribed specifications and limits, the compound does not pose undue safety concerns based on existing evidence and expert review.
Regulatory Status Worldwide
In the United States, butyl oleate sulfate is recognized in the Code of Federal Regulations as a permitted direct food additive under 21 CFR 172.270, which specifies that "Sulfated butyl oleate" may be safely used in food under prescribed conditions, including preparation by sulfation of butyl esters and usage in dehydrating grapes to produce raisins at defined levels. The regulation provides compositional specifications for purity and maximum inclusion rates in aqueous emulsions, as well as limits on residues remaining on finished products to ensure safety. Additionally, the compound appears in FDA inventories of indirect food additives for certain materials intended for repeated use in contact with food under 21 CFR 177.2800, reflecting its presence in regulatory frameworks governing food-contact substances. These citations establish the compound's legal context for specified uses in the US. There is limited publicly accessible evidence of approvals or assigned E-numbers under European food additive systems, and no confirmed ADI values from EFSA or JECFA are documented in available authoritative sources. Where such regulatory details are not explicitly provided in official additive lists outside the US, regulatory status may vary by jurisdiction, and independent assessments by local authorities would be required for confirmation. In all cases, documented regulations emphasize specific conditions of use, compositional requirements, and safety considerations that guide its acceptance in food processing roles.
Taste And Functional Properties
Butyl oleate sulfate, as a specialized ester of fatty acid sulfates, has physicochemical properties typical of surfactants rather than flavor molecules. It is not used for taste enhancement or sensory contributions in finished foods. Instead, its functional behavior in formulations is characterized by its amphiphilic structure that allows it to reduce interfacial tension between aqueous and lipid phases. In practical terms, this means it can facilitate the formation and stabilization of emulsions, enabling water and oil components to mix at the microscopic level. Because of its long aliphatic chain derived from oleic acid, it has a hydrophobic tail that interacts with lipid phases and a hydrophilic sulfate group that interacts with aqueous phases, supporting stable dispersions essential in certain food processing contexts. Sensory descriptors for compounds of this type generally do not highlight pleasant taste or aroma, and butyl oleate sulfate is not identified with specific flavor characteristics; any sensory presence on finished food items is governed by its low usage levels and processing function rather than by a direct taste or aromatic impact. Functional properties also include its relative stability in specific pH and temperature ranges relevant to processing, though detailed data on thermal or pH stability in food matrices is not widely documented. As a technical additive, it behaves primarily as a physical facilitator of processing rather than as a contributor to sensory profiles.
Acceptable Daily Intake Explained
An Acceptable Daily Intake (ADI) is a numerical estimate of the amount of a substance in food or water that can be ingested daily over a lifetime without appreciable health risk, expressed per kilogram of body weight. For many food additives, international bodies like JECFA or EFSA establish ADIs based on toxicological data and safety factors. In the case of butyl oleate sulfate, authoritative sources have not published an explicit numerical ADI, and therefore no specific mg/kg body weight value is available in official additive evaluation documents. Without such a defined ADI, regulatory frameworks manage potential exposure by prescribing conditions of use and residue limits in food products instead of relying on a daily intake number. This approach helps ensure exposures remain within a safe range based on the technical role and limited use cases authorized by regulators. In this context, understanding ADI as a concept helps frame why regulatory limits are placed on use levels and residues: they are intended to keep consumer exposure well below thresholds that could raise safety concerns, even in the absence of a formally quantified ADI for the compound itself.
Comparison With Similar Additives
Butyl oleate sulfate belongs to a broader class of surfactant and emulsifier-type additives used in food processing, though each compound in this class has distinct chemical structures and regulatory contexts. For example, sucrose esters of fatty acids are widely used as food emulsifiers that help stabilize oil-in-water systems, often with assigned INS numbers and evaluated safety profiles. Another compound, lecithin, is a naturally derived phospholipid with emulsifying properties and a well-characterized safety record, commonly used in baking, confectionery, and beverage formulations. Compared with these more familiar emulsifiers, butyl oleate sulfate has a narrower set of authorized uses and lacks a widely recognized E-number or extensive safety database, highlighting the specificity of its regulatory acceptance. These comparisons underscore that while functional roles like emulsification are shared across many additives, the regulatory acceptance, usage scope, and safety evaluation documentation for each substance can vary significantly depending on jurisdiction and historical use patterns.
Common Food Applications Narrative
In commercial food processing, butyl oleate sulfate finds use in specific technical roles tied to its surfactant and emulsifier properties. One of the well-documented applications under regulatory frameworks is its use in the dehydration of grapes to produce raisins. In this context, the compound can be included in aqueous emulsions that coat or interact with grapes to support controlled dehydration, improve surface interaction, and facilitate moisture removal in a consistent manner. Processing aids like butyl oleate sulfate are selected for these roles because they help manage the physical behavior of water and oil phases during treatment steps, supporting uniform product transformation without significant impact on taste or nutritional content. Beyond raisin production, similar surfactant-based additives can be useful in preparing coatings, films, or other interfaces where controlling water-lipid interactions is important in processing fruits, vegetables, or other agricultural products for extended shelf life or specific texture outcomes. These applications illustrate a broader pattern in food technology where specialized additives are employed not for direct enhancement of flavor or appearance in the final consumer product, but rather to ensure consistent processing conditions and product quality at industrial scales. Because usage levels and conditions are narrowly specified in regulatory texts, processors must adhere to definitions and limits to ensure compliance and maintain food safety standards.
Safety & Regulations
FDA
- Approved: True
- Regulation: 21 CFR 172.270
EFSA
- Notes: No authoritative EFSA evaluation or E number readily found
JECFA
- Notes: No specific JECFA ADI or INS number published
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