ALLYL THIOPROPIONATE

CAS: 41820-22-8 FLAVORING AGENT OR ADJUVANT, PH CONTROL AGENT

ALLYL THIOPROPIONATE is a thiopropionate ester used in the flavor industry as a flavoring agent with a characteristic alliaceous sensory profile.

What It Is

ALLYL THIOPROPIONATE is an organic sulfur-containing ester classified for use in foods as a flavoring agent or adjuvant and sometimes as a pH control agent. It is identified by the Chemical Abstracts Service registry number 41820-22-8 and is recognized in flavor databases by unique identifiers such as FEMA number 3329 and JECFA number 490. As a thiopropionate, it contains a sulfur atom in the ester linkage, which contributes to its distinctive sensory attributes often described as alliaceous or reminiscent of fresh onion and green vegetable nuances. This compound does not currently have an assigned E-number under the European system and is not listed in direct food additive regulations with a specific codified allowance. Instead, it is recognized in international flavoring specifications and flavor ingredient inventories where certain safety assessments have been undertaken. It is included in flavoring agent inventories that provide descriptive chemical information and links to expert evaluations without implying formal regulatory approval for all jurisdictions. In scientific classification, it falls within a group of sulfur-containing esters used for flavor modification due to their potent sensory impact at low concentrations. Its use in food formulations is primarily for imparting or enhancing savory, vegetable, or onion-like flavor notes, particularly in complex flavor systems where such nuances are desirable.

How It Is Made

The manufacturing of ALLYL THIOPROPIONATE typically involves esterification reactions between an allyl alcohol derivative and a thiopropionic acid derivative under controlled conditions. In a generalized sense, thiopropionic acid can be reacted with an allyl-containing alcohol or its derivative, often in the presence of an acid catalyst, to yield the thioester product. Purification steps such as distillation, washing, and drying are integrated to achieve a product suitable for flavoring use. Because the chemistry involves sulfur, the reaction conditions are maintained to minimize the formation of unwanted byproducts and to control the presence of free sulfurous compounds that could influence sensory properties. The final product is often characterized by analytical techniques such as gas chromatography and refractive index measurement to meet defined specifications in flavoring applications. Commercial chemical suppliers producing this ingredient for research or industrial use typically state the assay and physical properties of the product, which include typical density, boiling point, and odor characteristics. While industrial-scale production methods are optimized for yield and consistency, detailed proprietary steps are not publicly disclosed in regulatory or reference databases. Specifications and allowed impurities may be referenced in flavoring agent compendia maintained by expert panels, which ensure that the manufactured compound exhibits the expected sensory profile and purity for its intended use.

Why It Is Used In Food

In the context of food formulation, ALLYL THIOPROPIONATE is used primarily as a flavoring agent to contribute specific sensory characteristics that cannot easily be achieved with basic food ingredients alone. Its sulfur-containing structure yields strong alliaceous notes that are perceived at very low concentrations, making it a useful tool for flavorists working on savory profiles. When judiciously applied, it can enhance the complexity of flavors in products where onion, vegetable, or savory depth is desired. Flavoring agents like allyl thiopropionate serve technological functions in food beyond mere taste contribution. They help replicate or amplify natural flavor profiles in processed foods that may otherwise lack sensory richness due to processing losses. Additionally, such agents can improve consumer appeal by aligning the overall flavor experience with familiar culinary expectations. Because flavor perception is influenced by the interplay of volatile compounds, the inclusion of targeted sulfur-containing esters can fine-tune a product’s aromatic bouquet. Commercial and research use often focuses on applications in seasonings, soups, snack foods, and other savory applications where a balanced flavor profile that includes alliaceous notes enhances overall acceptability. Its selection by flavor chemists is based on sensory evaluation, compatibility with other flavor components, and stability under the intended conditions of use. Regulatory bodies and expert panels may evaluate available data on these compounds to inform safe use levels without assigning regulatory numbers in every region.

Adi Example Calculation

Because a specific numeric ADI was not assigned for ALLYL THIOPROPIONATE by JECFA and the compound is considered to pose no safety concern at current levels of intake, illustrative numerical calculations are not applicable in this context. Typically, for a compound with a defined ADI, one would multiply the ADI by a hypothetical body weight to estimate a maximum allowable intake. Without a numeric ADI, such calculations are not meaningful for this compound. Instead, manufacturers and regulators consider typical use levels in formulated products and aggregate exposure across possible food categories. This ensures that sensory functions are achieved without exceeding intake patterns that expert review has determined to be safe. Where exposure data change or new toxicological information emerges, review by expert committees may revisit these assessments.

Safety And Health Research

Safety and health research for flavoring agents like ALLYL THIOPROPIONATE focuses on toxicological endpoints relevant to substances that contribute to the sensory profile of foods at low concentrations. International expert panels review available data on absorption, metabolism, and potential toxic effects, considering structural analogues and available studies to inform safety conclusions. For this compound, the Joint FAO/WHO Expert Committee on Food Additives evaluated available evidence and concluded that there is no safety concern at current levels of intake when used as a flavoring agent. (世界卫生组织) This type of evaluation typically includes assessment of genotoxicity, subchronic toxicity, and other endpoints relevant to long-term exposure. However, specific numeric acceptable daily intake values are not always assigned for flavoring agents where exposure estimates are very low and do not raise safety concerns based on available data. Expert evaluations often provide narrative conclusions rather than numeric limits when the margin of exposure is considered sufficient given typical use patterns. Because sulfur-containing esters can vary widely in their biological interactions, safety assessments emphasize understanding any potential for irritation or metabolic byproducts. For allyl thiopropionate, sensory and flavor industry data guide use levels to those that achieve desired sensory effects without exceeding concentrations at which off-notes or other effects might emerge. Researchers and regulatory bodies continue to monitor data as part of ongoing safety review processes.

Regulatory Status Worldwide

Regulatory status for flavoring agents such as ALLYL THIOPROPIONATE varies by jurisdiction. International expert evaluations by bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have assessed this compound as a flavoring agent, assigning it a JECFA number 490 and indicating that there is no safety concern at current levels of intake when used as a flavoring agent. This qualification reflects an expert review of available data and is recorded in the WHO JECFA database, where specifications and evaluation summaries are provided for flavoring agents evaluated by the committee. (世界卫生组织) In the United States, the substance appears in the FDA’s Substances Added to Food inventory (formerly EAFUS), which lists flavoring agents and technical effect categories. Its inclusion in this inventory reflects recognition of its use and documented technical effects but does not constitute an automatic regulatory approval or specification in the Code of Federal Regulations. The FDA inventory notes the association with FEMA and JECFA evaluations, clarifying that inclusion is informational and not a statement of approval. Other jurisdictions may reference specifications from expert panels or regional flavoring evaluations for analogous compounds. There is not a universally codified additive number in every regulatory framework for this compound, and manufacturers typically consult local regulatory authorities and standards for permitted use levels and labeling requirements.

Taste And Functional Properties

ALLYL THIOPROPIONATE exhibits distinct sensory properties characterized by alliaceous notes reminiscent of onion, garlic, and green vegetables. Sensory evaluation data describe its odor and taste as fresh onion with a green sweet vegetable nuance at threshold concentrations used in flavor research. Such potent sensory attributes mean that relatively low concentrations in flavor blends can impart significant impact. From a functional standpoint, its solubility profile reflects its moderate polarity, with solubility in alcohol and limited solubility in water, aligning with many flavoring agents that are formulated in solvent systems to facilitate even distribution. It is generally stable under typical processing conditions encountered in flavor blending and incorporation into dry mixes or liquid food systems, though like many sulfur-containing compounds, it may be sensitive to extreme heat or pH conditions that could alter its sensory contribution. In flavor creation, understanding the balance between odor strength and persistence is critical, and allyl thiopropionate’s distinctive profile allows it to serve as a building block in complex flavor systems. It interacts with other volatile components to create a cohesive sensory experience, with its functional behavior influenced by factors like temperature, matrix effects, and the presence of other aromatics. Its inclusion in flavor libraries and sensory reference guides underscores its recognized role among flavor professionals.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a concept used by food safety authorities to describe an estimate of the amount of a substance that can be ingested daily over a lifetime without appreciable health risk. For many flavoring agents, including ALLYL THIOPROPIONATE, expert evaluations assess whether typical intake levels from food are sufficiently low that there is no safety concern, which may obviate the need for a specific numeric ADI. In the case of allyl thiopropionate, international expert review by JECFA concluded that there is no safety concern at current intake levels when used as a flavoring agent. This type of conclusion reflects comprehensive consideration of available exposure data and toxicological evidence, and may be interpreted as the compound not requiring a specified numeric ADI because typical use results in exposure far below levels of toxicological concern. ADI values are typically given as milligrams per kilogram of body weight per day when established, but for many flavoring agents with negligible intake, narrative conclusions suffice. It is important to note that ADIs are not recommended targets for consumers to reach, but regulatory tools to guide safe use levels in food products. Producers and regulators use these assessments to ensure that any potential exposure remains within ranges supported by safety data and expert review.

Comparison With Similar Additives

ALLYL THIOPROPIONATE can be compared with other sulfur-containing flavor esters and thiols that serve as flavoring agents in savory applications. For example, allyl sulfides and disulfides, often derived from natural sources such as garlic or onion extracts, contribute potent alliaceous notes in food systems. While natural extracts contain complex mixtures, isolated compounds like allyl thiopropionate offer flavorists precise control over the sensory impact. In contrast to simple esters that impart fruity or floral notes, sulfur-containing esters like allyl thiopropionate are selected for their savory impact. Compared with non-sulfur esters such as ethyl propionate or amyl acetate, which contribute sweet or fruity nuances, thiopropionate esters align more with vegetable or herbaceous profiles. Other sulfur-containing compounds used in food flavoring, such as certain thiols, may exhibit even stronger odor thresholds and require careful balancing to avoid overpowering the flavor profile. These comparisons highlight how different classes of flavoring agents are chosen based on their functional sensory contributions and how compounds with similar structural features can be leveraged to fine-tune complex flavor systems.

Common Food Applications Narrative

Flavoring agents such as ALLYL THIOPROPIONATE are incorporated into a variety of food and beverage formulations where savory or vegetable-like sensory cues are desired. In seasoned snack foods, for example, precise blends of sulfur-containing esters can mimic the aroma of fresh culinary ingredients, contributing to consumer perceptions of freshness and complexity. In condensed soup formulations, specific flavoring agents help reconstruct depth that may be lost during processing and shelf storage. Seasoning blends for meat analogues, vegetarian products, or savory sauces also benefit from judicious use of targeted flavoring agents. Here, the combination of alliaceous notes with other flavor classes contributes to a rounded profile that aligns with consumer expectations. Similarly, soup bases and bouillon formulations often include diverse flavoring agents to achieve balanced savory profiles that enhance umami and aromatic richness. Beyond these examples, flavorists may use compounds like allyl thiopropionate in processed vegetable products, snack seasonings, and complex sauces where the interplay of aroma and taste defines the product’s character. Because flavor perception is subjective and influenced by cultural and culinary context, the utilization of specific flavoring agents is tailored through sensory analysis and consumer testing. The objective is to achieve a sensory result that resonates with the intended audience while respecting formulation requirements and regulatory considerations for flavoring substances.

Safety & Regulations

FDA

  • Notes: Inclusion in the FDA Substances Added to Food inventory does not imply formal approval; no specific CFR section confirmed.

EFSA

  • Notes: No specific EFSA regulatory evaluation located.

JECFA

  • Notes: JECFA concluded no safety concern but did not assign a numeric ADI on the d database entry.
  • Adi Display: No safety concern at current intake levels for flavoring use

Sources

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