ALLYL DISULFIDE

CAS: 2179-57-9 FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT

ALLYL DISULFIDE is a sulfur‑containing flavoring agent permitted under US food additive regulation 21 CFR 172.515 and evaluated internationally by JECFA as a flavoring substance used at levels that do not raise safety concerns when used as intended.

What It Is

ALLYL DISULFIDE is a chemically defined flavoring substance identified by CAS number 2179‑57‑9 that functions as a flavor enhancer, flavoring agent, or adjuvant in food products. It belongs to the class of organosulfur compounds and is known for its characteristic garlic‑like odor. In food applications, it contributes to savory and meaty flavor profiles and is included among synthetic flavoring substances listed in US federal regulation 21 CFR 172.515, which permits its use in food when used according to good manufacturing practice and in amounts sufficient only to produce the desired flavor effect. Associated synonyms include DIALLYL DISULFIDE, 2‑PROPENYL DISULFIDE, and 4,5‑DITHIA‑1,7‑OCTADIENE, reflecting structural descriptions of the compound that contain two allyl groups bridged by a disulfide bond. The compound appears in both regulatory listings and flavoring inventories that define its role within broad categories of flavoring agents.

How It Is Made

The production of ALLYL DISULFIDE for food use typically involves synthetic chemical methods or extraction and purification from natural sources rich in organosulfur compounds such as garlic and other Allium species. Commercial synthesis routes often start from precursors like allyl mercaptan, which are oxidized under controlled conditions to form the disulfide bond linking the allyl groups, followed by purification steps that achieve the high chemical purity required for use in flavor applications. In extracted form from natural plant materials, the compound is separated from other sulfur‑containing constituents through distillation or chromatographic techniques. Specifications for identity and purity are characterized in technical references that support regulatory and flavor industry standards. Manufacturers adhere to principles of good manufacturing practice to ensure that the resulting product meets established quality criteria for flavoring agents used in consumer foods.

Why It Is Used In Food

Food formulators use ALLYL DISULFIDE to enhance and complement flavor profiles, particularly in products where a savory, garlic‑like note is desirable. Its inclusion as a flavor enhancer or adjuvant can help achieve the intensity and character of meat, condiment, or savory seasoning flavors without relying solely on natural extracts. In processed foods, flavoring agents like ALLYL DISULFIDE are selected based on their compatibility with other ingredients, volatility and stability during cooking and storage, and their ability to deliver consistent taste performance at low usage levels. The regulatory listing in US federal food additive regulations underscores that it may be used at the minimum levels necessary to achieve its intended technological effect in food formulations.

Adi Example Calculation

To illustrate how acceptable intake considerations are applied in safety evaluations, consider a hypothetical example where a compound has a defined ADI of X milligrams per kilogram of body weight per day (note that for ALLYL DISULFIDE, regulatory evaluations have concluded no safety concern at current intake levels rather than establishing a numeric ADI). If a flavoring compound with a defined ADI of X mg/kg bw/day were used, an adult weighing 70 kilograms would have a theoretical allowable intake of 70 times X milligrams per day. This calculation helps risk assessors and formulators compare actual estimated intake from food uses to the ADI to ensure safety margins are maintained, and similar approaches are used for many food additives when numerical ADIs are available.

Safety And Health Research

Safety evaluation of ALLYL DISULFIDE centers on toxicological assessments that examine potential hazards relative to expected dietary exposure from its use as a flavoring agent. International expert bodies have reviewed the available data and characterized the compound in the context of chemical safety, including studies on its metabolism, organ system effects, and potential allergenicity. Given that ALLYL DISULFIDE is a component of garlic oil, exposures from normal dietary patterns have been considered alongside flavoring use, and consensus scientific assessments indicate that typical use levels do not present safety concerns. Toxicological endpoints evaluated in research include acute toxicity, metabolic fate, and potential for adverse effects at doses well above expected human dietary exposures, with regulatory conclusions emphasizing safety at current use levels. Detailed mechanistic data help inform risk assessment, but summaries focus on overall weight-of-evidence approaches used by regulators rather than individual study outcomes.

Regulatory Status Worldwide

Within the United States, ALLYL DISULFIDE is listed among synthetic flavoring substances and adjuvants permitted for direct addition to food under Title 21 of the Code of Federal Regulations, section 172.515, subject to good manufacturing practice and use at minimum levels necessary for flavoring effect. In this context, the regulation acknowledges its safety when used as intended without specifying numerical limits. Internationally, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated the compound as a flavoring agent (JECFA No. 572) and concluded that there is no safety concern at current levels of intake when used as a flavoring agent, reflecting international scientific assessment of its safety at typical use levels. Regulatory frameworks in other regions vary, and compound use in food must comply with local food additive laws and standards that govern flavoring substances.

Taste And Functional Properties

ALLYL DISULFIDE imparts a pungent, garlic‑like sensory note characteristic of organosulfur compounds. In flavor applications, it works synergistically with other compounds to build complex savory and meaty taste profiles. Its functional behavior is influenced by factors like solubility in different food matrices, volatility at elevated temperatures, and stability under typical processing conditions; it is generally more soluble in fats and oils than in water, reflecting its organic nature. Sensory thresholds for flavor perception can vary depending on the product context and presence of other aromatic compounds, with quality control relying on trained sensory panels and chromatographic profiling. Although valued for its contribution to savory notes, the compound is used sparingly due to its strong odor and potent sensory impact.

Acceptable Daily Intake Explained

Acceptable Daily Intake (ADI) is a concept used by food safety authorities to describe the estimated amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on toxicological data and conservative safety factors. For many flavoring agents, including ALLYL DISULFIDE, regulatory evaluations have concluded that there is no safety concern at current levels of intake, and therefore a numerical ADI is not established in the same way as for some other classes of additives. Instead, safety assessments consider typical use levels in food, normal dietary patterns, and margins of exposure to ensure that consumer intake remains well below any levels associated with adverse effects in experimental studies. The absence of a specific numerical ADI in regulatory references reflects this context of safety evaluation rather than a recommended intake level for consumers.

Comparison With Similar Additives

ALLYL DISULFIDE shares functional and sensory space with other organosulfur flavoring substances such as diallyl trisulfide and allyl sulfide, which also contribute garlic‑like and savory notes in flavor formulations. Compared to these related compounds, ALLYL DISULFIDE delivers a distinct balance of pungency and savory intensity, with formulation choices depending on desired sensory outcomes. In broader comparison, sulfur‑containing flavor enhancers often provide robust aroma contributions but require precise control over use levels to avoid overpowering the product’s overall flavor profile. Blends of multiple flavoring agents allow food developers to achieve nuanced taste effects that single compounds alone may not deliver, and understanding the properties of each helps guide ingredient selection and optimization in complex food systems.

Common Food Applications Narrative

ALLYL DISULFIDE appears in a range of food categories where savory, spicy, or meaty flavors are key to consumer expectations. For example, in sauces and gravies, the compound helps reinforce garlic and onion notes when blended with other natural and synthetic flavor substances. In baked goods such as breads and crackers, it can enhance the overall savory character without introducing overpowering flavor when formulated appropriately. Condiments and relishes benefit from the compound’s ability to round out spice blends, while processed meat products use it to simulate the aromatic complexity of cooked garlic and seasonings. Ready-to-cook meal kits and snack seasonings often include such flavor enhancers to maintain taste consistency across production batches. Frozen prepared foods and soups may also incorporate the compound to complement other flavor ingredients, especially in products positioned for bold, savory taste profiles. Across these applications, the use of ALLYL DISULFIDE is engineered to deliver targeted flavor effects while remaining within the sensory expectations of end consumers.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.515

EFSA

  • Notes: No specific EFSA evaluation found in available sources

JECFA

  • Year: 1999
  • Adi Display: no safety concern at current intake levels

Sources

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