BIS(2-METHYLPHENYL) DISULFIDE

CAS: 4032-80-8 FLAVORING AGENT OR ADJUVANT

BIS(2-METHYLPHENYL) DISULFIDE is an organic sulfur compound identified by CAS 4032-80-8 and evaluated by flavor industry and food additive regulatory bodies as a flavoring agent under FEMA GRAS assessments.

What It Is

BIS(2-METHYLPHENYL) DISULFIDE is a synthetic organosulfur compound that belongs to the disulfide chemical class and is identified by the CAS number 4032-80-8. It is also known by various synonyms including O-Tolyl Disulfide, bis(2-methylphenyl) disulfide, di-o-tolyl disulfide, and disulfide, bis(2-methylphenyl). This chemical is generally regarded in the flavor industry context as a flavoring agent or flavor adjuvant substance that can contribute to sensory profiles due to its distinct odor attributes reported in specialized databases. It is classified in flavor ingredient lists under FEMA number 4576 and has been evaluated by expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) for potential use in food flavoring applications, although evaluative work continues regarding its full safety assessment. The compound is predominantly a yellow to pale solid or oil with organosulfur character commonly encountered in industrial and flavor contexts rather than naturally occurring in significant quantities in common foods. Its identification and function have led to its inclusion in flavor regulatory inventories to provide clarity on its technical identity and uses in food flavor systems. These flavor uses are typically specialized and occur at low use levels in complex flavor formulations that enhance aroma or modify taste profiles, rather than serving as primary food ingredients or bulk additives.

How It Is Made

The synthesis of BIS(2-METHYLPHENYL) DISULFIDE involves the formation of a disulfide bond between two 2-methylphenyl moieties. In industrial or research settings, organosulfur compounds of this type are generally prepared through oxidative coupling reactions of corresponding thiol or sulfide precursors under controlled conditions that promote formation of the S-S linkage. For example, precursors such as toluidine or methylphenyl sulfides can be converted to disulfides through controlled oxidation with mild oxidants or by using sulfur-based reagents. Because this compound has greater hydrophobic character due to the aromatic rings, the reaction is typically done in organic solvents suited for nonpolar intermediates. After synthesis, purification steps such as crystallization, distillation, or chromatography are applied to achieve the technical grade product. The manufacturing process must comply with laboratory safety standards, including protective measures against exposure to organosulfur compounds, which can be irritating or toxic at high concentrations. Production of disclosed flavor compounds for use in food applications further requires adherence to food-grade manufacturing practices where applicable, though not all industrial grade material is suitable for direct food use without additional purification and regulatory clearance. The specifics of industrial methods and conditions can vary widely depending on the scale of production and the exact precursor chemicals employed, and are often proprietary to manufacturers. Nonetheless, at a high level, the formation of disulfides from corresponding sulfide precursors through controlled oxidation represents a common approach to synthesizing this compound class.

Why It Is Used In Food

BIS(2-METHYLPHENYL) DISULFIDE is incorporated into food and beverage flavor systems primarily for its ability to contribute unique aromatic and organoleptic characteristics when used in small quantities. Flavoring agents are selected based on how they interact with other components to produce desired sensory effects such as enhancing complexity, rounding off sharp notes, or contributing specific odor notes that are not easily achieved with simpler compounds. In the case of this compound, its sulfur-containing structure can contribute nuanced aroma facets that may be desirable in certain savory, roasted, or complex flavor profiles. Flavor chemists often leverage compounds like BIS(2-METHYLPHENYL) DISULFIDE to create balanced flavor formulations in products such as sauces, snacks, seasonings, and beverage concentrates, where subtle enhancement of aroma and taste is critical to product character. These compounds are typically used at very low concentrations because of their potent sensory impact and the need to achieve specific flavor target profiles. While it is not a bulk ingredient like salt or sugar, its value lies in fine-tuning the sensory experience for the consumer. The compound’s role as an adjuvant refers to its use alongside other flavoring agents to support or modify their properties rather than acting alone as a primary flavoring component. Industry flavor libraries and regulatory inventories list it to provide transparency about its identity and permitted functional roles in flavor design and formulation.

Adi Example Calculation

Because there is no specific numeric ADI established for BIS(2-METHYLPHENYL) DISULFIDE based on available evaluations, an illustrative calculation using an ADI framework cannot be provided. Normally, an illustrative example would take a numeric ADI and apply it to a hypothetical body weight to demonstrate how much of a compound could be consumed daily within safety limits. Without an established ADI value, this type of example is not applicable for this compound at present, underscoring the need for complete evaluation data before such calculations can be offered.

Safety And Health Research

Regulatory evaluations of flavoring agents such as BIS(2-METHYLPHENYL) DISULFIDE focus on assessing toxicological endpoints including metabolism, acute and chronic toxicity, and potential genotoxicity. Flavor industry expert panels, including those convened by FEMA and JECFA, review available data to determine whether a substance can be considered generally recognized as safe for its intended use. In the case of this compound, while it has been evaluated by JECFA and assigned an evaluation number, the assessment was not completed due to a requirement for additional data. This means that comprehensive safety conclusions based on robust toxicological evidence are not fully established in available public records. In general, the safety research framework for flavoring agents involves consideration of exposure levels, organoleptic potency, and metabolic fate, with expert panels applying threshold of toxicological concern (TTC) and other risk assessment methods to determine if use at low concentrations presents negligible risk. Absent complete evaluation data, safety discussions emphasize that use should adhere to expert panel recommendations and current regulatory inventory listings, and that further research would be necessary to support detailed quantitative safety conclusions.

Regulatory Status Worldwide

BIS(2-METHYLPHENYL) DISULFIDE is listed in flavor ingredient inventories such as the FEMA Flavor Library with FEMA number 4576 and is associated with a JECFA evaluation number 1931, indicating regulatory interest and assessment by recognized food additive authorities. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated this compound as a flavoring agent, with documentation noting that evaluation was not completed due to a need for additional data to fully establish safety parameters, and no specific acceptable daily intake (ADI) has been allocated at this time. This pending evaluation status reflects regulatory caution when comprehensive toxicological data are not fully available. In the United States, this compound is referenced in the FDA’s Substances Added to Food Inventory in the context of flavoring substances evaluated by FEMA, which signifies its recognition by regulatory frameworks for potential use under conditions appropriate for flavoring agents but does not constitute an explicit food additive approval in the CFR. In the European Union, there is no commonly reported E-number associated with this compound, and no formal EFSA opinion specifying numerical ADI values has been published in publicly available sources. Overall, the regulatory status worldwide reflects ongoing evaluation and use under expert panel recommendations in flavor applications rather than as a broadly authorized direct food additive with universally established numeric safety thresholds.

Taste And Functional Properties

BIS(2-METHYLPHENYL) DISULFIDE exhibits organosulfur sensory qualities that are detectable at very low concentrations in flavor applications. Sulfur-containing compounds can impart complex aromatic notes that range from subtle roasted or savory impressions to more intense earthy or sulfurous nuances depending on context and concentration. Because human perception of flavor is highly sensitive to organosulfur structures, this compound’s effective use in flavoring systems relies on precise formulating practices to avoid overpowering or undesirable sensory effects. In terms of functional behavior, like many hydrophobic disulfides, BIS(2-METHYLPHENYL) DISULFIDE has limited water solubility but better solubility in nonpolar matrices or solvent systems used in flavor preparations. Its stability is influenced by factors such as temperature and pH, with potential susceptibility to degradation under highly oxidative conditions or prolonged heat exposure, which can alter its sensory attributes. For flavor formulation, such properties mean that careful consideration of processing conditions is necessary to maintain the integrity of its contribution to the final product. The compound’s sensory properties and functional characteristics are valuable in nuanced flavor design and when paired with complementary ingredients that balance or modulate its aromatic notes.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a regulatory risk assessment metric representing the estimated amount of a substance that can be ingested daily over a lifetime without appreciable health risk. For many flavoring agents, expert bodies like JECFA assess available toxicological data and determine an ADI expressed in mg of compound per kg of body weight per day. However, for BIS(2-METHYLPHENYL) DISULFIDE, the JECFA evaluation was noted as incomplete, and no numeric ADI value has been established in publicly accessible evaluation documents. Therefore, while the concept of an ADI provides a useful benchmark for understanding exposure safety, in this case no specific numeric ADI can be stated with confidence based on current authoritative documentation. This absence highlights the importance of comprehensive toxicological data in establishing formal numeric safety thresholds for food-related compounds.

Comparison With Similar Additives

BIS(2-METHYLPHENYL) DISULFIDE is one among many organosulfur flavoring agents that contribute complex sensory attributes when used at low levels in food flavorings. Other organosulfur compounds used in flavor design include diallyl disulfide, which imparts garlic-like notes, and allyl propyl disulfide, associated with onion and savory notes. While these compounds share sulfur-based functional groups that influence aroma, their sensory profiles differ significantly, with each compound offering distinct odor characteristics that flavorists leverage for specific applications. Compared with simpler sulfur-containing flavor molecules such as allyl sulfides, BIS(2-METHYLPHENYL) DISULFIDE tends to be less volatile and more complex in structure, resulting in subtler or more nuanced aroma contributions. Such differences inform how flavorists select and balance these compounds in formulations to achieve targeted sensory outcomes.

Common Food Applications Narrative

In culinary and industrial flavor contexts, BIS(2-METHYLPHENYL) DISULFIDE appears as a specialized component within complex flavorings designed to enhance the sensory appeal of certain food products. Flavorists may include trace amounts of this compound in savory concentrates, seasoning blends, or processed beverage bases to achieve specific aromatic profiles that cannot be accomplished with simpler flavor molecules alone. Its organosulfur nature means that it contributes nuanced odor characteristics that can enhance complexity or depth in multi-ingredient flavor systems. In consumer-focused products, these sophisticated flavor formulations are commonly found in products such as snack seasonings, soup bases, sauces, and savory snacks where layered aroma and taste profiles are key to consumer preference. Because BIS(2-METHYLPHENYL) DISULFIDE is typically used at minute levels, it does not appear on product packaging as an ingredient by name, but it plays a role within proprietary flavor blends crafted by sensory scientists. The purpose of including such an ingredient is not to directly impart a pronounced taste or aroma on its own, but to subtly influence the overall sensory quality of the final product in a way that aligns with consumer expectations for rich and complex flavor experiences.

Safety & Regulations

FDA

  • Notes: No explicit FDA food additive regulation section found; listed in flavor ingredient inventory context with FEMA reference.

EFSA

  • Notes: No EFSA numeric ADI established in available sources.

JECFA

  • Notes: JECFA evaluation is pending additional data and no numeric ADI established on d entry.

Sources

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