DL-(3-AMINO-3-CARBOXYPROPYL)DIMETHYLSULFONIUM CHLORIDE

CAS: 3493-12-7 FLAVORING AGENT OR ADJUVANT

DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride is a synthetic sulfonium compound used as a flavoring agent, historically known as Vitamin U, evaluated by the Joint FAO/WHO Expert Committee on Food Additives with no safety concern at current levels of intake for use as a flavoring agent.

What It Is

DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride is a defined chemical substance used in food and flavor science. This compound, with the CAS number 3493-12-7, belongs to the class of sulfonium salts and is structurally derived from the amino acid methionine. It is often encountered under a variety of names that reflect its chemical structure and functional roles, including methylmethionine sulfonium chloride. In some contexts it has been historically referred to as "Vitamin U," a term rooted in older nutritional literature, though it is not a true vitamin by modern nutritional science. The compound has been evaluated by international expert bodies and assigned identifiers such as JECFA number 1427 and FEMA number 3445 in flavor ingredient inventories. On a molecular level, the substance consists of a dimethylsulfonium moiety attached to an amino-carboxypropyl backbone, conferring water solubility and enabling its utility in aqueous food systems. Its biochemical identity places it among small, polar organosulfur compounds used for specific sensory and functional purposes in food formulation. Many other sulfonium compounds exist in nature and in industrial applications, but this specific derivative has been examined for its safety and technological function when used in flavor-related applications at low concentrations. In the context of food science and regulatory assessment, DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride is understood primarily as a flavoring agent or adjuvant. Its classification reflects its role in imparting or enhancing taste and aroma attributes rather than acting as a nutrient or preservative. Despite historical references to nutritional effects in older pharmacological sources, contemporary regulatory evaluations focus on its sensory modulation properties within food matrices. The chemical structure lends itself to interaction with taste receptors and the release of volatile compounds that contribute to savory, umami, or vegetable-like notes when incorporated at appropriate levels in food products. It is important to distinguish between its historical therapeutic narrative and its regulated use in food, as modern food regulation and safety assessment rely on documented toxicology and exposure data rather than traditional medicinal uses. Its broad synonym list and multiple identifiers across databases underscore both its chemical versatility and the need for precise regulatory context when discussing its application in food systems.

How It Is Made

The production of DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride typically involves synthetic organic chemistry techniques. At a high level, its manufacture begins with methionine or a related precursor compound that undergoes methylation to introduce the sulfonium functional group. This synthetic route ensures that the dimethylsulfonium moiety is covalently attached to the amino acid backbone. The reaction conditions are controlled to achieve the desired stereochemical form, purity, and yield suitable for further formulation or analytical use. Commercial production often employs stoichiometric methylating agents and controlled pH environments to prevent side reactions or unwanted by-products, with subsequent purification steps such as crystallization or chromatography to isolate the target compound. The resultant material is typically a white to off-white solid with high water solubility, reflecting its ionic character and enabling its use in aqueous food formulations. Manufacturers producing DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride for flavor applications adhere to chemical purity standards that are appropriate for food ingredient use. Although specific industrial processes vary by producer, common steps include post-reaction solvent removal, recrystallization in controlled environments, and quality testing using spectroscopic techniques to confirm identity, structure, and absence of contaminants. Analytical methods such as nuclear magnetic resonance (NMR), infrared (IR) spectroscopy, and chromatography are standard in verifying the compound’s purity and suitability for its intended function. Suppliers of analytical standards and research-grade material often provide accompanying certificates of analysis, ensuring that batch-to-batch consistency meets laboratory and regulatory expectations. This emphasis on precise characterization is crucial given the compound’s use in flavor science, where trace constituents can influence sensory outcomes. While detailed proprietary methods may differ across producers, the overall approach to making DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride reflects general principles of synthetic chemistry tailored for food-related compounds. Emphasis on controlling reaction conditions, minimizing impurities, and validating chemical identity aligns with broader practices in chemical manufacturing for food-grade substances. It is important to note that, beyond production, quality control and regulatory compliance processes ensure that the final product meets safety and labeling criteria in jurisdictions where it is used as a flavoring agent. These steps collectively facilitate the responsible synthesis and deployment of this compound in food science applications.

Why It Is Used In Food

DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride is used in food systems primarily for its sensory impact and technological roles. As a flavoring agent or adjuvant, it can influence the perception of taste by enhancing or modulating specific flavor notes. Compounds in this class of sulfonium derivatives interact with taste receptors and aroma compounds, contributing subtle savory, vegetable-like, or umami nuances to food products when used at low levels. Flavoring agents such as this are often selected for their capacity to complement natural flavors, balance sensory profiles, and support consistent taste quality across production batches in complex food matrices. In the broader context of flavor science, DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride serves a specific role that is distinct from nutrients or preservatives. Its usage is typically at concentrations that are sufficient to achieve the desired sensory effect without imparting off-flavors or altering the nutritional profile of the food. Technologists may choose this compound when formulating products that benefit from enhanced mouthfeel or amplified undertones associated with savory or vegetable-derived notes. This makes it useful in applications where subtle sensory balancing is required, such as in soups, sauces, seasonings, or plant-based formulations where the flavor complexity must be carefully tuned. Additionally, in industrial flavor design, such compounds are evaluated for compatibility with other flavor ingredients, stability under processing conditions, and predictability of sensory outcomes. Their inclusion in proprietary flavor blends may reflect iterative formulation work where the cumulative influence of multiple ingredients is considered. DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride offers formulators another tool within the palette of allowed flavoring agents, enabling targeted modifications to taste perception without significantly affecting texture or nutritional labeling. Its historical identification as "Vitamin U" in older literature underscores its biological interest beyond food flavoring, but contemporary use in food technology is focused on sensory attributes rather than nutritional claims.

Adi Example Calculation

To illustrate the concept of acceptable daily intake (ADI) in a general sense, consider how a numeric ADI is typically used, even though a numeric ADI was not explicitly assigned for DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride in the available JECFA evaluation. For example, regulatory bodies might establish an ADI of 0.5 mg per kilogram of body weight per day for a hypothetical additive. In this illustrative scenario, a person weighing 70 kilograms (about 154 pounds) could theoretically consume up to 35 milligrams of that additive daily over a lifetime without appreciable health risk, as defined by the expert committee’s criteria. It is important to emphasize that this is merely a hypothetical calculation and does not reflect the regulatory assessment or ADI for this specific compound. In practice, the actual intake of a flavoring agent like DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride would be far lower than such illustrative ADI values because flavoring agents are used at low concentrations to achieve sensory effects. Furthermore, when an expert body concludes there is no safety concern at current intake levels, it implies that exposure estimates based on typical food use are well within a margin considered safe by toxicological standards. Thus, consumers need not calculate individual intake for flavoring agents; rather, regulatory evaluations ensure that common usage patterns are consistent with safety objectives. This illustration underscores how numeric ADIs serve as reference points in regulatory science, guiding risk assessment and management decisions. In cases where expert committees do not assign a numeric ADI because they find no safety concern at expected intake, it reflects confidence in the safety of typical use levels based on available evidence. Such frameworks help harmonize regulatory decisions across different jurisdictions and support informed decisions by food producers and regulators alike.

Safety And Health Research

Safety and health research for food additives like DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride centers on understanding the relationship between exposure levels and potential toxicological outcomes. International expert bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA) conduct comprehensive reviews of available data, including studies on absorption, metabolism, acute and chronic toxicity, and potential genotoxicity. For this compound, the JECFA evaluation concluded that there was no safety concern at current levels of intake when used as a flavoring agent, indicating that typical dietary exposure is not expected to pose health risks based on the data reviewed. This type of assessment reflects a risk-based framework where the expected consumption in food is weighed against evidence from animal studies or other toxicological investigations. Toxicological endpoints commonly examined in safety research include organ-specific effects, effects on reproduction and development, and potential interactions with cellular macromolecules. When expert committees assess a compound, they consider whether there are data suggesting adverse outcomes at exposures relevant to human consumption, and they apply safety factors to account for uncertainties. In the case of flavoring agents, exposure estimates are typically low compared to other classes of additives, which may contribute to the conclusion of no safety concern at current use levels. However, the absence of evidence for harm under expected intake does not imply that high doses or non-food exposures are safe; rather, it reflects a context-specific evaluation grounded in available scientific information. Health research often extends to comparing findings across structurally similar compounds and considering mechanistic data that may suggest pathways for potential effects. For sulfonium derivatives like DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride, their structural similarity to naturally occurring sulfur-containing compounds in the diet may inform safety considerations, though regulatory evaluations are based on controlled studies and exposure modeling rather than assumptions about structural relatedness alone. Continued research may refine understanding of metabolic pathways and long-term effects, but regulatory assessments to date provide the basis for use under typical flavoring conditions. The emphasis on careful evaluation illustrates the precautionary approach regulators take to ensure consumer safety in the context of additive use.

Regulatory Status Worldwide

Regulatory status for DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride varies across jurisdictions but has been evaluated by recognized expert bodies for use as a flavoring agent. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed this compound and assigned it JECFA number 1427, categorizing it within the functional class of flavoring agents. In the 2004 evaluation, JECFA concluded that there was no safety concern at current levels of intake when used as a flavoring agent, based on available toxicological and exposure data, and documented this assessment in its technical reports. This conclusion reflects an expert assessment of safety within the context of intended use and expected consumption patterns. The JECFA evaluation provides an internationally respected scientific basis for regulatory decisions in many countries and informs Codex Alimentarius considerations for food additive listings. "No safety concern at current levels of intake when used as a flavouring agent" is a phrase used in JECFA summary outputs to indicate that, under typical usage conditions, dietary exposure is not expected to pose health hazards. In the United States, compounds used as flavoring agents may be subject to inclusion in the FEMA GRAS (Generally Recognized as Safe) flavor ingredient inventory, a list of substances evaluated by the Flavor and Extract Manufacturers Association. Inclusion in this library is often submitted to the U.S. Food and Drug Administration for recognition under the Substances Added to Food Inventory, though specific CFR (Code of Federal Regulations) listings for this compound were not identified in the available authoritative sources. The FDA’s regulatory framework for food additives requires evidence that a substance is safe under its intended conditions of use, and flavoring agents often rely on FEMA GRAS status and JECFA evaluations to support regulatory compliance. In the European Union, flavoring substances may be assessed under EFSA’s flavoring regulations, with consideration of structural class, intake estimates, and toxicity data. Specific E-number assignments or EFSA ADI values for this compound were not found in the authoritative search, indicating limited or case-specific use evaluations in that context. Overall, DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride’s regulatory status is grounded in scientific evaluations by expert bodies focused on flavoring agents, with JECFA’s assessment serving as a key reference point for safety considerations worldwide. Regulatory frameworks continue to evolve, and substances used in food are subject to periodic re-evaluation as new data emerge.

Taste And Functional Properties

From a sensory perspective, DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride contributes subtle taste nuances rather than overt flavor notes. Its chemical structure enables interactions with taste receptors that can modulate perceptions of savory, umami, or mildly vegetable-like character in low-concentration applications. Unlike primary flavor compounds that deliver bold or distinctive tastes, this additive is used to enhance or fine-tune existing sensory profiles, supporting a balanced and rounded flavor in complex food systems. Its contribution is often context-dependent, influenced by the overall composition of the food, accompanying flavor ingredients, and processing conditions. In terms of functional behavior, this compound exhibits high water solubility, a characteristic that facilitates its incorporation into aqueous food matrices such as soups, beverages, sauces, and dressings. Its solubility profile ensures that it can distribute uniformly throughout the product, contributing to consistent sensory perception across servings. Additionally, its ionic nature provides stability in a range of pH environments typically encountered in food processing, supporting its use in diverse formulations. The stability and solubility attributes also aid formulators in achieving predictable flavor outcomes, an important consideration in commercial food production where batch-to-batch consistency is critical. Moreover, DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride’s functional properties extend to its interaction with other flavor compounds. It may act synergistically with amino acids, nucleotides, and other taste modulators to enhance overall flavor complexity without increasing the concentration of any single impactful sensory molecule. This synergistic behavior makes it valuable in fine-tuning flavor blends, particularly in products where delicate adjustments can elevate consumer perception of quality. While it does not impart strong sensory characteristics on its own, its ability to support and refine flavor profiles underscores its utility in flavor science and food technology.

Acceptable Daily Intake Explained

Acceptable Daily Intake (ADI) is a regulatory and scientific concept used to describe the amount of a chemical substance that can be consumed daily over a lifetime without appreciable health risk, based on current scientific evidence. For many food additives, expert bodies like the Joint FAO/WHO Expert Committee on Food Additives (JECFA) establish ADIs as numerical values with units of milligrams per kilogram of body weight per day, derived from toxicological studies and incorporating safety factors to account for uncertainties. However, for DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride, JECFA’s evaluation concluded that there was no safety concern at current levels of intake when used as a flavoring agent, and a specific ADI numeric value was not assigned in the evaluation summary. This outcome reflects a determination that the expected dietary exposure under intended use is sufficiently low and supported by toxicological data such that a formal ADI number was not deemed necessary within that context. It is important to distinguish between an ADI and actual consumption levels; the ADI represents a conservative threshold based on lifetime exposure estimates, whereas actual intake of a flavoring compound in food is typically much lower due to its function at low use levels. The absence of a numeric ADI in regulatory summaries does not mean the compound is unrestricted in use, but rather that the expert committee found no evidence of risk at customary consumption. ADIs are useful for risk managers and policymakers because they provide a reference point for comparing estimated human exposure with levels considered safe based on available science. For consumers and those interested in food safety, the concept of ADI underscores the idea that regulatory evaluations prioritize protecting public health by ensuring that exposures remain within scientifically vetted limits. Even when a compound does not have a specific numeric ADI, the conclusion of no safety concern at current intake levels provides assurance that its use as a flavoring agent is consistent with regulatory expectations for safety. Regulatory authorities may revisit ADIs or safety evaluations as new data become available, illustrating the dynamic nature of food additive risk assessment.

Comparison With Similar Additives

DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride can be compared with other flavoring agents and sensory modulators that serve similar roles in food formulation. For example, monosodium glutamate (MSG) is a well-known savory flavor enhancer that imparts umami taste by interacting with specific taste receptors. Unlike MSG, which contributes a distinctive savory note at moderate concentrations, DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride typically acts as a subtler modifier, enhancing or smoothing sensory profiles without dominance. Another related compound is guanosine monophosphate (GMP), used in combination with MSG to amplify umami characteristics; GMP, like DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride, plays a role in refining flavor complexity but does so through distinct chemical mechanisms. Other flavoring agents, such as yeast extracts or hydrolyzed vegetable proteins, contain a mixture of amino acids and nucleotides that contribute savory notes and depth to food products. These complex mixtures differ from the single-molecule nature of DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride, yet all serve the broader purpose of enhancing or balancing taste. In contrast to sweetness enhancers like thaumatin or stevia glycosides, which impact sweet taste perception, flavoring agents like DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride and the chemicals mentioned above focus on savory and umami landscapes. Each additive has distinct functional properties, regulatory frameworks, and typical use levels, illustrating the diversity of tools available to food technologists seeking specific sensory outcomes. While these comparisons highlight differences in sensory impact and chemical class, they also underscore a shared theme: the use of targeted compounds to shape flavor and enhance consumer appeal in food products. DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride is one among many such agents that contribute to the nuanced and complex world of taste modulation, complementing rather than replacing other flavoring strategies.

Common Food Applications Narrative

DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride finds application across a spectrum of food products where subtle flavor modulation is desirable. Food scientists and flavor technologists consider additives like this when the goal is to achieve a balanced sensory experience that complements the inherent qualities of the base ingredients. One common context is in savory soups and broths, where the additive can contribute to a nuanced umami background that enhances the perception of richness without dominating the inherent flavor of vegetables, grains, or proteins. Similarly, in sauces and dressings, it may be used as part of a broader formulation strategy to ensure that taste attributes are well-rounded and stable across production batches. In plant-based food products, where replicating the depth and complexity of traditional flavors can be challenging, DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride can help achieve a more satisfying taste profile. Its subtle influence supports the creation of products that appeal to consumers seeking savory and familiar sensory cues in alternatives to conventional meat or dairy-based foods. In ready-to-drink beverages that incorporate vegetable or herbal extracts, the compound’s water solubility and stability make it suitable for contributing to flavor fidelity and consumer appeal. It can support the preservation of delicate flavor notes during processing, particularly when heat treatment or extended storage might otherwise diminish sensory intensity. Additionally, snack seasonings and culinary kits often rely on a combination of flavor enhancers and modulators to achieve a coherent taste experience. DL-(3-Amino-3-carboxypropyl)dimethylsulfonium chloride’s role in this context is typically supportive, helping to bridge gaps between primary flavor components and ensuring a unified profile that resonates with consumer expectations. Across these applications, the compound’s inclusion reflects a deliberate selection by flavor professionals who weigh its sensory contributions against processing demands, ingredient interactions, and regulatory allowances. While it represents one component of a multifaceted flavor design landscape, its utility in refining taste experiences underscores the nuanced work involved in modern food formulation.

Safety & Regulations

FDA

  • Notes: Specific FDA CFR section not identified in authoritative sources; FEMA GRAS inventory submission implied but not directly confirmed.

EFSA

  • Notes: No explicit EFSA approval or E-number assignment found in authoritative sources.

JECFA

  • Notes: JECFA summary indicates no safety concern at current intake but does not assign numeric ADI value on the d page.
  • Adi Display: No safety concern at current intake levels when used as a flavouring agent

Sources

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