S-ALLYL-L-CYSTEINE

CAS: 21593-77-1 FLAVORING AGENT OR ADJUVANT

S-ALLYL-L-CYSTEINE is an organosulfur compound derived from the amino acid cysteine and found in garlic and aged garlic extract. It is used in flavor applications and has been evaluated by international expert committees for use as a flavoring agent.

What It Is

S-ALLYL-L-CYSTEINE is a chemically defined organosulfur compound, specifically a derivative of the proteinogenic amino acid cysteine in which the hydrogen attached to the sulfur atom is replaced with an allyl (prop-2-enyl) group. This structural modification confers distinct sensory and chemical properties compared with simple cysteine and contributes to its presence in certain allium plants like garlic and aged garlic extract. As a flavoring agent or adjuvant, S-ALLYL-L-CYSTEINE functions to impart or modify savory and roasted aromatic notes in food formulations and is evaluated for inclusion in flavor libraries by flavor expert panels. The compound’s CAS Registry Number is 21593-77-1, and it is included in established chemical registries and flavor evaluation lists. In chemical databases, it is catalogued under several synonyms and structural identifiers, confirming its identity and compositional characteristics as a small organosulfur molecule with a molecular formula of C6H11NO2S. The material is typically encountered as a white or near-white solid with a cooked roasted aroma when present in complex matrices. The compound is water soluble and stable under typical food processing conditions, contributing to its utility in flavor applications. Its inclusion in regulatory and flavor evaluation databases reflects its recognized status within the flavoring community and its historical usage in food-related applications.

How It Is Made

The production of S-ALLYL-L-CYSTEINE for food and flavor applications typically starts with controlled chemical synthesis or by extraction from natural sources such as garlic and aged garlic extract. In the chemical synthesis route, the starting material is the amino acid cysteine, which undergoes selective substitution at the sulfur atom with an allyl group through established organic reactions that preserve the stereochemistry and functional integrity of the molecule. This synthetic pathway ensures product consistency, high purity, and scalable manufacturing for industrial applications. Alternatively, natural extracts rich in organosulfur compounds can be processed to isolate S-ALLYL-L-CYSTEINE using chromatographic, crystallization, or other purification techniques. In both synthetic and extraction routes, manufacturers implement quality control measures to meet defined specifications, including purity thresholds, residual solvent limits, and sensory profiles appropriate for use as flavoring agents. Analytical techniques such as high-performance liquid chromatography (HPLC) and nuclear magnetic resonance (NMR) spectroscopy are employed to confirm the structural identity and assess purity levels. The production process must adhere to good manufacturing practices (GMP) and relevant food safety standards, ensuring that the final ingredient is suitable for use in food systems. Documentation of manufacturing processes, including raw material sourcing, reaction conditions, purification steps, and stability assessments, forms part of the technical dossier required by flavor evaluation panels and regulatory bodies. These controls help maintain batch-to-batch consistency and support safety and quality for its intended applications.

Why It Is Used In Food

S-ALLYL-L-CYSTEINE is utilized in food primarily for its flavoring properties. As an organosulfur compound found naturally in garlic and aged garlic extract, it contributes characteristic savory, roasted, and umami-like notes that enhance the sensory profile of a wide range of savory products. Chefs, food scientists, and flavor houses use this ingredient to augment or balance complex flavor profiles in soups, sauces, seasonings, and meat analog systems where nuanced aromatic characteristics are desired. Its role as a flavor adjuvant means it can modify the perception of other flavor compounds and improve overall flavor harmonization in culinary applications. Beyond taste, food formulators appreciate its relatively stable sensory impact under various processing conditions, including heat and pH changes, which are common in food manufacturing. Because of its origin in garlic, it aligns well with consumer expectations for natural-tasting savory products and is often paired with other allium-derived compounds to achieve depth of flavor without dominating a formulation. The compound’s inclusion in expert flavor libraries and evaluations by flavor panels reflects its acceptance as a functional flavor ingredient within the food industry. Use levels are guided by flavor development objectives and good manufacturing practice principles, ensuring that the sensory contributions are noticeable yet harmonious within the broader formulation. Its application extends to both traditional food categories and innovative culinary concepts where nuanced savory notes contribute to product differentiation and consumer appeal.

Adi Example Calculation

Because JECFA’s evaluation of S-ALLYL-L-CYSTEINE did not establish a numerical ADI but indicated no safety concern at current intake levels, illustrating a numerical ADI calculation is not appropriate here. In general, when a numeric ADI is established for a food additive, an example calculation might show how intake from food consumption relates to body weight, comparing typical exposure with the ADI. For instance, if a compound had an ADI of X mg per kilogram body weight, a person weighing Y kilograms could theoretically consume up to X times Y milligrams per day without exceeding the ADI. In this case, the absence of a specific numeric ADI reflects a regulatory conclusion that typical exposure levels from flavoring use are not of safety concern, rather than defining a specific threshold value. As with all regulatory evaluations, expert committee reports provide the detailed context for interpreting safety conclusions.

Safety And Health Research

Extensive safety and health research on S-ALLYL-L-CYSTEINE has been undertaken primarily in the context of toxicological evaluations and exposure assessments relevant to its use as a flavoring agent. Expert review by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) concluded that, based on available toxicological and exposure data, there is no safety concern at current levels of intake when used as a flavoring agent. This determination reflects a comprehensive examination of genotoxicity, subchronic toxicity, and other relevant endpoints as documented in the JECFA evaluation reports. Independent scientific literature also describes various biological properties of S-ALLYL-L-CYSTEINE derived from garlic extracts, including antioxidant and anti-inflammatory activities observed in research settings, but such findings are context specific and not part of regulatory safety determinations for food additive use. Safety assessments for flavoring agents focus on potential effects at anticipated dietary exposure levels, with a margin of safety evaluated relative to toxicological benchmarks. Regulatory safety evaluations do not endorse physiological or health benefit claims but focus on ensuring no harmful effects occur at typical use levels. As with all flavor ingredients, continued monitoring of new data and post-market experience informs ongoing safety reviews. Users of ingredient safety information should reference authoritative sources and evaluation reports for detailed toxicological context.

Regulatory Status Worldwide

S-ALLYL-L-CYSTEINE has been evaluated by international expert bodies for its use as a flavoring agent. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) assigned it the JECFA number 1710, evaluating it in a flavoring context and concluding that there is no safety concern at current levels of intake when used as a flavoring agent. This evaluation reflects a review of available toxicological and exposure data and supports its ongoing use in food flavor applications under conditions of good manufacturing practice. The compound is also catalogued with a FEMA GRAS designation under FEMA number 4322, indicating recognition by flavor industry expert panels for generally recognized as safe status in flavor use contexts. In the United States, inclusion in such flavor evaluation lists does not equate to a specific FDA food additive regulation under Title 21 of the Code of Federal Regulations, and direct listing under a specific CFR section could not be confirmed, so explicit regulatory authorization language in CFR is not assigned here. In European Union jurisdictions, the authorization of flavoring substances is governed by EU regulations that require individual evaluation and listing; no specific EU flavoring authorization number (such as a FLAVIS number) could be confirmed at the time of this writing. Regulatory evaluation frameworks generally require adherence to relevant food laws and good manufacturing practices for flavor compounds. As with all flavoring agents, use levels and labeling requirements must comply with applicable local and regional standards, ensuring consumer safety and accurate ingredient representation.

Taste And Functional Properties

S-ALLYL-L-CYSTEINE exhibits distinct sensory characteristics associated with organosulfur compounds, notably contributing savory, roasted, and pungent notes that are reminiscent of garlic and related allium flavors. These sensory attributes make it particularly useful in developing flavor profiles for savory applications. Organosulfur compounds often interact with other flavor constituents to modulate aroma intensity and persistence, and in formulation practice, S-ALLYL-L-CYSTEINE can enhance or smooth out specific taste elements when used in balance with other components. Functionally, this compound is water soluble and exhibits reasonable stability under typical food processing conditions, including moderate heat and a range of pH environments encountered in sauces, broths, and processed savory foods. While some organosulfur molecules can be volatile or sensitive to oxidation, S-ALLYL-L-CYSTEINE’s structural features contribute to a relatively stable presence in finished products, supporting consistent sensory impact. Its interactions with other flavor molecules are complex and depend on concentration, food matrix, and the presence of complementary compounds such as acids, sugars, and other aroma-active substances. These interactions can influence perceived intensity and flavor quality, making careful formulation essential to achieve the desired sensory outcome. When incorporated at appropriate levels, it enhances flavor depth without overwhelming other ingredients. Sensory evaluation by trained panels is often used during product development to calibrate usage levels, ensuring that the functional properties of this compound contribute positively to the overall flavor experience. Because sensory perception is subjective, food developers rely on a combination of analytical and sensory data when integrating S-ALLYL-L-CYSTEINE into commercial formulations.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a regulatory concept used by international expert bodies to indicate the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. It is derived from toxicological studies using conservative safety factors to account for uncertainties and interspecies variability. In the case of S-ALLYL-L-CYSTEINE, JECFA’s evaluation for flavoring use concluded that there is no safety concern at current intake levels, which means that, based on available data, an ADI value was not specifically defined but that exposure from typical flavor use is regarded as safe. This approach is common for flavoring agents where dietary exposure is low and toxicological data support a broad margin of safety. The absence of a defined numeric ADI does not imply unrestricted use; rather, it indicates that expert review supports the conclusion that typical use patterns do not pose risk. It is important for formulators and regulatory professionals to interpret such evaluations within the framework of established food additive standards and to ensure that usage levels are consistent with good manufacturing practices.

Comparison With Similar Additives

S-ALLYL-L-CYSTEINE can be compared with other organosulfur flavoring agents that contribute savory or allium-like sensory attributes. For example, S-allylmercaptocysteine and diallyl disulfide are related organosulfur compounds derived from garlic that also contribute characteristic aromatic notes but differ in volatility and odor intensity. While S-ALLYL-L-CYSTEINE provides smoother, roasted savory nuances, diallyl disulfide is more pungent and intense, often requiring careful balancing in formulations. Another related compound, S-propyl-L-cysteine, offers a milder sulfurous profile and can be used in applications where subtlety is desired. Compared with simple amino acids like cysteine itself (which contributes umami and reducing properties in Maillard reactions), S-ALLYL-L-CYSTEINE adds specific aromatic complexity linked to its allyl substitution. Formulators select among these compounds based on desired sensory outcomes, functional stability, and compatibility with other ingredients. The differences in sensory and chemical behavior illustrate how small structural changes among organosulfur compounds lead to distinct functional roles in flavor design.

Common Food Applications Narrative

S-ALLYL-L-CYSTEINE appears in a range of savory food applications where complex, roasted, or allium-like flavor nuances are sought. In culinary practice, chefs often seek ingredients that can add depth and subtlety to savory profiles, and S-ALLYL-L-CYSTEINE supports these objectives by providing characteristic aromatic notes that complement other seasonings without a sharp or singularly dominant profile. Common uses include incorporation into savory sauces and gravies where layered complexity enhances mouthfeel and aroma, as well as in ready-to-eat meal components where balanced flavor is critical. In snack seasonings, this ingredient can contribute to umami-rich notes that pair well with salt, herbs, and spice blends, enriching the overall eating experience. Processed vegetable-based dishes and meat analog products also benefit from its sensory contributions, helping to mimic the multifaceted profile associated with traditional cooking bases. The ingredient’s versatility extends to seasoning blends for soups, broths, and consommés, where it supports the integration of multiple flavor dimensions. Across these categories, product developers employ S-ALLYL-L-CYSTEINE as part of a broader palette of flavoring agents that work synergistically to deliver desired sensory outcomes. Its inclusion in flavor libraries and expert evaluations underscores its recognized role in flavor creation within the industry. Because food applications vary widely in composition, moisture content, and processing conditions, formulators tailor usage levels and ingredient combinations to achieve the most desirable sensory result. Overall, S-ALLYL-L-CYSTEINE contributes to the broad spectrum of savory flavors found in contemporary food products, aligning with consumer preferences for rich, complex taste profiles.

Safety & Regulations

FDA

  • Notes: No specific FDA food additive regulation section found; flavoring substance status assessed by expert panels but not directly listed under CFR.

EFSA

  • Notes: No specific EFSA flavoring authorization number or numeric ADI could be confirmed from regulatory sources.

JECFA

  • Year: 2007
  • Notes: JECFA concluded that S-ALLYL-L-CYSTEINE poses no safety concern at typical intake; numeric ADI not established.
  • Adi Display: No safety concern at current intake levels when used as a flavoring agent

Sources

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