L-ALANYL-L-GLUTAMINE

CAS: 39537-23-0 FLAVORING AGENT OR ADJUVANT

L-alanyl-L-glutamine is a chemically synthesized dipeptide used as a flavoring agent or adjuvant and evaluated by international food additive experts as having no safety concern at current intake levels.

What It Is

L-alanyl-L-glutamine is a synthetic dipeptide composed of the amino acids L-alanine and L-glutamine linked by a peptide bond. It is identified by CAS number 39537-23-0 and appears in food additive evaluations as a flavoring agent or adjuvant. In food science contexts, flavoring agents are substances added to impart or modify taste or aroma. As a dipeptide, L-alanyl-L-glutamine can contribute to umami and savory profiles in complex food systems. The compound is sometimes referred to by a range of synonyms, including Ala-Gln and alanylglutamine, reflecting its chemical structure and functionality in formulations. In international food additive evaluations, L-alanyl-L-glutamine has been assessed for safety as a flavoring agent. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) reviewed this compound and concluded that there was no safety concern at current levels of intake when used as a flavoring agent, illustrating regulatory consideration of both its chemical nature and practical exposure in foods. While used in a regulatory context primarily as a flavoring agent or adjuvant, L-alanyl-L-glutamine is also recognized in contexts outside food for its nutritional and biochemical characteristics. This range of identities and uses underscores the importance of understanding both the technical nature of the dipeptide and the specific context in which it is used. The classification of L-alanyl-L-glutamine as a flavoring agent or adjuvant differentiates it from other food additives that might act as preservatives, coloring agents, or emulsifiers. Its primary role is tied to sensory profiles, aligning with its function in enhancing or modifying flavor components in foods. This functional categorization helps food scientists and regulatory professionals place L-alanyl-L-glutamine within broader additive frameworks and apply appropriate safety and quality considerations in product development.

How It Is Made

L-alanyl-L-glutamine is produced through chemical synthesis, typically involving peptide bond formation between the amino acids L-alanine and L-glutamine. This process is carried out under controlled laboratory conditions to yield a dipeptide with consistent purity and functionality. Chemical synthesis of dipeptides such as L-alanyl-L-glutamine allows manufacturers to produce a stable compound that resists degradation in aqueous and high-temperature conditions relative to free L-glutamine. In food science and industrial settings, this stability is important for consistent performance in formulations. In peptide synthesis, protecting groups may be used to guide the formation of the peptide bond and ensure the correct stereochemistry of the product. After synthesis, purification techniques such as crystallization and chromatography help isolate L-alanyl-L-glutamine at high purity, removing byproducts and residual reagents. The purified product is often characterized through analytical methods such as high-performance liquid chromatography (HPLC) and mass spectrometry to verify identity and concentration. Reference standards for L-alanyl-L-glutamine have specifications set by organizations such as the United States Pharmacopeia (USP), which define acceptable purity ranges and analytical criteria for quality control in laboratory and industrial contexts. The manufacture of food-grade peptides like L-alanyl-L-glutamine must also adhere to good manufacturing practices (GMP) and relevant regulatory frameworks depending on the intended use. While the synthesis process itself is chemical, its application in food or nutrition products requires meeting standards for safety, labeling, and quality. This includes ensuring the compound is free of contaminants and consistent with its functional role. The synthesis and purification steps are designed to produce a compound that can be reliably incorporated into food products where flavoring or ancillary sensory effects are desired, supporting product consistency and consumer acceptance.

Why It Is Used In Food

L-alanyl-L-glutamine is used in food primarily for its role as a flavoring agent or adjuvant. Flavoring agents are added to foods to enhance, modify, or introduce specific taste characteristics without significantly altering nutritional content. In this context, L-alanyl-L-glutamine can contribute to savory or umami profiles, which are important in many culinary applications. The choice of this dipeptide as a flavoring agent stems from its chemical properties and its ability to blend with other flavor components to achieve desired sensory outcomes. Beyond direct taste contribution, dipeptides like L-alanyl-L-glutamine can interact with other ingredients to enhance overall flavor complexity. In formulations that aim to mimic savory or protein-rich profiles, incorporating specific peptide-linked amino acids can provide nuanced sensory effects that free amino acids alone might not achieve. For example, the presence of an alanine-glutamine bond can influence how the compound breaks down during cooking or processing, subtly affecting the release of taste-active components. Food scientists and formulators use L-alanyl-L-glutamine in combination with other flavoring agents, seasonings, and functional ingredients to create products that meet specific sensory targets. The ability to fine-tune flavor profiles using compounds such as L-alanyl-L-glutamine expands the toolkit available for product development. This is particularly useful in savory snacks, sauces, soups, and other products where rich taste is a key attribute. Its use as an adjuvant highlights its role in supporting flavor delivery systems and enhancing the overall taste experience for consumers.

Adi Example Calculation

This illustrative example demonstrates how acceptable daily intake (ADI) concepts might be applied in general. Suppose a hypothetical ADI of X milligrams per kilogram of body weight per day were established for a flavoring agent. For a person weighing Y kilograms, the ADI would be calculated by multiplying the numeric ADI by the body weight. For example, if an ADI were X mg per kg and a person weighed Y kg, the total allowable daily intake would be X times Y milligrams. This hypothetical scenario helps clarify how regulators relate ADI values to real-world exposure. In the case of L-alanyl-L-glutamine, an explicit numeric ADI has not been established because evaluations concluded there is no safety concern at current intake levels when used as a flavoring agent. Therefore, this calculation remains illustrative rather than specific to this compound.

Safety And Health Research

Safety research on L-alanyl-L-glutamine has focused on its toxicological profile and potential exposure scenarios relevant to food use. International evaluations such as those conducted by JECFA consider data on absorption, metabolism, and toxicology to determine whether a compound raises safety concerns at levels typical of human consumption as a flavoring agent. In the case of L-alanyl-L-glutamine, the committee’s conclusion of no safety concern at current intake levels indicates that available evidence did not identify adverse effects in standard use contexts. This assessment incorporates understanding of how the compound is metabolized in the body and existing data on exposure from food applications. Toxicological evaluations typically examine endpoints such as genotoxicity, subchronic toxicity, reproductive and developmental effects, and potential for accumulation in tissues. For L-alanyl-L-glutamine, its metabolic fate as a dipeptide that breaks down into constituent amino acids aligns with normal physiological processing of dietary proteins and peptides. The absence of identified hazards at typical exposure levels supports its consideration as a safe flavoring agent when used within established practice. However, specific numeric safety thresholds such as acceptable daily intake (ADI) values have not been formally established by all regulatory authorities, reflecting the assessment that the compound does not pose appreciable risk under typical use. In addition to regulatory evaluations, scientific research on dipeptides such as L-alanyl-L-glutamine explores biochemical functions in other contexts, including nutrition and cell physiology. While these studies provide broader insights into the compound’s behavior in biological systems, they do not directly inform food additive safety assessments. Regulatory evaluations remain focused on exposure relevant to food use and available toxicological evidence. The conclusion of no safety concern at current intake levels reflects the integration of multiple lines of evidence in expert assessments.

Regulatory Status Worldwide

L-alanyl-L-glutamine has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), an international expert group that assesses safety of food additives. According to the JECFA evaluation, the compound was reviewed in 2012 and the committee concluded that there was no safety concern at current levels of intake when used as a flavoring agent. This evaluation reflects an assessment of available toxicological and exposure data in the context of typical use in foods. The JECFA evaluation serves as a reference point for many national and regional regulatory frameworks when considering the inclusion of flavoring agents in food products. In the United States, the Food and Drug Administration (FDA) maintains inventories of substances added to food, including flavoring agents. However, inclusion in such inventories does not automatically confer approval, and specific regulatory status may depend on formal listings in relevant CFR sections or affirmed Generally Recognized as Safe (GRAS) status. Searches of FDA food ingredient inventories do not provide explicit approval status for L-alanyl-L-glutamine, and it is not listed in specific CFR sections for direct food additive approval. Therefore, its regulatory status in the U.S. context remains defined by expert evaluations and industry practice rather than a specific additive regulation. The FDA’s framework for GRAS substances and flavoring agents guides how such compounds are used and labeled in food products. In other jurisdictions, regulatory approaches can vary. The European Union’s food additive regulations include detailed lists of permitted additives with assigned E numbers. L-alanyl-L-glutamine does not currently have an assigned E number, indicating it is not specifically listed in the EU’s permitted additive schedules. Food safety authorities in individual countries may consider international evaluations such as JECFA’s findings when assessing the suitability of flavoring agents in national markets. Overall, the global regulatory landscape for L-alanyl-L-glutamine reflects reliance on scientific evaluations of safety rather than uniform additive listings in all regions.

Taste And Functional Properties

L-alanyl-L-glutamine exhibits taste and functional properties that make it suitable as a flavoring agent in food formulations. Sensory descriptions of peptides often emphasize their contribution to savory and umami taste profiles, which are associated with amino acids and peptide-linked compounds. The umami taste is recognized as one of the basic taste sensations and is commonly linked to glutamate-containing compounds. In the case of L-alanyl-L-glutamine, the glutamine component contributes to this sensory effect, while the alanine residue can influence overall taste perception. From a functional standpoint, L-alanyl-L-glutamine is highly soluble in water and stable under a range of processing conditions. Stability to heat and pH changes is an important attribute for flavoring agents used in cooked or processed foods. Unlike free amino acids that may degrade or interact unpredictably under high temperatures, dipeptides such as L-alanyl-L-glutamine maintain structural integrity, ensuring consistent performance throughout manufacturing and cooking. This stability also supports predictable flavor release during consumption. The sensory impact of L-alanyl-L-glutamine must be considered in the context of the entire formulation. While it can enhance savory characters, its flavor contribution is subtle and is often balanced with other taste components. Its functional properties also extend to solubility and stability in complex food matrices, making it a versatile tool for food scientists and flavorists. The dipeptide’s ability to maintain performance across a range of conditions helps ensure consistent product quality and consumer experience.

Acceptable Daily Intake Explained

The concept of acceptable daily intake (ADI) is used in food safety to express the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. ADIs are typically established based on toxicological studies and incorporate safety factors to account for uncertainties. In the case of L-alanyl-L-glutamine, international evaluations such as those by JECFA concluded that there was no safety concern at current intake levels when used as a flavoring agent, and therefore an explicit numeric ADI was not deemed necessary. This reflects the assessment that typical exposures from food use are well below levels associated with adverse effects. When numeric ADIs are established for food additives, they provide a benchmark for regulators, industry, and risk assessors to evaluate whether consumption patterns pose potential health risks. An ADI is expressed in milligrams of the substance per kilogram of body weight per day and incorporates safety factors derived from animal studies or other relevant data. In the absence of a numeric ADI for L-alanyl-L-glutamine, food scientists and regulatory professionals rely on expert evaluations and typical use levels to ensure that exposures remain within safe bounds. The conclusion of no safety concern at current intake levels indicates that, based on available evidence, routine consumption as a flavoring agent is not expected to pose health risks. For lay readers, it is important to understand that an ADI is not a recommended intake level but rather a conservative threshold used in regulatory assessments. When a compound is concluded to present no safety concern at current intake levels, it suggests that typical dietary exposure is sufficiently low relative to any potential hazards identified in toxicological studies. In practical terms, this means that products containing L-alanyl-L-glutamine as a flavoring agent can be formulated and consumed without exceeding thresholds of concern as evaluated by expert bodies.

Comparison With Similar Additives

When comparing L-alanyl-L-glutamine with other flavoring agents, it is useful to consider both structure and function. Simple amino acids such as monosodium glutamate (MSG) are widely used to impart umami taste due to their free glutamate ion, which interacts with taste receptors. Peptide-linked compounds like L-alanyl-L-glutamine provide a more complex sensory contribution that can support savory profiles without relying solely on free glutamate. This difference in structure influences how the compounds behave in food systems and their sensory impact. Other dipeptides and peptide-linked additives, such as glycine-based dipeptides, have been explored for flavor enhancement and functional properties in food formulations. Each peptide’s specific amino acid composition influences its taste profile, solubility, and stability. Compared to these additives, L-alanyl-L-glutamine offers a balance of solubility and heat stability, supporting consistent flavor contribution even under processing conditions. These comparative considerations help food scientists choose appropriate additives based on sensory goals and formulation requirements. Understanding how different compounds interact with taste receptors and food matrices guides effective formulation strategies and supports product quality.

Common Food Applications Narrative

L-alanyl-L-glutamine finds application in various food products where savory or umami taste profiles are desired. In the broader food industry, flavoring agents serve to enrich taste experiences without altering the basic nutritional composition of the product. For example, soups, sauces, and seasonings often rely on a combination of amino acid-derived compounds and peptides to achieve a rich, full-bodied flavor profile. L-alanyl-L-glutamine can be incorporated into such products to support these sensory goals while maintaining stability through processing. In ready-to-eat meals and prepared foods that undergo thermal processing, the stability of L-alanyl-L-glutamine helps retain intended flavor effects even after heating. This is particularly valuable in products like canned soups, stews, and sauces, which are expected to deliver consistent taste upon opening. Culinary bases and bouillon products that emphasize savory taste may also include specific peptide-linked amino acids to enrich flavor complexity. In snack seasonings and condiments, blending compounds such as L-alanyl-L-glutamine with other flavor enhancers supports balanced sensory attributes sought by consumers. The use of L-alanyl-L-glutamine is not limited to traditional savory products. In functional food and beverage categories, where taste enhancement must coexist with health-conscious formulation, flavoring agents help mask undesired bitter or off-notes from protein hydrolysates or plant-based ingredients. Peptide-based flavoring agents can contribute to palatability without contributing sweetness or saltiness, expanding formulation options. Across these applications, the dipeptide’s role as a flavoring agent or adjuvant complements broader strategies in food product development focused on taste, stability, and consumer satisfaction.

Safety & Regulations

FDA

  • Notes: Specific FDA food additive approval status not found in CFR listings; only JECFA evaluation available.

EFSA

  • Notes: EFSA specific additive evaluation not found.

JECFA

  • Year: 2012
  • Notes: JECFA concluded no safety concern without specifying a numeric ADI.
  • Adi Display: No safety concern at current intake levels

Sources

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