Methionyl Butyrate

Methionyl butyrate (CAS Number: 16630-60-7) is a synthetic ester flavoring agent created by the chemical combination of methionine, a naturally occurring amino acid, and butyric acid, a short-chain fatty acid. This compound belongs to the class of flavor compounds known as esters, which are widely used in food manufacturing to create complex flavor profiles. The molecular structure allows it to contribute distinctive savory and umami-like characteristics to finished food products.

Methionyl butyrate is primarily employed as a flavoring agent in processed foods where savory, meaty, and cheese-like flavor notes are desired. It may be used in soups, broths, meat-flavored snacks, cheese products, savory sauces, and other processed food applications. As a flavoring adjuvant, it works synergistically with other flavor compounds to enhance overall flavor complexity and consumer appeal. The compound is typically used in very small quantities—measured in parts per million—which is standard practice for synthetic flavor ingredients.

Methionyl butyrate has not been designated as Generally Recognized as Safe (GRAS) by the FDA, which means it has not undergone the formal GRAS notification process. However, this designation does not indicate that the compound is unsafe; rather, it reflects the regulatory pathway and approval status. Notably, there are zero adverse events reported to the FDA associated with this additive and zero recalls related to its use in food products.

The components of methionyl butyrate—methionine and butyric acid—are individually recognized as safe when used appropriately. Methionine is an essential amino acid commonly found in protein-containing foods, while butyric acid is a naturally occurring short-chain fatty acid present in foods like butter and some fermented products. The esterification process creates a stable compound with distinct properties from its individual components.

Data on this specific compound remains limited in the published scientific literature, which is not uncommon for synthetic flavoring agents used in small quantities. The absence of reported adverse events and recalls suggests no significant safety concerns have emerged from its use in food applications.

In the United States, methionyl butyrate is not on the FDA's GRAS list, meaning it may only be used in foods under specific regulatory frameworks or may require notification to the FDA for use consideration. Manufacturers considering its use must comply with applicable food additive regulations and may need to submit data supporting its safety for the intended use.

Regulatory status may vary internationally. The European Union and other regulatory bodies maintain their own approval processes for food flavoring agents. Interested parties should verify the approval status in their specific jurisdiction before manufacturing or importing products containing this ingredient.

Limited published scientific literature specifically addresses methionyl butyrate in isolation. Most flavor research focuses on broader ester classes or naturally derived flavor compounds. The safety profile of similar methionine-derived and butyrate-based compounds, as well as the known safety of their parent compounds, provides some context, though specific toxicological studies on methionyl butyrate itself are not readily available in public databases.

The lack of adverse event reports and recalls despite its use in food products suggests adequate safety margins in practical application, though comprehensive published safety assessments would require access to proprietary manufacturer data or formal regulatory submissions.