2,3-Butanedione (Diacetyl) CAS 431-03-8 FEMA 2370 - Premium Butter Flavoring Agent for Food & Beverage Industry

2,3-Butanedione, commonly known as diacetyl, is an organic compound with the molecular formula C₄H₆O₂ and a molecular weight of 86.09 g/mol . This simple alpha-diketone is characterized by its two carbonyl groups located at the second and third carbon atoms of the butane chain . It appears as a clear yellow to yellowish-green liquid with a powerful, diffusive, and intensely buttery aroma, especially noticeable in very dilute solutions . As a prized ingredient in the flavor industry, it is officially recognized as a safe flavoring substance by the Flavor and Extract Manufacturers Association (FEMA) under number FEMA 2370 and has been evaluated by the Joint FAO/WHO Expert Committee on Food Additives (JECFA) with the number JECFA 408 . In the United States, it is listed in the FDA's Substances Added to Food inventory under 21 CFR 184.12786

2,3-Butanedione occurs widely in nature, although typically in trace amounts . It is a natural by-product of fermentation, produced as yeast and lactic acid bacteria break down sugars, which is why it is found in beer, wine, and various dairy products . It has been identified in numerous natural sources, including the essential oils of lavender, lavandin, and Réunion geranium, as well as in the aromas of raspberry, strawberry, and various cheeses, yogurt, milk, butter, chicken, beef, coffee, and tea . During fermentation, it contributes a slippery texture to drinks at low levels and a butterscotch-like flavor at higher concentrations 

Applications in the Flavor Industry

As a potent flavoring agent, 2,3-Butanedione (FEMA 2370) finds extensive use in creating natural and complex flavor profiles across numerous food categories:

Dairy Products: This represents the dominant application segment, where the compound is essential for creating characteristic buttery and creamy flavor notes in butter, margarine, cheese, yogurt, and cultured dairy items .

Baked Goods and Confectionery: It is widely used in butterscotch, caramel, chocolate, toffee, and nut flavors, as well as in cake batters, cookies, and pastries where authentic butter notes are desired .

Beverages: Applications include cream sodas, dairy-based drinks, and certain alcoholic beverages where creamy mouthfeel and flavor are sought .

Savory Applications: It contributes to cheese flavors, meat products (such as sausages and processed meats), and savory snacks, adding depth and richness to the profile .

Microwave Popcorn: Perhaps its most famous application, diacetyl is used to impart the characteristic buttery aroma and taste that consumers associate with movie-theater style popcorn .

Fruit and Other Flavors: It finds use in berry flavors (raspberry, strawberry), honey, nut, and even coffee flavor compositions, adding complexity and realism .

The global market for 2,3-butanedione was valued at approximately USD 126.5 million in 2024, with projected growth driven by increasing demand for processed foods and enhanced flavor profiles, particularly in emerging economies .

In perfumery, 2,3-Butanedione finds some use, primarily in the reconstruction of essential oils and flower absolutes. Lavender, lavandin, bay, orris, and many other oils contain traces of this ketone, making it valuable for creating authentic, nature-identical fragrance compositions .

Beyond its primary role in flavors and fragrances, 2,3-Butanedione serves various other purposes:

Chemical Intermediate: It is utilized in organic synthesis for producing heterocyclic compounds, including triazine and pteridine ring systems through cyclocondensation with amines .

Biochemical Research: It is used as a reagent for modifying arginine residues in proteins and for inactivating aminopeptidase-N in enzymatic studies .

Gelatin Hardener: It finds application as a hardening agent for gelatin in photographic and pharmaceutical applications .