Diacetyl

Diacetyl (CAS 431-03-8), also known as biacetyl or butanedione, is a naturally occurring diketone found in fermented products such as butter, beer, and wine. It carries no assigned E-code but is recognised as a flavouring substance under EU flavouring regulations. Common synonyms include butadione and NSC 8750.

In food and beverage manufacturing, diacetyl functions as a butter and cream flavourant at concentrations typically in the low ppm range, where its diketone structure interacts with taste receptors to produce characteristic dairy notes. In polymer and personal care formulations, its two reactive carbonyl groups enable cross-linking with amine-functional substrates, influencing texture and film formation.

Diacetyl is supplied as a liquid and is available in food-grade quality meeting FCC specifications. It falls under REACH registration requirements within the EU. Procurement enquiries should confirm purity grade, packaging format, and compliance documentation prior to order placement. HS code 29141990 applies for import classification.