What are the key considerations for minimizing diacetyl production during alcoholic fermentation?

Minimizing diacetyl production during alcoholic fermentation requires careful management of several key factors because diacetyl, a vicinal diketone (VDK), imparts a buttery or butterscotch flavor, which is often undesirable in many beverage styles. Diacetyl is produced as an intermediate in the synthesis of valine, an amino acid. Yeast produces alpha-acetolactate as a precursor to valine, and some of this alpha-acetolactate leaks out of the cell. Once outside the cell, alpha-acetolactate undergoes non-enzymatic oxidative decarboxylation, which means it reacts with oxygen to form diacetyl. A healthy f....