Diacetyl is an important flavoring compound that determines specific characteristics of products such as fermented milks and, at very low concentrations (up to 5 mg L−1), is also responsible for the characteristic “buttery” aroma of milk products.9 Furthermore, it is known that while Saccharomyces cerevisiae produces 132.4 mg L−1 acetaldehyde, less than 1 mg L−1 diacetyl is produced during red wine fermentation.