Malolactic fermentation (MLF) softens harsh acids in wine, influencing style and texture. This article explains its mechanisms and effects.

What is Malolactic Fermentation?

MLF is a bacterial conversion where malic acid transforms into softer lactic acid, reducing tartness.

It commonly occurs in red wines and some fuller-bodied whites to enhance mouthfeel.

Impact on Wine Characteristics

The process yields buttery notes, creamy textures, and sometimes a slight increase in complexity.

It can also influence aroma, introducing subtle dairy or nutty elements.

Controlling MLF

Winemakers carefully manage temperature and timing to encourage or prevent MLF depending on desired style.

Some wines skip MLF to maintain crisp acidity and freshness.

Practical Considerations for Cellar Management

Monitoring bacterial activity is important to avoid spoilage or undesirable flavors post-fermentation.

Proper sanitation and testing support healthy MLF completion.