By Malvina Demaj Last Updated: Mar 6, 2026

Lactic Acid

(lak-tuhk a-suhd)
DEFINITION

Lactic Acid

Lactic acid is a soft organic acid produced during malolactic fermentation (MLF) of wines, when bacteria (Oenococcus oeni) converts harsh malic acid into lactic acid. It smoothens the wine’s total acidity, increases pH and adds creamy, buttery or velvety textures and flavors to wine. Lactic acid can also be added directly to must or wine to act as an acidifier and adjust acidity. It is very important for red wines and white wines like Chardonnay.

Did you know? Diacetyl, the compound responsible for the buttery flavors in wine subjected to MLF, is the exact same compound present in movie theater popcorn.

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