E270 – Lactic Acid
PreservativeDescription
Hygroscopic, colorless or yellowish, syrupy liquid or white to light yellow crystalline solid; produced by fermentation of carbohydrates or synthetically
Notes
Lactic acid is a natural compound produced when beneficial bacteria ferment carbohydrates (sugars and starches) in the absence of oxygen. You might recognize this process from making yogurt, sauerkraut, or sourdough bread, where naturally occurring bacteria break down sugars and produce lactic acid as a byproduct. Commercially, it's made by fermenting simple sugars from sources like corn, beets, or cane sugar using specific strains of bacteria, then purifying the resulting lactic acid into a clear, colorless liquid. As an acidulant, lactic acid adds tartness to foods and helps preserve them by creating an acidic environment that harmful bacteria don't like. It provides a clean, sharp sour taste that's less harsh than other acids like citric acid from lemons. You'll find lactic acid in an enormous variety of foods: it naturally occurs in fermented products like yogurt, cheese, pickles, and kimchi, and it's added to candies for sourness, soft drinks for tang, processed meats for preservation, and baked goods to improve texture and shelf life. Lactic acid can be produced naturally through fermentation (making it suitable for those preferring natural additives) or manufactured synthetically, though both forms are chemically identical. It's suitable for vegetarians and vegans when produced through fermentation of plant materials, which is the most common commercial method. Interestingly, your own muscles produce lactic acid during intense exercise - it's the same compound that causes that burning sensation when you work out hard. It's one of the safest and most widely accepted food additives, with no significant health concerns for the general population.