What You Need to Know
Salt brine (8–10 % NaCl) creates an osmotic barrier that limits water activity, while lactic acid bacteria (e.g., Lactobacillus plantarum) ferment sugars to lactic acid, lowering pH to 3.5–4.0 over 3–7 days. Acetic acid from vinegar provides a rapid pH drop to 2.5–3.0, acting as an additional preservative.
The Science
Primary Reaction
Fermentation of sugars by lactic acid bacteria producing lactic acid; acidification by vinegar (acetic acid).