Is sourdough bread safe to eat if it smells like vinegar?

Troubleshooting Sourdough Stench

Over-Fermentation and Acetic Acid

A strong vinegar smell in sourdough bread often indicates that the fermentation process has gone too far, producing excessive amounts of acetic acid. This can happen when the starter culture is too active, the dough is over-proofed, or the environment is too warm. To check for over-fermentation, look for signs such as a dough that’s excessively bubbly, sticky, or has a sour, pungent aroma.

Acetic Acid Threshold

In general, sourdough with a vinegar smell has likely reached or exceeded the 3-4% acetic acid threshold, which can make it inedible. For comparison, most commercial breads have acetic acid levels around 0.1-0.5%. If you’re unsure, you can test the acidity levels using pH paper or a pH meter.

Corrective Actions

If you suspect over-fermentation, stop the process immediately and discard the dough. To prevent this issue in the future, try to maintain a consistent temperature and proofing schedule, ensure the starter culture is balanced, and monitor the dough’s acidity levels. If the bread already has a vinegar smell, it’s best to err on the side of caution and discard it to avoid foodborne illness.