Yes, lemon juice can go bad, although its high acidity provides some natural preservation. However, the shelf life depends on several factors, including whether it's bottled, freshly squeezed, and how it's stored.
Bottled Lemon Juice
Bottled lemon juice, even with preservatives, will eventually spoil. The level of preservatives varies between brands, so always check the label for expiration dates and storage instructions. While some report using bottled lemon juice months past its expiration date without issue [Reddit Cooking thread, various dates], others note a sour, off-flavor developing [Reddit Cooking thread, Sep 9, 2021]. It's best to use it within the recommended timeframe and to rely on your senses – a change in smell or taste indicates spoilage. [Southern Living, Oct 13, 2024] One user mentioned using a bottle for about 3 months without spoilage, attributing this to the low pH of lemon juice inhibiting microbial growth. [Reddit Cooking thread, Feb 4, 2023]
Freshly Squeezed Lemon Juice
Freshly squeezed lemon juice is more susceptible to spoilage than bottled juice due to the lack of preservatives. While its acidity offers some protection, it won't last indefinitely. Stored properly in the refrigerator, it can last for up to four days; however, the flavor might diminish over time. [Quora, Jan 14, 2017]. Leaving it at room temperature significantly reduces its shelf life.
Signs of Spoilage
Regardless of the type of lemon juice, several signs indicate spoilage:
- Change in color: Discoloration, usually browning or darkening, suggests deterioration.
- Change in smell: A fermented or off-putting odor means the juice has gone bad.
- Change in taste: A sour or unpleasant taste confirms spoilage. (Note that a slightly more sour taste than expected doesn't automatically mean it's spoiled.)
- Mold growth: Visible mold is a clear sign of spoilage and the juice should be discarded immediately.
Storage Tips
Proper storage significantly extends the shelf life of lemon juice:
- Refrigeration: Store both bottled and freshly squeezed lemon juice in the refrigerator.
- Airtight containers: Use airtight containers to prevent oxidation and bacterial growth.
- Freezing: Freshly squeezed lemon juice can be frozen in ice cube trays for extended storage.
