Yes, mayonnaise can go bad after being refrigerated for some time, especially if it has been stored improperly or past its expiration date. The main reason for mayonnaise going bad is the growth of bacteria or spoilage microorganisms.
Mayonnaise is made from ingredients like eggs and oil, which provide a suitable environment for bacteria to grow. Even though commercial mayonnaise products contain preservatives to extend their shelf life, these preservatives have their limits. Once the mayonnaise container is opened and exposed to air, it becomes more susceptible to contamination.
Factors that can contribute to mayonnaise going bad include:
Contamination: If a utensil or finger touches the mayonnaise and introduces bacteria, mold, or other pathogens, it can lead to spoilage.
Temperature fluctuations: If the mayonnaise is not consistently refrigerated at the recommended temperature, bacteria can multiply more rapidly.
Time: Over time, bacteria can multiply and cause the mayonnaise to spoil, even if it has been stored correctly.
Signs that mayonnaise has gone bad include an off smell, unusual texture (separation or curdling), mold growth, or a sour taste. If you notice any of these signs, it's best to discard the mayonnaise to avoid the risk of foodborne illness.
To maximize the shelf life of mayonnaise, always store it in the refrigerator, keep the lid tightly closed, and check the expiration date on the packaging before use. If you are unsure about the freshness of your mayonnaise, it's better to be safe and replace it with a new container.