As an expert sommelier and brewer, I can confidently say that soju can indeed go bad if not refrigerated properly. Soju, a Korean distilled spirit, is typically made from rice, wheat, or barley, and it contains a relatively low alcohol content compared to other spirits.
When soju is stored in a cool, dark place and the bottle is sealed properly, it can last for several years without significant deterioration. However, once the bottle is opened and the soju is exposed to air and light, its quality may begin to deteriorate. This is because oxygen and light can cause chemical reactions that alter the flavor and aroma of the soju.
Exposure to air can lead to oxidation, which can result in the development of off-flavors and a loss of the original characteristics of the soju. Light, especially UV light, can also contribute to the degradation of the soju. The UV rays can break down compounds in the soju, leading to changes in its flavor profile.
To preserve the quality of soju for as long as possible, it is recommended to store it in a cool, dark place, away from direct sunlight and heat sources. A pantry or a cellar are good options for storage. It is also important to ensure that the bottle is tightly sealed to minimize air exposure.
In some cases, refrigeration can be beneficial for extending the shelf life of soju. Cold temperatures can slow down chemical reactions, including oxidation, and help preserve the original flavors of the soju. However, refrigeration is not absolutely necessary if the soju is stored in a cool, dark place.
It is worth noting that the exact shelf life of soju can vary depending on several factors, including the quality of the soju, the storage conditions, and the specific production techniques used. Some high-quality soju brands may be more resistant to deterioration, while others may be more prone to flavor changes over time.
In my personal experience, I have come across soju bottles that have been stored for several years in a cool, dark place and have maintained their quality quite well. On the other hand, I have also encountered opened bottles of soju that have been left exposed to air and light for an extended period, resulting in noticeable changes in taste and aroma.
To summarize, soju can indeed go bad if not stored properly. While it can last for several years when sealed and stored in a cool, dark place, once the bottle is opened and exposed to air and light, the quality may deteriorate. Refrigeration can help extend the shelf life of soju, but it is not absolutely necessary if the soju is stored in a suitable environment.