Processing methods for expired monosodium glutamate

After expiration, it is generally not recommended to continue consuming monosodium glutamate, but it can be safely disposed of through sealed disposal, composting, and other methods. Expired monosodium glutamate may cause clumping, discoloration, or odor. Although it does not produce highly toxic substances, its flavor and safety have been reduced. If unopened expired monosodium glutamate is stored in a dry environment with no abnormalities in appearance, theoretically it can be used for cooking seasoning in the short term, but its freshness will significantly decrease. It is recommended to prioritize checking the integrity of the packaging and observe for moisture, mold, or foreign objects. A small amount of clumping can be restored to a powdery state by grinding, but if it is accompanied by a yellowish color or pungent odor, it may have undergone chemical deterioration and should be immediately stopped from use. Expired MSG that has been opened is more prone to absorbing moisture and microbial contamination, especially in humid southern regions where mold is more likely to grow. This type of monosodium glutamate is difficult to completely kill microbial metabolites even when heated at high temperatures, posing a risk of causing gastrointestinal discomfort. If symptoms such as abdominal pain and diarrhea occur after ingestion, electrolyte solution should be replenished in a timely manner, and medical examination should be sought if necessary.

Proper handling of expired monosodium glutamate requires attention to garbage classification requirements. It is recommended to put it in a sealed bag and dispose of it in other garbage bins to avoid contaminating recyclable materials. A small amount of monosodium glutamate can also be dissolved in water as plant fertilizer, but the concentration needs to be controlled to prevent soil salinization. Daily storage of monosodium glutamate should be stored in a cool and dry place, sealed promptly after use, and preferably used up within six months after opening to maintain the best flavor.