How long does the fungus expire and cannot be consumed

Dried black fungus can be stored for 1-2 years in a sealed and dry environment, and the soaked black fungus should be refrigerated for no more than 24 hours. The deterioration of black fungus is mainly manifested by mold spots, sticky feeling or sour and rotten taste. It is forbidden to consume it when these characteristics appear. Unopened dried fungus has a longer shelf life, and should be stored in a damp and high-temperature environment. Dried black fungus with intact packaging should be placed in a cool and ventilated place, and can usually maintain its quality for more than 18 months. If dried fungus is found to have yellow color, insect infestation, or packaging leakage, it should be discarded even if it has not reached the expiration date indicated. The soaking process is a key step for the safe consumption of Auricularia auricula. It is recommended to control the soaking process in cold water within 4 hours and in warm water for no more than 2 hours. Long soaking time can lead to the proliferation of microorganisms, and soaking for more than 6 hours at room temperature in summer poses a risk.

Be alert to rapid deterioration in special circumstances. If the soaked fungus comes into contact with oil or raw water, the decay rate will significantly accelerate. Some people mistakenly soak fungus in stainless steel pots, and the catalytic effect of metal ions may cause fungus to produce toxins such as glycolic acid within 12 hours. If the cooked fungus dishes are not refrigerated in time, they may spoil if left in an environment above 30 ℃ for more than 4 hours. Freezing storage can damage the cell structure of Auricularia auricula, and after thawing, the taste deteriorates and it is more prone to spoilage. It is not recommended to use this method to extend the shelf life. Correctly preserved black fungus can retain most of its nutritional components, including polysaccharides and soluble dietary fiber. It is recommended to use breathable gauze bags or ceramic jars for daily storage, and regularly check for moisture and clumping. When purchasing, choose high-quality fungus with intact petals and clear fuzz on the back. Poor quality products are more likely to mold prematurely. For individuals with special physical conditions, they can be blanched in diluted salt water for 1 minute before consumption to further kill bacteria. For those with weak digestive function, the single intake should be controlled within 50 grams. If symptoms such as nausea and vomiting occur due to ingestion of spoiled black fungus, immediate medical attention should be sought for gastric lavage.