Soak in cold water for 1-2 hours to reach the best soaking state of auricularia auricula, and the soaking process is best stored in refrigerator to reduce bacterial reproduction.

It can also be soaked in hot water, which can not only speed up the speed, reduce the soaking time, but also inhibit the growth of bacteria.

Experts remind that water should be changed frequently during the foaming process to avoid turbidity, stickiness and odor. If it is found that their surfaces are sticky or have peculiar smell, it means that microorganisms have multiplied and must be thrown away without regret. Don't soak too much fungus at one time, and eat it on the day of soaking.

Extended data:

Fresh auricularia auricula can't be eaten, because it contains a substance called porphyrin. After being eaten by sunlight, it will cause plant solar dermatitis, which will cause itching, redness, itching and pain of the skin. Therefore, auricularia auricula needs to be made into dried products in the sun, and the porphyrin can be decomposed before eating.

Dry fungus itself is non-toxic. Under normal circumstances, qualified dry fungus can be eaten cold after soaking, frying and blanching. The reason why there is "poisoning" is that the fungus is contaminated by microorganisms because of the long foaming time.

In the case of high environmental temperature, the fungus (including tremella, shiitake mushrooms, mushrooms and other fungi), cereal fermented products (such as wet rice noodles, wet rice noodles, Ciba, vinegar jelly, etc.) and potato products are likely to be contaminated by a kind of bacteria called Pseudomonas cocoanum.

This bacterium itself is not fatal, but it can produce two deadly toxins, namely, mycotic acid and toxoflavin. The toxin "Oryzanol" is heat-resistant, which can not be destroyed by ordinary cooking methods, and can still cause food poisoning after being heated and eaten.

The onset of food poisoning caused by mycotoxin is acute, and the incubation period is generally 30 minutes-12 hours, and a few days as long as 1-2 days.

References:

People's Daily Online-Is auricularia auricula poisonous after soaking for a long time?