银耳汤起沫什么原因

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是银耳汤的胶质。

银耳汤再煮的时候表面往往会漂浮的大量的泡沫，但是仔细观察会发现，这些泡沫是比较细密的，并且澄清透明没有杂质，会随着银耳汤的慢慢冷却，汤表面的泡沫也逐渐消散，其实这层泡沫是银耳的胶质。