The principle of ordering tofu

Principle of ordering tofu: The brine used for ordering tofu is an aqueous solution of magnesium chloride, which belongs to electrolyte solution. It can neutralize the charge of ions adsorbed on the surface of colloidal particles, and make protein molecules condense to obtain tofu. The purpose of ordering tofu is to solidify protein and separate it from water.

The brine used to order tofu is the mother liquor left in the salt pond after salt is made from seawater or salt lake water. The main ingredients are magnesium chloride, calcium sulfate, calcium chloride and sodium chloride, which tastes bitter. Magnesium chloride crystals precipitated after evaporation and cooling are called halogen blocks, which are commonly used coagulants for making tofu in northern China. Tofu made with brine as coagulant has strong hardness, elasticity and toughness, and is called old tofu, or north tofu and hard tofu.

Extended data

Precautions for ordering tofu:

1, the soaking time of soybean and tofu must be well controlled, not too long, otherwise the pulp will fall off and tofu will not be made.

2. The baking degree of the gypsum used to order tofu must be well mastered. You can see that you have just burned your heart by gently breaking the gypsum with a hammer.

3. Don't mix bean curd residue with soybean milk when squeezing soybean.

4, the heat of tofu should be controlled well, not too fierce, to prevent the soybean milk from overflowing after boiling.

5, the temperature of tofu should be controlled at 80 degrees Celsius, otherwise the tofu will not be successful.

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