Brined tofu is a method of making tofu.

The production process is: soak the soybeans in water, swell and soften them, grind them into soy milk, filter out the bean dregs, and cook them.

At this time, the protein globules in the soybeans are constantly moving in the water. If they cannot come together, a colloidal solution is formed.

In order to change the colloidal solution into tofu, it is necessary to order brine.

Brines are for distribution.

Brine mainly contains magnesium chloride, and gypsum is calcium sulfate. They can quickly gather scattered protein pellets together and turn them into white tofu.

Squeeze out the water and the tofu brain becomes tofu.

Tofu and tofu are condensed soy protein.

The reason for ordering tofu with brine: People always soak the soybeans in water, grind them into soy milk and boil it, then add salt brine and add it to the soy milk.

At this time, a lot of white flowers are decomposed, filtered and made into tofu.

Since you can’t drink salt brine, why do you need to use salt brine to make tofu?

It turns out that the main chemical component of soybeans is protein.

Proteins are polymer compounds composed of amino acids. A layer of colloidal substances with the same charge is formed on the surface of the protein to isolate them from each other and prevent colloidal precipitation and sinking due to collisions.

When making brine, because brine is an electrolyte, many small charged particles of positive and negative ions will be differentiated in the water.

Therefore, the hydration of these ions can generate a protein water film.

While the protein is insufficiently dissolved, the positive and negative ions of the salt inhibit the charge on the surface of the protein, reduce the solubility, and the particles aggregate with each other to form precipitation.

At this time, many white things appeared in the soy milk.

There are many electrolytes in salt brine, mainly calcium, magnesium and other metal ions, which will coagulate proteins in the human body. Therefore, if people drink too much salt brine, it will be life-threatening.

Tofu shops sometimes do not use salt brine, but use gypsum to brine.

Same thing.