What is the principle of ordering tofu with brine?

Reaction principle: ignite brine with brine or gypsum. Brine mainly contains magnesium chloride, and gypsum is calcium sulfate, which can make dispersed protein particles quickly gather together (that is, colloid aggregation) and become glistening bean curd. Squeeze the water out again, and the tofu brain will become tofu. Tofu and tofu brain are both concentrated bean protein.

Brine is an aqueous solution of crystallized magnesium chloride, which belongs to electrolyte solution. It can neutralize the ionic charge adsorbed on the surface of colloidal particles, and make protein molecules condense to obtain tofu. ?

Extended data:

Actually, you don't have to order brine tofu. Others have the same effect, such as gypsum, ester acid and citric acid, which can be used to order tofu. In addition, it is worth mentioning that a kind of boxed tofu sold in the market in recent years is white and delicate, and its quality is obviously higher than that made by traditional methods. It turns out that its coagulant uses a new chemical substance-gluconolactone, which is also an example of the application of new technology in food processing.

It is a common coagulant for making tofu in northern China, which can coagulate protein in soybean milk into gel, and analyze the moisture. Tofu made of brine as coagulant has strong hardness, elasticity and toughness, and is called old tofu, or north tofu and hard tofu.

References:

Baidu encyclopedia-bittern tofu