If there is no starch to make, soften the wheat flour into dough and wash it directly in water. When the dough does not shrink after washing, the remaining dough is gluten and starch is in water. Just let the water stand properly until it is clear and turbid, and then slowly pour out the upper layer of water, and the remaining sticky substances will be dried or dried to obtain starch.
Precautions:
Wash wheat flour and dough directly in water until the volume of dough is no longer reduced, and the remaining dough is gluten and starch is in water. Let stand and precipitate. When the turbidity is separated, you can reflect, and slowly pour out the water on the upper layer. The sticky substance below is dried or dried into starch.
When flour is used, it is brewed with boiling water to make it gelatinized and sticky, and then it can be used as dough. The gelatinized starch can also be used as an adhesive, which is natural and environmentally friendly and firm, but it is easy to get moldy in high temperature and high humidity environment.
Using potatoes or sweet potatoes as pulp, or using mung bean powder as dough, you can also make corresponding flour, but it is difficult to get gluten.
Above content reference: Baidu Encyclopedia-Components