Doughnuts are an inseparable delicacy in our national daily life, which has a unique flavor and is mostly on our breakfast table. Maybe you may have heard that some black-hearted vendors use laundry detergent as an ingredient in squeezing doughnuts, which is why the doughnuts are fried so crispy and attractive. Such rumors are spreading by word of mouth in more and more communications, causing many people to shy away from doughnuts. Actually it is not possible to use laundry detergent to fry doughnuts. A lab has done experiments on this, explaining how it works. The main ingredients of laundry detergent are a combination of bleach, surfactants and water softeners. The surfactant in it does indeed fluff up the dough, which is largely dependent on its main ingredient, sodium alkylbenzene sulfonate. Sodium alkylbenzene sulfonate is at work. It can have a strong foaming ability, so it's often used as a foaming agent that can puff up wet dough laundry detergent better. But it can't make the doughnuts more crispy in the process of deep-frying, because it's after the high temperature, it's chemical form will change, the original surfactant in the dough after losing the stable water environment, breaking the balance, so in the high-temperature environment, the bubbles disappeared, instead of fluffy effect, and even make the flavor of the doughnuts smell unpleasant. Doughnuts can expand after frying, because of the addition of a certain fluffing agent, usually alum, alum is a water sister acidic complexion. Baking soda is alkaline when it meets water, and the two dissolve in water after a chemical reaction will occur, producing a large amount of carbon dioxide and flocculent, thus making the dough fluffy. And this reaction reacts quickly at high temperatures to produce large amounts of carbon dioxide gas. But the doughnuts can not be often long-term use, because the puffing agent contains a certain amount of metal elements, this element if a large number of intake of the body on the human organism aspects of the negative impact, and even serious will lead to metal poisoning. Therefore, said with washing powder fried doughnut is false, we can rest assured that the use of doughnuts , do not have to worry about the black hearted vendors in order to save money and put the washing powder down, this rumor is blackmail.