Baking powder is a compound loosening agent, also known as baking powder and baking powder, mainly used as a fast loosening agent for pasta food. But baking powder is a chemical starter, there are two kinds, one is alkaline, the main ingredient is bicarbonate of ammonia, bicarbonate of ammonia; the other is a composite, the main ingredient is alum and ammonium alum. Medical evidence, alum contains aluminum, with chemical baking powder, especially containing alum baking powder is prone to Alzheimer's disease, osteoporosis, cardiovascular disease, etc., is harmful to the human body, and now if you want to buy baking powder, be sure to pay attention to whether it is "non-aluminum baking powder" (product labels on the name of the note); so it is recommended that you use alkaline! The only way to do this is to use alkaline baking powder, which is not harmful to the body.
While baking powder has the ingredient of baking soda, it is precisely tested and added with acidic powder (such as cream of tartar) to balance its pH, so basically, although baking soda is alkaline, but commercially available baking powder is a neutral powder, so baking soda and baking powder can not be arbitrarily replaced. As for cornstarch, which is used as a filler in baking powder, it is mainly used to separate the acidic and alkaline powders in baking powder to avoid their premature reaction. Baking powder should also be stored to avoid moisture and early failure.