What elements is corn starch made up of?

A type of flour milled from dried kernels of yellow corn. It is similar to cornmeal except that it is ground to a finer consistency than cornmeal. It is used to make cornbread, muffins, pancakes, polenta, and tortillas. Corn flour is very useful for gluten-free quick breads. Because corn flour contains no gluten, it must be blended with wheat flour when preparing yeasted breads