Gluten is a part of the wheat kernel, or barley kernel, or corn kernel, and so forth. Naturally, when these items are milled into flour or corn powder, the gluten goes in, too, unless steps are taken to remove it.
Corn Flour Gluten Free?.
For the most part there is no gluten in cornflour or corn flour - cornflour is milled maize (corn), also known as cornstarch in the US. Corn flour is ground maize (corn)....