Described herein is a corn protein product comprising greater than about 20% corn protein on a dry weight basis and a free sulfite concentration of less than 150 ppm on an as-is basis. Also disclosed herein is a method to obtain this corn protein product including the steps of providing a protein-rich stream derived from a wet corn milling operation, wherein the protein-rich stream comprises greater than 20% corn protein on a dry weight basis, and treating the protein-rich stream with an oxidant, preferably hydrogen peroxide.