The nutrients or
trace elements in the maize or corn are generally classified into three groups from a dietary point of view: essential
trace elements (iron, zinc, copper, cobalt, chromium, fluorine, iodine, manganese, molybdenum and selenium); probably essential
trace elements (nickel, tin, vanadium, silicon, boron) and the non-essential
trace elements (aluminum, arsenic, barium, bismuth, bromine, cadmium, germanium, gold, lead, lithium, mercury, rubidium, silver, strontium, titanium and zirconium) Afzal et al.2016); Gwirtz and Garcia-Casal (2014); Major et al.