Here its introduced a study about the impact of ozone on some types of stored corn (physical conditions), its analyzed the effects that different contact times had with the elimination of plague, fungi, total aflatoxins, oily free acids, index of peroxides and acidity, proximal quality and mineral of the grain. The research was done under a completely experimental randomized design. The work was done in laboratory and pilot level submitting corn to 4 treatments, one works as a witness and the rest of them received a fixed concentration of ozone for 2, 4 and 8 hours. The ozonation was carried out in PVC columns simulating industrial silos. It's demonstrated that the level of mortality of the plague depends on the contact time and concentration; nevertheless the characteristics of the grain have a special importance. The nutritional properties of the grain did not suffer any significant changes and the total aflatoxins were reduced under the action of ozone.
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