Aflatoxins and cyclopiazonic acid producer strains supressed by aqueous ozone

Ozone is a potential antioxidant substance with effect against microorganism. Four ozone concentrations (0, 1, 10 and 20 mg/L) were applied for 10 minutes to Aspergillus flavus and A. parasiticus spores suspensions (103 cfu/mL). Aqueous ozone was effective against both isolates at the lowest ozone concentration tested. Under the tested conditions, spores inactivation was from 91 to 100%. All ozone treatments performed effective fungi control. The two isolates used in these assays were screened for mycotoxin production by HPLC. The A. flavus strain produced cyclopiazonic acid and Aflatoxin B1 and the A. parasiticus strain produced Aflatoxins B1, B2, G1 and G2. The ozone effect on these mycotoxins was not evaluated