الفهرس 
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Abstract
This investigation aimed to study the possibility of utilization of (ozone gas) as a novel safe practical and efficient agent for inactivation of fungal growth and mycotoxins detoxification in white and yellow corn grain samples collected from 3 different Governorates in Egypt. Collected corn samples had TFC ranged from 35 to 45 for white and yellow corn samples. Ozonation treatment showed noticeable reduction in TFC and percentage of fungal infection with the increasing of exposure time. Aspergillus genus was the most dominant followed by Fusarium genus. The highest total aflatoxins were found with control of the white corn collected from Gharbiya that accounted 27.594 ppb. Aflatoxin B1 was found in the highest amounts for all the tested corn samples. The highest amount of fumonisin was found with the control of yellow corn collected from Cairo Governorates that accounted as 12.482 ppm. The production of aflatoxin from A. flavus reached 1258.1 and 1247.3 µg/kg for white and yellow contaminated corn, respectively. While, the production of fumonisin from F. moniiforme reached 213.25 and 209.88 mg/kg for white and yellow contaminated corn, respectively. Using ozone 40 mg/L for 30, 60 or 180 min led to gradual decrease in toxin production. Ozonation treatment affected positively on the contaminated white and yellow corn diets that increased the food consumption and body weight for all the treated groups. The white and yellow corn contaminated with those mycotoxins caused significant increases in liver enzymes (ALT and AST) as well as lipid parameters in rats, besides deterioration for kidney function. Ozonation treatment for the contaminated white and yellow corn affected positively on the tested serum parameters. The histopathological examination for the different studied groups of rats was carried out for their liver, kidney and testis at the end of the experiments. Diets contained contaminated white or yellow corn, either with aflatoxin or fumonisin, showed malicious histological changes. Ozonated groups showed improvements in the liver, kidney and testis sections. Strawberry samples of the two cultivars Festival and Sweet Charlie (ozonated or non-ozonated) were examined for the presence of different associated fungi, the identification and the fungal frequency occurred of different strawberries. The non-ozonated Sweet Charlie recorded the highest fungal count (232) after 15 days of storage at 5˚C meanwhile it was 191 fungal counts for the non-ozonated Festival samples. Samples of non-ozonated or ozonated Festival and Sweet Charlie were evaluated for their physicochemical properties. Results showed a decrease in the (TA) for all the tested samples either ozonated or non-ozonated and (TSS) decreased with the increasing of storage time, either treated or non-treated with ozone.