臭氧降解玉米中赭曲霉毒素A的效果及对玉米脂肪酸的影响

针对粮食贮藏过程中真菌污染造成的食用安全性问题，探讨臭氧在玉米储藏中的应用可行性。以玉米中易污染的赭曲霉毒素A(OTA)为研究对象，在不同质量浓度臭氧，不同处理时间下，考察臭氧对OTA的降解效果，以及对玉米脂肪酸的影响。结果表明：30g/m3臭氧处理120min或者60g/m3臭氧处理90min能将80μg/L的OTA标准品几乎降解完全；利用60g/m3臭氧处理10h能有效的将玉米中污染80μg/kg OTA降解到安全范围(5μg/kg)以下，并且臭氧处理对玉米脂肪酸无显著影响。说明臭氧可有效降解玉米储藏中污染的OTA，并且不会破坏其中的不饱和脂肪酸，初步证明臭氧在玉米储藏中应用的可行性。

Effect of Ozone Treatment on the Degradation of Ochratoxin A and Fatty Acids in Corn

The feasibility of applying ozone in corn storage was analyzed in the present study with the purpose of solving food safety issues caused by mycotoxin contamination during the storage of cereal grains. In the present study, the effects of ozone treatments at the concentrations of 10, 30 g/m3 and 60 g/m3 and exposure time (1－10 h) on the degradation of ochratoxin A (OTA) in corn and its fatty acid composition were explored. The results indicated that OTA at 80μg/L was completely degraded after ozone treatment at 30 g/m3 for 120 min or at 60 g/m3 for 90 min. Corn contaminated with 80μg/kg OTA was degraded to less than 5μg/kg after being treated by 60 g/m3 ozone for 10 h. Ozone had little effect on the fatty acid compostion in corn. Therefore, ozone can be used for the storage of corn as a result of effective degradation of OTA by it.