Study on Quality Variation of Maize After Unsealing of Controlled Atmosphere with Nitrogen
In the present research,maize with initial mass fraction of 13.7％and 14.5％of moisture was used as the experimental object,and nitrogen with volume fraction of 99％was used for atmosphere control to detect and compare during storage at 20,30 ℃,respectively,with the antioxidant enzyme activity and other qualities of maize after unsealing.The results indicated that during storage for 180 days after unsealing of con-trolled atmosphere with nitrogen air-conditioned group and control group maize of the contents of free fatty acid(FFA)and peroxidase(POD)all declined,the contents of FFA were decreased significantly,and air-conditioned group and control group of the FFA content decreased by 2.67-5.34 µmol/L and 2.09-3.39 μmol/L,respectively;fatty acid value,malondialdehyde content(MDA),superoxide dismutase(SOD),catalase(CAT),ascorbate peroxidase(APX),dehydroascorbate content(DHA)and other indexes showed an increas-ing trend.Among them,the comprehensive evaluation scores of antioxidant enzyme activity in 12 groups were all greater than 0.63,indicating that the antioxidant enzyme activity was better maintained after 6 months of storage at 20 ℃.
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