Study on the antioxidant activity of fermented soybean meal

In order to study the antioxidant activity of fermented soybean meal,the total antioxidant activity,hydroxyl free radical scavenging rate,and superoxide anion scavenging rate were measured for different concentrations of raw soybean meal,fermented soybean meal and its over 0.22 μm filter samples.The results show that the three indicators were increased with the sample concentration.When the sample concentration was 1.5%,the raw soybean meal,the fermented soybean meal and the filted sample's total antioxidant activity was 27.57 U,46.26 U,102.98 U;hydroxyl radical scavenging rate was 69.40%,69.10%,84.65%;superoxide anion free radical scavenging rate was 19.61%,26.14%,45.49%,respectively.The linoleic acid peroxidation and DPPH free radical scavenging rate of the fermented samples were also increased obviously.With 400 μmol/L Vc as control,the result indicated that the fermented soybean meal had strong antioxidant activity.