Study on the antioxidant activity of the proteins from jellyfish Cyanea nozakii Kishinouye

In this study,the antioxidant activity of proteins from jellyfish,Cyanea nozakii Kishinouye,was determined by various antioxidant assays,including hydroxyl radical-scavenging,superoxide anion radical-scavenging,reducing power and metal chelating activity.The proteins showed a strong scavenging activity on hydroxyl radical and the scavenging effect was 85% at the concentration of 41 μg/mL.However,the proteins had a low scavenging effect on superoxide anion radical,and the scavenging effect of the proteins didn't reach 50% at the concentration of 77.7 μg/mL.The proteins showed a strong reducing power,but had no metal chelating activity.The radical scavenging activity was stable at a high temperature.The results showed that the hudrosulfide contained in CP wasn't the mainly factor on the antioxidant activity.