Abstract:The antioxidant activity and components of different polar solvent extracts of germinated brown rice were analyzed.Germinated brown rice were extracted with distilled water,methanol,anhydrous ethanol,acetone and petroleum ether.The antioxidant activity was evaluated by DPPH radical scavenging rate,hydroxyl radical scavenging rate,superoxide anion radical scavenging rate and iron ion reduction ability.At the same time,the contents of total phenols,total flavonoids,γ-aminobutyric acid,glycoprotein and polysaccharide in different polar solvent extracts and their effects on antioxidant activity were explored.The results showed that different polar solvent extracts of germinated brown rice had antioxidant activity and showed a dose-effect relationship.The distilled water extract of germinated brown rice had higher DPPH radical scavenging rate,hydroxyl radical scavenging rate and iron ion reduction ability,while the ethanol extract had higher superoxide anion radical scavenging rate.The content of polysaccharide in methanol and acetone extracts of germinated brown rice was the highest,and the content of glycoprotein in distilled water,ethanol and petroleum ether extracts was the highest.The results showed that the contents of polysaccharide and glycoprotein in different solvent extracts had great influence on free radical scavenging activity and iron ion reduction ability.