Effect of Pigment Color Difference in Organic Rice on Antioxidant Activity

Organic Rices, such as Jasmine variety white organic rice, Saodah variety red organic rice, and Java variety black organic rice, are many cultivated by farmer in Indonesia, especially Sleman area, DI Yogyakarta. The potency of three varieties of organic rice as antioxidant source hasn't been studied. Therefore this research was done to know the effect of pigment color difference in three varieties of organic rice on antioxidant activity, especially 1,1-diphenyl-2pycrylhydrazyl (DPPH) radical scavenging activity and ion reducing power. The results showed that Saodah variety red organic rice had the highest antioxidant potency because it had the highest total phenol and total flavonoid, 37.93 mg GAE/g sample dry base and 0.85 mg CE/g sample dry base, respectively. However Saodah variety red organic rice had total anthocyanin lower than that of Java variety black organic rice, 0.0025 mg/g sample dry base and 0.024 mg/g sample dry base, respectively. Anthocyanin compounds identified in three varieties of organic rice were cyanidine-3-glucoside at 32 minute time retention and peonidine -3-glucoside at 37 minute time retention. 1,1-diphenyl-2-pycrylhydrazyl (DPPH) radical scavenging activity and ion reducing power of Saodah variety red organic rice were the highest, 0.90 mg equivalent vitamin E/g sample dry base and 278.28 mg equivalent vitamin E/g sample dry base, respectively.