STUDY ON THE EXTRACTION OF ONION PIGMENT AND THE DETERMINATION OF ITS ANTIOXIDATION ACTIVITY

An optimized procedure for the extraction of onion pigment from onion was described.Antioxidation activity of the extracted onion pigment was studied by the Fenton reaction and the method of DPPH (1-diphenyl-2-picrylhydrazino) free radical (·DPPH).As indicated by the experimental results,onion pigment shown scavenging action on both the hydroxyl free radical (·OH) and 1-diphenyl-2-picrylhydrazino free radical (·DPPH) and gave their rates of scavenge of 42.4% and 58.2% respectively.The results of this work provided a sound scientific basis supporting the exploitation of the natural onion pigment for its application in both the food industry and preparation of nutriments.