Abstract: This paper deals with the scavenging effects of zingerone, dehydrozingerone and gingerol oxime on superoxide anionfree radical (SARF) and 1,1-diphenyl-2-picrylhdrazyl (DPPH)free radical. The results show that both zingerone anddehydrozingerone have a noticeable ability to scavenge both of the two free radicals. The more their content, the higher theirabilities are. The ability of gingerol oxime on the SARF scavenging is not obvious. All those results indicate that Zingerone is oneof these constituents in fresh ginger and its product that contribute to scavenge free radicals. Furthermore, the result also indicatethat dehydrozingerone have the potentiality to be a new antioxidant additive.

Key words: zingerone, dehydrozingerone, gingerol oxime, SARF, DPPH, ginger