There are many antixoidants in curcuminoids, such as curcumin, demethoxycurcumin and bisdemethoxycurcumin. Based on orthogonal experiments, the effects of extraction temperature, volume fraction of ethanol, extraction time and solidliquid ratio on yield of curcuminoids, scavenging rates of DPPH. and · OH have been investigated by multi-indexes comprehensive method. The optimum conditions are as follows: extraction temperature 80 ℃, volume fraction of ethanol 90 %, extraction time 1.5 h and solid-liquid ratio 1 : 8. Under the conditions, the...