Feruloylated oligosaccharides（FOs） were prepared by the hydrolysis of maize bran in dilute hydrochloric acid,and the component F-Ara was obtained by means of D301 macroporous resin chromatography and poly-amide resin purification from FOs.Then,the purity and structure of F-Ara were analyzed,and the capability of F-Ara for ·OH scavenging in vitro was compared with that of ferulic acid（FA）.The results show that（1） the purity of F-Ara approaches HPLC-purity level after the two above-mentioned resin separation processes;（2） at low concentration（2～6mmol/L）,F-Ara is similar to FA in terms of ·OH scavenging in vitro,while at high concentration（6～10mmol/L）,it is more efficient than FA;and（3） at the concentration of 10 mmol/L,the percentage of scavenging ·OH by F-Ara reaches 72.9%,while that of FA is only 62.4%.Thus,it is concluded that F-Ara is a natural and efficient free radical scavenger.