In comparison with heating-only treatment (control), the total extractable phenolic contents in oat flour were highly significantly(p < 0.001) increased when treated with amylase (Fig. 1). Alphaamylase was able to hydrolyze a-1, 4-glycosidic bonds in starch to form maltose, the ester linkage between phenolic acids and the attached sugar was hydrolyzed, and more phenolic compounds