Abstract: Proanthocyandins were ultrasonically extracted from “Black Beauty” potatoes and further separated by AB-8 macroporous resin.The concentration of proanthocyandins in the purified extract was 93.59%,and the yield of proanthocyandins was determined to be 4.3%.Proanthocyandins of “Black Beauty” potatoes had strong scavenging effects against DPPH radicals,·OH radicals and O₂^-·radicals.The scavenging rates of proanthocyandins were positively related to its concentration,and did not lower than that of Vc.The scavenging effects against ·OH radicals and O₂^-· radicals were obviously higher than that of Vc.This study provided theoretical basis for further development and utilization to proanthocyanidins from “Black Beauty” potatoes.

Key words: “Black Beauty&rdquo, potatoes;proanthocyanidins;antioxidant activity