Extraction-precipitation methods used in separation of terminalia-polyphenols and structures of terminalia-polyphenols by IR spectra.Scavenging effects of terminalia on active oxygen species·OH and O2-· generated by Fenton reaction and riboflavine photosensitization in vitro were investigated by the means of spectrophotometry.The inhibition effects of terminalia on the lecithin lipid peroxidation and oxidation damage of DNA chain induced by hydroxyl radical were observed by thiobarbit uric acid spectrophoto...