The total flavone in antioxidant substance extracted from leaves of tartary buckwheat and its scaveninging function to ·OH and O~-_2· were determined by photometry and the inhibitory action to Lipin peroxidation and its synergy with other substances were studied by iodimetry in the experiment.The results showed that the content of total flavone in tartary buckwheat amounted to 57 g/kg;the extraction had powerful antioxidation and could delay the peroxidization of oil lipid significantly;with concentration i...