Abstract: The four natural edible flavonoid pigmets were studide by DPPH. The results indicated that they all have had the antioxidant activities and some of them were the same as BHT. The analyses from ultraviolet spectrum and contents of the flavonoid confirmed the close relationship between the antioxidant activities of the four pigments and the contents and structures of the flavonoid. The present study provided the scientific basis for further developing the application of natural edible flavonoid pigments.

Key words: Flavonoid DPPH Antioxidant activity BHT U1travioletspectrum