Fig. 10. Fluorescence quenching spectra of octamer DNA–EtBr (A–D) and CT DNA–EtBr (E–H) upon addition of baicalein, chrysin and flavone (0–50 μm) respectively and Stern–Volmer quenching plot of flavones. The DNA–EtBr complex was excited at 476 nm and emission spectra were recorded from 500 to 750 nm.