Yield of total flavonoids from corn silk (mg/g) by extraction: A, for different durations with the material ratio (the weight of corn silk to the volume of 60% ethanol: g/mL) of 1:30 at 80°C; B, at different temperature with the material of 1:30 for 3 h; C, with different material ratio at 80°C for 3 h; D, for different ethanol concentration with material ratio of 1:30 for 3 h at 80°C. Experiments were repeated at least three times with similar results.