Study on Extraction Process of the Total Flavonoids from Rosmarinus officinalis L.

The best extraction process of total flavonoids from Rosmarinus officinalis L. was studied. The factors that affect the extraction ratio were investigated by single factor and orthogonal experiments, including the concentration of solvent, the liquid-to-solid ratio, extraction time and extraction temperature. The results showed that the optimum conditions were as follows: ethanol concentration was 50 %, solid-liquid ratio was 1 ∶ 20(g/mL),extraction time was 4 h and temperature was 90 ℃. Under the optimum conditions the extraction yield was 6.31 %.