Abstract: The effects of extraction temperature, extraction pressure, extraction time and the dosage of modifier on the extraction of nagringenin from peach leaf by supercritical CO₂extraction technology have been studied in this article. By the experiment, the optimization conditions have been confirmed as: extraction temperature 60℃, extraction pressure 30MPa, extraction time 6h and the ratio of peach leaf mass and ethanol mass 1:2.0 (the modifier is 95% ethanol).

Key words: supercritical CO₂, peach leaf, nagringenin