| Taking Capillary artemisia in Shaanxi as raw material, with ethanol volume fraction, reflux time, reflux temperature and solid-liquid ratio as factors, and flavonoids yield as index, the extraction of flavonoids from Capillary artemisia was studied by ultrasonic pretreatment-ethanol reflux method. The antioxidant activity of Capillary artemisia flavonoids was determined by studying the anti-lipid peroxidation ability and scavenging DPPH free radical ability. The results showed that the optimal extraction conditions of flavonoids from Capillary artemisia were obtained as follows: ethanol volume fraction 50%, reflux time 50 min, reflux temperature 90?℃ and solid-liquid ratio 1∶?25. Under these conditions, flavonoids yield was 2.35%. Temperature, Na+, K+, Ca2+ and Cu2+ had little effect on the antioxidant ability of Capillary artemisia flavonoids. Light illumination, pH, Cd3+, Cr3+ and Al3+ had significant effect on the antioxidant ability of Capillary artemisia flavonoids. In addition, Capillary artemisia flavonoids had certain antioxidant capacity on rapeseed oil, and vitamin C and citric acid exhibited a synergistic antioxidation effect. |
