Ultrasonic-assisted extraction and antioxidant activity of honeycomb flavonoids

Ultrasonic technology was applied to the extraction of honeycomb flavonoids firstly in this paper.By single factor and orthogonal experiments,the critical process parameters were optimized and obtained:ultrasonic time 15 min,solid-liquid ratio 1:100(g/mL),ultrasonic power 900 W.Under the optimal conditions,the yield of flavonoids was 0.540%,which was significantly higher than conventional refluxing method(0.322%).Evaluated by DPPH and FRAP methods,the DPPH radical scavenging rate and FeSO4.7H2O equivalent of honeycomb flavonoids extracts were 35.3% and 2556.7 mmol/g,respectively.These resluts indicated that the honeycomb flavonoids possessed higher antioxidant activity,and had greater development potential and application value.