Journal of Tianjin Agricultural University ›› 2017, Vol. 24 ›› Issue (2): 63-66.

• Researches and Scientific Notes • Previous Articles     Next Articles

Optimization of Ultrasonic-assisted Extraction Technology and Antioxidant Activities of Flavonoids in Radish Leaves

WU Hai-qing1,2, ZHEN Run-ying1,2,Corresponding Author, HE Xin-yi1,2, SUN Gui-bao1,2   

  1. 1. College of Food Science and Biotechnology, Tianjin Agricultural University, Tianjin 300384, China;
    2. Tianjin Engineering and Technology Research Center of Agricultural Products Processing, Tianjin 300384, China
  • Received:2016-07-10 Online:2017-06-30 Published:2019-10-15

Abstract: Total flavonoids were extracted from radish leaves using ethanol as extraction solvent with the aid of ultrasonic treatment. Five single-factor experiments with four factors triple orthogonal design was adopted to research the ultrasonic-assisted ethanol extraction process of flavonoids in the water bath. The scavenging abilities against hydroxyl radicals (·OH) and (O2-·) in vitro of flavonoids were determined. The results indicated that the optimum extraction parameters were as follows:the volum fraction of ethanol was 60%, solid-liquid ratio was 15(m:V), ultrasonic treatment 15min, immerse 30 min under the temperature of 50 ℃. Under these conditions, the extraction rate of total flavonoids is up to 1.41%, was the traditional extraction method of 200%. Flavonoids of radish leaves can effectively scavenge·OH and O2-·, and the role of these effect increased with the increase of flavonoids concentration, IC50 were 0.643 8, 1.523 1 mg/mL. These results demonstrated that UAE was a highly effective way to extract flavonoids from radish leaves and the antioxidant activity of flavonoids was high.

Key words: radish leaves, flavonoids, ultrasonic wave, assisted, antioxidant

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