FOOD SCIENCE ›› 2012, Vol. 33 ›› Issue (18): 127-132.

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Optimization of Microwave-Assisted Extraction of Flavonoids from Propolis by Response Surface Methodology

  

  • Received:2011-07-18 Revised:2012-07-31 Online:2012-09-25 Published:2012-09-07

Abstract: This paper reports the optimization of process conditions for microwave-assisted extraction of flavonoids from propolis using response surface methodology. The effects of six operating parameters including microwave treatment time, microwave power, solvent composition (ethanol concentration), temperature, time and solvent-to-solid on total flavonoid yield were investigated through one-factor-at-a-time experiments. The significance and interaction effects of microwave treatment time, microwave power, ethanol concentration and temperature were analyzed by response surface analysis based on a three-level central composite design. The optimal microwave-assisted extraction conditions for total flavonoids were determined as follows: 70 s microwave treatment at 282 W followed by extraction with 80% ethanol aqueous solution at a solvent-to-solid of 25 mL/g and 77 ℃ for 12 h. Under these conditions, the yield of total flavonoids from propolis was up to 25.08%.

Key words: propolis, flavonoids, extraction, response surface methodology