Optimization of Ultrasonic-assisted Extraction of Polyphenols from Corn Silk by Response Surface Methodology

In order to optimize the technology for the extraction of polyphenols from corn silk,the extraction amount of polyphenols was taken as index to analyze the effects of solvent-to-solid ratio,ultrasonic extraction temperature and time on the extraction amount of polyphenols.Moreover,on the basis of single-factor test,response surface methodology was used to optimize the technology for the ultrasonic-assisted extraction of polyphenols from corn silk.The results showed that the optimum ultrasonic-assisted extraction condition was solvent-to-solid ratio of 34∶1,extraction temperature of 75 ℃,and extraction time of 50 min.The yield of corn silk polyphenols was 174.07 mg/g under the optimum extraction condition.