Ultrasonic-Assisted Extraction and Antibacterial Properties of Polyphenols of Sweet Corncob

This paper reported the extraction conditions of polyphenols compounds by ultrasonic wave and its bacteriostasis from sweet corncob. The yield of Polyphenol was selected as the index which determined by the Folin-Ciocalteu assay, single factor experiment and orthogonal experiment of ultrasound power, the extraction time, the methanol concentration (volume fraction) and solid-liquid ratio had been taken out. The result of orthogonal experiment showed that the best ultrasound power, the extraction time, the methanol concentration (volume fraction) and solid-liquid ratio were 520W, 20min, 1:10 (g/mL) and 80%, respectively. Calculation showed that the yield of Polyphenols up to 2.85%.The extract of Polyphenols from sweet corncob showed that it had bacteriostasis to EscherichiaColi,BacillusSubtilisandStaphylococcusAlbus.