Abstract:Single factor and orthogonal array design experiments were used to optimize the ultrasonic extraction conditions of polyphenol from sweet corncobs. The total polyphenol content was determined by the Folin-Ciocalteu assay. Results showed that the optimum extraction conditions were as follows: 45 min ultrasonic treatment at 200W power for extracting the raw material with a 15-fold volume of 80% aqueous ethanol solution at 40 ℃. The yield of polyphenol was (2.61±0.09)%, under the optimum condition, and DPPH radical scavenging activity under this condition reached (70.05±0.17)%.
