Abstract
The study aims to determine the extraction parameters for maximal phenolic compounds and antioxidant activity from kiwifruit by using response surface methodology (RSM). Box-Behnken experimental design of RSM was applied to determine the effect of extraction parameters. Three independent variables were selected at three levels: methanol concentration (A: 60-75-90 %), ultrasound time (B: 5-10-15 min.), and mass of sample (C: 1-2-3 g). Conditions for maximum phenolic yield were found as A = 90%, B= 7.71 min, and C = 3 g, under this condition, DPPH of 88.96 %, ABTS of 739.07 mg/100g FW and TPC of 299.14 mg/100g fresh weight has been obtained.