چکیده (انگلیسی):

Extract methodology of total flavonoids from ginger and hydroxyl radicals scavenging effect, were researched in this paper. Methanol concentration, solid-liquid ratio, extraction temperature and time were determined as four single-factor in the experiment. The central points of Box-Benhnken design were selected according to the experimental results of single-factor experiment, the extract process was further optimized by RSM and BBD. The optimum extract conditions were methanol concentration of 60%, solid-liquid ratio of 3:30 (g:mL), extraction temperature of 60°C and time of 3 h, The maximum experimental extraction ratio was 0.497% by RSM. The experimental extraction ratio matched well with the theoretical value of 0.538% by solving the multiple regression equation. RSM has been proved to be an effective technique for optimization of extraction process and the fitted quadratic model has a predictive effect on target extracts. The scavenging effect of ginger extracts, BHT and L-ascorbic acid on•OH with the same concentration were sorted by L-ascorbic acid > ginger extract > BHT, and all the three antioxidant regents displayed a significant dose-effect relationship.