Study on the extraction and anti-oxidative activities of yellow pigment with microwave-assisted extraction from Hanzhong rapeseed flowers

The pigment was extracted from rapeseed flowers by microwave-assisted extraction technology. On the basis of single-factor experiments, the optimal operating conditions were obtained with orthogonal design.The optimum extraction conditions was established as follows:the concentration of ethanol 95%, extracted 30 s with microwave radiation, the reflux time was 15 min, the reaction temperature was 80℃ and the ratio of material to liquid 1∶40. The yellow pigment could inhibit the oxidant degree of the edible oil. The capacity to scavenge hydroxyl free radical and H2O2 increased as well as the concentration within a certain degree.