Objective To investigate the effect of bleaching agent hydrogen peroxide and alkali on anthocyanidin in pistachio and the necessity of bleaching techniques.Methods High performance liquid chromatography(HPLC) with diode array detector(DAD) was used to determinate the content of cyanidin-3-O-glucoside and cyanidin-3-O-galactoside in pistachio.The appearances of hard shell,kernel skin and kernel of raw,natural and bleached pistachio were compared.Results Anthocyanidins were rather sensitive to hyd...