【Objective】This study focused on the optimum extraction process of melanin from brown frog eggs by acid hydrolysis and its antioxidant activities.【Method】Using brown frog eggs as material,the effects of hydrochloric acid concentration,material to liquid ratio,hydrolysis temperature and hydrolysis duration were studied through single factor experiments and orthogonal test and the optimum hydrolysis process was determined.The scavenging activities on DPPH,hydroxyl free radical and O-·2of extracted melanin wer...