Abstract: The impact of microwave extraction technique on papain hydrolyzing grass carp scale is investigated.Under certain conditions of microwave power and microwave radiation time,how enzyme dosage,substrate concentration,enzyme temperature and time influence degree of hydrolysis is discussed.The best extraction process conditions are determined by preferable level of factor which is decided by univariate test as well as orthogonal experiment.The results show that the best technological conditions of enzyme hydolyzing grass carp scale are:papain dosage,5 g/L,substrate concentration,20%,enzyme temperature,60 ℃,enzyme time,1 hour when microwave power is 400 W and microwave radiation time is 60 s.

Key words: Microwave-Assisted, enzyme hydrolization, scale, papain