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ABSTRACTThe by‐products of silver carp (Hypophthalmichthys molitrix) filleting were hydrolyzed to extract protein to reduce the environmental problems caused by the wastes from filleting and to increase the economical values of silver carp processing. Enzymatic hydrolysis of silver carp by‐products from filleting and subsequent mechanism research of bitterness reduction in hydrolysate were performed in this paper. First, the effects of various enzymatic treatments with neutral protease, papain, protamex, Flavourzyme, neutrase and papain combination (NPC) and neutrase and flavourzyme combination (NFC) protease on the degree of hydrolysis (DH), the degree of solubilization of protein and the bitter taste value were compared; the NFC was found to be the best. Second, on the basis of orthogonal tests, the optimal hydrolysis condition was done with 0.5% of the NFC at pH 7.5 and 50C. Finally, the effects of two pretreatments including heating and fat removing on DH were investigated. Results showed that these two pretreatments were not beneficial to enzymatic hydrolysis of silver carp by‐products....
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