Abstract: By single factor test,the technology conditions for defatting lobster processing wastes are determined as follows: cyclohexane alkyl as defatting solvent,temperature 60℃,time 60 min,and ratio of liquid to solid 5:1. By single factor and orthogonal tests,the optimal conditions of ultrasonic-assisted alkaline extraction of protein from the defatted lobster processing wastes are determined as follows: treatment time of ultrasonic 10 min,alkali lye concentration 0.8%,extraction temperature 70℃,extraction time 30 min,and ratio of material to liquid 5: 1. Under these conditions,the protein extraction rate is 78.6%.

Key words: lobster processing wastes, alkali extraction, ultrasonic, lobster protein powder