Abstract: The co-crystallizing and co-melting temperatures of Stichopus japonicus are determined as -15℃ and -13℃ respectively by electrical resistance method. Based on them,The freeze-drying technology of Stichopus japonicus is determined as follows: prefreezing the Stichopus japonicus of 12 to 15 mm thickness for 1h at -34℃,then increasing temperature to -25℃ and keeping for 42 to 48 h,and then rising the temperature to 25℃ and keeping for 6 h. The moisture content of the freeze-dried product is less 10%. The rehydration ratio is about 35%,and the weight gain rate is 60% to 65%. According to determina-tion results by texture analyzer,the hardness,adhesiveness,chewing and gumminess decline,but the springiness rises,and cohesiveness and resilience are almost invariant.

Key words: Stichopus japonicu, sco-crystallizing point, co-melting point, freeze-drying, texture analysis