Method for producing frozen fresh plant/animal or portion

Abstract

A method for producing frozen fresh plants/animals or portions thereof includes the steps of: producing an ice slurry by mixing ice generated by freezing salt water having a salt concentration of from 13. 6% to 23 .1% and salt water having a salt concentration of from 13. 6% to 23.1%, and instantaneously freezing fresh plants/animals or portions thereof by immersing the fresh plants/animals or portions thereof in the ice slurry.

1 . A method for producing frozen fresh plants/animals or portions thereof, the method comprising:
 a step of producing an ice slurry by mixing ice generated by freezing salt water having a salt concentration of from 13. 6% to 23 .1% and salt water having a salt concentration of from 13. 6% to 23.1%, and   a step of instantaneously freezing fresh plants/animals or portions thereof by immersing the fresh plants/animals or portions thereof in the ice slurry.   
     
     
         2 . The method according to  claim 1 , wherein the ice is ice which satisfies the following conditions (a) and (b) and is from a liquid that includes an aqueous solution including a solute:
 (a) a temperature of the ice after melting completely is lower than −5° C.; and   (b) a rate of change of solute concentration in an aqueous solution to be generated from the ice in melting process is 30% or less.   
     
     
         3 . The method according to  claim 2 , wherein the solute includes two or more kinds of solutes having different degrees of solidifying point depression. 
     
     
         4 . The method according to  claim 1 , wherein salt concentrations in the ice and the salt water to be mixed are about the same. 
     
     
         5 . The method according to  claim 1 , wherein a mass ratio between the ice and the salt water to be mixed is ice:salt water=75:25 to 20:80. 
     
     
         6 . The method according to  claim 1 , wherein the instantaneously frozen fresh plants/animals or portions thereof are taken out from the ice slurry and the fresh plants/animals or portions thereof are cryopreserved at a temperature equal to or lower than the temperature at the time of instantaneous freezing. 
     
     
         7 . The method according to  claim 1 , wherein a solid having a higher thermal conductivity than the ice is interposed between the ice and the fresh plants/animals or portions thereof in the instantaneous freezing step.