Patent ID: 8337933

Claim:
A method of preparing oyster flesh extracts, comprising: a first extraction step of placing raw oyster flesh in an extractor with a first extraction solution stored therein, and putting said raw oyster flesh in a normal pressure state of 1 atm in said extractor to extract a first portion of oyster flesh extracts from said raw oyster flesh, and feeding said first portion of oyster flesh extracts into said first extraction solution, a first concentration step of concentrating said first extraction solution with said first portion of oyster flesh extracts fed therein under a reduced pressure in a vessel and evaporating the water content at a temperature lower than 60° C., to produce a first concentrated solution, a first precipitation step of adding a first alcohol solution to said first concentrated solution to precipitate out said first portion of oyster flesh extracts, a first formation step of drying precipitates obtained in said first precipitation step into dry oyster flesh extracts, a second extraction step of again placing said raw oyster flesh used in said first extraction step in said extractor with a second extraction solution stored therein, pressurizing said raw oyster flesh to 0.1 atm and 0.2 atm in said extractor for 30 to 70 minutes to extract a second portion of oyster flesh extracts from said raw oyster flesh in a pressurized state, and feeding said second portion of oyster flesh extracts in said second extraction solution, a second concentration step of concentrating said second extraction solution with said second portion of oyster flesh extracts fed therein to produce a second concentrated solution, in said second extraction step putting the second extraction solution under a reduced pressure in the vessel and evaporating the water content while at a temperature lower than 60° C., a second precipitation step of adding a second alcohol solution to said second concentrated solution to precipitate out said second portion of oyster flesh extracts, and a second formation step of drying precipitates obtained in said second precipitation step into dry oyster flesh extracts.