be connected to an automatic amino acid analyzer to conduct synchronized operation as shown in fig4 the hydrolysis device shown in fig3 is transported through undergoes four stage operation a sample holder 6 shown in fig3 is transported through the respective steps according to a cascade system n 2 gas acid mixture vapor and 0 01m hcl are introduced into the sample holder 6 through respective valves the sample in the sample holder 6 shown in fig3 is prepared previously by adsorbing a protein in the form of its solution on glass or heat resistant resin beads or porous products 7 in the sample holder to form a substantial monomolecular thin film and drying the same the capacity of the sample holder 6 is 100 u03bcl the sample holder 6 is placed automatically in the gas phase solid phase hydrolysis device and transported automatically from stage 1 to stage 4 successively as shown in fig4 the sample holder 6 into which n 2 gas has been introduced in the first stage 1 is transported to the second stage 2 and heated to 160 u00b0 c by means of a heater 8 a gaseous mixture of tfa hydrochloric acid and water from a vessel 9 heated with a heater 10 is charged by.