Abstract: The present invention provides a process for producing fine particles of a salt, hydroxide or oxide, wherein when producing the salt, hydroxide or oxide by electrodialysis using anion exchange membranes and cation exchange membranes, a conductive liquid acting as a poor solvent for the salt, hydroxide or oxide which is produced in a concentration chamber is used as a concentration chamber solution, as well as the fine particles of the salt, hydroxide or oxide which are produced by the above process.

Abstract: A method of manufacturing an aqueous solution of biocompounds containing peptide as a major component and a hydroxyapatite containing minerals and being useful an inorganic or organic composite material from tissue in an electrolytic cell by performing the electrolysis of an aqueous solution of the tissue and by taking advantage of an electrode reaction using suitable electrodes. In this case, a DC current is passed between the electrodes in the aqueous solution, thereby dissolving and crystallizing the tissue components. After unreacted matters are removed, the resultant mixed solution is separated into solid matters and a liquid. The aqueous solution of biocompounds is obtained from the filtrate, and the hydroxyapatite is obtained from the recrystallized solid matters.